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Adjusting the ride height:
• Raise and support the vehicle. Both left andright side wheels should be lifted off the
ground to allow adjustment of the spring
seats without damage. Never make ride
height adjustments with the suspension
loaded. The helper spring should never be
fully compressed while adjusting ride
heights.
• Remove the wheel and tire assembly.
• Loosen the set screw on the lower spring seat (approx 1 turn).
• To lower the ride height, use the spanner wrench and rotate the lower spring seat counter-clockwise (as viewed fr om below the damper). Use the set screw as a
reference to return to street height.
• To raise the ride height, first turn the seat in the counter-clockwise direction and ensure the threads are clear of debris. Use the spanner wrench and reverse the
direction.
• Tighten the set screw to 22 in-lbs (2.5 N·m). DO NOT over tighten this screw.
• The ride height adjustment sensitivity is as follows: • Front: One turn = 0.104 in. (2.6 mm) height change at frame
• Rear: One turn = 0.134 in. (3.4 mm) height change at frame
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Compression Adjustment
• The compression adjustment (also calledbump) varies the damping of the upward
travel of the wheel relative to the vehicle.
• The compression adjuster is located on the remote canister fixed to the damper body
and has 14 damping positions. Depending
on vehicle ride height, the car may need to
be raised to gain access to the compression
adjuster. To adjust the compression
damping, turn the finge r knob: clockwise
stiffens; counterclockwise softens when
viewed from the top surface of the finger
knob.
• All settings are referenced from the full stiff (position “0”). The “0” position on
compression is achieved by turning the
finger knob clockwise until you cannot turn
it any further.
CAUTION!
To avoid damage to your dampers DO NOT force the finger knob when it stops turning.
Also, NEVER use any tools to adjust the finger knob.
• From the “0” position, turning the adjuster cou nterclockwise will soften the damping.
Count off the clicks and record your setting. Every “click” is a new damping position
(i.e. two clicks softer from the full stiff position is position “2”).
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Rebound Adjustment
• The rebound adjustment (also called droop)varies the damping of the downward travel
of the wheel relative to the vehicle.
• The rebound adjuster is located on top of the piston rod and has 19 damping
positions. Depending on vehicle ride height,
the car may need to be raised to gain access
to the rebound adjuster. To adjust the
rebound damping, turn the upper finger
knob: clockwise stiffens; counterclockwise
softens when viewed from above.
•
All settings are referenced from the full stiff
(position “0”). The “0” position on rebound
is achieved by turning the finger knob
clockwise until you cannot turn it any further.
CAUTION!
To avoid damage to your dampers DO NOT force the finger knob when it stops turning.
Also, NEVER use any tools to adjust the finger knob.
• From the “0” position, turning the adjuster cou nterclockwise will soften the damping.
Every “click” is a new damping position (i.e. two clicks softer from the full stiff
position is position “2”).
Street Set Up
• Best Comfort is achieved at the following damper settings and should always be used when driving on the street:
Front Compression Position “13”
Front Rebound Position “18”
Rear Compression Position “13”
Rear Rebound Position “17”
Ride Height Adjustment
• The factory ride height of your ACR is approximately: Front: 514in. (132 mm)
Rear: 6 in. (153 mm)
• Measured from the bottom of frame rail to ground at the axle centerline with no passengers, a full tank of fuel and tire pressures set to 29 psi.
• A low ride height setting may not be optimal at all tracks. It will generally be more acceptable to run a lower ride height at a track with smoother surfaces, fewer abrupt
elevation changes and fewer bumps. The optimum set up for your vehicle also varies
with track, driver and ambient conditions. Below is a recommended starting point for
two typical track configurations.
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Smooth track set up:
Front: 4 in. (102 mm)
Rear: 5 3/8 in. (136 mm)
Rough track set up:
Front: 4.375 in. (111 mm)
Rear: 5 1/2 in. (140 mm)
• The rake of the car (or front to rear ride height difference) may also be changed with your ACR suspension. Changing the rake may be beneficial at some tracks. Use
caution when changing the rake angle.
CAUTION!
Depending on your set up, driving styl e, and track condition, some tire to wheel liner
contact may occur. To avoid excessive wheel liner wear, adjust your ride height
accordingly.
Notes on Tuning
Damper Adjustment
• Adjusting from the street settings should be done only at track events. A
recommended starting position for the tracks is:
Front Compression Position “6”
Front Rebound Position “6”
Rear Compression Position “5”
Rear Rebound Position “5”
• Always start from a known position (full stiff).
• Adjust in small increments (1-2 clicks).
• Record your adjustment settings at all four wheels.
• Continually monitor and record your tire pressures.
• Remember that suspension damping, ride heights, rake angle and aerodynamic
balance all work as a system. As you make changes to one end of the vehicle, it will
affect the balance of the car.
Maintenance and Inspection
• Regularly inspect the splitter rub strips and out board knock-in nut. Regularly inspect
all attachments of the aerodynamic components (see Aerodynamics section).
• Track use will greatly increase wear rates and service intervals on your Viper ACR. Repeated track use requires more frequent fluid changes.
NOTE: Although your vehicle is shipped with 0W40, it is recommended to use Mobil-1
15W50 synthetic motor oil at the track.
• Always run a cool down lap at the end of a track outing. For track outings lasting longer than 25 minutes, an external rear axle cooler is recommended.
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HARD CORE PACKAGE
• This option is for the Hard Core track enthusiast who is looking for maximum weight
savings.
• The Hard Core Package eliminates the Audio System (including the radio, amplifier,
door speakers and subwoofer). Also delet ed are the under hood silencer pad, the
trunk carpet and the tire inflator. The door speakers are replaced by carbon fiber
panels. The radio is replaced by a lightweight cover that can be configured to mount
the included Lap Timer.
CAUTION!
The tire inflator has been removed from the Hard Core package. There are no
measures for flat tire repair included with this vehicle. It is recommended that drivers
always bring a mobile phone in case of a flat tire.
• The removal of the trunk carpeting reduces sound insulation. It is normal to hear more road and drivetrain noise.
• The Lap Timer kit includes the Timer, Beacon Receiver, a power cord, download kit and the Beacon Transmitter.
• The Lap Timer displays lap times on a large illuminated digital display. It continuously updates the fastest laps and acquires a running data log of all times during the track
event. This data can be do wnloaded for analysis via a USB connection. Refer to your
AiM lap timer manual for instructions.
• The cables to the beacon receiver and power jack include extra long lengths. This is to provide the ability to custom fit the timer and beacon receiver depending on the track
and/or driver preference.
• Note on Lap Timer: For lap timer software updates and technical support contact www.aimsports.com/software/index.html.
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TUNING RECORDDate & TrackAdjustments Notes
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LIMITED WARRANTY
• The ACR offers many race-ready components that are designed for uncompromising
performance. Because of this, some of the ACR components have unique warranty
limitations.
Racing Not Covered
• The warranty does not cover the cost of repairing damage or conditions caused by racing, nor does it cover the repair for any defects that are found as the result of
participating in a racing event. The term racing includes but is not exclusive to: wheel
to wheel competition, timed competitive events, autocross or other off-road track
events.
Splitter
• The splitter is not covered for wear on the rub strips or damage due to contact with parking blocks, speed bumps, curbs, s loped tarmac, etc. The warranty is not valid if
adjustments or modifications are made to the splitter.
Wing
• The warranty does not cover any adjustments or modifications made to the wing or if the original fasteners or positions have been changed.
Tires
• 12 months / 12,000 miles - Excessive tire wear due to track events, autocross,competition, etc. are not covered.
Brake Pads/Rotors
• 12 months / 12,000 miles - Excessive brake pad and rotor wear due to track events,autocross, competition, etc. are not covered. No warranty for noise complaints.
Adjustable Coil-over Shocks
• The factory warranty is 12 months / 12,000 miles. KW Suspensions has an extendedsupplier warranty up to 36 months or 36,000 miles. The warranty is not valid if
modifications or improper adjustments are made to the factory settings.
KW automotive North America Inc.
1075 North Avenue
Sanger, CA 93657
Toll Free: 1-888-713-5566
Email: [email protected]
http://www.kw-suspension.com/en/
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ACKNOWLEDGEMENT
• The customer acknowledges that the dealer has provided him/her with basic
instruction in the following areas, including the cautions, limitations and warranty
coverage of this package.
Key areas:
• Overview / Limit Handling
• Aerodynamics
• Single Season Semi-Slick Tires
• Two-Piece Brake Rotors
• Brake Pads
• Adjustable Coil-over Shocks
• Warranty - Racing Not Covered
Customer Signature:
Dated:
Dealer Signature:
Dated:
Note to Dealer: Please photo copy this acknowledgement and retain a copy in your sales
records.
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