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Author Topic:   car setup
race33
Dirt Full Roller

Total posts: 44
posted March 02, 2004 07:03 PM  
How do you go about getting good information about setting up a car such as tire pressures for tacky vs. dry slick, stagger and what is correct, ballast placement, what is wedge and what does it do, etc. I am fairly new to dirt racing and am eager to learn what I can. I have tried it at the track, but not with great results. Other drivers have given suggestions, but not always accurate or worthwhile. Any help would be appreciated, even just a starting baseline setup that I can begin with.

JRB13
Dirt Forum Racer

Total posts: 80
posted March 02, 2004 07:14 PM  
WHAT KIND OF CAR DO YOU HAVE AND HOW MUCH DOES IT WEIGH.

race33
Dirt Full Roller

Total posts: 44
posted March 02, 2004 07:32 PM  
73 Chevelle, 3200 lbs., 215/70/15 max tires, with 350 on a 3/8 medium banked track. It pushes heavy through the turns, loose on exit.

racer17j
Dirt Forum Champ
Total posts: 5390
posted March 03, 2004 08:26 PM  
I am running stock springs and shocks. The tire pressures are 19lr, 22rr, 24lf, 26rf.
Tires are 215/70/15. I have no ballast in the car. No, I have not done an alignment on the car.

Flanndad
Dirt Freak

Total posts: 255
posted March 04, 2004 09:26 AM  
First thing is do alot of reading on this site, query on the springs, scaling and shocks and other things.
Also the Steve Smith AutoSport Books are great examples also.

You really need to get the proper racing springs, ride heights set, stock mount racing shocks.
Then gut everything you legaly can, after that you need to get the car scaled. This will determine where to put the weight.

Alot of the guys running the upper classes at your track will have scales, ask around someone will do it fairly cheap, a $100 or so.
Approach them right they don't want junk running around the track, crashing and making their night longer either.

racerman707
Dirt Freak

Total posts: 374
posted March 04, 2004 09:51 AM  
Check out circletrack.com and search the articles that might help you.A lot of articles I have found dont help my car straight out but at least it gets you thinking in the right direction.

race33
Dirt Full Roller

Total posts: 44
posted March 06, 2004 06:45 AM  
When I first built the car, I had it scaled. I haven't done it since, but it should be close to these numbers. lf 804, rf 869, lr 689, rr 592. left 52.3%, cross 51.7%, rear 43.8%

racer17j
Dirt Forum Champ
Total posts: 5390
posted March 06, 2004 10:22 AM  
Will adding lead to the lr help increase the rear %?

racer17j
Dirt Forum Champ
Total posts: 5390
posted March 07, 2004 08:31 AM  
Thanks for the suggestions. My seat is all the way back, and our track rules don't allow batteries in the trunk, so it is behind the seat. I ususlly do keep the fuel cell full, but it's only a 12 gallon tank. I will try adding weight over the rear axle. I have a 50 lb. weight I can try. Also, what air pressures do you typically run on a tacky and dry slick tracks?

racer17j
Dirt Forum Champ
Total posts: 5390
posted March 07, 2004 02:27 PM  
Thanks, I also went through my tires and put 2 inches more stagger on the right side. Will this help with my push problem as well?

ohiodirt
Dirt Full Roller

Total posts: 68
posted March 07, 2004 03:44 PM  
adding stagger across will DEFINITELY help your car turn. i went out last season and was all over the place. changed one rim offset and stagger and wow....it was like a different car. good luck!

racer17j
Dirt Forum Champ
Total posts: 5390
posted March 07, 2004 05:12 PM  
I put the added stagger on the RF. Should I also do it on the RR to bring the entire right side up?

dan ferry
Dirt Maniac

Total posts: 183
posted March 07, 2004 09:26 PM  
if the car is pushing take stagger out of the front dropping the left front adds lr and tightens car. only run enough rear to get the car to work too much rear stagger will make car loose coming off. are you running a sway bar on the front or rear? how much syagger were tou running in front and back rhe rear oercent you had isnt gonna cause the push. if you get more rear percentage without fixing the push it may and will get worse. dont go changing alot all at once or you wont learn anything.to start id say run front even or close to it and at most 2" in rear. you need to align the front end!!!! the proper front end setup the car will turn on its own.(so to speak) if you need settings ill send

race33
Dirt Full Roller

Total posts: 44
posted March 08, 2004 06:08 AM  
Thanks, Dan, for the info. Yes, please send me the settings. That will let me know what I need to change.

race33
Dirt Full Roller

Total posts: 44
posted March 09, 2004 07:11 PM  
Is it better to drop the LF or add to the RR? Or, does it matter either way?

dan ferry
Dirt Maniac

Total posts: 183
posted March 09, 2004 07:21 PM  
if your talking putting bigger tire on rr to accomplish same thing as smaller tire on left front which increases left rear bite and tightens car then no it wont and i wouldnt do it itll add stagger to rear making car turn in easier but the trade off is loose coming off. i like to use front stagger and wheel offsets to adjust car 2' on right front loosens car and helps going in also on a metric with the tires you run id avoid rear stagger if u can get it to turn other wise. if you were running the late model tires on your street stock like we can very different tires have alot more bite and need a little help turning with locked rears.

race33
Dirt Full Roller

Total posts: 44
posted March 09, 2004 07:34 PM  
So it looks like the best for me right now is to lower the LF stagger 2" and leave all the rest the same. This weekend will probably go dry slick and this is when I usually have a bad push.

dan ferry
Dirt Maniac

Total posts: 183
posted March 09, 2004 08:21 PM  
you still never said if you run a sway bar on car front or rear? if the car pushes mostly dont increase front stagger decrease it. loose on exit after your bad push is probably result of you trying to correct the push while driving. try to get rid of the oush before worrying about loose off.

shay
Dirt Roller

Total posts: 18
posted March 10, 2004 02:27 AM  
Hi Dan.Sorry to **** in on a thread.So if i use a 2 inch offset on left rear instead of a 4 inch, will that tighten it up, or loosen it up .I hear 2 total diff things, so want some more opinions.Does a 2 inch off on left front over a 4 inch, loosen , or tighten a car.Just looking for info.Thanks Dan....TH.

race33
Dirt Full Roller

Total posts: 44
posted March 10, 2004 06:12 AM  
Dan, I don't run a sway bar front or rear. I will try the setup you suggest this weekend and let you know the results. Thanks.

cozmo
Dirt Forum Racer

Total posts: 99
posted March 10, 2004 09:34 AM  
When I ran a 71’ Chevelle (stock everything on the suspension)I ran 15 lr, 20 rr, 20 lf and 18 rf tire pressure; with no stagger. We had to run 215/70r 15 recaps with tubes. Ran the front stock sway bar with 1” of slack, a 20 gal fuel cell; full and the battery behind the seat. Set the toe ½” out; the rf -1” camber and the lf at 0. Never scaled the car; should have. In my car I found that the deeper you ran into the corner the better it handled, you baby it your out to lunch, it wouldn’t roll over and push. I won two features, 8 top fives and 3 top 10s that year on a ¼ mile semi bank with that set up; only ran 12 races that year. But I am not saying the set up is right. I would only make 1 or 2 changes at a time. Good luck.

dan ferry
Dirt Maniac

Total posts: 183
posted March 11, 2004 07:47 PM  
2' on left rear will loosen up car 4" will tighten it. 4 on left front with same size tire will loosen car. i try to run 3" all the way around and add 2" to right front if need to loosen car or 2" on right rear to tighten car. when using offsets the the right front and left rear work relatively the same like 2" will loosen and 4' will tighten lf and rr work the same as each other but opposite the rf and lr 4" loosen and 2"tighten i hope i explained well enough to not confuse you.

dan ferry
Dirt Maniac

Total posts: 183
posted March 11, 2004 08:01 PM  
keep in mind when changing wheel offset wnd that different rim has a different tire on stagger may change and you may not get the results you are looking for. i check and record roll out of all my tires at the same pressure helps decide where on car i can put them.im sure we all do just makin sure.

racerguy500
Dirt Maniac

Total posts: 168
posted March 11, 2004 08:48 PM  
Just another question for you, is the rear end locked or open? A locked rear will cause a push if you have no stagger on the rear. Especially on a dry track.

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