jimmymotto

Alright, alright I got carried away with the "5" key. They are 205's sorry, sorry. But I do want to say thanks for the input guys.

r_xplicit

40 rear, 42 in the front......



kumho victoracers......225/50 16 on the stock wheels....

Jims5543

We played a lot with tire pressure. We race two RX-7's in Autocross. A 87 TII with 260 HP and a 87 GXL with 150ish HP. We both started with street tires I had toyo poxes on the TII and the GXL had Azzenas (SP?) We both took a vets advice and we wre running 40 lbs for 3 to 4 events. We were always having traction issues. Another vet was talking to us and knew RX-7's well. He tols us to play with the pressure. He told us to start at 30 lbs and go from there.



I found my optimum setup on the TII with the Proxes. (255/40/17 rear 225/45/17 front)

Front - 30-34 lbs depending on the course and ambiant temp.

Rear - 28-30 lbs.



The GXL seemd to like about 1-2 lbs more front and rear.



We did both the shoe polish and pyrometer (surface temps) when we experimented.







We moved on the Victoracers on the TII and we added camber plates we run 2.5° of negative camber in the front and we have a camber link in the rear and run 2° of camber in the rear. We started with the same tire pressure as the Proxes we did this for a couple of events then got the wild idea to play with the pressure at a practice day.



We ended up running 28-30 front and 26-28 rear. The cars handling changed a lot by dropping that couple of punds out of the Victoracers. Pyro readings were telling us we were right on target with those pressures.



It sucks to have to play with this stuff at an event. Do you have a practice day the day befor the event?? I strongly suggest you go to it and try to sort this out.



I personally would start at 30 lbs. Then go from there. You might find 40 lbs will be better. Welcome to Autocrossing.