How Low Can Go / Road Race set Up
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Joined: Oct 2003
Posts: 544
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From: Aiken, SC
Car: 91 Z/28, 89 RS Race Car
Engine: 305 stock / ZZ4 AFR 195 9.7:1
Transmission: T5 / t10 / Jerico
Axle/Gears: 10blt w 3.42, 9 in w /3.80 DL
How Low Can Go / Road Race set Up
I am trying to get my car as low as possible. For minimal weight transfer, but without screwing up something else.
I May be there now. BUT by no means is my combination optimal.
The car measures shop floor to fenderwell lip between 26 and 26 3/8 inches on all 4. I have not done the measurments on a dead level surface yet.
I am concerned about maintaining some suspension travel. Now there is very little. I have no noticible bump steer, but have not measured it with a dial gauge. I checked it with pulmb bob and Chalk Lines at drop and compression within the expected travel limits. I do not have any tie rod adjustment for bump steer.
Rear trailing arms are set to make the car push on compression, ( ie. outside trailing arm will get shorter) so as not to get loose from rear steer.
The car is almost on the bumpstops now and may hit on compression. BUT, this has not caused problems.
Alignment
2 5/8 Camber.
5.5 Caster
Zero Toe.
The ball joints and the arms are stock. Front Springs are 9 X 5.5 Afcoils with adjustable space. rears are 6 X 5 afcoils with adjustable spacer.
Bushings are Del a Lums front a arms. rear control arms are heims. Panhard Bar has been lowered apromimatly 4 inch and uses heims and is adjustable.
Shock and Struts are Koni Yellow.
Front Sway Bar is the G92 / 1LE
Rear Sway bar is the smallest I could find. Anything bigger and the car will swap ends.
Tires TOYO RA1 275/45/17
Operating Pressure 39 lbs hot
Wheels Vintage Wheel 9.5 X17
Engine Stock w/ t5
Weight 3464.
To me car handles exceptionally well. Mario Andretti may have another opinion. I dont have a skidpad. Or one of those G toys so I can not hypothise a current G reading.
Any comments or suggestions for improved performance or better suspension geometry are welcome and would be highly appreciated.
Thanks.
I May be there now. BUT by no means is my combination optimal.
The car measures shop floor to fenderwell lip between 26 and 26 3/8 inches on all 4. I have not done the measurments on a dead level surface yet.
I am concerned about maintaining some suspension travel. Now there is very little. I have no noticible bump steer, but have not measured it with a dial gauge. I checked it with pulmb bob and Chalk Lines at drop and compression within the expected travel limits. I do not have any tie rod adjustment for bump steer.
Rear trailing arms are set to make the car push on compression, ( ie. outside trailing arm will get shorter) so as not to get loose from rear steer.
The car is almost on the bumpstops now and may hit on compression. BUT, this has not caused problems.
Alignment
2 5/8 Camber.
5.5 Caster
Zero Toe.
The ball joints and the arms are stock. Front Springs are 9 X 5.5 Afcoils with adjustable space. rears are 6 X 5 afcoils with adjustable spacer.
Bushings are Del a Lums front a arms. rear control arms are heims. Panhard Bar has been lowered apromimatly 4 inch and uses heims and is adjustable.
Shock and Struts are Koni Yellow.
Front Sway Bar is the G92 / 1LE
Rear Sway bar is the smallest I could find. Anything bigger and the car will swap ends.
Tires TOYO RA1 275/45/17
Operating Pressure 39 lbs hot
Wheels Vintage Wheel 9.5 X17
Engine Stock w/ t5
Weight 3464.
To me car handles exceptionally well. Mario Andretti may have another opinion. I dont have a skidpad. Or one of those G toys so I can not hypothise a current G reading.
Any comments or suggestions for improved performance or better suspension geometry are welcome and would be highly appreciated.
Thanks.
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