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Author Topic:   GRT Dry Setup
smastermotorsports
Dirt Newbie

Total posts: 4
posted April 26, 2000 11:15 PM  
My car is loose coming out of the corner until the car is straight. Then it hooks up well. What can I do to tighten it up?
Running LR shock behind axle w/ 250# spring and 225# spring on RR with 120# LR heavy. RF spring/shock is 400# with 75/3 and panhard bar on 2 notch from bottom.

jammin
Dirt Administrator

Total posts: 6243
posted April 27, 2000 08:37 AM  
quote:
Originally posted by jammin:
what kind of track are you running on?
1/2 mile slight bank and track dries out quickly during a feature race


jammin
Dirt Administrator

Total posts: 6243
posted April 27, 2000 12:42 PM  
smastermotorsports:

In my eyes you may have a couple things going on here. First you should consider increasing your rear spring split, up your LR to a 275, our GRT responds much better with a 275 LR behind axle. 120 lbs. bite on the half mile is in the ball park, if the track has sweeping turns. If your running the short straight pan hard to left of pinion, I think you have too much rake in the pan hard in the 2nd notch from bottom. What happens is you induce too much body roll, even on corner exit. Your pit crew probably notices the left rear walking forward under acceleration. Under these conditions you are possibly inducing too much loose roll steer. Some teams prefer to combat the loose condition with bite but we prefer to get a good balance and proper weight transfer to correct problems. We have found that our GRT responds much better on the half mile tracks using the long J-bar (24.5") from the outside of frame to the right side of pinion. A good starting point would be at 7" up from bottom of frame and the 4th notch up on pinion.

smastermotorsports
Dirt Newbie

Total posts: 4
posted April 28, 2000 05:34 PM  
[QUOTE]Originally posted by smastermotorsports:
[b]My car is loose coming out of the corner until the car is straight. Then it hooks up well. What can I do to tighten it up?
Running LR shock behind axle w/ 250# spring and 225# spring on RR with 120# LR heavy. RF spring/shock is 400# with 75/3 and 18-1/2" panhard bar on 2 notch from bottom. How about shortening the right upper and lower trailing arms 1/4 to 1/2" to square up the rear end to have both upper and lower and trailing arms to be the same when the track goes away? Wouldn't closing these up help?

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

BrianGRT777
Dirt Roller

Total posts: 19
posted May 22, 2000 12:11 AM  
Wouldn't shorten those four bars unless your track gets really, super slick. Friend at a shock company has us running 6 on comp. and 4 on rebound. It seem to keep the car timed right. Maybe try to lower left lower bar to kill some rear steer. we tried Squaring the wheel base, the car was to tight everywhere but when it was on the trailer.

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