[nova_kevin]

We Have a 80 corvette with irs the updated rearend is out of a 1999 zr1
our problem is this.....everytime we leave on spray the cars make a hard left turn , we tried a delay box and when it hits it just makes the car turn way more violently , oh yes i guess i should say that we have about 1200 bhp
to the rear wheels on spray , other then going solid axle can there be a remedy to cure this ,
DOES ANYONE HAVE IDEAS ??????

[coldknock]

You need to take the car to a chassis builder with a good reputation. Nothing anyone can tell you on here will make IRS+small tires+heavy car work with 1200hp.

Larry

[henny496]

Hello Kevin
Do you have an anti roll bar in it? Have you done a baseline on your chassis for dimensional tolerances?
take care
Tom

[nova_kevin]

Thats funny , cause thats exactly what the chassie shop says
, the irs was removed today , semi tub to be in by the end of the week , i hope it helps this vette go straight , if it dont he's gonna have to back half the car i'm sure thanks to you guy's for your words of wisdom ...Kevin

[Triaged]

This might (or might not) help.
http://www.hotrod.com/techarticles/1...rs/index3.html

[johnsongrass1]

If the car goes left you need to add either static or dynamic weight to the left side to counteract the tendency for the RR to do more work than the LR. Adding more weight on the LR might help(static lead) or adding it dynamicly by adjusting the Caster/Camber/Toe to get more LR forward drive. What adjustment's can be made on your paticuler setup? Can you move the upper A arm mount's?

[38Chevy3WCoupe]

Here's another good article that may help.

http://hotrod.com/techarticles/34238/

You also might want to check out corvetteforum.com

[Triaged]

Originally Posted by 38Chevy3WCoupe

Here's another good article that may help.

http://hotrod.com/techarticles/34238/

You also might want to check out corvetteforum.com

I don't think that article will help much.
This is a quote from the article

Vehicles with an independent rear suspension do not exhibit weight transfer at the drive tires. The torque from the driveshaft into the differential is counterbalanced because the differential is fastened to the chassis, as are the engine and transmission. The action and reaction of the torque is contained by the chassis and no torque generated weight transfer occurs.

[johnsongrass1]

True but the engine does change things up fron that will relate to adjustment's made in back. The engine twisting in front will cause the back of hte car to twist the opposite direction. Loading the RR tire when the LF lift's from the resistance of torque.

Are your sure you diff is providing equal torque to both rear tires? With that much power you may want to go with a locker or better yet, a spool.

[Triaged]

Originally Posted by johnsongrass1

True but the engine does change things up fron that will relate to adjustment's made in back. The engine twisting in front will cause the back of hte car to twist the opposite direction. Loading the RR tire when the LF lift's from the resistance of torque.

Are your sure you diff is providing equal torque to both rear tires? With that much power you may want to go with a locker or better yet, a spool.

So you think the problem is the chassis twisting? I guess I could see how that could happen with that much HP I was assuming that there would be a full cage tied into the frame that would reduce that...

[nova_kevin]

you guy's are pretty smart , and i dont why i didnt think of that my self , i think i should have payed more attention to the dynamics of alignment in school huh , that'll teach me huh ..haha thats ok i got you guys now
Kevin