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Old 04-18-2009, 08:08 PM   #1
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Rcomp tire pressure and camber

What tire pressures u running in ur Rcomps and for what situations?? High speed? Cornering? and what degrees of camber are u running?


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Old 04-18-2009, 09:49 PM   #2
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What tire pressures u running in ur Rcomps and for what situations?? High speed? Cornering? and what degrees of camber are u running?
Tough question to answer because different manufacturers have different recommendations.

Add to that the difference in compounds. I'm not trying to be evasive, but rather to tell you there are many factors - including driving style.

I run exclusively Hoosier tires. I've had the most success with them, but have run other brands as well (BF Goodrich, Kuhmo, Goodyear).

Hoosier A6 (DOT Autocross): 30 PSI Front, 32 PSI Rear

Hoosier R6 (DOT Track Tire): 32 on all 4 corners

Hoosier Grand Am (Full Slick): 28 Front, 30 Rear

CAMBER:

-1 Degree on all 4 corners (I run in the stock classes)
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Old 04-18-2009, 09:52 PM   #3
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Why more air pressure on the rear?
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Old 04-18-2009, 09:57 PM   #4
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Why more air pressure on the rear?
To induce more rotation/oversteer in the rear.

Without an LSD, I could spin a front wheel and lose time in a corner. By increasing the rear pressure slightly, I get the rear to hang out while hammering down.

Weather changes the equation as well. Hot days, I may add only a pound or two or I amy set all 4 tires at the same pressure and just see what happens.

My original post is really a baseline.
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Old 04-18-2009, 10:01 PM   #5
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I ran 28 lbs front and rear in my A048's. I know that there are different compounds to deal w/ and thats y i said for more of a low speed cornering track, definitely not high speed. I have a lsd and large RSB, so i don't need to run heavier rear tire pressures. but i was under the impression that you were supposed to be around 25 psi or so.
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Old 04-18-2009, 10:08 PM   #6
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I run in the stock class. So, I am limited in what I can do relative to suspension modifications.

With the larger RSB, you have increased rotation - so much so that I would recommend that you DROP the rear pressure below the front just to maintain stability.

It's a personal preference, but I like a car to be more "neutral" in handling. It's easier (for me) to compensate for during quick transitions (i.e high speed sweepers) vs. having to reign in the back end (We can drift our cars with some effort).

IN a RWD car, trailing throttle oversteer is a hall mark (or should I say HAUL) mark of speed, but it tends to bite with negative effects in FWD cars.
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Old 04-18-2009, 10:17 PM   #7
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I never had a problem b4, my car is decently neutral w/ the A048's, now w/ the v710's, i'm curious how this is going to turn out. I have the 24 mm and 28.6 mm sway bars. its pretty good for handling. I will also be running a lot of negative camber w/ this setup.
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Old 04-18-2009, 10:22 PM   #8
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More negative camber = more better.

The V710 is a good tire and a little more durable than the Hoosier.

I would play with your tire pressures in 1 LBS increments to start with and get to where you are most comfortable
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Old 04-18-2009, 10:25 PM   #9
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ya, i'm gonna start on the same setup i had as before i think. then go from there. that way i can use it as a baseline for comparison.
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Old 04-19-2009, 12:04 PM   #10
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does no one else run Rcomps???
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