Zex 82185 User Manual

Installation Instructions

Dual Perimeter Plate Nitrous System (#82185)

Thank you for choosing ZEX™. If at any time you have questions regarding this or any of our products, please
call our ZEXTEK™ support line at 1-888-817-1008.

Read this installation manual completely before attempting to install your nitrous system. Failure to do so may
result in damage to your engine or vehicle and/or physical harm to yourself. ZEX™ is not responsible for
damage or injuries caused by improper use of this nitrous kit.

ZEX™ 3418 Democrat Road, Memphis, TN 38118

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ZEX171

Revised 4/6/06

Kit Parts List

DESCRIPTION QTY. DESCRIPTION QTY.

Nitrous Solenoid 1
Fuel Solenoid 1
12" -4AN Hose, 3 AN nut, 1/8 NPT end 4
16' Hose, -4AN, purple 1
Perimeter Plate 2
Carb Gaskets 4
¼ NPT to –4 AN Filter Fitting 1
¼ NPT to 3/8 Barb Fitting 1
1/8 NPT Male Tee Fitting 2
10lb. Nitrous Bottle w/Valve 1
Bottle Bracket (short) 1
Bottle Bracket (long) 1
Solenoid / WOT Switch Bracket 3
.043 N20/Fuel Jet 2
.046 N20/ Fuel Jet 2
.053 N20/ Fuel Jet 2
.056 N20/ Fuel Jet 2

.067 N20/ Fuel Jet 2
.105 N20/ Fuel Jet 2
Arming Switch 1
Wide Open Throttle Switch 1
Red 18 GA. Wire 15ft.
Red 14 GA. Wire 15ft.
30amp Fuse Holder 1
30amp Fuse 1
Bosch 20amp Mini Relay 1
5/16-18 X 1" Bolt for Bottle Brackets 4
5/16 - 18 Nut for Bottle Brackets 4
5/16 - 24 Nut for Carb Studs 8
5/16 Flat Washer 12
Solenoid Bracket Screws 4
4-40 Socket Head Screws 2
4-40 Lock Nuts 2
Extended Carb Studs 8

.064 N20/ Fuel Jet 2

Why our nitrous system is better

• Fits all popular square flange 4-barrel, side-by-side carb, tunnel ram intake manifolds. Easy to install.

• Adjustable from 150-300 horsepower. Powerful enough for racing use, but easily jetted down for the street.

• Injects at 24 unique points surrounding the intake manifold plenum. Eliminates 30 year-old technology

spray bars and optimizes distribution of fuel and nitrous into the engine.

• Cryogenic design flows super-chilled nitrous through the entire plate, before being sprayed into the engine.

This creates a cooling “deep freeze” effect on the carburetor and intake manifold for additional power.

• The injector plate is machined from solid billet aluminum. This ensures precision flow, unlike cast plates

and old-technology spray bars the competition uses.

Quick Start Reference Guide

How the ZEX™ Dual Perimeter Plate Nitrous System works:

The ZEX™ 82185 nitrous system begins with a connection to a supply cylinder containing pressurized liquid
nitrous oxide and a connection to the engine’s fuel system. These connections go to the system's nitrous and fuel
solenoids, respectively. These solenoids are normally closed, but are opened when the nitrous system is armed,
and the throttle activation switch is activated by the carburetors going to wide-open throttle. Once these
solenoids open, the nitrous and fuel are delivered to the injection plates via braided stainless steel delivery lines.
The amount of nitrous and fuel that is injected through the plates is adjustable by means of metering jets installed
in the plates themselves. These metering jets allow for easy changes in horsepower settings.

Work safely: Always wear eye protection and gloves when working with lines or hoses that contain

pressurized nitrous oxide or fuel. Never transport nitrous cylinders loose behind a seat or in the back of a pick-up
truck. Always disconnect the GROUND side of the battery when working on any electrical components.

Nitrous oxide won't fix problems you already have: Before you install your nitrous system, be sure

your engine is in good mechanical condition. Intermittent wiring problems, etc., can lead to erratic system
performance and possible engine damage.

Never defeat operation of the safety relief disc in the nitrous cylinder's valve: It's required by

law and is there for your safety. Never drill, machine, weld, deform, scratch, drop, or modify a nitrous oxide tank
in ANY way whatsoever!

Never overfill nitrous cylinders: That little bit extra will put you and others at risk of injury. More often

than not, when the cylinder warms up, the pressure goes above the limit of the safety relief disc and you lose all
the nitrous you just paid for.

All the power comes from the fuel, not the nitrous: Nitrous oxide is simply a tool that allows you to

adjust how much and how quickly the engine burns the fuel. If the fuel isn't there, the power won't be either.

Avoid detonation at all times: Nitrous enhanced detonation is much more damaging than detonation that

occurs when naturally-aspirated due to the increased amount of fuel available for releasing energy and the fact
that more oxygen is present.

When system is activated, if something doesn't feel or sound right, BACK OFF: If you hear

any detonation or feel anything unusual, get off the throttle. It's a lot easier to check everything over than it is to
just try to drive through it and damage expensive parts. Don't activate or have the system activated when you hit
the rev limiter.

Do not use Teflon sealing tape on any fittings in a ZEX™ Nitrous System:

It is easy for Teflon tape to get pulled into the system, causing blockages that can ultimately lead to incorrect
nitrous system performance and potentially, engine damage. Only use liquid thread sealer for all NPT type
fittings. Do not use any thread sealing compound on AN style fittings.

Do not attempt to start engine if nitrous has been accidentally injected into the engine
while it was not running:

Disable the ignition and, with the throttle wide open, turn over the engine for several seconds to clear the nitrous
from the engine. Failure to do this before restarting the engine can lead to a dangerous intake system backfire.

Do not engage your nitrous system below 2500 rpm:

This ensures that you will not have excessive cylinder pressures that could cause engine damage.

When finished using your nitrous system, close the bottle valve and relieve line pressure:

This eliminates the possibility that nitrous could inadvertently accumulate in the intake manifold while the
nitrous system is not being used.

Do Not Run Excessive Bottle Pressures:

Excessive bottle pressures, over 1100 psi, are dangerous to your engine. Your ZEX™ nitrous system is
calibrated and optimized to operate from 900-1000 psi. Exceeding this will not improve performance. Over
1100 psi also runs the danger of locking the nitrous solenoid closed due to excessive pressure working against
the valve’s plunger. If this happens, you must cool the nitrous bottle down to lower the pressure. This will
allow the valve to operate properly.