Hypertech POWER PROGRAMMER III Step By Step Installation Instructions

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HYPERTECH

POWER PROGRAMMER III

™

FOR GM VEHICLES WITH

4.3/4.8/5.3/6.0/8.1L VORTEC ENGINES

STEP-BY-STEP INSTALLATION

INSTRUCTIONS

PP4

OnStar

Equipped Vehicles

See Pages 4-6

BEFORE

Programming

Part #761

5.1.05

Page 2

TABLE OF CONTENTS

Important Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

Section 1: OnStar Equipped Vehicles . . . . . . . . . . . . . . . . . .4

Section 2: PowerStat

™

Installation for 4.8/5.3/6.0L . . . . . . . .7

Section 3: Programming Instructions . . . . . . . . . . . . . . . . . . .9

Diagnostic Trouble Code (DTC) Information .

10-11

Engine Tuning . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Rev Limiter . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Top-Speed Limiter . . . . . . . . . . . . . . . . . . . . . . . 13

Tire Size . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Rear Gear Ratio . . . . . . . . . . . . . . . . . . . . . . . . . 14

Transmission . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Transmission Shift Point MPH & RPM . . . . . . 15

Transmission Shift Firmness . . . . . . . . . . . . . . . .18

Report . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Programming . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Section 4: Programming Back-To-Stock/Changing Options 20

Section 5: Troubleshooting Guide . . . . . . . . . . . . . . . . . . . . 21

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IMPORTANT

• The Power Programmer for 1999-2005 4.3/4.8/5.3/6.0/8.1L GM trucks and SUVs is legal

for California pollution-controlled motor vehicles

according

to the CARB Executive Order process. In the interest of improved air quality, the California Air Resources Board (CARB) requires new vehicle and manufacturers of aftermarket parts to develop engine and emissions equipment that either reduce or maintain specific air pollutants affected by vehicle use. Both the California Vehicle Code (section 27156) and Federal Clean Air Act (administered by the Environmental Protection Agency) prohibit modifications that increase vehicle emissions. Aftermarket parts manufacturers, particularly in the high-performance

segment, are required to obtain CARB approval in

the form of executive

Orders (E.O.s) for any product not qualifying as a

direct replacement for an original equipment part. Hypertech includes

meeting all E.O. requirements in its product development process. This guarantees

that users of Hypertech “Power Tuning” products will

meet certification

requirements when registering, selling, or needing to pass various emissions tests or Inspection and Maintenance (I&M) programs administered by state or local enforcement agencies. Make sure that any emissions-related product you buy and install carries an E.O. number or is pending an E.O. Without this verification you are at

risk, in potential violation of regulations

and may incur unnecessary

financial obligations during vehicle

inspections or emissions tests. A CARB E.O. sticker is supplied. Keep

this sticker in your vehicle or attach it inside the door jam as proof that the Power Programmer is street legal.

• Your vehicle’s computer will not be programmed at the end of the programming menus until you select “PRESS ‘Y’ TO

BEGIN

PROGRAMMING”, on page 18. Feel free to experiment

with the

programming choices without the fear of accidentally

programming

the wrong information into your vehicle’s computer.

You can make any choice that you want and change it again and again, without programming it into your vehicle’s computer, until you are absolutely ready.

• While the programmer is programming:

* DO NOT leave the vehicle while programming is in process.

* DO NOT program your vehicle without a fully charged battery.

If after you have programmed your vehicle’s computer with the Hypertech Power Programmer and you decide to change the tuning, It is r

ecommended that you recharge your vehicle’s battery. You may either drive the vehicle to charge the battery or use a battery charger. But either way, MAKE sure that the battery holds a full charge.

* DO NOT disturb the cable while programming.

* The ONLY time you may remove the programmer cable from

the DLC safely is PRIOR

to pressing ‘Y’ to program your entries. However, any programming choices you have made WILL

NOT

be saved. NOTE: It is NOT safe to unplug the

programmer cable any time AFTER

you have pressed ‘Y’ to

program.

* DO NOT turn the key off UNLESS

instructed by the programmer.

* DO NOT start the engine.

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Any of these actions will interrupt the programming process. The programmer is designed to recover from these conditions, but they should be avoided.

HYPERTECH POWER PROGRAMMER III

INSTALLATION INSTRUCTIONS OVERVIEW

Congratulations! You are the owner of the Power Programmer III,

the latest in high-performance tuning technology. Now you can optimize your engine’s tuning, as well as adjust other vehicle parameters (see table of contents), all at the touch of a button.

Your vehicle has an onboard computer that controls the engine

and transmission. Inside your vehicle’s computer is a FLASH memory chip which contains the vehicle’s programming. The programmer actually reprograms this FLASH computer chip, according to your specifications, with Hypertech’s Power Tuning. This is the only way an individual can reprogram some 1994-1995 and all 1996 and newer vehicles sold in the United States.

To reprogram your vehicle’s computer, simply plug the

programmer cable into the vehicle’s diagnostic connector located under the dash panel on the driver’s side. Set the parking brake. Next, turn the ignition key to RUN but do not start the engine. Press the ▲ arrow on the programmer. It will then identify your vehicle and display a series of options on its screen. When completed, turn the key to OFF and disconnect the cable from the diagnostic connector. Now you’re ready to

Feel the Power!

Hypertech’s Power Tuning can be stored in only one (1)

vehicle at a time. The Power Programmer can be reconnected to remove the Power Tuning and return the vehicle to the factory programming at any time. After you have performed this step, your vehicle will be in its stock configuration.

You may also reconnect your programmer at any time to change

the programming. For example, if you have replaced your factory tires with different diameter tires, you will want to correct your speedometer, odometer, and automatic transmission shift points. Simply reconnect your programmer, answer the necessary option(s), and reprogram your vehicle. You do not have to return to stock first.

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SECTION 1: ONSTAR EQUIPPED VEHICLES

If your GM vehicle is equipped with the OnStar system, you

MUST

temporarily disable the system BEFORE programming

your vehicle with the Power Programmer III. Please follow the steps below to temporarily disable the OnStar system.

General Precautions

Many new vehicles are equipped with daytime running lights, or sensors that turn the headlights on in dim situations automatically when the ignition is on. For the purposes of programming the vehicle this presents an unnecessary extra drain on the vehicle battery. Many new vehicles have a procedure for turning off the lights. Often this is accomplished by pressing the “Dome Override” button two (2) to four (4) times in succession.

We recommend that your headlights be off when programming your vehicle for added safety against corrupt programming due to battery failure. See your owner’s manual for vehicle specific information regarding your headlights.

Recommended Precautions

The OnStar system by GM periodically communicates with the vehicle. This periodic communication with the vehicle has been known to disrupt the programming process. In order to

prevent

disruption of the programming process, it is recommended

that the OnStar system be disabled while programming the vehicle. To temporarily disable your OnStar system in 4.8/5.3/6.0/8.1L GM vehicles, remove the fuse(s) associated with OnStar. Please refer to the fuse section of your owner’s manual for instructions and locations of fuse(s).

The fuse panel will be under the hood of

the vehicle on the driver’s

side behind the battery. In most cases there will be one (1) fuse in that fuse panel the OnStar system relies on. See page 5 for an example. For 4.3L GM SUVs, follow the steps on page 6 to temporarily disable the OnStar system.

When the OnStar system is successfully disabled, its indicator light on the dash or rearview mirror will be OFF. Be sure that this light is off when the key is in the ON position (engine not running) BEFORE

programming the vehicle. This will ensure

that there are no OnStar related problems.

Recovery From OnStar Related Power Programmer Hang-up

If the programmer stops programming

for an extended period of time, perform the following steps to recover and/or continue programming (see next page):

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INFO

SBA

RADIO AMP

TREC

SEO B1RADIO

EAP

W/S WASH

CRANK

BTSI

A/C COMP

RR WPR

The fuse panel is located on the driver’s side of the vehicle behind the vehicle battery. Lift off the cover to access the fuse block. You now can remove the fuse. To remove the fuse, hold the end of the fuse between your thumb and index finger and pull straight out. Make sure you remember

to re-install the fuse in the proper location and re-install the fuse panel cover after programming your vehicle.

Fuse panel

cover

For All 4.8/5.3/6.0/8.1L GM vehicles

TBC

HAZ LP

RR WPR

RDO AMP

CIGAR

HTD MIR

SEO 2

RADIO

CTSY LP

IGN C

FOG LP

BTSI

FOG LP

AUX PWR

A/C

HORN

W/W PMP

DRL

SEO 1

1999-2002 GM vehicle fuse diagram

** Do Not Turn The Ignition Key Off **

1. Disconnect the programmer from the vehicle.

2. Reconnect the programmer to the vehicle.

3. Press the START button on the programmer.

The programmer will resume communications with the vehicle where it left off. If the programmer fails to re-establish communications with the vehicle, repeat the procedure. If the programmer still fails to resume, disconnect the programmer and turn the vehicle off. Attempt to start your vehicle. If your vehicle fails to start, the vehicle computer may have been corrupted, and you will need to send your vehicle computer and programmer to Hypertech for repair. If the vehicle starts, you will need to return your programmer to Hypertech for re-initialization, no harm was done to the vehicle computer.

For 1999-2002 vehicles, the one (1) fuse that must be removed is as follows: (see highlighted fuse location above.)

Location

Description

SEO1 Special Equipment Option, OnStar

For 2003-2005 vehicles, the one (1) fuse that must be removed is as follows: (see highlighted fuse location below.)

Location INFO

Description OnStar

NOTE:Owner’s manual fuse diagram may vary from examples shown.

2003-2005 GM vehicle fuse diagram

(Illustration does not represent entire fuse diagram)

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NOTE for 1999-2002 GM vehicles: If the previous step did not

turn off the OnStar light on the dash, follow these

steps to remove three (3) other OnStar related fuses:

The three (3) fuses that must be removed are as follows: (see highlighted fuse locations to the right.)

Location Description

SEO IGN Special Equipment

Option, Ignition, OnStar

RDO 1 Audio System,

OnStar

RAP #2

Rear Power Windows, Sunroof, Radio, OnStar

NOTE: Owner’s manual fuse diagram may vary from example shown.

Disabling OnStar in 4.3L GM SUVs

To temporarily disable the OnStar system in 4.3L GM SUVs, the plug to the OnStar computer must be disconnected. The OnStar computer is located in the back of the vehicle under the passenger’s side rear interior cover (See Figure A). To remove the cover, release the clip and swing out. See Figure B. Squeeze the blue and grey tabs on the connector and pull up to temporarily disconnect the OnStar system in the vehicle.

What To Do After Programming Your Vehicle

After the vehicle computer has been successfully programmed, reinstall the fuse(s) removed that are OnStar related to enable the system for 4.8/5.3/6.0/8.1L vehicles, making sur

e the proper amperage fuse is in each location and the fuse panel cover(s) arereinstalled. For 4.3L GM vehicles, plug the OnStar connector

back to the original location and reinstall the interior cover.

Figure A

Figure B

OnStar

computer

OnStar

connector

➚

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SECTION 2: POWERSTAT INSTALLATION

For 1999-2003 4.8/5.3/6.0L GM vehicles

Tools needed:

10mm socket, ratchet, and extension Slip joint pliers DEX-COOL anti-freeze coolant

NOTE: The thermostat in this engine is a “housing” style

thermostat. It is located on the front of the water pump assembly at the bottom edge of the passenger side cylinder head. (See Figure C)

Part #1015 - 180° PowerStat (1999-2003 ONLY)

1. Make sure that the vehicle is parked on a level surface before installing the Hypertech PowerStat.

2. Allow the vehicle coolant to cool.

3. Turn the surge tank cap counter-clockwise very slowly to remove the pressure from the cooling system. If you hear a hissing or spurting sound, stop and let the pressure bleed off. When the hissing or spurting sound goes away, finish removing the surge tank cap.

4. Open the radiator drain plug and drain the coolant from the vehicle.

5. Remove the radiator hose from the stock thermostat.

6. Remove the two (2) 10mm bolts holding the stock thermostat to the engine. (You may want to use an extension on the socket wrench for easier access.)

7. Lift out the stock thermostat. Use a flathead screwdriver to gently pry, if necessary. Clean all the sealing surfaces.

8. Install the Hypertech PowerStat, making sure the O Ring is sealed properly. For ease of installation, you may want to apply a small amount of grease to the PowerStat to help retain the O Ring.

NOTE: After installing the PowerStat, if any coolant needs to be added to the vehicle,

make sure you put the same color coolant back into the vehicle. If your vehicle

has orange coolant, replace with orange coolant. If green, replace with green.

To complete your performance package, you may choose to use a low-temp thermostat. Replacing the factory thermostat with a Hypertech PowerStat will allow the engine to run cooler, increasing power, and reducing the engine’s tendency to detonate.

• For 4.3 & 8.1L vehicles, Hypertech recommends using

the stock

thermostat. For 1999-2003 4.8/5.3/6.0L vehicles,

Hypertech recommends

using the 180° PowerStat. The

PowerStat is NOT available for 2004-2005 GM trucks/SUVs.

• WARNING: Never attempt to change a

thermostat on a hot engine.

• Serious injury can occur if the radiator cap

is removed while the cooling system is hot.

• The engine should always be cold when

installing the Powerstat.

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9. Reinstall the thermostat bolts and any hoses removed. Torque the bolts to 7 ft.-lbs.

10. Close the radiator drain plug.

11. Fill the cooling system with the proper water/coolant mixture. Refer to the owners manual for the correct ratio. Pour the coolant into the surge tank.

12. Start the engine and let it idle for approximately one (1) minute.

13. Reinstall the surge tank cap.14. Cycle the engine from idle to 3000 RPM in thirty (30) to forty (40) second intervals. This needs to be done until the engine coolant temperature reaches 210°F or 99°C.

15. When the cooling system is at the proper temperature, shut off the engine. Remove the surge tank cap as described in Step 3.

16. Leaving the surge tank cap off, start the engine and let it idle for one (1) minute. Then, fill the surge tank with the coolant mixture to 1/2” above the “Fill Cold” mark on the surge tank. Now reinstall the surge tank cap.

17. Repeat Step 14 once more, then shut off the engine.

18. Allow the vehicle coolant to cool, then remove the surge tank cap again as described in Step 3. Top off the coolant system to 1/2” above the “Fill Cold” mark on the surge tank, then tighten the surge tank cap.

Figure C

IMPORTANT:

NEVER MIX ORDINARY ANTI-FREEZE (GREEN)

WITH DEX-COOL ANTI-FREEZE (ORANGE)

OR YOU MAY DAMAGE THE COOLING SYSTEM

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SECTION 3: PROGRAMMING INSTRUCTIONS

• Connect one (1) end of the provided cable to the programmer as in Figure D and tighten the two (2) thumbscrews.

• See Figure E. Locate the Data Link Connector (DLC) under the driver’s side of the dash panel above the emergency brake.

• Plug the programmer cable into the DLC. Make sure the cable

is plugged in completely to ensure a good connection.

• Set the parking brake to turn off the DRLs (Day-Light Running Lamps) and turn the ignition key to the RUN position, but do not start the engine.

IMPORTANT:

-DO NOT leave the vehicle while programming is in process.

-Make sure the vehicle battery is fully charged before programming.

-The key must remain in the RUN position, without the engine

running, during the entire programming process.

-DO NOT operate electrical accessories

(radio, windows, wipers, etc.) while programming.

- If the vehicle is equipped with an OnStar system, make sure the system is temporarily disabled (see Section 1 for details).

- DO NOT attempt programming while the vehicle is connected to a battery charger.

Figure D

Programmer

Thumbscrew

Figure E

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• Press the ▲ arrow on the programmer. The following displays

should appear immediately on the LCD screen (where X.X.X.X is the version number):

• If these screens do not appear, make sure that both ends of the

cable are securely attached and press the ▲ arrow again.

• The programmer will show applications and copyright information. The programmer will then identify your vehicle and perform a self-test. A few seconds after the self-test is complete, the VIN number of the vehicle will be shown and a screen should appear with a description

of your vehicle:

• If this screen does not appear, make sure that the key is in the

RUN position with the engine NOT running.

• The programmer will display a series of options. For each

option press the ‘Y’ button to make a change. Press the ‘N’ button to make no change and proceed to the next option. For some options, you will use the ▲ and ▼ arrows to point to a particular option. Pressing the ‘Y’ button will then lock in your selection. This screen will now appear:

• The Power Programmer is checking the vehicle for any

Diagnostic Trouble Codes (DTCs). If no DTCs are found, this screen will appear:

• If no DTCs are found, the Power Programmer will then go

to Step A (Engine Tuning). If any DTCs are found, this screen will appear:

HYPERTECH

POWER PROGRAMMER

VERSION

X.X.X.X

CHECKING FOR DIAGNOSTIC

TROUBLE CODES (DTCS)

NO DTCS REPORTED

“X” DTCS REPORTED

YOUR VEHICLE IS:

XXXX CHEVROLET TRUCK/SUV X.XL

FOR XXXX GMC AND

CHEVROLET TRUCKS

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• “X” represents the number of DTCs found in the vehicle. This screen will now appear:

• Press ‘Y’ to view the DTC(s) found in the vehicle. Press ‘N’ to clear the DTC(s) without viewing them. If you press ‘Y’, these screens will appear:

• Press the ‘N’ button to view the next DTC (if any). Once you have viewed all the DTCs, this screen will appear:

• Press ‘Y’ to view the DTC(s) again. Press ‘N’ to continue. If you press ‘N’, this screen will appear:

• Press ‘N’ to exit the program. This screen will appear:

• Press ‘Y’ for the Power Programmer to clear the DTC(s). These screens will now appear:

VIEW DTCS = Y

CLEAR DTCS = N

DTC #1 --- PXXXX

NEXT DTC = N

NO MORE DTCS, TO VIEW AGAIN, PRESS Y

TO CONTINUE, PRESS N

DTCS MUST BE CLEARED BEFORE CHANGING PROGRAM. TO CLEAR DTCS PRESS Y

TO KEEP DTCS AND EXIT PROGRAM PRESS N

TURNING POWER

PROGRAMMER OFF

CLEARING DTCS

ALL DTCS HAVE

BEEN CLEARED

WRITE DOWN THE FOLLOWING DTCS AND REFER TO

FACTORY MANUALS FOR EXPLANATION

Hypertech, Inc. recommends proper diagnosis and repair of reported DTCs prior

to programming. For Diagnostic Trouble Code (DTC) interpretations, refer to

factory manuals, see your local parts dealer, or visit internet sites

that provide this type of information. An example of such a website is:

www.bentlypublishers.com/tech/vw/dtc.table.htm

IMPORTANT NOTE

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•

The Power Programmer has now successfully cleared the DTC(s) found in the vehicle computer. This screen will now appear:

A. ENGINE TUNING

• Press the ‘Y’ button to install engine tuning. Press ‘N’ to keep the stock vehicle tuning.

•

If you pressed the ‘Y’ button for engine tuning, use the ▲ and ▼ arrows to select between premium octane and regular octane engine tuning. Press ‘Y’ when you have selected the proper tuning for your vehicle (see below for details).

B. REV LIMITER

• Press ‘N’ to keep the stock engine rev limiter. Making this choice will skip to the next option.

• Press ‘Y’ to adjust the engine rev limiter to a value other than stock. The stock rev limiter may vary depending on year and engine size of the vehicle. Please refer to the owner’s manual for the stock engine rev limiter.

• Press the ▲ and ▼ arrows to increase or decrease the engine rev limiter. The rev limiter can be increased or decreased in 100 RPM increments. Press ‘Y’ to lock in the desired value.

NOTE: At any time, you may press ‘N’ to allow you to either

try again or skip to the next option.

TO ENTER POWER PROGRAMMER MODE, PRESS Y

TO EXIT PROGRAM, PRESS N

USE UP/DOWN ARROWS TO CHOOSE FUEL OCTANE THAT WILL BE USED, THEN PRESS Y TO SELECT OR N TO EXIT.

_ _ OCTANE

TO INSTALL HYPERTECH POWER TUNING, PRESS Y

TO KEEP FACTORY ENGINE TUNING, PRESS N

TO ADJUST ENGINE REV LIMITER, PRESS Y

TO KEEP STOCK ENGINE REV LIMIT, PRESS N

USE UP/DOWN ARROWS TO ADJUST ENGINE REV LIMITER, THEN PRESS Y TO SELECT OR N TO EXIT.

_ _ _ _RPM

Do You Know What You’re Pumping Into Your Vehicle?

For purposes of improved air quality, availability of Reformulated gas (RFG) is being required in some parts of the country. Hypertech is including Power Tuning for select vehicles using this gasoline, sometimes called “oxygenated fuel”. We encourage our customers to identify the type of gasoline being used and select the Hypertech Power Tuning accordingly.

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C. TOP-SPEED LIMITER

• Press the ‘N’ button to keep your vehicle’s stock top-speed limiter and skip to the next option.

• If you have installed factory-approved high-performance tires, press the ‘Y’ button to change your vehicle’s top-speed limiter to match the speed rating of those tires. The speed rating or speed symbol will be found on the sidewall of your tires. Here are the corresponding symbols and maximum top-speed limits that can be programmed into your vehicle:

D. TIRE SIZE

• Press ‘N’ if the original size tires are being used.

• Press ‘Y’ if you have installed tires with an overall height that is different than the original factory tires. This feature will allow you to adjust your speedometer and shift points (for automatic transmissions) for the new tire height. The

▲ and ▼

arrows will allow adjustments of 1/4” increments. Maximum and minimum tire height that can be adjusted depend on the year, make, and model of the vehicle. Press the ‘Y’ button to lock in the desired value. At any time you may press ‘N’ to allow you to either try again or skip to the next option.

TO ADJUST TOP SPEED LIMIT TO MATCH SPEED RATING OF HIGH-PERFORMANCE TIRES, PRESS Y

TO KEEP STOCK TOP SPEED LIMIT, PRESS N

USE UP/DOWN ARROWS TO ADJUST TOP SPEED LIMIT, THEN PRESS Y TO SELECT OR N TO EXIT.

_ – –_ _ _ MPH

S - 110 MPH T - 116 MPH

H - 128 MPH

IF TIRE HEIGHT HAS BEEN CHANGED FROM ORIGINAL, PRESS Y

IF TIRE HEIGHT HAS NOT BEEN CHANGED, PRESS N

USE UP/DOWN ARROWS TO CHOOSE CORRECT TIRE HEIGHT, THEN PRESS Y TO SELECT OR N TO EXIT.

_ _._ _”

If you do not know your tire height, ask your tire dealer or measure a tire as follows:

1. Place a chalk mark on the tire where it contacts the pavement and also mark the pavement. These marks should be at the center of the tire footprint pointing straight down to the pavement.

2. Roll the vehicle in a straight line until the chalk mark makes one revolution and is pointing straight down at the pavement again. Mark the pavement again at this new spot.

Measure (in inches) the distance between the two (2) marks on the pavement. Divide the measurement by 3.1416. This will give you the tire height in inches.

IMPORTANT NOTE: If you have an 8.1L GM vehicle, the next option to be shown on the programmer screen after the tire size option will be transmission (Section F).

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E. REAR GEAR RATIO

• Press ‘N’ if the rear gear ratio has not been changed from the factory installed gear. Making this choice will skip to the next option.

• Press ‘Y’ if you have installed a rear gear with a ratio that is different than the original factory gear. This choice will recalibrate your speedometer/odometer readings and part- throttle shifting for automatic transmissions for the new gear ratio. Press the

▲ and ▼ arrows to see all of the gear ratios available

for your vehicle.

• Press ‘Y’ to lock in the gear ratio that you have installed.

At any time you may press ‘N’ to allow you to either try

again or skip to the next option.

NOTE: For automatic transmissions, a selection of any of

the available rear gear ratios will automatically set wide-open throttle shifts similar to original factory RPM settings for the new rear gear ratio.

F. TRANSMISSION

•

If your 8.1L vehicle is equipped with an Allison transmission, the programmer will not offer rear gear or transmission options. Press ‘Y’ and the programmer will skip to the Report. If your 8.1L vehicle is not equipped with an Allison transmission, press ‘N’ and the programmer will proceed to the rear gear ratio (Section E) options, then go into the shift points (Section G) and shift firmness (Section H) options.

•

If you have a 4.3/4.8/5.3/6.0L vehicle and press ‘Y’, the programmer will continue with the shift points and shift firmness options. If you press ‘N’, the programmer will skip to the Report.

CAUTION!

The speedometer and odometer will not be corrected accurately

if you use one (1) of the following tire size/rear gear ratio combinations:

4.10 gear with a tire height smaller than 26 inches

4.56 gear with a tire height smaller than 29 inches

IF REAR AXLE RATIO HAS BEEN CHANGED FROM ORIGINAL, PRESS Y

IF REAR AXLE RATIO HAS NOT BEEN CHANGED, PRESS N

USE UP/DOWN ARROWS TO SELECT CORRECT REAR AXLE RATIO, THEN PRESS Y TO SELECT OR N TO EXIT.

_ _ _ – –_._ _:1

IF YOU HAVE AN AUTOMATIC TRANSMISSION, PRESS Y

IF YOU HAVE A MANUAL TRANSMISSION, PRESS N

IF YOU HAVE AN ALLISON TRANSMISSION, PRESS Y

IF YOU DO NOT HAVE AN ALLISON TRANSMISSION, PRESS N

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G. TRANSMISSION SHIFT POINT MPH & RPM

(AUTOMATICS ONLY)

Be sure to read and understand this entire section before attempting to reprogram your shift points.

The shift point option allows you to change the RPM at which your transmission shifts at wide-open throttle, to find the very best shift points for maximum acceleration. You can try optimizing the shift points using the seat-of-your-pants technique, but how will you know if your e.t.’s improved? The only accurate method for this optimization is at the track with timing slips as the measuring device.

In order to optimize the performance of any vehicle, consistent test results are necessary. If a vehicle varies plus or minus

1/10th of a second in the quarter-mile, run to run, with no changes, it is impossible to test any product (shift point, starting line RPM, etc.) that has the potential to gain 1/10th or 2/10ths of a second, because the gains or losses on any one (1) run could be due to inconsistency rather than the variable being tested. Therefore, before testing anything, make the vehicle consistent.

Wheel-spin, if present, is the overwhelming cause of inconsistency. You must develop a starting-line technique that gives

you the best repeatable elapsed times. Tires are the most important product you need to cure wheel-spin. For street-driven vehicles, we recommend D.O.T. approved street slicks as large as you can fit under the wheel wells of your vehicle. In any case, before testing shift points, arrive at the starting line technique that gives you the best repeatable results, with or without slicks.

Throw out any run with excessive wheel-spin, and try to get at least three (3) runs that repeat within 4 or 5 hundredths of a second. Then average them and use this average value (not just your best run) for all testing comparisons. Your best e.t.’s will occur when you leave as hard as you can without wheel-spin. Confirm this by practicing and observing the results.

And finally, a very important point for any and all highperformance testing: always test only one (1) variable at a time until it is optimized. For shift point optimization, this

means test only one (1) shift point at a time until the best RPM is found, leaving all other shift points alone. Once the best 1-2 shift point is found, program it in and leave it. Then repeat the same optimization procedure for the 2-3 shift point.

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It is not usually necessary to optimize the 3-4 shift point (unless the gearing in the vehicle causes the shift to occur during the 1/4mile run) because it will occur at a speed so high that it is out of range, even on a race track. However, if gearing is causing either the 2-3 or the 3-4 shift to occur

just before the end of the 1/4-mile, you should try raising the shift point enough to allow the vehicle to cross the finish line without making that last shift.

The highest shift point RPM you can use must always

be less than the rev limit RPM.

If you do hit the rev limit, the computer will shut the fuel off until RPM drops sufficiently, so let off the throttle and abort that test run. The rev limiter is there to protect your valve-train and the engine from damage. Even if you went quicker every time you raised the shift point RPM, stop at 100 RPM below the rev limit. That’s the

most

RPM you can use safely for that shift point.

• This is the first screen you will see:

• If you press ‘Y’, you will see the following screen:

• Press the

▲ arrow once for 1 MPH, twice for 2 MPH, etc. and

then press the ‘Y’ button to enter your 1-2 shift point choice. If you don’t want to change the 1-2 shift point, enter a zero, and press ‘Y’.

The automatic transmission shift point adjustment range is:

1-2 shift: +/-6 MPH (In 1 MPH increments) 2-3 shift: +/-12 MPH (In 1 MPH increments) 3-4 shift: +/-18 MPH (In 1 MPH increments)

After downloading the 1-2 shift point you want to test, disconnect the programmer and make your test runs (At least three (3), but as many as needed to get three (3) good runs for averaging.). If you’ve seen a gain, continue moving in that direction until you begin to slow down or until you are within 100 RPM of the rev limiter. You can now review all of your test results, select the best 1-2 shift point for your vehicle, and program it in. If two (2) different shift points run the same average e.t.’s, use the lower MPH and RPM to save wear and tear on the vehicle. Repeat the same procedure for the 2-3 shift and the 3-4 shift.

TO ADJUST TRANSMISSION SHIFT POINTS, PRESS Y

TO KEEP STOCK SHIFT POINTS, PRESS N

USE UP/DOWN ARROWS TO ADJUST SHIFT POINTS, THEN PRESS Y TO SELECT OR N TO EXIT.

1-2 SHIFT +0 MPH

Page 18

NOTE: These tables are for general reference ONLY.

Vehicles will vary slightly depending on tire height and accuracy of the tachometer.

GM VEHICLE

AUTOMATIC TRANSMISSION SHIFT TABLES

(30” Tire Height)

REAR GEAR RATIO 2.73:1