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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PERFORMANCE/ACR
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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PERFORMANCE/ACR
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.
PERFORMANCE/ACR
42
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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PERFORMANCE/ACR
VEHICLE STORAGE
We recommend that you follow these guidelines for storing your vehicle for extended
periods.
• Fill the fuel tank. This will prevent water condensation inside the tank. If you plan to store your vehicle more than two months, add an anti-oxidant fuel stabilizer to the
fuel tank.
• Change the oil to remove any corrosive combustion related acids in the crankcase.
• Check that the radiator coolant level of protection is to at least -20°F (-29°C).
• Make sure that all tires are inflated to the optimum pressure.
• Wash and wax the vehicle to protect the finish.
• Store the vehicle in a dry, well-ventilated location.
• Move the wiper blades away from the windshield.
• Block the wheels. Do not apply the parking brake.
• Cut blocks of plywood about the same size of the tires. Cover each block with indoor/outdoor carpeting and place them between the tires and concrete. This will
prevent tire flat spotting.
• For long-term storage, remove the tires and put the vehicle up on blocks. Stack the tires on plywood and cover wit h a tarp to prevent flat spotting.
• If the vehicle will be subjected to freezin g temperatures, either remove the battery and
store it in a dry, well ventilated area or connect a trickle charger (1.5 Amp) with
automatic shutdown / overcharge protection to the battery. However, do not leave the
trickle charger hooked up to the battery without being plugged in to a 110 Volt AC
outlet, as this will result in further drain on the vehicle's battery. If the vehicle is not
going to be driven in the next three weeks, per form the battery recharge procedure in
the Service Manual. Then, either disconnect the b attery at the negative terminal or use
the “Battery Save Feature” to conserve battery power.
NOTE: Disconnecting the battery causes the en gine control system to lose memory of
some “learned” functions. After reconnecting the b attery, the engine may run rough until
the control module “relearns” these functions. Using the Battery Save Feature will
prevent the engine controller from loosing its memory.
CAUTION!
Use care when disconnecting the remote positive cable. It is connected to the battery
and can short out to any metal on the vehicle. Always tape or wrap the exposed cable
end to prevent electrical shorts.
• Check the battery every four to six weeks to ensure that the voltage is above 12.40 Volts. The voltage will drop more rapidly in hot temperatures. If battery voltage
drops below 12.40 Volts, follow the battery r echarge procedure in the Service Manual.
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MAINTAINING YOUR VEHICLE