over and under steer 101
08-09-2012, 05:50 PM
#16
And, this also makes sense with all the other methods mentioned as well:
- increased tire pressure = more spring = more ride height = more push (at that end)
- decreased tire pressure = less spring = less ride height = more grip (at that end)
I am removing the conversation of street tires that may need more psi because of overly soft sidewalls that basically collapse with track side loads - in that case, and from very low psi, increasing psi may in fact increase grip
08-09-2012, 06:59 PM
#17
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I still stand by my statement that the first 2 are backwards - I only used 40psi as an example to make the point. I have never, ever, raised tire pressure to get more grip - ever. I lower tire pressure to get more grip at the end that needs more grip - obviously up to a point - these are small adjustments as you say.
And, this also makes sense with all the other methods mentioned as well:
- increased tire pressure = more spring = more ride height = more push (at that end)
- decreased tire pressure = less spring = less ride height = more grip (at that end)
I am removing the conversation of street tires that may need more psi because of overly soft sidewalls that basically collapse with track side loads - in that case, and from very low psi, increasing psi may in fact increase grip
And, this also makes sense with all the other methods mentioned as well:
- increased tire pressure = more spring = more ride height = more push (at that end)
- decreased tire pressure = less spring = less ride height = more grip (at that end)
I am removing the conversation of street tires that may need more psi because of overly soft sidewalls that basically collapse with track side loads - in that case, and from very low psi, increasing psi may in fact increase grip
08-09-2012, 07:04 PM
#18
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08-09-2012, 07:15 PM
#19
Race Director
Ok...so we all strive for a neutral car but if it goes 1 way or the other.....
who prefers and car that understeers?
who prefers a car that oversteers?
who prefers and car that understeers?
who prefers a car that oversteers?
08-09-2012, 07:19 PM
#20
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In a street GT3 I prefer slight understeer to lessen chance of *** coming around. Total neutral in a M3 and Z06. Cup car is a different animal, there are so much grip I treat it like a 50/50 M3 so I like it neutral
08-09-2012, 09:24 PM
#21
Drifting
Cole Trickle: Whoa. Her *** is all over the place.
Harry Hogge: When the rear end's loose, the car's fast. Loose is fast, and on the edge of out of control.
Harry Hogge: When the rear end's loose, the car's fast. Loose is fast, and on the edge of out of control.
08-09-2012, 09:48 PM
#22
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Great chart to print, take the track for a refresher or cheat sheet. One thing it leaves out is what the driver is doing to cause the OS/US and where did it first start. I see a lot of guys start chasing "handling issues" because of tire pressures or ride height but the real cause was a driver input with the throttle, brake or steering.
Be careful tuning your car as you can start making changes that will make the car worse than it already is.
Be careful tuning your car as you can start making changes that will make the car worse than it already is.
08-09-2012, 10:09 PM
#23
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08-09-2012, 11:05 PM
#24
Race Director
Great chart to print, take the track for a refresher or cheat sheet. One thing it leaves out is what the driver is doing to cause the OS/US and where did it first start. I see a lot of guys start chasing "handling issues" because of tire pressures or ride height but the real cause was a driver input with the throttle, brake or steering.
Be careful tuning your car as you can start making changes that will make the car worse than it already is.
Be careful tuning your car as you can start making changes that will make the car worse than it already is.
08-10-2012, 04:45 PM
#26
Rennlist Member
Great chart to print, take the track for a refresher or cheat sheet. One thing it leaves out is what the driver is doing to cause the OS/US and where did it first start. I see a lot of guys start chasing "handling issues" because of tire pressures or ride height but the real cause was a driver input with the throttle, brake or steering.
Be careful tuning your car as you can start making changes that will make the car worse than it already is.
Be careful tuning your car as you can start making changes that will make the car worse than it already is.
08-10-2012, 05:25 PM
#27
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Great chart to print, take the track for a refresher or cheat sheet. One thing it leaves out is what the driver is doing to cause the OS/US and where did it first start. I see a lot of guys start chasing "handling issues" because of tire pressures or ride height but the real cause was a driver input with the throttle, brake or steering.
Be careful tuning your car as you can start making changes that will make the car worse than it already is.
Be careful tuning your car as you can start making changes that will make the car worse than it already is.
