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Author Topic:   spring rates
kruff75
Member
posted April 25, 2000 01:54 AM
i have a 2800lb car and i cant get any traction comeing off the turn. I need some help with the spring rates. I have a
lf=650
rf=850
lr=200
rr=150

the shocks are 76 front and 95 rears
i run a 1/3 mile semi banked d shaped oval
can somebody give me any ideas
thanks


jammin
Administrator
posted April 25, 2000 02:04 AM
Well, I see your running a really stiff shock, I would go softer. I can also see that your probably having some problems getting the percentages right on your car by your spring combos.


kruff75
Member
posted April 25, 2000 03:18 AM
whatdo you think i should try first ?
what springs?
what shocks?
the last help i got from ya work great so know that you can help ?
Thanks Kev


jammin
Administrator
posted April 25, 2000 09:15 AM
What percentages are you running? Have you scaled your car out? What type of track are you running?


MelFer
Member
posted April 25, 2000 09:56 AM
Kruff why are you so light on the front? are you running a real dry track or fairly heavy? when we ran a 2700# car we always ran an 1100 RF 800LF to hook the car on exit. This may add the bite that you need


kruff75
Member
posted April 25, 2000 02:33 PM
The track is a 1/3 mile semi banked d-shaped
oval. Turn 1 and 2 are tight and 3 and 4 or more wide open.
the %are
ls=53%
crossw=49%
rear w=56%

Just wondering about the springs. Cant get the car to come of the turns without *** end breaking loose. Entry into turn is ok .
thanks for your help


jammin
Administrator
posted April 25, 2000 03:21 PM
Your crossweight is off I think. I would increase it a couple percent and see if it helps. It will definitely give you more forward bite.


MelFer
Member
posted April 26, 2000 01:37 AM

Kruff I aggree with Jammin The 53% left will require around the same amount of cross weight


MelFer
Member
posted April 26, 2000 01:43 AM
Kruff are you pitching the car on entry or are you slowing down early because of the loose condition. does the car hook after exit after it settles or are you loose all the way out. normally a loose car all the way out will need more cross but if the car is a rocket once it settles out of the turn that is how you tell you have too much cross and are rolling too much weight off the LR
Just trying to Help


kruff75
Member
posted April 26, 2000 05:16 AM
Going into the turn i have to let off a little bit but not bad its when im coming out of the turn that the rear end wants to skate out. like its got to much weight on the rr and not enough on the left.
I was wondering about the 150lb right rear spring if thats not enough of spring for it that it should be around 175. and what about a differnt shock on the left rear i have a 95 what about a 935 or a 93????
Just wondering.
thanks


jammin
Administrator
posted April 26, 2000 11:33 AM
The split valve will hold it down, but I wouldnt put it on until the feature. 49% cross is simply not enough cross on a semi banked track, it will be squirrely out of the turns. The skating you mentioned could be for this same reason also, but if it doesn't cure it, just work on your rr trailing arm geometry and get the rr to lead more coming out of the turns and it will cure it.

[This message has been edited by jammin (edited 04-26-2000).]

MelFer
Member
posted April 28, 2000 10:23 AM
Kruff you must remember that you have 2800# car the rt rear seems to me you would have a lot of roll try the 175RR and DO what JAMMIN says raise the cross!!!!!!!!!! tighten the car on exit. If this does not work and the car is looser on exit we know you have gone the wrong way..


MelFer
Member
posted April 28, 2000 10:25 AM
Sometimes you must do a larger change to feel the results TRY even a 200 RR spring and you will feel the correction quicker and make a logical deduction as wher you would prefer to be


jammin
Administrator
posted April 28, 2000 10:30 AM
Generally, any time you raise crossweight, you actually loosen the car on entry and tighten on exit. This is the general rule. But that can also be manipulated by some other spring and shock combos. So, basically, the tighter you want to be coming out will basically loosen you up going in. So what do we do to counter the loose condition going in? We induce roll into the car to plant the RR. This will set the car and allow you to still come off the LR coming out.
Hope this helps.

[This message has been edited by jammin (edited 04-28-2000).]

kruff75
Member
posted May 01, 2000 12:23 AM
Jammin and Melfer
Thanks the car has never handled so good in a long time tryed what you guys told me and the car took 4th in the feature. And finally got some heat in the rear tires.
So far you guys are batting 1000 thanks for the help!!!!!!!!!!


jammin
Administrator
posted May 01, 2000 01:56 AM
Great, keep in touch and let us know how you are doing. We will help you any way we can.


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