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Discussion Starter · #1 ·
Bought the Koni 8740-1121 struts for my mustang and need to know how to adjust them?? The instructions are to hard to make out!! And what setting for drag racing,soft or firm?? Wanted the Strange but are on backorder everywhere! THANKS!!

634 Posts
What you've purchased is not the all out, whiz-bang
Koni drag race shock (SPA 1). You probably still want
to drive on the street? That would be my assumption.
You can't really use the SPA 1's on the street. Anyway,
straight from the horse's mouth (so to speak)......
"These shocks do not need to be removed from the vehicle to be adjusted. Place the adjustment knob
included with the shocks onto the adjuster tab on the top of the shock absorber. Turn the adjusting knob
clockwise to check if the damper has been previously adjusted. If you feel resistance, DO NOT FORCE,
as the shock is in the minimum position.
To increase the Rebound force, turn the knob counter-clockwise in the direction of the “firm” arrow.
There will be 1.5-3 turns of the adjuster depending on the model. There are no specific clicks to mark the
adjustment position; the rebound adjuster can be placed in any position in the adjustment range. When
finished, remove the adjusting knob to prevent damage to the adjuster."

As far as setting them, I'm not a drag race guy, so I got
the following info for you. (again direct from Koni)
"Step 1: Prior to testing make certain that wheelie bars are raised as high as possible
while maintaining control and eliminating their influence as much as possible
on damper settings. Also install a tie-wrap to the chrome rod of the shock
and push down to where it touches the top of the body.
Step 2: Place all damping controls on minimum. Make a pass in first and second gears
in order to determine that the car goes straight. If not, the alignment, tire pressures,
etc. should be checked and corrected before proceeding any further.
Pay close attention to what occurs during gear change. If the car wheel
stands or bounces violently, you should adjust the front dampers first and
then the rears. However, if there is rear tire shake, wheel hop or excessive
body separation, adjust the rear shocks first and then the fronts.
Check also where the tie-wrap ends up after launch. If it is buried into the
bumpstop, the spring rate may either be too soft, the vehicle set too low or
the bumpstop may need to be trimmed (up to 1”).
Step 3: Front Damper Adjustment Procedure
Pay close attention to what is happening to the front end during launch and
the first gear change. Your goal is to eliminate all jerking and/or bouncing
movements so as to obtain smooth transitions at all times.
Too Light of a damper setting allows violent chassis separation and may even result
in jerking the front wheels off the ground during initial launch. Too light a setting also
allows the car, during gear change, to bounce off its front rebound travel limiter and
then bottom out in a continually oscillating manner.
Too Firm of a damper setting will prevent the tires from easily lifting off the ground
and thus providing sufficient weight transfer. During a gear change a firm setting will
also cause the chassis to bounce off the tire when the chassis settles down.
Adjust the damper by increasing the rebound damping in 1/4 turn (90 degrees) increments
until a smooth transition from launch through gear change has been achieved.
If double adjustable KONI’s are used, adjust the bump damping in 3 click increments
to control the amount and the rate at which the front end settles during gear change.
Watch your ET’s and, if your times start to get slower, back off the rebound adjustment
by 1/4 turn and the bump adjustment by 2 clicks.

Step 4: Rear Damper Adjustment Procedure
You should pay close attention to the rear of the car as your goal is to damp
the tire movements as firm as the track conditions permit. Remember that
the damper controls the amount and the rate of weight transfer to the tire.
Too Light of a damper setting allows excessive separation between the body and
the tire.
Too Firm of a damper setting allows high tire shock and causes extreme flattening
of the tire.
Adjust the rear damper in 1/4 turn (90 degrees) increments of rebound adjustment and,
if KONI double adjustable dampers are used, increase the bump adjuster by 3 clicks for
each pass.Watch your ET’s and if your times start to get slower, reduce the amount of
adjustment by 1/4 turn of rebound adjustment and 2 clicks of bump adjustment.
Step 5: When all adjustments have been completed, reset your wheelie bars as
low as possible without hurting your ET’s. Once you have completed this
procedure, only fine adjustments may be needed in the future due to varying
track conditions."

That's all I could find on setting them up.
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