Ladder bar Vega going hard left during wheelie

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VegaJohn
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Ladder bar Vega going hard left during wheelie

Post by VegaJohn » Tue Sep 11, 2018 1:18 pm

I’m having issues with my Vega going left during initial launch. I have been bandaiding the issue with wheelie bar stagger and wheelie bar spring preload but this weekend it got worse and I had to pedal it when it was up pretty good and I smacked both oil pans on the track. I scaled the car and this is the car with me in it.
Lf733 rf666 lr656 rr565.
Pic is car without me
Looking at the numbers it should be going right not left I would think. Is it possible I’m hitting the left tire so hard that it squishes so far that it’s diameter causes the quick left condition? I’m going to pull the ladder bars and look for bent front heims and reinstall them with zero preload and start from scratch. Best 60ft has been 1.31 car runs 6.12@111
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VegaJohn
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Re: Ladder bar Vega going hard left during wheelie

Post by VegaJohn » Tue Sep 11, 2018 1:30 pm

I also measured my slicks. Left one is bigger by 7/16” car never did this with less HP. Tire psi I was running was 8.5psi wish I would have tried 9.5-10

6.50camaro
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Re: Ladder bar Vega going hard left during wheelie

Post by 6.50camaro » Tue Sep 11, 2018 4:45 pm

The car will drift to the side with less traction ,that tires is not pushing forward as hard. Add preload to the left side or take preload away from the right. Dan

SupStk
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Re: Ladder bar Vega going hard left during wheelie

Post by SupStk » Tue Sep 11, 2018 6:36 pm

Is the dimension difference on your slicks in circumference?

There is lots of things which could be causing the issue.
First since its gotten worse and ruling out slicks that are going away and track conditions, I wonder if the frame hasn't diamonded? Before measuring for that I'd check all suspension pivot points for bent, binding parts and the rear axle is straight under the car.
Concerning preload, try using a piece of angle iron with the V pointed up on a floor jack under the middle of a front cross member. With the drivers weight in the seat, the front wheels should be close to the same distance off the floor. If it isn't close its a good place to start and you can adjust from there.
Keep us posted on your results, might be able to help you figure it out.
Monty Frerichs
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VegaJohn
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Re: Ladder bar Vega going hard left during wheelie

Post by VegaJohn » Tue Sep 11, 2018 9:47 pm

The left slick circumference was 7/16 bigger than the right side. So far I found that both front ladder bar heims were quite loose. The left rear lower coil over mount is bent and Is lower than the passenger side is. Also I had my coil overs preload almost all off. I’m wondering if I was bottoming out the passenger coil over with the twist of engine torque on launch and it was driving the passenger tire down hard.

Monza Harry
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Re: Ladder bar Vega going hard left during wheelie

Post by Monza Harry » Fri Sep 14, 2018 10:01 pm

Vega John, don't rule out anything! Check everything from the welds holding the tubes in the "Pumpkin" to the suggestions above. "You added power and now it steers" if I understand your remarks, that means something is no longer up to the task at hand and you need something more robust. I would look HARD at the chassis, something is moving/flexing that didn't before, just some of my collected/learned experience. Please share your chassis specifics, maybe some more to learn/share for us and you. Harry

Ladderbar
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Re: Ladder bar Vega going hard left during wheelie

Post by Ladderbar » Sun Sep 16, 2018 9:09 am

did you swap the rear tires? after you check everything and if it still dose it swap the rear shocks. but make sure every thing is good first.

VegaJohn
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Re: Ladder bar Vega going hard left during wheelie

Post by VegaJohn » Sun Sep 16, 2018 9:43 pm

Ladderbar wrote:
Sun Sep 16, 2018 9:09 am
did you swap the rear tires? after you check everything and if it still dose it swap the rear shocks. but make sure every thing is good first.
I didn’t swap the tires yet, so if adjusting everything else doesn’t fix the problem I will try that. I suppose the odd time a slick might just not hook up like it’s mate? They are 1 season old. My last pair were date coded 2004 and came with the car and still hooked up good but it was only running 6.4s then. 6.1s now.

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