Hudy X-Ray X10 Setup Manual
FOR ALL 1/8
OFF-ROAD
& TRUGGY
®
2
CONTENTS
Introduction 3
Equipment and Tools 4
Set-up System Components 4
Tools and Equipment 5
Assembling and Installing the Set-up Stands 7
Assembling the Set-up Stands 7
Assembling the Set-up Board 8
Installing the Set-up Stands 8
Overview of Car Set-up 9
Downstops 10
Effects of Downstop Adjustment 10
Measuring Downstops 10
Adjusting Downstops 11
Ride Height 12
Effects of Ride Height Adjustment 12
Measuring Ride Height 12
Adjusting Ride Height 13
Camber 14
Effects of Camber Adjustment 14
Measuring Camber 14
Adjusting Camber 16
Track-width 14
Effects of Track-width Adjustment 16
Measuring Track-width 16
Adjusting Track-width 17
Caster 18
Effects of Caster Adjustment 18
Measuring Front Caster 18
Adjusting Front Caster 19
Toe 20
Effects of Toe Adjustment 20
Measuring Toe 20
Adjusting Toe 21
Steering 22
Ackermann 22
Servo Saver Preload 23
Bump Steer 23
Roll Center 24
Front Roll Center 24
Rear Roll Center 25
Shock Absorbers 26
Shock Damping 26
Shock Pistons 26
Shock Oil 27
Shock Springs 27
Shock Mounting Position 28
Shock Preload 28
Kick-up (Front) 29
Effects of Front Kick-up Adjustment 29
Adjusting Front Kick-up 29
Anti-squat (Rear) 30
Effects of Rear Anti-squat Adjustment 30
Adjusting Rear Anti-squat 30
Wheelbase 31
Effects of Wheelbase Adjustment 31
Adjusting Wheelbase 31
Anti-roll Bars 32
Effects of Anti-roll Bar Adjustment 32
Adjusting Anti-roll Bars 32
Rear Wing 33
Effects of Rear Wing Adjustment 33
Adjusting the Rear Wing 33
Clutch 34
Clutch Springs 34
Clutch Shoe Orientation 34
Differentials 35
Differential Oil 35
Differential Gears 36
Optional Differentials (XRAY Active Diff™) 36
Gearing 37
Primary Drive Ratio 37
Gear Mesh Adjustment 37
Wheels, Tires and Inserts 37
Recommended Chemicals for Off-road Cars 39
3
INTRODUCTION
Top-competition off-road cars/truggies are precision racing machines that feature multiple
adjustments that allow you to set up for any track condition. Most modern off-road cars/
truggies include innovative set-up features that allow you to change adjustments quickly
to achieve a full range of adjustment.
The HUDY Off-road Set-up Book describes how to adjust your off-road car/truggy to suit
your driving style. For each individual set-up area, we describe the effects of changing
the adjustment and how to make the adjustment.
When setting up the car/truggy it is very impor tant that the car sits on an ultra-fl at surface.
We strongly recommend using high-quality HUDY professional set-up tools – including
an ultra-fl at set-up board and marking decal – for every set-up adjustment.
The Basic Set-Up Sheet for your vehicle is always a very good overall starting point. After
rebuilding the chassis, or in case you become lost with your set-up, always return to the
basic starting set-up. If you choose to experiment with set-up, make small adjustments
one at a time, and see if you fi nd any improvement with each adjustment. We strongly
advise you to record and keep track of your set-up changes, record which set-ups work
best at different racetracks under various conditions.
If you own an XRAY model racing car then you can use blank XRAY Set-Up Sheets to
record your data and set-ups or use the unique Virtual Online Database set-up sheets at
www.teamxray.com where you can upload and share your set-up sheets or search for
other set-up sheets posted by factory team drivers or search particular set-up for your
track. The XRAY Virtual Online Database features thousands of set-up sheets and is the
world’s most unique set-up sheet source for your reference.
IMPORTANT!
The adjustment possibilities and methods of adjustment shown in this HUDY Off-road
Set-up Book are particular to the XRAY XB808 1/8 off-road nitro buggy. The general
theory behind the adjustments applies to all off-road vehicles, though the manner in
which the measurements and adjustments are made may differ on other vehicles. Some
of the off-road cars may not have possibility for some adjustments or may require use of
some other optional parts to be able to per form some of the set-up adjustments. Always
refer to the original manufacturer’s documentation for explicit instructions on how to
make set-up adjustments.
4
EQUIPMENT AND TOOLS
When setting up, operating and maintaining your off-road car or truggy, we strongly
recommend using high-quality professional HUDY set-up equipment and tools.
SET-UP SYSTEM COMPONENTS
#108805 Exclusive Alu Set-Up System
For All 1/8 Off-road Cars & Truggies
•
CNC-machined alu. and acrylic components
• fully ball-bearing equipped
• precision engraving
• directly measures camber, camber rise,
caster, toe, steering throw symmetry
• easy one-screw assembly/disassembly
#107703 Droop Gauge Support Blocks
• CNC-machined high-grade aluminum
• precision engraving
• supports chassis when checking
downstops
• extra-high 30mm blocks for 1/8 off-road
cars & truggies
• used with 107717 Droop Gauge
#107717 Droop Gauge
• CNC-machined high-grade aluminum
• precision engraving
• measures downstops for off-road
vehicles when used 107703 Droop
Gauge Support Blocks
#108202 Set-Up Board
• exceptionally fl at, warp-resistant
surface
• lightweight, easy to carry
• provides perfectly fl at reference surface
for chassis set-up
• must be used for any set-up
adjustments
#108212 Set-Up Board Decal
• self-adhesive set-up decal for 108202
Set-Up Board
• accurate, clear markings for adjustment
of 1/8 Off-road cars & truggies
• tough, smooth, liquid-resistant plastic
surface
• used for track width adjustment and
checking
#108860 Alu Nuts for Set-up System
• CNC-machined alu nuts for quick &
easy attachment of set-up system plates
to wheel axles
#108841 Truggy Upside Measure Plate
• CNC-machined upside measure plate
(toe plate) for setting up 1/8 truggies
• made of high-quality, tough acrylic
plastic
• precision engraved markings for instant,
reliable readings
• used for the adjustment of: camber &
camber rise, caster, front and rear toe,
steering throw symmetry
• must be used with the #108805 Set-up
System
5
TOOLS & EQUIPMENT
Turnbuckle Wrenches
• precision turnbuckle wrenches designed
exclusively by HUDY from special selfdeveloped, world-renown HUDY Spring
Steel™ to ensure maximum strength,
durability, and long life
• additionally hardened to provide
unmatched life span
• wrench head shape is hand-ground on
a precision grinding machine to ensure
a very precise shape to a snug fi t on the
turnbuckle
•
the fork end of the tool is additionally
ground fl at to keep the tool shape as thin as
possible for very easy access in restricted
areas
• available in 3 sizes: 3mm (#181030),
4mm (#181040), and 5mm (#181050)
HUDY Tools
• Allen 1.5 / 2.0 / 2.5mm
(HUDY #111549 / #112049 / #112549)
• Phillips 5.0mm
(HUDY #165049)
• Socket 5.0 / 5.5mm
(HUDY #170058 / #170059)
#182010 Flywheel Tool
• CNC-machined professional Flywheel
Tool off-road and on-road nitro vehicle
clutches
• fl ywheel holder holds all modern RC nitro
car fl ywheels with 2-to-4 pin designs,
allowing you to loosen or tighten the
fl ywheel nut very comfortably and
easily.
• use with 107581 Wrench-Glowplug /
Clutchnut to hold and loosen/tighten
fl ywheel nuts quickly & easily
• other features (including clutch gap
measurement, XCA-style clutchbell
holder) for use with on-road XCA-style
clutches
#107570 Wheel Nut Tool
• CNC-machined hardcoated tool for easy
loosening/tightening 17mm wheel nuts
on 1/8 off-road cars and truggies
• oversized handle gives superior torque
• robust design, machined from one piece
• hard anodized for extra-long lifespan
#107581 Wrench-Glowplug / Clutchnut
• unique, highly-useful combination tool
for nitro racing includes the following:
• 10mm socket wrench for Centax type
fl ywheel nut
• 8mm socket wrench for glowplug
• 5mm hex bit for suspension pivotballs
• extended 8mm glowplug wrench reaches
glowplug even in deep cylinder heads
• made of world-renowned HUDY
Spring Steel™ for highest strength and
durability
• lightweight, perfect-fi t tool
• laser-engraved for easy tool
identifi cation
6
#107610 Exhaust Spring/Caster Clip Remover
• designed to easily and quickly remove
caster clips and exhaust springs
• tip from specially hardened steel
• very light non-slip duraluminum handle
• very durable, long life
#107600 Reamer For Lexan Bodies
• professional-quality reamer cuts perfect
holes 0-18mm diameter
• exclusive design by HUDY
• very light non-slip duraluminum handle
• special CAD-designed cutting head, handground on specially-modifi ed production
machinery
• perfect & comfor table cutting and use
Arm Reamer
• designed specifi cally for RC use, this
arm reamer precisely resizes plastic
holes without creating excessive slop,
allowing you to build a perfect free-moving
suspension
• comfortable molded handle
• quick & easy to use
• available for different size pins: 3.5mm
pins (#107632), 3.0mm pins (#107633),
4.0mm pins (#107634).
#106000 Drive Pin Replacement Tool
• compact, rugged multi-use tool set for
replacing 3mm drive pins in drive shafts
• heavy-duty construction for long life
• replacement pin sets available separately:
3x14 (#106050)
3x12 (#106051)
3x10 (#106052)
#104140 HUDY Engine Break-In Bench
• the ultimate tool for easy, safe, and
professional break-in of your .12/.15/.21
engine
• suits all bump-start SG crank engines
• allows for a controlled break-in process that
reduces wear & tear on engine components
and increases performance, reliability, and
longevity
• constructed of top-quality components of
tough aluminum and spring steel
• comes partially assembled from the factory
7
ASSEMBLING AND INSTALLING THE SET-UP STANDS
When you are measuring and adjusting track-width, camber & camber rise, caster,
toe, steering throw symmetry, and tweak, you will need to assemble and install the
set-up stands.
When you are measuring downstops and ride height, you do not need to use the set-up
stands.
ASSEMBLING THE SET-UP STANDS
The set-up stands of the Exclusive Alu. Set-Up System For All 1/8 Off-road Cars &
Truggies must be assembled in order for you to use them. These stands were designed
for quick and easy “one screw” assembly and disassembly
The set-up stands consist of the
following pieces:
• alloy side plates front (2)
• alloy side plates rear (2)
• alloy camber gauges (4)
• acrylic toe gauge (1)
➊ Attach a camber gauge to a side plate
using a screw through the ball-bearing at
the top of the camber gauge.
➋ Using a 2.0mm Allen wrench, tighten
the screw until snug.
➌ Make sure the stand operates freely
without binding.
8
➋
Remove the paper from the rear of the
decal, exposing the adhesive backing.
➌ Center the decal on the board, and
then press the entire decal fi rmly onto the
board.
➍ Rub the decal until it is fl at and
completely adhered to the board.
INSTALLING THE SET-UP STANDS
After you have assembled the four set-up stands, mount them to your car as follows.
➊ Remove the wheels from the car. In
place of the wheels, mount a set-up stand
on each of the four axles. In front use side
plates with scale, while in rear use side
plates without scale (only with HUDY logo).
➋ The camber gauge of each stand
should face outward so it is easy to read.
The camber gauge of the front stand
should face forward, while the camber
gauge of the rear stand should face
rearward.
➌ Place the car (with the mounted set-up
stands) on the set-up board.
FRONT
REAR
ASSEMBLING THE SET-UP BOARD
The completed set-up board consists of the Set-Up Board and the Set-Up Board Decal.
IMPORTANT:
You should always use only the HUDY set-up board when setting up your car with the
HUDY All-In-One Set-Up Solution. This exceptionally fl at, warp-free board will ensure
accurate, precise measurements.
➊ Clean the board with a soft cloth to
remove any debris or contaminants.
9
OVERVIEW OF CAR SET-UP
When setting up your off-road car/truggy, we recommend setting it up in the order
indicated in the table below. The order of the settings has been determined as the most
logical to set up your car/truggy properly and easily. Also, certain settings must be
made before others, as changing one setting will impact another setting.
The table below also lists the set-up components to be used to measure or adjust a
particular setting.
TO MEASURE OR ADJUST USE
Downstops
•
Flat set-up board
• Droop gauge support blocks
• Droop gauge
Ride height
• Flat set-up board
• Droop gauge
Camber
• Flat set-up board
• Droop gauge support blocks
• Assembled set-up stands
Track-width
• Flat set-up board
• Board decal
Caster
• Flat set-up board
• Assembled set-up stands
Toe
• Flat set-up board
• Droop gauge support blocks
• Assembled set-up stands
• Toe gauge
There are several types of suspensions used on RC cars, including pivotball and C-hub
suspensions. Each suspension type has its own way of making adjustments for
downstops, camber, caster, toe, etc. For detailed information on adjusting the settings on
your car, refer to the appropriate set-up manuals for your car.
When setting up your off-road car/truggy, you should always prepare it so it is ready to
run, though without the body. This means you should install all electronics, batteries, and
fi ll the fuel tank (nitro only).
10
1.1 DOWNSTOPS
Downstops limit how far the suspension arms travel downward, which determines how
far upward the chassis rises. This affects the car’s handling (due to effects on camber
and roll-center) and the ability of the tires to “follow” the track. The effects may change
with the type of track and/or amount of grip available. Downstops are a very sensitive
adjustment, since they alter weight transfer, and all aspects of chassis performance are
affected: braking, acceleration, jumping, traction and rough track handling.
More suspension travel (lower downstop value) makes the car more responsive but less
stable; it is also typically better on a bumpy track or on a track with slow corners. This
allows the chassis to “pitch” rearward or forward more under acceleration or braking
(respectively), which results in more weight transfer.
Less suspension travel (higher downstop value) makes the car more stable and is
typically better on a smooth track. This prevents the chassis from “pitching” rearward
or forward too much under acceleration or braking (respectively), which results in less
weight transfer.
It is very important to have the same downstop settings on the left and right sides
of the car.
EFFECTS OF DOWNSTOP ADJUSTMENT
FRONT DOWNSTOPS
Higher downstop value
(arm is higher
, less
travel)
• Decreases front chassis upward travel on-throttle
• Less rearward weight transfer
• Better on smooth tracks
• More on-power steering
• More responsive in direction change
Lower downstop value
(arm is lower, more
travel)
• Increases upward chassis travel on-throttle
• More rearward weight transfer
• Increases rear traction on corner exit
• Better on bumpy tracks
REAR DOWNSTOPS
Higher downstop value
(arm is higher
, less
travel)
•
Decreases rear chassis upward travel off-throttle or
under braking
• Less forward weight transfer
• Better on smooth tracks
Lower downstop value
(arm is lower, more
travel)
• Increases rear chassis upward travel off-throttle or
under braking
• Less stable under braking
• Increases steering on corner entry
• Better on bumpy tracks
• More turn-in
MEASURING DOWNSTOPS
INITIAL STEPS SET-UP COMPONENTS
Prepare the car as follows Use the following set-up components
• Shocks: Attach the shocks
• Anti-roll bars: Attach the anti-roll bars
• Wheels: Remove the wheels
• Droop Gauge Support Blocks #107703
• Droop Gauge #107717
• Set-up Board #108202
11
➊ Place the droop blocks on the fl at set-
up board, and then place the fl at part of
the chassis (not the angled part) on the
blocks. Make sure the chassis is solidly
mounted on the support blocks so it does
not move.
➋ Lift and drop the suspension arms so
that they settle in their lowest positions.
➌ Using the droop gauge, measure the
downstop values at the front and rear of
the car.
FRONT DOWNSTOPS:
Measure the front downstop values under
the round part of the front wheel axles. DO
NOT measure under the hex part.
The values shown on the droop gauge
indicate how many millimeters the
suspension drops below the level of the
chassis.
REAR DOWNSTOPS:
Measure the rear downstop values under
the round part of the rear wheel axles. DO
NOT measure under the hex part.
The values shown on the droop gauge
indicate how many millimeters the
suspension drops below the level of the
chassis.
ADJUSTING DOWNSTOPS
FRONT DOWNSTOPS
Increase
Turn IN (or OUT) the front downstop screw
(depending on the car design) so the front
lower arm raises up slightly.
Decrease
Turn OUT (or IN) the front downstop screw
(depending on the car design) so the front
lower arm drops slightly.
REAR DOWNSTOPS
Increase
Turn IN (or OUT) the rear downstop screw
(depending on the car design) so the rear
lower arm raises up slightly.
Decrease
Turn OUT (or IN) the rear downstop screw
(depending on the car design) so the rear
lower arm drops slightly.
IMPORTANT!
Make equal adjustments on both left and right sides of the car.
12
1.2
RIDE HEIGHT
front ride height rear ride height
Ride height is the height of the chassis in relation to the surface it is sitting on, with the car
ready to r
un. Ride height affects the car’s traction since it alters the car’s center of gravity
and roll center. Differences in ride height alter the car’s attitude (angle of the chassis)
which in an off-road vehicle can effect how it jumps and lands. Because of changes in
suspension geometry and ground clearance, there are negative consequences to altering
ride height too much.
Ride height is measured with the wheels on the car, and the car ready-to-run. Use the
shock preload collars or clips to raise and lower the ride height.
EFFECTS OF RIDE HEIGHT ADJUSTMENT
Decreasing ride height
• Increases overall stability
• Better on smooth tracks
Increasing ride height
• Decreases overall stability
• Better on bumpy tracks (prevents bottoming)
Front higher than rear
• Increases weight transfer to the rear on-power
• Increases stability
• Decreases steering
Front lower than rear
• Increases weight transfer to front off-power
• Increases steering
• Decreases rear traction
• May cause car to nosedive off jumps
MEASURING RIDE HEIGHT
INITIAL STEPS SET-UP COMPONENTS
Prepare the car as follows
Use the following set-up components
• Shocks: Attach all shocks
• Anti-roll bars: Attach all anti-roll bars
• Wheels: Attach all wheels. Both left and
right wheels at the front or rear should be
the same diameter
• Flat Set-up Board #108202
• Droop Gauge #107717
➊ Place the car on the set-up board.
➋ Lift the front of the car and let it fall back
to the set-up board by itself.
➌ Using the droop gauge, measure the
ride height value at the front of the car.
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