Jun 2, 2008 8:03:58 PM
Jun 2, 2008 8:19:12 PM
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ResB said:
Does switching PSM off on the 997 assist with understeer particularly on the track?
Jun 2, 2008 8:27:46 PM
Jun 2, 2008 8:39:14 PM
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rantanplan said:
u will only be able to truely find out what ur carrera s is capable of when switching the PSM off. otherwise u wont be able to feel the car to the same extend..and yes, it will definately overstear, but thats the purpose;) right..?
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Trundle_GT3 said:Quote:
ResB said:
Does switching PSM off on the 997 assist with understeer particularly on the track?
In a word NO
If you are experiencing alot of understeer most likely you are overdriving the car. If the car is not turning the reaction that most do is to turn the wheel more...which is the wrong correction.
Leave PSM on, its parameters are quite wide.
Do yourself a favor and attend a high performance driving school (PSDS) to better learn vehicle dynamics and car control. Money well spent!
Jun 2, 2008 8:44:27 PM
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Carlos from Spain said:
Like Antonio says, with PSM off you will decrease the understeer since it will allow for oversteer to occur, controlled or uncontrolled.
PSM tries to control the car when the car looses it "pose", but if its too much for the PSM to counter (laws of physics still apply) and the car is going to go, instead of letting whatever happen, it will try to induce understeer (the least bad of the scenarious) so that it is easier to recuperate control by simply lifting the throttle, otherwise you can spin through ovesteer, get snap-oversteer, etc. Thats why you get so much understeer with PSM.
I have found though that with Sport Chrono ON, if you are progressive you can get a reasonable amount of oversteer without the PSM getting to the point of inducing understeer. SO that it doesn't get in the way much. Have you tried the sport button?
Jun 2, 2008 8:48:37 PM
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Trundle_GT3 said:Quote:
ResB said:
Does switching PSM off on the 997 assist with understeer particularly on the track?
In a word NO
If you are experiencing alot of understeer most likely you are overdriving the car....
Jun 2, 2008 9:00:50 PM
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ADias said:Quote:
Trundle_GT3 said:Quote:
ResB said:
Does switching PSM off on the 997 assist with understeer particularly on the track?
In a word NO
If you are experiencing alot of understeer most likely you are overdriving the car....
Or... his alignment could be way off...
Jun 2, 2008 9:12:50 PM
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Carlos from Spain said:
True that if you are getting severe understeer constantly it means that you are pushing the car too much causing PSM to kick in excesively and you should "go slower to go faster" or a grip problem like worn tires, alignment being way off, etc. But that is not what I think ResB is complaining about, I think he is complaining of the character of the car's handling being so much prone to understeer due to PSM
The rpoble is that with PSM "on" ALL you get is understeer, you can't get oversteer so its normal to complain of it being prone to understeer with it ON even if the car is OK, and if its not, you still get understeer so that wouldn't change things.
With PSM off you would be getting both depending on the situation, but with it ON you get understeer, and more understeer.
Jun 2, 2008 11:17:44 PM
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ResB said: So, if disabling PSM induces the possibility of oversteer, then the answer must surely be yes, understeer will be less, but to what extent will only be found out on the track.
Jun 3, 2008 3:10:59 AM
Jun 3, 2008 4:11:17 AM
Jun 3, 2008 5:03:49 AM
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Silver Bullet said:...
TO minimize understeer, remember the slow in and fast out rule (using trail braking as part of the slow in), and secondly, treat the gas pedal like a dial rather than an on/off switch. Finally, smooth weight transfers rather than jerky ones help to eliminate understeer.
When you do feel understeer, come off of the gas, slow down, and let the car turn.
PSM doesn't cause understeer; believe it or not, it actually helps correct it by doing what I outlined above.
Jun 3, 2008 7:43:26 AM
Jun 3, 2008 10:00:17 AM
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Silver Bullet said:
Finally, smooth weight transfers rather than jerky ones help to eliminate understeer.
Jun 3, 2008 11:55:01 AM
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Silver Bullet said:Under and oversteer happen under different circumstances, so how PSM handles one dosen't really influence the other.
PSM doesn't cause understeer; believe it or not, it actually helps correct it by doing what I outlined above.
Jun 3, 2008 12:59:24 PM
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Carlos from Spain said:Quote:
Silver Bullet said:Under and oversteer happen under different circumstances, so how PSM handles one dosen't really influence the other.
PSM doesn't cause understeer; believe it or not, it actually helps correct it by doing what I outlined above.
It does because when the car tends to understeer (coming in too fast into a corner for example) the PSM will correct it but if its overwhealming it will understeer regardless of PSM. However, if the car is in another situation were oversteer is induced (too much throttle or too early on the exit of a corner or trailbraking into a corner for example), PSM again will correct it but if its if its overwhealming, you will not oversteer however, PSM will induce understeer so that if it goes, at least it doesn't go in oversteer since that would be much more dangerous because you spin.
So while PSM helps correct under and oversteer, if it can't it will only allow one to occur for safety reasons.
For example, there is ice or mud in a corner at the track and you floor violently the throttle at mid corner. Without PSM in a RWD car you will instantly go into oversteer and likely spin. Yet if you try this with PSM "on" you will not oversteer, you will always run wide with understeer no matter what, time and time again. You won't spin, you simply let off the throttle, open up the steering angle a bit and regain control. Thats the PSM inducing understeer rather than allowing you to spin. Thats why with PSM all you notince when you loose traction is understeer. Unless you activatre the sport button in sport chrono cars, in that case there is a significant amount of oversteer allowed and PSM is much harder to kick in, usually not at all even at the track unless you make a mistake.
In fact I will likely be doing this PSM on vs off tests tomorrow at the track, if I'm able to get some video I will upload it.
Jun 3, 2008 1:46:16 PM
Jun 4, 2008 2:33:41 AM
Jun 4, 2008 3:41:18 AM
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Carlos from Spain said:Quote:
cibergypsy said:Carlos, aquí tienes a un aficionado que estará esperando ansiosamente tus vídeos en la pista. Gracias.
Thank you ciberypsy, that is perfect spanish, is it your mother tongue?
Jun 5, 2008 7:12:13 AM
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rantanplan said:
Carrera S oversteering...
Jun 5, 2008 7:00:44 PM
Jun 6, 2008 5:26:03 AM
Jun 6, 2008 8:45:02 AM