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Old 07-24-2007, 11:38 PM   #1
Storz
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Default Tire Pressure

First autocross in the TI coming up on Sunday, stock suspension (active) and I am running Yokohama Avids. What is a good starting pressure. I used to run my Impreza at like 42 front/46 rear and it seemed to rotate well.
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Old 07-25-2007, 02:06 AM   #2
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I am not familiar with those tires, but I'm assuming they're a street tire. Safe bet would be 42-44 front, 40ish in the rear. The rear end will be all over the place anyways, no need to aggregate it by putting more pressure back there. I ran street tires on mine a couple of times ( Dunlop FM 901s) and had the best feel at 42f, 38r. Best of luck!


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Old 07-25-2007, 02:43 AM   #3
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Thanks
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Old 07-27-2007, 04:28 PM   #4
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I like my tires to be somewhere around 39-40 in the front, hot. And 38 or so in the rear, hot. Anything more than that, 42 range, and it is noticable that the tire is getting a lot of wear from bulging in the middle and the outside edge has hardly any wear. This is kumho mx's.

46/42 seems way to high to me for a cold pressure. You are not going to get the tires super hot on a short auto-x course, but most tires max out around 50 or 51, so you are pretty close to maxing out. Doing 30 minute DE sessions my pressure goes up 6-8PSI. So cold I start out around 33 in the front and 31/32 in the rear.
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Old 06-24-2016, 04:13 PM   #5
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Interesting. I m running my Toyo R1Rs at 36lbsf 35R hot. Would that be too low? What tire temp is considered hot? (I have a reader)

I am interested in any good sources to learn more on tire dynamics id anyone knows of a good source for a Newbie to read. Thanks!
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Old 06-27-2016, 04:56 PM   #6
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found this

http://www.turnfast.com/tech_handling/handling_pressure

and with mine ( semi slicks ) 24 to 26 PSI cold
deflate to 30 hot if higher

for me hot is after 3 turns, = the operational or optimal temp for them 50° to 70°C
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Old 06-27-2016, 09:26 PM   #7
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Thanks Sam! I'll read through this evening. Much appreciated. Merci! Au revoir!


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1998 318ti Sport - "Max" Schwartz II/Schwartz sport interior, S52
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1997 318ti Sport - "Huera" - RIP
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Old 07-03-2016, 03:12 PM   #8
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Sam, thanks for the post. Good reading which I will work on next week at Thunderhill. Cheers!
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1998 318ti Sport - "Max" Schwartz II/Schwartz sport interior, S52
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1997 318ti Sport - "Huera" - RIP
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Old 08-02-2016, 06:50 PM   #9
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Default Tire Pressure

I put together a quick post session checklist to remember and record readings for track vs. AutoX tire temps and pressures. Suspension adjustments and which tires/wheels I am using as well.


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1998 318ti Sport - "Cali" Schwartz II/Schwartz sport interior, Cali top
1998 318ti Sport - "Max" Schwartz II/Schwartz sport interior, S52
1997 318ti Sport - "Tiny" Schwartz II/Schwartz sport interior
1995 318ti Active - "Blanca" Alpineweib III/Schwartz leather interior

Other Current Bimmers: 2006 530i / 2000 2.3L Z3 / 1997 1.9L Z3 / 1999 540it

1997 318ti Sport - "Huera" - RIP
1995 318ti Active - RIP
1995 318ti Sport - "Tiny" Sold
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1985 635csi sold
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1984 318i sold

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Old 08-12-2016, 03:48 AM   #10
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OK, different tire, Bridgestone RE-71Rs I believe they gave my best lap at 37lbs hot at 75 degrees air temp after a 20 minute track run.

I went with lesser tire pressures and ended up with lower lap times and a spin at 34 lbs hot. ( to be fair, I was going a bit faster tho...) I will start again at 32 cold to heat up to 37lbs and work laps there/ 37 front/36 rear.

Joe, my outside of the RE-71Rs wore out faster than my insides of the tire. -2.7 degree of camber. Is that what you and TeenTI are experiencing?

Rich
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1998 318ti Sport - "Max" Schwartz II/Schwartz sport interior, S52
1997 318ti Sport - "Tiny" Schwartz II/Schwartz sport interior
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Other Current Bimmers: 2006 530i / 2000 2.3L Z3 / 1997 1.9L Z3 / 1999 540it

1997 318ti Sport - "Huera" - RIP
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1991 318ic - "Bert" - Sold
1985 635csi sold
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1984 318i sold

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Old 08-12-2016, 12:41 PM   #11
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Yes, I am experiencing the same thing. We are at -4 camber and 1 degree to out on both front wheels and the outsides are definitely wearing faster than the insides. How is the wear on the center strip of the tire? Our is really funky. I have been trying to post pictures of them the site wont let me for some reason. The outside half of the center tread section has already worn down to the wear bars. I am going to have to dismount them to rotate to the other side of the car. Keep me posted on the wear! That being said, I love those tires! They are sticky!
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