[HELP] Suspension setting to reduce oversteer
11-09-2010, 12:17 AM
#11
Originally Posted by robinson,Nov 8 2010, 11:15 AM
Lower your tire pressure to 32 PSI, put the stock rear sway bar back on. That should make a big difference.
do this . You likely won't have to run the rear end so soft after this.Get some more seat time in the car after that. Take it to an empty parking lot on a wet day and play around with it. You shouldn't have much issue on dry pavement, wet seems to be more tricky on ap1's.
11-09-2010, 05:53 AM
#12
Originally Posted by ousi,Nov 9 2010, 01:26 AM
It seems like the rear is now much more planted to the ground when I soften the suspension and lowered the rear tire pressure.
Still, the spinning was mysterious as if something pushed the tail of my car during the corner.
I don't remember the brand of the tire, will check later.
Still, the spinning was mysterious as if something pushed the tail of my car during the corner.
I don't remember the brand of the tire, will check later.
If you get the chance, and I know the rear sway bar is a PITA, I'd swap it out for the stock one, or even better, just disconnect one of the sides. That will net you a lot more rear traction, which means you could add more front traction to help ballance it out.
11-09-2010, 06:13 AM
#13
You say you are running stock spec tires but the stock tires were wider in the rear than the rating would indicate. What brand and size of tires do you have on the car?
Tires of the same size vary in width. I've seen as much as a 2" variance for the same rated size tire. When I originally bought new tires for my '02 I went with 255s on the rear and they were 1/2" narrower than stock rather than wider as I expected. I had terminal oversteer. I've since learned to look for actual widths and not just rated widths.
Tires of the same size vary in width. I've seen as much as a 2" variance for the same rated size tire. When I originally bought new tires for my '02 I went with 255s on the rear and they were 1/2" narrower than stock rather than wider as I expected. I had terminal oversteer. I've since learned to look for actual widths and not just rated widths.
11-09-2010, 11:33 AM
#14
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I guess I know the reason why...
It's probably not my fault. The engine sometimes will surge when cold, and I guess when I was at that corner, engine surges which is exactly like a momentarily lift-throttle action. That will surely ended up in a drift and as I was not prepared - and spin as the result.
I'll follow up with my mechanic (the one who rebuilt the engine) about what's up with the car...
Meanwhile, I'll stop driving it on rainy days and try to avoid twisty roads when the engine is still cold.
Thank you!
It's probably not my fault. The engine sometimes will surge when cold, and I guess when I was at that corner, engine surges which is exactly like a momentarily lift-throttle action. That will surely ended up in a drift and as I was not prepared - and spin as the result.
I'll follow up with my mechanic (the one who rebuilt the engine) about what's up with the car...
Meanwhile, I'll stop driving it on rainy days and try to avoid twisty roads when the engine is still cold.
Thank you!
11-11-2010, 09:49 AM
#15
Originally Posted by Wildncrazy,Nov 9 2010, 07:13 AM
You say you are running stock spec tires but the stock tires were wider in the rear than the rating would indicate. What brand and size of tires do you have on the car?
Tires of the same size vary in width. I've seen as much as a 2" variance for the same rated size tire. When I originally bought new tires for my '02 I went with 255s on the rear and they were 1/2" narrower than stock rather than wider as I expected. I had terminal oversteer. I've since learned to look for actual widths and not just rated widths.
Tires of the same size vary in width. I've seen as much as a 2" variance for the same rated size tire. When I originally bought new tires for my '02 I went with 255s on the rear and they were 1/2" narrower than stock rather than wider as I expected. I had terminal oversteer. I've since learned to look for actual widths and not just rated widths.
The difference between the original front and rear tires on AP1s is extreme, and well-documented (see sticky at the top of Wheel & Tire forum). You need to be very careful when replacing tires on AP1s.
11-14-2010, 04:48 AM
#16
My experience with the S is when adding rigidity to the chassis you can over emphasize the existing tendency to oversteer. Some have said to reinstall the OE rear sway bar and that may reduce the problem. My suggestion is to leave the car as is and have the alignment checked and changed. Adding a little bit of toe in on the rear can make a world of difference. I did this on my set up and the car tracks like it's on rails now. I can take corners without even a squeal from the tires. Here are the details of my car.
02 AP1
18" OZ wheels
225 & 255 Bridgestone RE01-R
PSS9
Swift front sway bar
Rear toe in
Lastly, I do autocross from time to time and this set up has made a HUGE change is the behavior of the rear.
02 AP1
18" OZ wheels
225 & 255 Bridgestone RE01-R
PSS9
Swift front sway bar
Rear toe in
Lastly, I do autocross from time to time and this set up has made a HUGE change is the behavior of the rear.
11-17-2010, 06:24 PM
#19
as 02S2Grand alluded to, you should also check the alignment, as your rear toe might not be toed in enough. people who track / autox tend to set these cars up to oversteer more than what your typical road driver would expect. i would go get it aligned to more normal specs.
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