Visit The Dirt Forum for More Information

Author Topic:   rear end springs
maximus
Dirt Roller

Total posts: 21
posted September 06, 2005 02:49 PM  
I have a 87 Buick regal with setup as follows. lf 970lb, lr 760lb, rf 880lb, rr 770lb. left side 51.1% right side 48.8%, cross 48.5%. my rollout is 88.5 inches on rf and rr, and 85.5 inches on lf and lr. My tire pressures are rf 20, rr 18, lf 15, lr 21(I cannot run beadlocks). I am running 1200lb spring on rf and 1000lb on lf. My rear springs are stock. the car setsup great in the corners but is a little loose coming out. I run on a 1/4 mile semi banked track. Any advice on rear springs or setup info would be greatly appreciated. (I know season is almost over but I am trying to get ready for next year.)Thanks.

cd2
Dirt Maniac

Total posts: 161
posted September 06, 2005 03:10 PM  
maximus
Change the rear stagger to 1 1/2" & bring the crossweight up to 50% if the car drives in of & still a little loose off add more C.W. if it goes in good & is tight off take a little C.W.out.
cd2

sc1 racing
Dirt Freak

Total posts: 419
posted September 06, 2005 03:13 PM  
drop left rear pressure will definatly help..

why do you run more in l/r than r/r?

maximus
Dirt Roller

Total posts: 21
posted September 06, 2005 06:01 PM  
Thanks for the advise guys. To answer sc1 questions I was told to increase air pressure in lr and decrease in lf to fight a loose condition. When I dropped the air in lr below rr the car runs real loose. the actual tire sizes are 275/60 15 and 255/60 15 so what size tire do I need to get the 1.5 stagger?(Do they make a 265/60 15?)

cd2
Dirt Maniac

Total posts: 161
posted September 06, 2005 06:59 PM  
maximus
All i can tell you on the street type of tires you run is jack the rear of the car up let the air out of the tires & measure around them with a tire tape.Go to where ever you get your tires & take some measurements & see if you can find a tire that will work.Either bigger for the L.R. or smaller for the R.R.If the track is real dry slick you might want to even the rear up.
cd2

o5racer
Dirt Freak

Total posts: 402
posted September 07, 2005 07:48 PM  
Your rear weight is low and you are running more right on the right rear than the left. Try to get the rear weight up near 50% and shim the left rear to get some more rear split(more weight on the left than the right). 50 to 100# would be a good starting point.
Nick

maximus
Dirt Roller

Total posts: 21
posted September 08, 2005 09:00 PM  
I did some research and found that a 225/70 lr and 275/60 rr will put my rear stager at 2" and I have also taken out the stock springs and installed 225lb lr and 175lb rr. I will try what o5racer said about the rear split but I don't know how I going to get more rear weight without adding it. I'm going to practise tomorrow and will let you guys know how it does. Thanks again.

CLBaker25
Dirt Maniac

Total posts: 193
posted September 09, 2005 07:53 AM  
In general if you car is loose off the corner one of the first things you can do to tighten the car is to reduce the amount of stagger. Probably part of the reason it seems like the left rear wants more air is because the more air you put in the left rear the more it reduces your stagger. I would go with the same series of tires and then you could use the air pressure that you need. (a couple of pounds lower on the left side than the right and that would also give you the stagger that you are looking for since you would be airing up the right side tires more than the left)

Also the more even you get your rear tires as far as sizes the more bite that you will get into the car. The same oposite it true in the front the more stagger you use the more bite the car will have in it.

[This message has been edited by CLBaker25 (edited September 09, 2005).]

Back to the Archives