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Old 05-17-2000, 10:07 AM   #1
Dan00RS
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Question Auto-X on RE92's Questions!

I have been autocrossing for a few years now, but this weekend will be the first time with my new RS. I don't have the cash right now to splurge on new tires, so I have to run on the RE92's for a while. I know that this has been the subject of great debate, but I need to know what the best pressures are to run halfway decently. I've heard 46F and 39R. It is supposed to be 65 degrees and partly cloudy (according to weather.com). Anybody out there run auto-x on the stock tires?? Pressure recommendations?? Anybody, anybody??
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Old 05-17-2000, 10:12 AM   #2
boxerman
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My last autox I ran 45Fr 36Rr on the RE-92s. I had the tires chalked. I definately used the shoulder tread but I didn't seem to roll any more than that. It was about 70 degees in the morning warming up to mid 80's as the day went on. Curiously, it felt as if the tires gripped much better earlier in the day and then seemed to go away when it got warm.

Tim
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Old 05-17-2000, 10:15 AM   #3
ColinL
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Fortunately I only autocrossed the re92's once, but I noticed that same. Performed better cold, got greasy when hot. 4th run was ugly. Maybe it's my driving style, my Nexus do the same thing if I don't bleed off pressure. I just don't scuff the sidewall lettering with them.
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Old 05-17-2000, 10:17 AM   #4
Marius
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I won STS on those tires, it's all about the driver (flamesuit on)#8-P
44F 35R, rolled the sidewalls, but controllable at the limit.
Marius
99 RS blue
now on Kumho's...
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Old 05-17-2000, 10:19 AM   #5
Tony
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Sounds like a reasonable starting place. I ran a little higher than that, about 49/45 f/r. But don't take my word, or anyone elses, other than to find a starting place. Chalk your tires and adjust your pressures so that you are using all of the tread width and not rolling on to the sidewalls. The fronts will probably roll onto the sidewall no matter what pressure you run so you'll have to just see where the point of diminishing returns is for the fronts. Other than that, have fun toasting the RE92's.

Anyways, I think the RE92's are a great tire to learn to autox on. It doesn't matter if you shred them and you can learn to handle your car at the limit of traction at a slower speed. This way when you transition to better or even r-compound tires you'll know what to expect and how to deal with it.

Hope it helps and have fun.

Edit: Damn! Three replys while I was typing mine... I gotta type faster.

Tony

[This message has been edited by Tony (edited May 17, 2000).]
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Old 05-17-2000, 10:27 AM   #6
Patrick L
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Short and simple. The RE92s SUCK!!
I have run in 4 events and I am wearing the hell out of the front right tire. If you can. Get some better tires for Auto-X.
If your Running G-Stock, get the Kuhmo V700.
if you in STS, go for the Kuhmo 712 or Yoko AVS-I.
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Old 05-17-2000, 10:27 AM   #7
ColinL
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Marius, no doubt the driver is the limiting factor in my car's performance. I suck and know it, but I'm having fun and getting better.

Tony: did you autox those AVS S1 yet?
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Old 05-17-2000, 10:44 AM   #8
Tony
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ColinL,
No, missed the last one for a bachelor party in NY (well worth it!) and I'll be missing the next one due to a trip.

I'm waiting to post a review till I autox them. I can tell you the 225/50/ZR16's clear the strut but do rub slightly on the fender lip. The ultimate grip is about the same as the SP8000's but seem to transition and turn in better (not sure if thats the compound or the size making the difference there). Haven't had them in the wet yet.

They also sent me the damn Porsche O.E. version first so I had to send them back to get the regulars.

Tony

[This message has been edited by Tony (edited May 17, 2000).]
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Old 05-17-2000, 11:30 AM   #9
Tim K.
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I ran 4 or 5 autocrosses on the stock tires. I ran 42 psi up front and 40 in the rear. However, I did suffer terrible understeer. A bigger tire pressure differential may help offset that.

65 degrees? Where do you live? Just the other day it had already reached over 100 degrees here!
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Old 05-17-2000, 11:53 AM   #10
Dan00RS
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Talking

Thanks for the info everybody. Sounds like I will start with 45F 39R and go from there.


Tim K. - I live in Cleveland, OH. Not a warm here as the rest of the country. Oh well, I'll take this anyday over 100!! That's just way too friggin hot!!
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Old 05-17-2000, 02:13 PM   #11
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1 Have autoX'd twice.
once with RE-92's
once with Toyo Proxes T1's
obviously the T1's were a ton better, but the other major difference was that I ran the RE-92's in Feb on a mid 40's day and the Toyos ran last weekend in the 70's to 80's (Boxerman was there) From what I recall in Feb all of the guys running good tires were having a hard time. The RE-92's were not doing that bad. They didnt squeel that much and they gave a decent amount of grip. fast foward to last weekend...boxerman was having a tough time fighting the RE-92's on a warm (it felt hot) day.
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Old 05-17-2000, 02:30 PM   #12
boxerman
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TR,
Have you seen the final results from Sat. I am thinking of heading up to Orange County Airport this Sat. I think it is the closest autox. Must wear RE-92s down to cords before I buy new tires. Pray for rain.
Tim
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Old 05-17-2000, 02:40 PM   #13
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I used to run 44 front 32 rear.... and the sides rolled all they way to the middle of the letters during high speed cornering.... i put the fronts down to 42 now and it actually steers better... guess teh contact patch is bigger....
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Old 05-17-2000, 04:37 PM   #14
Tim K.
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Oh, I don't think I mentioned it, those tire pressures I quoted above were cold. First thing in the morning, before driving on them, take the pressure and then pump them up. =) I'd only confuse myself trying to differentiate between cold, warm, and hot tire temps vs. tire pressure.
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Old 05-17-2000, 05:38 PM   #15
Joe Lee
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I had the same experience as Boxerman... after running all winter and not thinking the RE92s were tooooo bad (slippery but not awful) I finally ran them on a warm day at E-Town... as they got warmer they got much MUCH worse!!! In fact, I won STS with my very first run and got SLOWER every subsequent run!! That has NEVER happened to me before.

I guess I'll be looking at the new Kumhos.
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Old 05-18-2000, 12:11 AM   #16
8Complex

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Dan00RS - Realize that your tire pressures are different hot and cold. I was running a warm 47/39 last time I ran (not hot, just warm). I ended up coming in 4th in my class after some shmuck (I coulda beat him, damnit!) and a couple of pro drivers on my first rally a few weeks ago on my RE92's.
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Old 05-18-2000, 12:22 AM   #17
boxerman
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Angry

Frickin NNJR SCCA region doesn't update thier website. I was looking for final results from Englishtown last Sat, but the most recent results they have posted was from Apr 9. C'mon guys get those results up there!

Tim
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Old 05-18-2000, 12:57 AM   #18
Dan00RS
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Thumbs up

8Complex - yeah I'm well too aware about the laws of the contraction and expansion of gasses (Boyle's Law???) I was just trying to get ideas for a good starting point. I have one of those small cigarette lighter powered air compressors (Campbell Hausfeld $9.99 at Wal-Mart!!) so I can mess with the pressures after each run. Thanks for the ideas guys!
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Old 05-18-2000, 06:40 AM   #19
boxerman
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I feel better, I wasn't imagining things. I am sure now that because they are all season, the compound is optimized for cold traction.

I am still up in the air about this weekend, but I was thinking that I might disconnect the front sway bar and max out the neg camber using the adjustment bolts at the knuckle. Has anyone tried this? I want to try to optimize the stock setup before I start throwing money at the understeer problem.

Tim
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Old 05-18-2000, 06:47 AM   #20
ColinL
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Yes, that is a very easy way to set your front camber. Just eyeball it, you can tell when the negative camber reaches maximum.
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