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Author Topic:   throttle push on 4lr-2rr
washeduptoo
Dirt Maniac

Total posts: 155
posted July 10, 2005 11:38 PM  
When you get on the gas in turn, the car pushes, get off gas, then get back on the gas. This happens almost every turn when tacky. If I didn't want to adjust the angles in the bars or the rear springs,(because we are happy with everything except the push) would increasing the rf spring 50-100 take care of this problem. I've looked thru the archieves and I believe this would help. Am I wrong or do I need give up the notion of not messing with the rear suspension. Thanks again for your help. Metric clip car 850 springs across the front.

CUSTOMPERFORMANCE
Dirt Forum Champ
Total posts: 1172
posted July 11, 2005 12:06 AM  
What are the rear spring rates along with your setup inco?

washeduptoo
Dirt Maniac

Total posts: 155
posted July 11, 2005 04:12 AM  
225 lr spring behind, 200 rr spring on top of housing. lr top bar about 20 uphill,lr lower 5 uphill, rr bar about level, lr top 16 long, bottom 14 long, if more information needed, just let me know. Thanks

donslink1
Dirt Freak

Total posts: 318
posted July 11, 2005 07:44 AM  
No, decrease the rf spring rate and it will free the car under power through the corner.
If the the track slicks up and you need that bite then put a spring rubber in the rf.
The stiffer rf spring holds dynamic bite in the car and tightens it up under power.

irace74
Dirt Forum Racer

Total posts: 80
posted July 11, 2005 08:40 AM  
It also sounds as if you could stand to loose a little left rear bite by loweering the upper bar a few degrees. If you don't like lessening bite on the left rear then adding bite in the right rear will accomplish a similar result. Stiffening the right rear spring will make the car looser on exit.

jws
Dirt Maniac

Total posts: 115
posted July 18, 2005 12:22 PM  
If you are just learning to drive, not messing with the rear suspension might be Ok. If you expect to consistently run up front you had better learn what those adjustments do and where to go with them when the track changes. To correct a throttle push in order of simplicity, more stagger, less bite, lr top bar down(4 bar right?), lr bottom bar up, softer lr spring, softer rf spring, stiffer rr spring, more rear steer at RR, move both ends of pull bar to the right. There are more, those are the basics. Don't be afraid to wrench on that thing. Good Luck.

washeduptoo
Dirt Maniac

Total posts: 155
posted July 18, 2005 12:57 PM  
Thanks for the information, we decided to move top lr bar down but also move the lr bottom bar down and give this a try. Thanks again, hope to get to race this weekend.

smyle
Dirt Roller

Total posts: 13
posted July 18, 2005 01:10 PM  
What about adding rear steer...will that loosen the car up when you get into the gas?

gould
Dirt Forum Champ
Total posts: 730
posted July 18, 2005 05:21 PM  
wouldn't adding rear stagger help?

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www.geocities.com/gouldracing11

jws
Dirt Maniac

Total posts: 115
posted July 20, 2005 07:09 AM  
I'll bet that if you move both the bottom and top bars down you will be just a bit tighter over all. That's what my car does. Why not just move the top bar down one hole?

washeduptoo
Dirt Maniac

Total posts: 155
posted July 20, 2005 09:01 AM  
Our bars right now are at top, 10 uphill and lower, level. You think this is going to take away too much loose roll steer? You might be right after thinking about it. We were running the top,15, and the bottom 5, uphill. Thanks for any input.

jws
Dirt Maniac

Total posts: 115
posted July 20, 2005 09:07 AM  
My experience is that when you drop the bottom bar to level it will really tighten the car up all through the corner. Dropping the top bar will tighten the car in slightly, but will free it up on the gas. For heavy tracks my bars are about 12 degrees top and 5 degrees bottom with no bite in the car and 2" stagger.

washeduptoo
Dirt Maniac

Total posts: 155
posted July 24, 2005 07:12 PM  
Thanks guys, the car worked real well last night, but the track was real dry slick. Won the heat race again(our best showing yet on dry slick), finished 4th in the feature. We still have work to do on dry slick, any suggestions? I was thinking about moving the lr top link back up a notch for dry slick to get some more forward bite, but car worked so well, I might try something different, maybe a spring change on the front.

dirtmod0
Dirt Maniac

Total posts: 143
posted July 24, 2005 07:40 PM  
if car was that good why make a big change like changing spring try messing with some shock valving.

rpm20
Dirt Freak

Total posts: 338
posted July 25, 2005 07:36 AM  
simply changing to a 3" offset on both rears would help a ton.

jws
Dirt Maniac

Total posts: 115
posted July 25, 2005 12:35 PM  
Lots of ways to go here. If you want to tighten up all the way around, move that bottom bar down a hole. If you can afford to be a little looser in and want to be tighter on the throttle raise the top bar one hole. If it's real close to the way you want, you might just want to crank in about 40 pounds more lr bite and tighten up that way. You can move the RR in or the LR out to tighten up a little also. One thing is that while raising the top bar and lowering the bottom will both tighten up the car on the throttle, raising the top will stand the car up on the bars while lowering the bottom keeps it calmer.

andykmod
Dirt Freak

Total posts: 351
posted July 25, 2005 03:26 PM  
You could also try slowing down the birdcage indexing if at all possible.

washeduptoo
Dirt Maniac

Total posts: 155
posted July 26, 2005 09:22 PM  
After talking to the driver tonight, he informed me, the car could be a little more loose in and a little tighter off. Raising the top lr link should do this correct? Also said car could use a little more instant forward bite, would raising the top lr link also help this or do yall have some other suggestion. Thanks for the help.

FlyNLoIMCA17
Dirt Forum Champ
Total posts: 753
posted July 26, 2005 11:38 PM  
Yup pull that top bar back up a hole. But doing that isn't really going to effect the entry much if any. How much LR bite are you running?? Increasing the LR bite will loosen entry and tighten exit. I run between 60-70lbs of LR. My car does pretty good as we have talked before, but really mine could stand to be a little tighter going in so try those things, one at a time.

[This message has been edited by FlyNLoIMCA17 (edited July 26, 2005).]

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