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Torque steer under hard acceleration

Suspension and Steering

Vehicle Information: Model: 911 Carrera; Year: 1987; Body Type: Coupe; Engine (type, size, modifications): 3.2; Total Mileage: 99,000;

Hi Chris, I have been tracking my 1987 911 with limited slip for about 7 years now. I started club racing last year and switched to Hoosier S03/04 race radials at that time. I have been through about 4 sets now and have been very happy until last weekend when I noticed pretty significant torque steer when moving on and off throttle, shifting, etc with a new set I purchased from Hoosier at the track.I never noticed this before using these tires, I have with street tires. I swapped back to my practice set (S04s) and didn't seem to notice this phenomenon, but I am now beginning to second guess myself. I complained to Hoosier when I noticed that one of the rear tires was 5/8 of an in larger in circumference. They replaced one of the rears (larger) to bring it closer to spec and I thought this would fix the problem (they now measure within 1/8 inch mounted). The same problem occurred with the new rear during my sprint race. I swapped sides and the same thing during my enduro. You can even see the "sawing" of my front end as I shift in my video. Not a good sensation when you have other things on your mind. I run 225/45/17 and 245/40/17 on Fikse 7.5 and 9. Power is about 255 at the crank and the suspension is very stiff. No suspension pieces seem to be broken. Obviously I must test again with my practice set to carefully evaluate if it happens with them. Otherwise, could my limited slip be failing? Could this cause torque steer like this? Could the front tires be causing this? With the car on jack stands, in neutral, the rears should spin in the same direction for limited slip I believe. Is this also true when in gear? Is this enough to evaluate the health of the limited slip?Thanks for any help.Kurt Konrath1987 911 PCA D prepared

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