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Author Topic:   Dirt vs Asphalt
hobby39
Dirt Maniac

Total posts: 112
posted May 07, 2004 06:19 AM  
How is a car set up differently for dirt than asphault?

jay116
Dirt Freak

Total posts: 428
posted May 07, 2004 07:06 AM  
I don't know about that. The car I run was an asphalt car and we left the same setup in it and ran top 5. Car definatley could have won some races if we had as much motor as some of the other guys.

racer038
Dirt Maniac

Total posts: 111
posted May 07, 2004 09:14 AM  
We went from 1/2 mile high bank asphalt to 7/16 mile moderate bank dirt. Switched front springs to have reverse split. Lightened rear springs and kept lighter rear spring on right. Asphalt had 45% rear weight limit, we brought the rear up close to 50% for dirt. That got us in the ballpark.

speedyd1
Dirt Maniac

Total posts: 170
posted May 07, 2004 12:06 PM  
this one is right up my ally. i finished 3rd on a saturday night on asphalt. i took the car to the dirt track the very next day. i changed the tires and pulled the windsheild out at the track and won that afternoon with no other changes. i race both on a consistent basis and the only true difference i can find is in the crossweight adjustments and the rear weights. ive used just about every setup you can name as far as shocks and springs and with or without sway bar and cant really tell the difference. especially if the track dries out by the feature. it darn near becomes asphalt anyway.

Drogo99
Dirt Maniac

Total posts: 120
posted May 07, 2004 12:33 PM  
The only thing we do is adjust air pressure.....we run more on asphalt. Poor boys like us even run grooved tires on the asphalt (not highly suggested)


hobby39
Dirt Maniac

Total posts: 112
posted May 08, 2004 08:48 AM  
So those of you that have been running both you don't make any ajustments to ride height or caster/camber? thanks for the inputs so far.

UNVRNO
Dirt Maniac

Total posts: 136
posted May 09, 2004 08:16 AM  
you must be racing against the worst pavement racers in the world.

on pavement you want as much left side wt as allowed. the wt as low as possible. no more than 48 percent rear on a stock type car.

springs between 650-850 front, a sway bar, and more front brake than rear...

softer tires, a good durometer to shoot for would be 55. less if your track is nice and smooth and easy on tires.

UFnARacing
Dirt Maniac

Total posts: 179
posted May 09, 2004 07:12 PM  
Dude, your going to give UNR a bad name! I can name several racers/race cars that can run top 5 in the two tracks in our area(assuming your in Reno area), with very minimal changes. I ran asphalt last year, switched to dirt this year and didn't change much.

The thing you have to remember, most dirt tracks go dry slick for the main, then a car setup for asphalt is not a bad setup. I'm not saying exactly the same, but real close!

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http://webpages.charter.net/ufnaracing/

speedyd1
Dirt Maniac

Total posts: 170
posted May 10, 2004 12:35 PM  
caster and camber typically stay the same on my car. i might adjust ride height on all four corners if i'm running dirt. i usually move the rear weight a little higher up to increase the roll center heights. if it dries out i use my asphalt setup and do quite well. i sometimes unhook the sway bar for a wet track to get more body roll and then hook it back up later when it dries out. the biggest thing we do is adjust the front and rear weights and the crossweight. we also are restricted to 54 left % at our asphalt track so the whole left side issue is of no consequence.

speedyd1
Dirt Maniac

Total posts: 170
posted May 10, 2004 12:36 PM  
i'll also move the brake adjuster if necessary depending on track conditions.

hobby39
Dirt Maniac

Total posts: 112
posted May 10, 2004 05:09 PM  
thanks for all the replies.

    

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