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Author Topic: Oversteer and understeer  (Read 319 times)
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swich
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« on: November 25, 2010, 09:34:50 AM »

After see andre. loose to a 335i at jap fest on the gymkhna and killit it on the 1/8th mile. we see that the scoobie is the more power full car.

so why did he loose? understeer! his nose was running wide(yes even with AWD). so i did some research and found this. yes it is a copy and paste but i think it will help a few ppl to setup a well balanced car for track as well as drag.

"OVERSTEER-(or "loose")

Oversteer is when the car's rear tires lose grip in a turn while the front tires are still gripping. If the rear end starts to slide out from under you in a turn, that is oversteer. oversteer can be mellowed out by useing a rear sway bar, i like the selections from "the progress group" and "comptech" because the have the rear sub-frame reinforcement built in, which helps sturdy the sway bar mounting points and also prevents tearing of the subframe.

here are some ways to prevent/decrease oversteer-(increase understeer)
*increase front tire pressure
*decrease rear tire pressure
*smaller front tire section
*larger rear tire section
*more positive front wheel camber
*more negative rear wheel camber
*more front wheel toe in
*more rear wheel toe out
*more negative front wheel caster
*stiffer front springs
*softer rear springs
*stiffer (heavier) front sway bar
*softer (lighter) rear sway bar
*more forward weight distribution

UNDERSTEER-(or "tight")

Occurs when the wheels are turned, and the car does not turn at the same rate. Causes the front of the car to take a wider apex than the driver's steering lock requires. Also called push, or tight in the US. Can be corrected by adding more front downforce, sofening springs and rollbar, or reducing front tyre pressure. Extreme conditions cause a car to go straight on instead of turning for a corner.
A car is “understeering” when the rear tires have more traction than the front tires – the front end slides toward the outside of the turn instead of turning into the corner.

to decrease understeer, do the opposite of everything on the above list
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Swich: the sound i make as i pass your slow ass
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jdmmonkey
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« Reply #1 on: November 25, 2010, 10:42:52 AM »

We've discussed this plenty of times in the Prelude section but this is an excellent summary for other readers. Will set as a sticky and add to resources index.
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Located in Johannesburg, South Africa, Toyama Racing Spirit specialises in performance tuning serving the public as the authorized dealer for AEM Electronics in SA.

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swich
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« Reply #2 on: November 25, 2010, 10:47:16 AM »

oh sorry. must have missed it. oh well.

cool thanks.
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Swich: the sound i make as i pass your slow ass
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Zookie_JDM
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« Reply #3 on: November 25, 2010, 11:31:10 AM »

Very interesting piece  Wink
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scholtde
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« Reply #4 on: November 26, 2010, 02:11:29 AM »

Thanks swich!! good reference for future needs.
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Aavi
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« Reply #5 on: December 06, 2010, 03:08:10 PM »

Nice read . . .

In other words oversteer is hitting the wall with the back of your car and understeer is hitting the wall with the front . . . Cheesy
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superrob
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« Reply #6 on: April 26, 2011, 04:08:51 PM »

What's understeer he he he. I thought the STi's had that power switch inside so they can tranfer more power towards the rear wheels, wouldn't this and a change of driving technique help with understeer if he's experiencing that.
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jdmmonkey
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« Reply #7 on: April 26, 2011, 04:28:10 PM »

Are you referring to VDC unit? Sure if it allowed enough control you could play with that to minimize the affects of the under steering problem mentioned above. You'd of course need to adjust driving technique as you mentioned Smiley
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Located in Johannesburg, South Africa, Toyama Racing Spirit specialises in performance tuning serving the public as the authorized dealer for AEM Electronics in SA.

Online Shop - http://www.toyamaracingspirit.com/shop/
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superrob
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« Reply #8 on: April 26, 2011, 04:47:37 PM »

Yes that turn knob dial that comes standard with most modern STi Scoobys. I like your style you think as much about driving as you do about the inner workings of your cars. This site rocks then
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