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Author Topic:   5th coil..
iaracer
Member
posted April 23, 2001 06:10 PM
Here is what happened, first time out for hot laps this year, The car was felling fine 2 good solid laps and then a crash in front of me. I am off the gas and the car turns hard to the outside wall. I could not stop or control it. The carm was the same as last year with the exception of a slight increase in rear weight % (1.5%). Cross was 51.3% left 51.0% Rear 57%. What can cause this reaction? I am running the shortie bar. Any ideas would be greatly appreciated.


wfoondirt
Member
posted April 23, 2001 09:14 PM
with the exception of mechanical failures it pretty much comes down to uneven tire loads, and is actually pretty common among some of the chassis setups that are currently popular. Its funny you mention the short panhard bar (i assume thats what you ment by shorty bar). I actually experience the same problem when testing shorter panhard bars. The problem with the short panhard bar is it causes excessive lateral movement of the rear end as the car rolls. Not being familiar with your setup its hard to pinpoint any one thing but, excessive roll steer can also have a similar effect. There are actually quite a few causes but i'd take a close look at you suspension geometry, not only the rear but also the front, because eratic reactions such as you experienced are not good.

were you on the brakes? did the steering pull you? did you go in head or tail first?



iaracer
Member
posted April 24, 2001 07:21 AM
yes tried the brakes as last chance, head first it turned hard right but did not help cranking wheel to the left...not enough time or room.


PEDDLER
Member
posted April 28, 2001 10:16 AM
With a 5th coil over,,,how much preload is necessary and what spring rate would be recommended. The car is a Z link rear.
Thanks


jammin
Administrator
posted April 28, 2001 10:34 AM
One nice thing about a 5th coil is that you can dictate how much spring rate you would like. If you will take your spring down and have it checked, you can see how much rate you can get with the preload that you set. The preload on the spring will determine the initial spring rate. This allows you to run a softer spring and just increase preload to the desired rate. As the spring is compressed, rate always increases.

Just a thought,

jammin


PEDDLER
Member
posted April 30, 2001 05:58 PM
Thanks Jammin.


start79
Member
posted April 30, 2001 06:19 PM
Iaracer...I was talking with another fellow today who runs a "shorty" bar. He mentioned that as soon as you get off the gas the car will try to turn into the wall. He seemed to beleive it was the short bar causing it.