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Author Topic:   Converting Asphalt Street Stock to Dirt?
tigeraid
Dirt Roller

Total posts: 6
posted September 23, 2005 12:40 AM  
So I went to Ohsweken last weekend for the SOS race, which was fantastic, and also enjoyed the other classes as well. I used to race up at North Bay Speedway on asphalt before the track closed, and while I wasn't planning on getting back to racing so soon after moving to London, the bug hit my buddy hard and now he wants to go.

I'm still deciding wether we should start with a fresh car or grab one of our old racecars from up north. We raced on a 1/4 mile asphalt track with about 15 degrees of banking. Ohsweken is a 3/8 mile with the same banking, but is also really wide. I have no real experience setting up a dirt chassis, and the rules don't allow weight jackers, control arm interchange or anything else really... but they do allow inexpensive shock changes, and any spring we wanna run.

So I'm wondering what kind of obstacles I'd encounter modifying one of our old chassis for dirt in this class. Do I just hafta change around the spring rates and hope for the best? What's different in the overall "theory" for a dirt track car as opposed to asphalt? Are the spring rates at each corner significantly different, for example?

Thanks!

mike9
Dirt Full Roller

Total posts: 72
posted September 23, 2005 06:33 AM  
I race in a class based on a gm metric chassis and we run both asphalt and dirt tracks and honestly the only changes we make is change tires we dont even touch the wieght jacks an asphalt setup is very similliar to a dryslick track setup

Speedway65
Dirt Freak

Total posts: 344
posted September 23, 2005 12:14 PM  
We race a Street stock at Ohsweken Speedway,this is our setup lf-900 rf 1100
lr-225 rr-200 this is with the Hoosiers.If you need any more help just email me with your questions.We run 2 cars at the track here is one of them. http://www.rickwellmanphotography.com/Ohsweken/july1/pages/IMG_0048.htm
Jeff
SS24a@hotmail.com

[This message has been edited by Speedway65 (edited September 23, 2005).]

tigeraid
Dirt Roller

Total posts: 6
posted September 24, 2005 12:44 AM  
hey thanks Jeff, good to see the racers down here are open to sharing setups like up North ...
I'll definitely keep you in mind if I need any help with baseline setups... but mike9 isn't the first guy who mentioned using the same setups for both tracks...

But sure enough, you have a really strong l/f spring rate... I guess you DON'T want too much weight on the l/f going into the corner? Just seems odd, on a relatively tight radius short track like we raced on, we focused a lot on getting weight onto the l/f on entrance, and just ran a fair bit of rebound to get the *** to hook up on exit... I think I got a little to learn about dirt track heh

racer17j
Dirt Forum Champ
Total posts: 5390
posted September 24, 2005 09:21 AM  
Well I certainly understand the difference with driving, and that's obviously something I'll have to learn... and ya I did notice the cars sitting higher...

Speedway65
Dirt Freak

Total posts: 344
posted September 26, 2005 08:02 AM  
Our other car uses a 900-RF and a 800LF same on the rear as the other one.Both cars do not use a swaybar.

OvalRocket34
Dirt Forum Racer

Total posts: 81
posted September 28, 2005 06:21 AM  
I still think very little has to be done to a car to change it over. Change your gears and go racing. We took an asphalt car straight from it's track to the dirt, never did anything to it but put new shocks and springs in the front (same rates) because the old ones were shot. Car was a top 5 car without ever touching it. Car could have easily won but Camaro's are just the dominant setup down here, 2 metric cars have won a race in 4 years.

Speedway65
Dirt Freak

Total posts: 344
posted September 28, 2005 07:02 AM  
We only have a few leaf cars so metric's rule up here.Our 1 car won 6 features this year alone!

mike9
Dirt Full Roller

Total posts: 72
posted September 28, 2005 07:27 AM  
i agree with oval rocket because we race both type tracks and run extremely well on both and this is with the exact same setup , just change tires

tigeraid
Dirt Roller

Total posts: 6
posted September 28, 2005 02:09 PM  
I think I'll be starting that way, ya... but we run a significantly softer spring in the l/f than you guys apparently do, so I guess that's one change we'll have to do...

mike9
Dirt Full Roller

Total posts: 72
posted September 28, 2005 07:52 PM  
i run a 3066 pound metric chassis with a 750 left front a 800 rt frt a 150 left rear and a 125 rt rear of course this is with a sway bar on both dirt and asphalt an it works great

    

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