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Author Topic:   Tips for tightening up?
dode
Member
posted June 21, 2003 10:50 AM
Ok, the engine finally runs right thanks to a new carburator, so now it is time to focus on the suspension. We are very loose throughout the corner pretty much, and coming off the track the right rear tire is very hot. This is on a medium banked half mile with a metric car. We run a 1200 RF and 1000 LF. RR is 250 and right now LR is 350. We run about 53% Left side and about 53% rear, with about 50.5% cross. What can we do to tighten this thing up? Is our rear split causing the problem? My choices for rear springs are 350, 250, and 200. I wanted a 300 for the left rear, but the race shop didn't have any. Any ideas? Oh, we run from about 14-16 lbs on G60's. By the end of the race, the RR was up to about 23 lbs. Oh, and we run about 1 inch of stagger on the right hand side. What can I change? I can move weight from left to right and vice versa, but I can't add any more rear without adding more weights (I can do this if needed I guess), I have some different offset wheels, but shocks I am stuck with (carrera street stock shocks).

John

doubletrouble
Member
posted June 21, 2003 11:31 AM
Im not a master a car set up,we sent ours off to have someone set it up but Im willing to bet your rr is hot because of tire spin,the rear spring split seems off,all the bite is on the lr....but then again what do I know.

Ours was set up on the front like yours with the largest tire roll on the fr.Rear springs are 225 &250 with the smallest tire roll on the lr.lf&rr same tire roll.

MOD75D
Member
posted June 21, 2003 12:12 PM
Those springs are a little stiff,except if you have a really heavy car(3500+)it go with the old tried and true 250LR,200RR,that will also help with the wheelspin with more bite off the corner,also to tighten you up quickly try reverse stagger in the rear,it's similar too weight jacking and will show you if you're going in the right direction.


towmandan
Member
posted June 22, 2003 12:09 AM
I agree with Rico, If your having that much trouble tightening the car up take out your rear stagger and try the left rear about 2 lbs more air than your right rear and you probaly dont want to hear this but learn more throttle controle if your gaining that much air on the right rear.....just my opinion....Towman


3xracing
Member
posted June 23, 2003 08:25 AM
I'd start with your rear springs. A 250 LR and 200 RR would be a good start. If it's still loose, then you can go to your 300 on the LR, but 100 LB spring split is alot. Also, on a track that big, you easily could go to 1200 LF and 1400 RF.
What's the rear split? Is it at least 100 lbs? If not, it probably should be. ESPECIALLY if you're running those stiff springs. If you go with the 250 & 200, start at around 80 lbs. (LR 80lbs. heavier than the RR). Cross & rear %s sound good. Might go down just alittle on left %. 52.5%.
Your stagger sounds fine for that track. Maybe even alittle low, but again, those stiff springs are not doing you any favors.
Running any stagger in the front?
What are your ride heights?

I'm assuming this is a 3400lb. Street stock?
Which Chassis?

[This message has been edited by 3xracing (edited June 23, 2003).]

merlinmech2
Member
posted June 23, 2003 10:07 AM
Switch your rear tires from side to side. Will make a big difference though.


Eljojo
Member
posted June 23, 2003 09:59 PM
Is there an echo in there? Soften up those rear springs!


dode
Member
posted June 23, 2003 10:09 PM
Well the car weighs in at about 3450, and we started out with 250 and 200, but we were getting a lot of roll in the turns, much more so than the other cars. I was told that most cars out at our track run 300 and 250, but I don't know that for sure. This is in a class of almost 90% metric chassis cars, which is what we run. Will going back down from a 350 (all that was available at the time) in the LR to a 300 help? What about moving weight, I would want to add left side percent right? Thanks.

John

c21
Member
posted June 24, 2003 09:49 AM
why not try upping your cross (try 52)?

your rear spring split seems high, but it is probably not causing your problem .... I would try that 300 when it is available, but in the mean time ..... add some cross ... if gets a little tight getting in/in the middle ...increase your rear brake bias.

I can't imagine any circumstances where I would reccomend a band-aid as extreme as putting more air on the left than right .... while the higher pressure on the left rear would increase the effective wheel/spring rate at that corner (didn't we already agree the rate was a little high at the LR anyway?) and add to cross as it reduced stagger .... it would reduce the tire patch at the left rear which would translate into reduced traction both forward and lateral .... which would be counter-productive.

increasing your left percentage will tighten your entrance, but loosen your exit. While a higher left would probably be benificial for cornering power ..... you need to figure out if your lack of forward bite is a crossweight issue or a throttle control issue FIRST.

c21

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