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Author Topic:   Soft front springs
WesternAuto17
Dirt Full Roller

Total posts: 32
posted May 10, 2001 10:35 AM
My car is about 3400 lbs. and pushes severly in the center of the turn. Its not loose on entry and the exit is about perfect. My spring rates are as follows: RF 800; LF 650; LR 100; RR 175. I haven't scaled the car, so assume that's about right. Compared to other messages posted, my front springs are very soft. I'm wondering if too soft of springs can cause a push. Other messages have said softening the front will tighten the car, but I seem awfull soft already. I have extra 950 and 1150 springs and am thinking of putting the 950 on the LF and the 1150 on the RF, but that should loosen it a lot, correct?

Also, I have about 4-5 inches of stagger on both the front and rear. Will it help it turn to run 0 stagger on the rear and keep 4-5 inches on the front?

The track is 1/4 mile dirt, moderately banked.

jammin
Dirt Administrator

Total posts: 3279
posted May 10, 2001 12:21 PM UIN: 16262997
Sounds like a suspension issue to me. What type of rear suspension are you running?

jammin

#11StockCar
Dirt Roller

Total posts: 17
posted May 10, 2001 12:32 PM
Well, not knowing much of anything else about your car or your driving style. I would say you have too much Cross, first try a shock change on the right front, heavier. run A lot less stagger, try to get the front even, and try only 1 inch on the rear, no more than 3.5 stagger on the rear. And your corner entry is probably way off too. With this new setup, you will need to hotlap and get up to speed more on entry during practice, Fly into the corner as hard as you can without losing it. If the right front shock helps, than yea more front spring. You need to let us know things like toe, type of chassis and tire rule.

WesternAuto17
Dirt Full Roller

Total posts: 32
posted May 10, 2001 01:26 PM
Some more info -- Its a 79 Malibu frame, the rear suspension is stock with a 9 inch. The shocks are RCI racing shocks on the rear and Pro Shocks on the front which are mounted at the lower A-arm and at the cage at the top. Tires are Hoosier Dirts Bosses. I have 2 degrees camber, 1-1/2 caster. I enter the corner in about the middle of the track, its going through pretty quick, but the push in traffic can be difficult to deal with. The push occurs when I'm on the gas.

I'm somewhat encouraged b/c the only chassis change I made over the winter was new shocks (replaced stock-type), but I'm having issues with the motor. So, the past two weeks I've been faster than I ever have been befor in the turns, but the straigtaways are a problem.

What effect does increasing LF spring rate have? Also, I think I could get away with less RR spring. If I reduced it, would that make the push worse? The only reason I think the front is too soft is because of what I've read on the forum, but I'm curious what putting the heavier springs would do, because if I do that, it will be a big change.

How would decreasing the crossweight percentage lossen the car?

#11StockCar
Dirt Roller

Total posts: 17
posted May 10, 2001 03:42 PM
Ok, which shocks not just brand, but which ratio. I would definetly say you need to scale it, your percentages are just a guessing game without something to go by. If you have too much cross, the car pushes going in and will be loose in the middle or off the turn. If you are making a long arching entry, then the car may push in the middle of turn instead of start of turn. I made the same mistake on my street stock, thinking that I had to have a big rf tire for cross, the problem was the car only handles half way decent in dry slick and not good on tacky or wet. I have allway's been told your initial setup should be straight up on the front and 1 inch to 1.5 inches in the rear, for this type of car. I would increase my caster some, there are some general rules in setup here that seem a little off. I would think you need a little more spring on the front and there is too much gap between the two front springs, try the 800 lf and 950rf before the big jump, and the rears seem a little light to me as well, but I have never ran a Metric. Remember Start with a good basic setup and make small adjustments from there. Anybody?

[This message has been edited by #11StockCar (edited May 10, 2001).]

[This message has been edited by #11StockCar (edited May 10, 2001).]

poboy2
Dirt Forum Racer

Total posts: 95
posted May 10, 2001 06:05 PM
Your rear split sounds odd to me. 100 LR? Is that correct. I would try a 200 in the LR and leave the 175 in the RR. It might however tighten the car up on exit.

PEDDLER
Dirt Maniac

Total posts: 148
posted May 14, 2001 06:55 PM
Ya Know 17, we run alot stiffer all the way around on a car with the same weight.Depending on the driver preference we run as follows;
lf 1000 to 1200...........rf 1200 to 1600
lr 175 to 250.............rr 175 to 250.
I know the rear looks weird but some like a soft RR and some like a stiffer RR. On my SS we ran the following.
LF 1200...........RF 1600.
LR 200............RR 250.
On a 1/4 mile semi banked clay with a 3450lb 82 Cutlass.
I hope this helps and don't confuse.

The Peddler

racer17j
Dirt Maniac

Total posts: 165
posted May 15, 2001 01:04 AM UIN: 54865418
i would put the heavier spring on the front the one you have now would work on a 2500# modified but not a ss.i would also get a 200# lr spring instead of the 100 run 0 stager on the rear and about 3-5 on the front hope this helps i'm not expert but it seems to work on my car

Pigpen
Dirt Roller

Total posts: 17
posted May 22, 2001 10:52 PM
I had the same problem on my ss, found out that the right front was bottoming out because the spring rate was to soft...causing it to push only on entry... Pigpen

WesternAuto17
Dirt Full Roller

Total posts: 32
posted May 23, 2001 10:22 AM
Here's my new numbers 900 LF and 1000 RF. It drives a ton better. The push is still there if I drive low, but it is much better up high.

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