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Old 08-19-2009, 10:12 PM   #1
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Default Cornering & lifting the inside rear tire

I'm running a TC4 tub in VTA on carpet. I've been having a problem with lifting the inside rear tire while mid corner to exit on throttle. Yes, the simple fix is to go slower but my left index finger doesn't understand that too well (working on it). My question is about anti roll bars and which one to make stiffer to correct this issue front or rear? I'm guessing the front. I currently run frt and rear bars both the lightest in the kit. My springs are 14 lbs rear and 17.5 frt.
If I don't let off the throttle completely in time this can cause me to traction roll if I'm carrying enough speed. It's frustrating. Any other suggestions are welcome.
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Old 08-19-2009, 10:14 PM   #2
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make sure your droop and ride height is correct....

if thats correct add a little weight to that corner, with stick on lead weights...

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Old 08-19-2009, 10:19 PM   #3
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+1 to making sure your ride height and droop is set right.

I never got roll bars to work right on my tc4 and I'd hate to add weight. The next thing I might try is stiffer springs in front.

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Old 08-19-2009, 10:19 PM   #4
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It's both tires depending on the right or left turn. Ride height is 5.0 all around and there's about 1 to 1.5 of droop even all around.

The lead weight makes sense to me if the car was only doing it to one tire but sadly it's not just the one.
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Old 08-19-2009, 10:24 PM   #5
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Is that measurement of droop over right height? Before I got a droop gauge, I'd set my tc4 to at least 2 over right height. If you have a gauge, I'd set it to 5 to 6.

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Old 08-19-2009, 10:24 PM   #6
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ok set your ride height at 5.5 and put 2mm of droop in rear and 1.5 in front... see how that works....

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Old 08-20-2009, 08:13 AM   #7
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I'll give that a try. I never knowingly tried uneven droop settings frt to rear.
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Old 08-20-2009, 08:54 AM   #8
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Put it this way. To make use of that wheel, you have to bring it on the ground. Either you let it droop more (i.e. enough that it stays on the ground) or you decrease roll. In your case, given that you have traction roll problems I would try to reduce roll. You can do that in a number of ways not just stiffening the front suspension or using sway bars. The question is how much do you need to reduce roll. That'll decide what method will work and what won't (or work better).
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Old 08-20-2009, 09:21 AM   #9
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Quote:
Originally Posted by pakk View Post
Is that measurement of droop over right height? Before I got a droop gauge, I'd set my tc4 to at least 2 over right height. If you have a gauge, I'd set it to 5 to 6.

--pakk
You are confusing droop, with downstop setting.
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Old 08-20-2009, 09:25 AM   #10
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Really? Please explain the difference. I always thought it was just two different ways to measure it.

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Old 08-20-2009, 09:36 AM   #11
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It must look quite impressive

Providing the shocks are not leaking, I would stiffen up the front shocks with a harder spring, and check your rear droop setting. Sounds like it needs a bit more on the rear.

Or the front shocks are sat up too much that the car isnt rotating enough and simply digging in, allowing the back end to do its own thing
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Old 08-20-2009, 09:44 AM   #12
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I've seen alot of VTA cars do this...I figured it was the lack of downforce from the body..good question
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Old 08-20-2009, 10:29 AM   #13
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There's also the question of whether the car is shifting too much weight on the outside front tire, so perhaps the overall balance of the car needs to be checked too (especially the front vs rear bias).
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Old 08-20-2009, 11:20 AM   #14
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When checking or adjusting your weight bias for front to rear, remember more weight in the rear will transfer more weight the to front mostly likely making the problem worse. It's best to make sure you have 50/50 or close to it front to rear.

More weight in rear causes the car to over-steer.
More weight in front causes the car to under-steer.
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Old 08-20-2009, 03:20 PM   #15
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My weight balance is even right to left and just slightly frt heavy - maybe 1/4 to 3/8 inch forward of center.

My shocks seem free and fluid with no noted leaks. I'm planning on taking them apart soon to make certain though.
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