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Author Topic:   Push on straights
Elwood
Dirt Full Roller

Total posts: 31
posted May 01, 2001 09:00 AM
Need a little advice from the dirt guru's.

Just took my car out for the first time this year after making some changes to weight and position of the weight.

Stagger
front 1 1/2
back 1/2

lr bite 55lbs

Rubber bushing pull bar set with pinion angle at 7 deg.

My problem is that driving on this 3/8 mile 23 deg. banked track. is that when I give it the gas going down the stretch the rear end feels like it jumps to the the left and the car drifts up the track to the wall. The drift alone is probably around 10 ft from start of stretch to the point I let out of gas to set up for turn.

Is there anyone that can give advice thats not to overly technical. I do this for fun and I want to be safe first of all and the speed will come later.

Thanks

wfoondirt
Dirt Maniac

Total posts: 142
posted May 01, 2001 09:54 AM
First of all, what are the percentages, cross and left side? with 55lbs bite in the car i can't imagine having too much cross but its hard to say. what kind of rear suspension? How much rr lead/trail do you have, (basically which way are the rear wheels aimed). i'd look at that first if this is a car that is basically the same as you ran last year with no major changes. if its a new car you have never run it could be any one of a number of things in rear suspension design. The most common causes of a throttle drift is from excessive rear steer (lr moves forward under accel) it can easily be fixed but without more info its hard to no which direction to go.
Just to clarify though, you are steering to the left and the car is drifting right, correct?

Elwood
Dirt Full Roller

Total posts: 31
posted May 01, 2001 10:31 AM
Yes I am steering to the left and drifting right. ( that one gave me a chuckle for some reason ) Without my setup sheets here I will stab a guess at the %'s

left 52.3%

cross 48.8

rear 53.6%

2 link with pullbar
and the rear end is square.
Same car as last year no major changes except more ponys and 100 pounds lighter.
Thanks

[This message has been edited by Elwood (edited May 01, 2001).]

brownstone
Dirt Full Roller

Total posts: 45
posted May 01, 2001 10:41 AM
Check the wheel base the right side may be longer than the left even a 1/4 inch will make a difference.

If wheel base is the same on both sides then I would shorten the right side by 1/4 inch thi should fix the push.
Good luck

Wauge28
Dirt Full Roller

Total posts: 32
posted May 01, 2001 12:59 PM
How about spring rates in the rear? Is it possible you have a weak spring that is causing the rear to drop when you get on the gas? Too much lift or drop could cause loose steer even on the straights????

Gene
Dirt Full Roller

Total posts: 48
posted May 01, 2001 03:14 PM
This is what our car was doing. Read the post on panhard bars. Ours was binding aginst the rear end snout. Darting up aginst the wall.

wfoondirt
Dirt Maniac

Total posts: 142
posted May 01, 2001 10:37 PM
if the rearend it truely square in the car i would definately recommend leading the rr, exactly how much depends on how the car feels but i would start at around 3/8". on most 3-links the lr moves forward under accel and is more than likely causing the drift. if leading the rr doesnt work, the problem is more complicated.

Elwood
Dirt Full Roller

Total posts: 31
posted May 02, 2001 08:15 AM
I found that one of my tie rod assy. bolts that mounts to the spindle was loose (let someone help me set front end, didnt check after their work).

I also found the rf shock had bottomed out would that cause the drift? If so I will change that first and then race it and see.

Thanks for the page Gene I looked around the car and cannot see any wear that might be taking place.

I run again on 5/12 I will let you know how this progresses.

Thanks

Reign
Dirt Full Roller

Total posts: 54
posted May 02, 2001 02:56 PM UIN: 28044483
if u have a 2 link similar to harris rear setup u may wanna try lifting the rr lower arm or lowering the left lower arm

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