Alignment recommendations please
Thread Starter
Burning Brakes
Joined: Jul 2004
Posts: 1,164
Likes: 71
From: MA
Alignment recommendations please
I just replaced my stock FE1 springs and F45 shocks with Z06 (FE4) springs and Koni FSD shocks. I also have C5 Z06 sway bars installed. I am debating what alignment specs to use and hope that you guys can give me some suggestions.
Here are some particulars about my vette. I have a supercharger installed that probably adds 75 lbs in front of the engine (blower + piping). I am running non run flats. The car is not tracked. I am looking for an alignment that offers good street performance with reasonable tire wear. I also want an an alignment that offers good stability at highway speed.
I can go with the Z06 specs (Front: -.7* camber & .04 toe in, Rear: -.68* camber and .01 toe out) but I am wondering if the added weight of my supercharger would create under steer. I also went to PFADT's website and looked at their "performance street" alignment specs. The main difference between the Z06 specs and PFADT's spec appears to be in the rear numbers. The rear Z06 specs are -.68* camber and -.01 toe out whereas the PFADT specs are -.5* camber and .03 toe in.
What would you guys recommend for my setup?
Here are some particulars about my vette. I have a supercharger installed that probably adds 75 lbs in front of the engine (blower + piping). I am running non run flats. The car is not tracked. I am looking for an alignment that offers good street performance with reasonable tire wear. I also want an an alignment that offers good stability at highway speed.
I can go with the Z06 specs (Front: -.7* camber & .04 toe in, Rear: -.68* camber and .01 toe out) but I am wondering if the added weight of my supercharger would create under steer. I also went to PFADT's website and looked at their "performance street" alignment specs. The main difference between the Z06 specs and PFADT's spec appears to be in the rear numbers. The rear Z06 specs are -.68* camber and -.01 toe out whereas the PFADT specs are -.5* camber and .03 toe in.
What would you guys recommend for my setup?
Race Director
Joined: Apr 2007
Posts: 11,150
Likes: 890
From: South Western Ontario
If you want good highway wear then keep the camber down and get the toe correct - within spec but not too much. Make sure the numbers are equal side to side with the exception of maybe a little more caster in the right front to compensate for road crown. Personally, I'd like to see about 0.4* camber to get good highway tire wear. My rear PS2's went 45k miles with mostly highway driving.
It's possible that toe-out in the rear can cause over steer. I'm not sure how true this is but some of the road course guys will tell you toe out is bad and to use toe in on the rear. My alignment has the toe out and it drives good on the street. It's also been claimed that GM specified a little toe out to compensate for the rubber control arm bushings allowing the wheels to toe in under power. I'm not sure how true this is either.
It's possible that toe-out in the rear can cause over steer. I'm not sure how true this is but some of the road course guys will tell you toe out is bad and to use toe in on the rear. My alignment has the toe out and it drives good on the street. It's also been claimed that GM specified a little toe out to compensate for the rubber control arm bushings allowing the wheels to toe in under power. I'm not sure how true this is either.
