FD - Camber adjustment based on tire temps

rx4ur7 · 07-07-2009, 01:57 PM

Toe set at 0? What are your pressures hot? Is there good roll over, are you using up to the tread markers or past them. Those little triangles that are located around the tire.

With the readings you show, which do seem low, it would seem that your pressures are right and that you might drop the camber .05 to 1 degree. I would try more air in the fronts or less in the rears. Haven't had a lot of exposure to the Kumhos for racing. Yoko, BFG, and Hoosier where the hot ones back when I was running DOT tires. If changing the air pressures doesn't do anything and you have adjustable shocks stiffen the rears or soften the fronts. But only do one thing at a time.

My suggestion for you is-
1 - Try equal pressures,
2 - change camber until you get even temps.
3 - If you still have understeer, soften front or stiffen rear.

How are your lap times compared to the fast guys?

When we were running the Firehawk and Toyo cars we ran same pressures on all four. The cars were all balanced and were 50/50.

jkstill · 07-07-2009, 02:32 PM

Quote:

Originally Posted by rx4ur7

Toe set at 0? What are your pressures hot? Is there good roll over, are you using up to the tread markers or past them. Those little triangles that are located around the tire.

Toe is 0.
Pressures were measured after I got out of the car.
As per reply in another forum, I will try to get someone to measure them ASAP next time I run.
Using the tire up to the edge pretty well I think, but I will take a closer look when I get home.

Quote:

With the readings you show, which do seem low, it would seem that your pressures are right and that you might drop the camber .05 to 1 degree. I would try more air in the fronts or less in the rears. Haven't had a lot of exposure to the Kumhos for racing. Yoko, BFG, and Hoosier where the hot ones back when I was running DOT tires. If changing the air pressures doesn't do anything and you have adjustable shocks stiffen the rears or soften the fronts. But only do one thing at a time.

Going to try the camber first.
Following that I may put the .120 bar in the TriPoint sway bar, as the .180 just seems too stiff during cool weather.

Quote:

How are your lap times compared to the fast guys?

I thought I was one of the fast guys that day, 6th overall.

1.9 seconds behind FTD (very fast 914-6) and , .8 seconds behind 2nd through 5th place, which were all within a 10th of a second.

I've made progress getting closer to that group, and trying to eliminate that .8 second gap.

07-07-2009, 01:57 PM	#1
rx4ur7 Rotary since 1972 Join Date: Nov 2008 Location: Tucson Posts: 231 Rep Power: 17	Toe set at 0? What are your pressures hot? Is there good roll over, are you using up to the tread markers or past them. Those little triangles that are located around the tire. With the readings you show, which do seem low, it would seem that your pressures are right and that you might drop the camber .05 to 1 degree. I would try more air in the fronts or less in the rears. Haven't had a lot of exposure to the Kumhos for racing. Yoko, BFG, and Hoosier where the hot ones back when I was running DOT tires. If changing the air pressures doesn't do anything and you have adjustable shocks stiffen the rears or soften the fronts. But only do one thing at a time. My suggestion for you is- 1 - Try equal pressures, 2 - change camber until you get even temps. 3 - If you still have understeer, soften front or stiffen rear. How are your lap times compared to the fast guys? When we were running the Firehawk and Toyo cars we ran same pressures on all four. The cars were all balanced and were 50/50. Last edited by rx4ur7; 07-07-2009 at 02:29 PM.