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Author Topic:   Car Pushing mid corner out., need suggestions
mod27
Dirt Freak

Total posts: 325
posted May 09, 2004 09:51 AM  
I have a swing arm Z-link chassis with spring on swing arm on left and on top of housing on right
we have tried everthing i can think of, but when track gets dry slick, the car will start pushing about mid corner thru exit, sometimes so bad i just about have to stop to make it turn. also lacking some forward bite on exit, starts pulling hard abotu 1/4 way down straight out of corner.
No matter what track we run, or what set up i try, it does same thing when track gets dry slick.
Seems it does it worse when i run in the black,
Need some ideas or something, have a fast car, just need it fast thru corners.
LF 750 RF 850
LR 275 RR 175
I have tried different springs, shocks, wedge, added lead to car (left side, right side, rear, all over back, etc, tried stagger, wheel offsets, etc).
Seems no matter what set up it has it does same thing,
ANY IDEAS ?????????

Forgot to add, we have tried j-bar, and short bar, tried different rakes with both also.

[This message has been edited by mod27 (edited May 09, 2004).]

MOD75D
Dirt Freak

Total posts: 236
posted May 09, 2004 10:33 AM  
What are your %'s as of now?

mod27
Dirt Freak

Total posts: 325
posted May 09, 2004 03:47 PM  
as of right now, car has:
53.6% left side
52.8% cross
60.4% rear

I have tried:
53.6 left, 53.1 cross, 59.5 rear
53.2 left, 54.2 cross, 56.5 rear

all have the same outcome.
Nothing binding on car, checked that all out also.

MOD75D
Dirt Freak

Total posts: 236
posted May 09, 2004 06:18 PM  
Check your numbers and see how much bite you have in the car. I think you may have too much cross in it. Might try 49%-50% cross. What angle are your bars at on the rear? What are your ride hights?

mod27
Dirt Freak

Total posts: 325
posted May 09, 2004 06:31 PM  
174 lbs left rear bite
left rear bar is in top hole on birdcage, and runs down hill towards back. Only one hole to bolt into on rear.
Right rear bar is level in top hole on rear.
(car has 3 holes on rear)

Ride heights: metric front clip
this is where chassis builder sheet says to set ride heights.
and that is how i have it:
6 1/4 LF 6 1/2 RF
3 1/4 LR 3 1/4 RR


MOD75D
Dirt Freak

Total posts: 236
posted May 09, 2004 08:43 PM  
I know you are probably getting tired of all these questions. I am sorry but just trying to get all the info. I was just wondering if you checked to see if the rear was square in the car or if you have any lead? The bars sound ok to me. How much angle do you have in the pull bar? What kind of spring? Also are you running a 90/10 shock on the rear?

mod27
Dirt Freak

Total posts: 325
posted May 09, 2004 08:52 PM  
i have tried it with rearend square in car and also with lead on right rear.
Not sure what the angle is on pullbar. It was in middle hole, i moved it to the left, didnt help, i moved it down to bottom hole, didnt help.
Pullbar has 800 spring on it
it has a dampner shock on it, it runs towards back of car.

badfastjr
Dirt Maniac

Total posts: 193
posted May 09, 2004 09:53 PM  
lr spring seems kinda stiff and the rear percent seems kinda high. If you change both of these and it still does it, maybe softening the rf spring would help a little.

boas51
Dirt Maniac

Total posts: 190
posted May 11, 2004 07:35 AM  
have you tried more angle in the front bars? a little rear steer might help.

dirtracr
Dirt Maniac

Total posts: 199
posted May 12, 2004 11:32 AM  
soften front springs 50# each..

boas51
Dirt Maniac

Total posts: 190
posted May 13, 2004 07:29 AM  
you might also want to consider camber/camber change. do you take tire temps? i have found my cars like a lot more camber then what most recomend. especially on slick.

dirtywrench13
Dirt Freak

Total posts: 324
posted May 15, 2004 06:46 AM  
just try dropping your l.r.spring rate to a 200 or a 225 and maybe the r.f. to a 750 or an 800. if you have a pull bar you may be able to move the rear to the left to help the throttle push.

Dman
Dirt Freak

Total posts: 270
posted May 15, 2004 11:05 AM  
You have too much LR bite.Drop it to around 80 to 100 lbs. Add more stagger if you can.

mod27
Dirt Freak

Total posts: 325
posted May 15, 2004 02:21 PM  
left rear tire was not even hot when i came in, they right rear was very hot.
Just thought i would add that also.

Going to try some of the advise tonight and see what it does.

Thanks

midmod34
Dirt Maniac

Total posts: 119
posted May 15, 2004 05:32 PM  
I run 900 lf 800 rf 350 lr 250 rr yes those are right. 280-340 lbs bite z link both sides 57 rear 75 shocks in front 94 in rear solid pull bar front links 17 degree up rear links are angled down as far as i can in my car car is a little snug for heats, but will drive anywhere in the feature

dirtywrench13
Dirt Freak

Total posts: 324
posted May 16, 2004 06:54 AM  
how much angle do you have in your bars,and can you put more in them? specificaly the right side.my d-w 8 has enough bite in it that it will pull the right side back up and onto the 4-link,ever so gently. it was a freekin rocket last night but didnt have enough weight in it.started loosing ground with 8 laps to go,and was still in the top ten!

mod27
Dirt Freak

Total posts: 325
posted May 16, 2004 09:31 AM  
Thanks to all who replied.
I made a few changes on the car and last night it was fast. I had it alittle tight on entry for heat race, but feature time the car was on the money.
I was running good, some guys did some brake checking on a restart and i got taken out, had to go to tail, but was coming up thru field fast Untill some crazy driver took me out. He ran me into backstretch wall and he never lifted.
He destroyed my ride.
Now i will have to order a new car.
Atleast the advise i got from here worked for awhile anyway...

MOD75D
Dirt Freak

Total posts: 236
posted May 17, 2004 05:44 AM  
Real sorry to hear that. I am glad it was fast. How bad is the car?

ss#4
Dirt Maniac

Total posts: 110
posted May 17, 2004 10:21 AM  
Mod27 So what did you end up changing to make the improvement?

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