What causes this and what is it called?
Thread Starter
Le Mans Master
Joined: Nov 2000
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From: Durham NC
What causes this and what is it called?
When you really wind it up and hit the gears near the higher RPM ranges, it feels like the car "jumps" a bit to the left or right.
I would have to imagine that it's because you are putting down so much torque all at once.
Is there a term for this?
I would have to imagine that it's because you are putting down so much torque all at once.
Is there a term for this?
Thread Starter
Le Mans Master
Joined: Nov 2000
Posts: 7,020
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From: Durham NC
Re: What causes this and what is it called? (Godspeed)
That's what I thought. Anything that can be done about it or ways of reducing it? It was very quick and didn't feel like I lost control. Just shimmy a little bit.
Gawd this thing makes some power!
Gawd this thing makes some power!
Thread Starter
Le Mans Master
Joined: Nov 2000
Posts: 7,020
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From: Durham NC
Re: What causes this and what is it called? (THENAKEDi)
I guess it's all a matter of learning the car. In the mean time, active handling and TC will be on :D I ain't no racer, that's for sure.
Race Director
Joined: Aug 2000
Posts: 17,992
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Re: What causes this and what is it called? (QWK SLVR)
I guess it's all a matter of learning the car. In the mean time, active handling and TC will be on :D I ain't no racer, that's for sure.
Joel
Le Mans Master
Joined: Aug 2000
Posts: 5,531
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From: Austin Texas
Re: What causes this and what is it called? (QWK SLVR)
Think of it like this: the engine turns in a single direction. As the engine accelerates in one direction the chassis feels a force in the opposite direction (Newton at it again). So one rear wheel whill have more effective weight on it than the other rear wheel (chassis is stiff). As you get close to the limits of available traction, the one with more effective weight retains grip while the other begins to loose grip. With one rear wheel giveing more thrust than the other, the car will tend to self steer in one direction. The old 427 Cobras could be made to do loops from a standstill by this aplication of TQ.
You can feel the steering effect under heavy engine acceleration, and feel the opposite steering result under heavy engine deceleration. Try them both, then learn to smoothly apply throttle, brakes and steering inputs to minimise the errent effects on you chosen line.
You can feel the steering effect under heavy engine acceleration, and feel the opposite steering result under heavy engine deceleration. Try them both, then learn to smoothly apply throttle, brakes and steering inputs to minimise the errent effects on you chosen line.
Melting Slicks
Joined: Jul 2001
Posts: 3,284
Likes: 3
From: Southwest Florida
Re: What causes this and what is it called? (MitchAlsup)
It occurs more often on roads that are not level (left to right) or when you are going around a turn. If you are just talking about a short chirp, you usually don't have anything to worry about if you are driving in a straight line. If you chirp the tires going around a tight corner, you can lose it quickly. Sometimes you can jump side to side a bit on a perfectly straight road if the amount of traction under both rear tires is different. If it happens around a corner and the back end shifts toward the outside of the turn, it's probably just because you lost traction on the rear tires and the rear end started going where it (naturally) wants to go.
Mike
Mike
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Advanced
Joined: May 2001
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From: USA
Re: What causes this and what is it called? (mchaney)
Watch for this too. I began watching myself when this happened and caught myself involuntarily projecting my left elbow toward the door when grabbing a gear under accleration in a turn. Since left hand is the only one on the wheel when shifting, the movement made me tug on the wheel just a little. I think the overall response of my arm weight to the considerable lateral delta V also contributed. I tried running the car at high RPM in lower gear and blipped the throttle to simulate the applied power change while keeping both hands on the wheel. No sideways lurch was noticed. Just some really cool wheel drift when I kept the launch activator fully depressed.
Drifting
Joined: Jun 2001
Posts: 1,511
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From: "Once you have flown, you will walk the earth with your eyes turned skyward; for there you have been
Re: What causes this and what is it called?
I agree with earlier posts that what you are experiencing is more than likely related to driving technique than a mechanical problem with your car.. there is a whole lot of upper body movement going on when you are "rowing through the gears" and any slight movement of your left arm / hand while you are under hard accelleration can transmit unwanted/unexpected steering input. Next time concentrate on smooth shifts and be aware of upper body movement... maybe repositioning your hand on the steering wheel might help too.
Then again I could be full of excrement too!
[Modified by XmentalPilot, 10:32 PM 8/22/2001]
Then again I could be full of excrement too!
[Modified by XmentalPilot, 10:32 PM 8/22/2001]
Drifting
Joined: Sep 2000
Posts: 1,752
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From: Vancouver, British Columbia, Canada
Re: What causes this and what is it called? (QWK SLVR)
I wonder if that is the Active handling kicking in and braking alternate sides of the car ?
I think that has happened to me a couple of times upon WOT acceleration merging onto a highway.
I think that has happened to me a couple of times upon WOT acceleration merging onto a highway.
Thread Starter
Le Mans Master
Joined: Nov 2000
Posts: 7,020
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From: Durham NC
Re: What causes this and what is it called? (XmentalPilot)
Interesting theory. I'll try that. The road is far from smooth and I did not notice AH kicking in. Then again, I watch the road more than the gauges!
Advanced
Joined: Aug 2001
Posts: 93
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From: Dublin Ca.
Re: What causes this and what is it called? (QWK SLVR)
What ever happened to KISS (Keep it simple stupid) principal?
Good old fashion 2nd gear bark, maybe???
A little tire spin upon full power shift, (traction control woks AFTER it detects wheel spin, not as a full 100% preventive) I live for that feeling.. It could also be as others have said Bump steer in effect
:lol: :cheers: :confused:
Good old fashion 2nd gear bark, maybe???
A little tire spin upon full power shift, (traction control woks AFTER it detects wheel spin, not as a full 100% preventive) I live for that feeling.. It could also be as others have said Bump steer in effect
:lol: :cheers: :confused: