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Plowing Understeer

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Old Aug 9, 2006 | 09:51 AM
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Default Plowing Understeer

This weekend I ran my car at the Redline time attack event

The track is kind of an anomaly as it's off camber in many turns even has a Karosell type turn and a crown in some of the corners.

I was getting horrible understeer in some of the corners, so bad the car felt like a FWD car in places. These were all tight 2nd gear decreasing radius turns.

Turn in is ok, just mid turn the car would start to plow, I either had to lift to get the car to rotate (which was not very smooth) or just nail the throttle to wheelspin and drift the car around (much more fun)

I tried tire changing tire pressures and shock settings, even removed the wing for the last attack run.

I only have about 2.5 degrees of front camber (max) will much more camber cure this? I will need some sort of camber kit

Should I run a hair of front toe out?

Could a worn bushing be the cause of something like this?

Here is the track layout


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Old Aug 9, 2006 | 09:58 AM
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Do you have a front bar?
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Old Aug 9, 2006 | 10:01 AM
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Need to know more about setup, esp. tire sizes.
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Old Aug 9, 2006 | 10:14 AM
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Comptech Front ADJ bar (On softest setting)

Stock 02 rear bar

225 Ra1 front (16") 245 Ra1 rear

-2.5 camber front, -3.5 camber rear

0.02 front toe in total

0.35 toe in rear total



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Old Aug 9, 2006 | 10:19 AM
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A few notes,

My RA'1s had about 6 events on them before this, I had them flipped and rebalanced prior to Sunday.

They had significant wear already on the outside edges (fronts)

no cording though.

I may have cooked them their first outiing in May, came back in the mid 40's hot.


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Old Aug 9, 2006 | 10:53 AM
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I have had this understeer problem on other tracks and fresher tires, on this track it was more prevelant.

I would just know how I can tune it out.
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Old Aug 9, 2006 | 11:31 AM
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I have the same problem at really tight 2nd gear corners. I think the easiest way to cure that will be running non-staggered tires.
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Old Aug 9, 2006 | 01:12 PM
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I'll make the suggestion that you may be over-driving the car into the turn. My Spec Miata will understeer into a turn (especially a tight one) if you carry too much speed. Once I learned to slow down my corner entry and rotate the car early before getting on the throttle, the understeer greatly diminished. Not only that, because I could get on the throttle sooner, my lap times improved.
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Old Aug 9, 2006 | 01:12 PM
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That's a expensive easy fix.

Does anyone have any alignment suggestions to try?

What about 50 lb/in less front spring?
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Old Aug 9, 2006 | 01:20 PM
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Originally Posted by CoralDoc,Aug 9 2006, 02:12 PM
I'll make the suggestion that you may be over-driving the car into the turn. My Spec Miata will understeer into a turn (especially a tight one) if you carry too much speed. Once I learned to slow down my corner entry and rotate the car early before getting on the throttle, the understeer greatly diminished. Not only that, because I could get on the throttle sooner, my lap times improved.
It could be that, or it could be that he just is at limits of his car's grip and now he needs a way to add more grip to the front of the car. 225 front tires are puny, I realize you're on 16" stock wheels, but try upsizing to 235 or 245 if available. More camber also helps.
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