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  #1  
Old 06-10-2002, 08:58 AM
shahin shahin is offline
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Hello, please help me out with tire pressure

The sides of the tire seem to be wearing down and I was wondering if I should lessen the pressure in the tires or increase it. Also, what do you guys recommend for the pressure.

Last edited by shahin; 06-10-2002 at 09:05 AM.
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  #2  
Old 06-10-2002, 09:53 AM
TD
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Re: Hello, please help me out with tire pressure

Quote:
Originally posted by shahin
The sides of the tire seem to be wearing down and I was wondering if I should lessen the pressure in the tires or increase it. Also, what do you guys recommend for the pressure.
If the sides are wearing, that's a sign your pressures are too low (or that you're beating your car mercilessly).
  #3  
Old 06-10-2002, 09:54 AM
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Re: Re: Hello, please help me out with tire pressure

Quote:
Originally posted by TD


If the sides are wearing, that's a sign your pressures are too low (or that you're beating your car mercilessly).
E46 M3, right?

What pressures are you at?

TD is right
  #4  
Old 06-10-2002, 09:56 AM
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Re: Re: Re: Hello, please help me out with tire pressure

Quote:
Originally posted by nate328Ci


E46 M3, right?

What pressures are you at?

TD is right
Yeah, he doesn't specificy what car. Pressure recommendations differ for staggered vs non-staggered setups.
  #5  
Old 06-10-2002, 10:02 AM
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Re: Re: Re: Re: Hello, please help me out with tire pressure

Quote:
Originally posted by TD


Yeah, he doesn't specificy what car. Pressure recommendations differ for staggered vs non-staggered setups.
I suppose so, but I would stick to the factory recommendations in this car. It has an oversteer bias according to R&T
  #6  
Old 06-10-2002, 10:03 AM
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Re: Re: Re: Re: Re: Hello, please help me out with tire pressure

Quote:
Originally posted by nate328Ci


I suppose so, but I would stick to the factory recommendations in this car. It has an oversteer bias according to R&T
Oversteer?
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  #7  
Old 06-10-2002, 10:05 AM
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Re: Re: Re: Re: Re: Hello, please help me out with tire pressure

Quote:
Originally posted by nate328Ci


I suppose so, but I would stick to the factory recommendations in this car. It has an oversteer bias according to R&T
I ditto atyclb... "oversteer"?!?!?!
  #8  
Old 06-10-2002, 10:05 AM
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Re: Re: Re: Re: Re: Re: Hello, please help me out with tire pressure

Quote:
Originally posted by atyclb


Oversteer?
steer?

  #9  
Old 06-10-2002, 10:06 AM
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Re: Re: Re: Re: Re: Re: Hello, please help me out with tire pressure

Quote:
Originally posted by TD


I ditto atyclb... "oversteer"?!?!?!
http://www.dictionary.com/search?q=oversteer
  #10  
Old 06-10-2002, 10:08 AM
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Re: Re: Re: Re: Re: Re: Re: Hello, please help me out with tire pressure

Quote:
Originally posted by nate328Ci


http://www.dictionary.com/search?q=oversteer




http://www.brownandwilliamson.com/in...130%26Sect%3D3
  #11  
Old 06-10-2002, 10:11 AM
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Understeer is the problem
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  #12  
Old 06-10-2002, 10:15 AM
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We KNOW what over and understeer are. There is not one current production car that has inherent OVERsteer but many/most/damn near all have inherent UNDERsteer. The staggereed tire setup common on many SP BMWs exists solely to impart more UNDERsteer. Running factory tire pressures (which always call for LOWER pressures up front) also impart more UNDERsteer.
  #13  
Old 06-10-2002, 10:25 AM
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Quote:
Originally posted by TD
We KNOW what over and understeer are. There is not one current production car that has inherent OVERsteer but many/most/damn near all have inherent UNDERsteer. The staggereed tire setup common on many SP BMWs exists solely to impart more UNDERsteer. Running factory tire pressures (which always call for LOWER pressures up front) also impart more UNDERsteer.
Yes, I am familiar with this.

I have never driven a new M3 on the track, so I have to trust those that have. You haven't.

From R&T,

"To drive this car hard, I have to accept the fact that it needs to be sideways. It is almost a rally style of driving." "Tail-out fun that's easy to drive and pleasantly predictable when pushed." "with excellent balace and easy driver-induced oversteer" "I'd like to have a little more grip coming off the corner where I can really put some of that M power to the ground"

All of this implies to me, along with other things that I have read, that the E46 M3 needs more tire. It seems to exhibit light understeer at slower speeds, but be balanced or even oversteer prone at higher levels. I would like 245 front/ 275 rear on my M3.

btw, the Camaro (and Viper) are oversteer prone, not all modern cars are set up for it
  #14  
Old 06-10-2002, 10:38 AM
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I'd have to think "inherent" and "driver-induced" are 2 different things. I think the serious track people go 255 or 265 all the way around.

Most people buying new tires go 245/275 and use equal pressure all around.
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  #15  
Old 06-10-2002, 10:55 AM
shahin shahin is offline
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I have an m3 with 19 inch factory option. I went autocrossing yesterday and my pressures were at 39 front and 37 back. I was drifting alot.

I increased them this morning to 42 front and 40 back. Is this ok??
  #16  
Old 06-10-2002, 10:55 AM
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Quote:
Originally posted by atyclb
I'd have to think "inherent" and "driver-induced" are 2 different things. I think the serious track people go 255 or 265 all the way around.

Most people buying new tires go 245/275 and use equal pressure all around.
"I pick up a little mid-corner understeer off power, but as soon as I touch the thottle again, the back wants to be sideways. The only way I really find out haw to be smooth with it is just put my foot down on the throttle, get the tires spinning, and then ease it into a nice slide versus trying to correct it"

Do you want to go power off though the turns? 265s up front?
  #17  
Old 06-10-2002, 10:56 AM
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Quote:
Originally posted by shahin
I have an m3 with 19 inch factory option. I went autocrossing yesterday and my pressures were at 39 front and 37 back. I was drifting alot.

I increased them this morning to 42 front and 40 back. Is this ok??
You are drifting the car? Yea, higher pressures will keep the sidewalls from touching the pavement
  #18  
Old 06-10-2002, 01:04 PM
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Hey There

Hey Shahin -

Before the runs, was your car near the end of cars in the lot close to the entrance?

If it was, I'm sorry I didn't meet you, but we were admiring your wheels from over near the RVs.
  #19  
Old 06-10-2002, 01:19 PM
shahin shahin is offline
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Hey whats up. I knew I recognized you from somewhere. I had seen a picture of you at Cutter Motors; a picture that Jon Shafer posted. It was only till I read this post that I now recognize you. Sorry I didnt get a chance to meet you. Perhaps next time and thanks for the compliment.

BTW that was my car near the entrance. Silver on Red.
  #20  
Old 06-10-2002, 01:26 PM
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How did you do?

What class did you run, N or MS?

Have any results from yesterday? It will take 2 months before they get it on the LA BMW CCA site (if ever)
  #21  
Old 06-10-2002, 02:00 PM
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I was suppose to be in novice but i was put in M stock. It was my first time autocrossing in any car so it was an awesome experience for me. I was spending all of the practice time on my own so I could have fun with my car but I had an instructor with me on the timed runs. They were a lot slower cus I was listening to them for once and also insurance dosent cover the timed events. I was kinda paranoid after seeing that mustang crash into the tree video and the corvette hitting the course worker so I drove seriously. Unfortunately my best time was 70. In case you didnt know the best time was 64 I believe so I was off by a lot. I loved it and cant wait to do it again.
  #22  
Old 06-10-2002, 02:14 PM
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You'd probably kick my a**!

70 isn't too bad for 1st time if 64 was best. Hell, some of those race prepared M Coupes and E30 M3s are insane! How many cars in M Stock? That's probably where they would put me - maybe they don't let M cars in N class?

X Class looked interesting. A 360 Modena, Porsche 911, some Subaru WRXs, Audis and I heard a rumor that one of the Boxsters was a rental!
  #23  
Old 06-10-2002, 02:30 PM
shahin shahin is offline
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I dont even think they had an novice class because they didnt even give trophies out for it. Also, there was not too many cars in Mstock and I think they were all quicker than me by at least half a second. The Corolla out there was a rental. Damn they jacked it up. Im bringing my Hyundai hatchback next time; hopefully it wont flip.
  #24  
Old 06-10-2002, 02:58 PM
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What happened

I had to leave early (that's why I'm asking so many ?s).

What happened to the Corolla? I saw it out there before the run groups got going.
  #25  
Old 06-10-2002, 04:09 PM
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They totally abused the car. It was great.
 

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