...ok for those of you that have never seen me post, I crew for my buddy's car here in the UK. It is a Vauxhall Tigra running 2000cc engine, GT35 etc, makes 520bhp at present (aiming for 650+ in 2010) - at present we run the car with the rear suspension adjusted basically as high as it will go - coilover wounds all the way up and a 2-3" alloy spacer block between the bottom of the coilover & the rear suspension mount.
When we originally fitted the blocks and wound the suspension all the way up the 60ft's dropped from 2.0-2.1 straight to 1.9's & 1.8's - car is now doing consistent low 1.8's and occasional 1.7's.

Looks like this:



We know we have a problem with the front end lifting under acceleration - the camber etc has been adjusted to suit approx 1" lift but I suspect it lifts a little more than this.

Now my question is this: I have seen on here that most of the turbo FWD guys seem to keep the rear suspension fairly low - are you all running some sort of super trick suspension or is there a particular reason for it?

The season is over for us now so until we can get to a test day next year we want to think about every possible thing we can to get the car down in to the 9's before anyone else over here

Thanks!

 

I don't think raising the rear improves 60ft times.its all about physics.google is your friend.read about suspension compression/rebound,wheelbase,traction bar,etc..

 

Anybody else?

Looking for direct experience rather than internet theory tbh!

 

raising the rear can and does indeed often help traction on a FWD , read up on corner balancing and you will see that by raising the rear you are putting more of the cars weight on the front.. however to do it properly you need to use a suspension that fights front light and rear squat. one trick you can look into if suspension isnt available for your car is limiter straps, by strapping the front down it wont be able to lift any more.

 

also what spring rates are you running in the rear? seems like a really stiff rear spring helps