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Author Topic:   Too much lift
A&M Motorsports
Dirt Maniac

Total posts: 117
posted April 18, 2005 11:10 AM  
I have a hard headed friend with a few year old Kraft car running on swingarms. His car is lifting in the rear so high the panhard bar is pulling the rear housing a lot to the left and when he gets off the gas it slams down and there ain't no telling which dirction it's gonna go. He has a lot of angle in the swingarms and a lot of pull bar angle and has since put it on a j-bar and I believe it's worst. I told him to take alot of angle out of the bars and it'll settle down but his reponse was I gonna loose all my forward bite. Is there any hope for him?

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Artie Perilloux
A & M Motorsports

Xtreme12x
Dirt Forum Champ
Total posts: 874
posted April 18, 2005 01:58 PM  
hey, email me at xtreme12x@mchsi.com
want to ask ya a few things.

Anyways, try a stiffer shock on the left rear... If it comes down violently, then you also might try 2 90-10's

dirtbuster
Dirt Forum Champ
Total posts: 2007
posted April 18, 2005 02:33 PM  
What angle does he have in his swingarms, and is it a swingarm 2 link or zlink?
He's right he prob will lose forward bite if you take angle out. The correct shocks will help settle the car better especially on the LR.


So are the guys on 4 bar cars that lift on the rearend doing something wrong too? should they take angle out of their bars and 'settle' the car down?


A&M Motorsports
Dirt Maniac

Total posts: 117
posted April 19, 2005 05:00 AM  
Dirtbuster, you have a valid point but maybe I was unclear in my post. There is no bar car that I have seen that lifts in the rear like his swingarm (both the left and right rear). I can't tell you exactly how high but everyone that watches sees the same thing, it looks about a foot and a half.
His car is set up with swingarms on clamp brackets, no swingarm z-link.
Oh I almost forgot this one. He put two shocks on the left rear to try to stop it from slamming down off of the throttle. What actually happened is that it pinned the left down and only the right lifted. When he got off the throttle the car spun around backwards and exited the track that way at W.O.T.

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Artie Perilloux
A & M Motorsports

[This message has been edited by A&M Motorsports (edited April 19, 2005).]

dirtbuster
Dirt Forum Champ
Total posts: 2007
posted April 19, 2005 07:53 AM  
does he have an underslung bar or a limiter chain to stop the rearend travel.

He might be better off with a split valve shock on the LR like a 7-3 valve, that way it slows the compression or slamming down, but doesnt affect rebound and lets the car rise freely.

A&M Motorsports
Dirt Maniac

Total posts: 117
posted April 19, 2005 08:45 AM  
On his Kraft car there is no underslung in the area below the axles, just the way it's designed. He has also tried the split valve shock with limited success. The idea was kicked around about a limiting chain but I figured when it got to the end of the chain it would want to pull the rear tires off of the ground. Silly me thinking again. If the limiting chain works, that would probably solve his problem. Gimme some more info on the limiting chain if yall don't mind.

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Artie Perilloux
A & M Motorsports

Xtreme12x
Dirt Forum Champ
Total posts: 874
posted April 19, 2005 11:54 AM  
It's not a Kraft then, it is something different. From the Pic you sent me it might be a Lightning...

dirtbuster
Dirt Forum Champ
Total posts: 2007
posted April 19, 2005 01:13 PM  
If there is no limit to how far the rear can travel then I can see it causing problems. I would put a chain or strap or something on it to limit total travel. From ride height set the chain so that it allows 4" of travel to start with and adjust from there.

2nd2none
Dirt Forum Champ
Total posts: 755
posted April 19, 2005 02:46 PM  
is he fast?

A&M Motorsports
Dirt Maniac

Total posts: 117
posted April 20, 2005 05:37 AM  
quote:
Originally posted by 2nd2none:
is he fast?

No he is not fast. The car moves up and down too much and all of the movement he's getting is tossing the rear axle all over the place making it real difficult to drive.

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Artie Perilloux
A & M Motorsports

Ego Racing
Dirt Forum Champ
Total posts: 724
posted April 20, 2005 08:08 AM  
If both sides are lifting he may have the bars set wrong to begin with. We had a car that got a rear arm bent and it tried to lift the right rear. If his top link has to much angle in it it could lift the rear and it would actually unload the rear so he would be loosing rear bite and not know it. He should also check his right rear shock and see if it is bent and limiting the right side from rolling over. This would cause the right rear bars to be out of angle when he got onto the pedal and they would lift the right side of the car.

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