ok, im an idiot when it comes to suspension set-up. first off my car is primarily street driven, the only type of track driving it sees in the drag strip.

i run koni yellows with i believe h&r springs(the springs are labeled neuspeed)
the car has 265/40/17 fronts with 285/40/17 rears if that helps

heres my issue. the car feels as though the rear end is 'steering' to the right causing the car to pull left when i accelerate hard when running high boost (600 rwhp) on the track, also at any boost level (350whp) on the street the car consistantly pulls to the left if i abruptly let off the gas after hard acceleration. its to the point where the car is getting dangerious to drive. at highway speeds if i boost through a gear and let off at the top of the gear the car will change 1 lane to the left.

i've changed trailing arms and toe links to pettit racing units, i also have pettit upgraded rear diff bushings. i have not replaced the rear pillowballs yet but i know they are bad (clunking) im not sure if the pillowballs can cause such a severe problem though.

i did notice about a year ago that one of my koni yellows left front to be exact had fluid at the top of the shaft. i checked again recently and see no fluid(mabye it all leaked out?) im thinking that i may have a blown rear shock as well? what do you guys think is causing this problem, and does anyone have any experience with rebuilding koni yellows?
if i get them rebuilt/revalved is there any particular valving i should opt for that would help me in a drag/street set up?

thanks for any input guys..
Roan

 

take your car to get a good alingnment
my car was all over the track going towards the wall
after i did a alignment, it went straight as a bullet

 

I will start with a good alingment , That should take care of it.

 

roan didn't anthoy have a similar problem with the car pulling to 1 side or another while under boost..u may want 2 check with him first to see what's he's done 2 fix the problem..if he fixed it

 

Most important you said that there was a strut leaking. That needs to be addresed first bc if it is shot then you are riding on the spring and that can cause some of the problem that you are having. The fluid in the shock makes it work smooth and even. If it is blown then you have ONE strut that reacts faster and can throw the car off More noticable when letting off the gas bc the rear of the car is unloading. And the dead one unloads faster than the one that is working. Alignment is very important also.

 

the car has had 2 alignments done within 1 week one before instaling the new toe links and one after.

i'm thinking it may be the shocks, but im not sure how to go about a waranty claim with koni since i have no reciept for them.

dj, anthony is still having his problem as well, but its slightly diffrent than mine. his dosent shift when letting off the gas.
any other suggestions? or would a front shock cause all of this?

 

Tire pressure.....

 

an alligment is allways a good way to start but i would start with getting your car to someone who does corner balancing most road race shops can point you in the right direction , i can garantee you that your cars weight is all jacked up and since you mentioned a strut that leaked that itself is gonna shift weight to the oposite tire in an x pattern good luck

 

I though it said a rear shock but either way... a front will def cause the same problem ..but amplified ..
Shocks final answer

 

thanks for all the advice guys, i think ill put my $$ into shocks before pillowballs, i just dont know if its worth spending $$ having truchoice revalve the koni yellows for drag or buy coilovers....
any suggestions?

 

I had the same problem with my old racecar, car would pull from side to side at high boost, you must figure out how to slip the clutch or bring in the boost in stages until the car get rolling.......

 

thanks rotorholic, i wish my issue was too much power but the car has this problem even on low boost 350rwhp
i can fight the power and keep a car straight during hard aceleration and wheelspin, but this is very diffrent its like the car is fighting me back