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Author Topic:   help on tire pressure setup -- baseline
ssanto
Dirt Roller

Total posts: 11
posted August 20, 2002 01:12 PM
I've just got my car together... '82 chevy malibu. Stock springs, new shocks (stock replacement). Four post cage. No weight added. 350 motor. Weight should be about 54% on the right, 50% cross.

There isn't really much I can do to the car right now as far as setup. This will only be my second race so I'll probably need to learn how to drive it before I start tinkering with the setup.

But I'd like some idea as to where I should start with tire pressure. I'm running DOT tires, same size all the way around. The track is tacky with a medium bank.

Thanks,
Sal

uforacing51
Dirt Freak

Total posts: 349
posted August 20, 2002 01:44 PM
I think you will find that you may need to play around with the springs a little to get the performance out of it you want. I bet if you look around you will find out others have. but if you can be competitive with all stock parts, fantastic. I run DOT tires also and have found the Weathermaster to be a really good tire, others have said anything cooper makes is good on dirt. I would put tubes in the RR. I pulled three off the rim in one night without tubes. I run them in the RF sometimes too, but not in the left side at all. Pressures are
RF - 17
RR - 16
LR - 15
LF - 15

PS Good choice of car by the way.

[This message has been edited by uforacing51 (edited August 20, 2002).]

Dunbar
Dirt Maniac

Total posts: 119
posted August 20, 2002 02:53 PM
Lets first go about the springs. If you can get good performance out of stock springs congrats.lol.. but I'd go and order afco springs from midwest motorsports........... 1-800-262-5033. I run a lf 1000 rf 12000. my rear springs come from day motor sports lr 250 rr 200. make sure you measure the height of your springs before ordering. Just cause those springs work for me dont mean they'll work for you plus i run a half mile with a 77 buick. Tire pressures are lf 16 lr 15 rf 18 rr 18. I also run tubes in all my tires besides my beadlocks and my 2" offset wheel that goes on my left rear. Tires I run the winston winners and star fire. I've never tired the cooper cobera but I hear there a good tire but I like my star fire and winston winners. Also get some pro shocks or even some afco shocks they run for about $50.00 a shock. Good Luck

ssanto
Dirt Roller

Total posts: 11
posted August 20, 2002 04:02 PM
thanks for the advice. I'm already running tubes all the way around. Since this is my first time racing and there are only a few races left, I'll probably wait till next season to start getting competitive with the setup.

thanks,
Sal

jpm
Dirt Newbie

Total posts: 3
posted August 24, 2002 12:25 PM
i have same question for same car but with mod tires.

fairlaniac
Dirt Full Roller

Total posts: 74
posted September 04, 2002 11:23 AM
Why does everyone run less that 20 pounds of air in the LF? We run about 25 in the LF and are pretty much with everone else on the other three corners. Not sayiny we know what we're doing but the LF does not seem to build pressure. At least on our car.

------------------
Doug
Ford Guy Workin' on a... gulp, Chevy!
"Lift for a second, that's where you finish!"

uforacing51
Dirt Freak

Total posts: 349
posted September 04, 2002 04:37 PM
because if you have the caster and camber set correctly, the left front tire is as important as the Right. this is assuming the rest of the car is set up correctly too!!

fairlaniac
Dirt Full Roller

Total posts: 74
posted September 04, 2002 09:47 PM
What is "set Correctly" concerning the caster and camber? I'd be interested in your opinion. The way we came up with base line air pressures was as follows. Using Firehawk SS220 tires we ran a 200 lapper, had to pit so we adjusted the air again, ran the remainder of the race and the car handled pretty well. We measured the tire pressure hot, then we let the tires cool over night abd measured the pressure cold. We figure that if we start at the cold pressure that we determined, the temp under race conditions would climb up to the point were the car worked last time. The LF hot was 27 and cold was 25, so we start that one at 25. Good thinking or not?

------------------
Doug
Ford Guy Workin' on a... gulp, Chevy!
"Lift for a second, that's where you finish!"

uforacing51
Dirt Freak

Total posts: 349
posted September 05, 2002 08:50 AM
If I remember correctly, the RF is at 3-4 degrees of positive(?) camber and the LF is at about 2 degrees negitive camber. I then shim the tires to have the RF ahead of the LF. Our rules say we can't have a "visible" lean to the tires, so I don't use as much as some cars I have seen do. I can see the RF leaning thou and so far nobody has thrown a fit... yet! It is kinda hard to get negitive camber in the LF with the upper a arm mount in the stock position, but if you use a part I got from car quest (can't remember the number) but its is the arm that bolts to the car and is pressed into the a arm with the rubber mounts on the end, it will allow you to pick up some negitive camber. Hope all this helped someone.
Oh yea, the idea you have for the LF, if it works for you, hey go with it. I run lower preassure because thru the years I have determined that I can run the LF at a lower pressure and it does just fine. its a quick and easy way to get stagger too.

[This message has been edited by uforacing51 (edited September 05, 2002).]

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