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Oversteer on high-grip surfaces

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Old 04-08-2009 | 06:16 AM
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Default Oversteer on high-grip surfaces

My buggy can drift corners nicely on very loose surfaces, but on asphalt it likes to do a 180 "VERY" easily. I suspect a toe-in adjustment might help. I was thinking of reducing the front toe-out, or increasing the rear toe-in.

It has no center differential, and the front and rear arn't designed to hold oil, so nothing I can do there.

There are lots of other adjustments such as shocks, swaybars, etc, but it doesn't appear to be suffering from a roll issue.

Any thoughts on the problem?

Old 04-08-2009 | 08:16 AM
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Default RE: Oversteer on high-grip surfaces

Don't know about the toe-in's and toe-out's but thinking about the different surfaces your driving on would first make me think about a different set of tires?
Old 04-08-2009 | 08:25 AM
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Default RE: Oversteer on high-grip surfaces

Soften the rear suspension and remove any rear sway bar you have. Alternatively, stiffen the front end.

The rule of thumb for handling... To induce over or understeer, or correct either, you simply soften the suspension at the end you want to grip, or harden the suspension at the end you want less grip. This goes for almost all suspension adjustments, spring rate, shock oil, sway bar thickness, camber.

You should definitely reduce front toe-out if you have a lot, but increasing rear toe-in won't help much. Consider lowering the car when running on asphalt, and increase rear droop.
Old 04-08-2009 | 08:37 AM
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Default RE: Oversteer on high-grip surfaces

Thanks Foxy, that's good info.
Old 04-08-2009 | 10:21 AM
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Default RE: Oversteer on high-grip surfaces

Yes, thank-you. Makes sense, and I'll try those things.
Old 04-09-2009 | 06:55 PM
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Default RE: Oversteer on high-grip surfaces

There are so many things to do.

A softer rear sway bar is an easy change. If you don't have one just tighten up the front one a few mm.
Softer rear end suspension is another thing to test.
Lower the rear ride height slightly.
Rear camber link in a lower position.
Lighter diff oil in the rear.

Changing the rear toe to 2 deg from 3deg makes the car more predictive in handling. It doesn't loose grip suddenly but more gradual. It can make it feel easier to drive on the edge.
Old 04-10-2009 | 06:30 AM
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Default RE: Oversteer on high-grip surfaces

Thank-you...lots of stuff to try. Im sure I will get improvement sooner or later....LOL.

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