Mongo

ummm.... go back to a stock sway bar may help it.

SharkSkin

This would reduce the push, and probably give you a somewhat tighter turning radius. All of the Devek bars that I've seen installed have had marks where the wheel rubs at full lock. Also, the stock bar won't rip the swaybar mounts off of the body. If you're going to keep that swaybar, you should reinforce the mounts. Also, see how much understeer you can dial out with tire pressure. If that doesn't get you there and you want to keep the front bar, you may need a stiffer rear bar.

RKD in OKC

Well, the big blue front Devek bar does look like it's adjustable. I just want to be careful not to make the car loose in high speed turns. That's why I am looking for reasons why changing the front to rear stagger that should have taken out understeer had the opposite effect.

mark kibort

the devek blue bar should have extentions at the ends.
again the rear tire by one size wont do much of anything in the rear. what you have found is a tire difference up front that has caused the push. lessing the bar will probably help. it wont effect much at high speed.

SharkSkin

Most likely, you had reasonable tire pressure to begin with, and the new tires were set up with the pressure much too high. Also, as has been mentioned, you need to burn the "skin" off before you can really tell where you stand.

Mongo

Seriously - try 36 psi all the way around and go back to the stock front bar. Call us in the morning

SharkSkin

Andy, IMHO 36psi cold is still a bit high, but it depends on the tire...

mark kibort

WAY TOO HIGH!! Bad advice. I think you all remember the story of the NSX boys that were at a track day where I was helping out. all 5 of the NSX boys were spinning out at some point on the track every session. When I met with one to help out a little, i asked about tire pressure. they alll were set at 40psi cold. I told the entire group to lower the pressures to 30psi all the way around. they looked at me like I was crazy. someone validated me as someone that knew a little about this stuff and they complied. no one went off track or was pointed backward the rest of the day. they all liked the way their cars handed with the different tire pressures. hot pressures were about 35psi on average for the group. all true street tires of different brands on all of the NSX's

mk

ew928

Er, why is this thread tagged with '924'?

40psi cold. Wonder how high the pressures went when hot.

Mongo

I have 225s and 255s in the rear on 17" wheels and have not noticed any difference in tire wear, nor any pushing/plowing effects. I suppose he could do 32 all around, but the car feels a little sloppy at only 4 psi difference to me. 36 is good for street though and if you're not doing hard driving. If you are, then I'd advocate 32 because the pressures will go up.

mark kibort

36 feels good, because thats about where the tire is designed to operate. However, feeling good is relative. on the street, you might see only a couple of psi rise, unless you are running down the hyway, on a hot day. (ive measured tread temps of near 150degrees going to LA on hyway 5 )

at 30psi on a track, the tires will see at least, a 5psi pressure rise.

mk

Mongo

I use 36 with absolutely no intension on tracking the car. A small PSI increase is irrelevant on street driving. If I see anymore abnormal wear than I will drop it again. However, with over 11,000 miles on a set of 320 treadwear Fuzion ZRi's, I have no problems in abnormal tread reduction and still have a good 75% left on it.

SharkSkin

I had to go to 30F/28R to get my 225/255x17 Yokos to wear evenly. The KDWs needed an extra 1psi each to get even temps across the tread. YMMV.

Mongo

I had ES100s before...seemed like no matter what pressure I used, the things wore like no tomorrow.

IcemanG17

I do start the widows tires at 30psi cold...which ends up 37ish in front and 36ish rear....or at least thats what I lower it to coming on track hot...