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      03-02-2014, 03:34 PM   #1
VictorH
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What tire pressure AD08R

What tire pressures are you guys running with the AD08Rs? I just got a set, I assume the start point isn't that different than RE-11s I ran last season, but good to know what you guys are running, give me cold and hot pressures if you have them. Thanks
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      03-02-2014, 03:50 PM   #2
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Only been to one event with them...265/19/30 square ...-2.5 camber in front. Otherwise stock.

35 cold.....finishing up 40 hot.
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      03-02-2014, 06:03 PM   #3
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Seemed like they felt best at 40. Tried lowering to 38 and 36. Went slower but could have been the heat of the day
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      03-02-2014, 07:58 PM   #4
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I ran AD08s last season. Hopefully not apples/oranges.

I generally started at ~ 32 psi cold and ended up about 36-37 psi hot throughout the day. (On one particularly hot day (110F ambient) this ended up at 28 psi cold the next day.)

I'm not convinced that these were optimal, though. Car felt loose at times, but this may have been me overdriving.

I may try 40 psi hot like some others have, just to see.
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      03-02-2014, 08:25 PM   #5
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38-40 seems to be what I read for both AD08s and PSSes, with NT01s closer to 38. Keep in mind though that if you drive a cooldown lap, your pressures will have dropped somewhat from their peak during your laps by the time you check them, especially on a long track since the cooldown will have taken longer -- which could explain the variance in the recommended pressures.
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      03-02-2014, 08:28 PM   #6
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In my experience, 40 hot is the sweet spot. To achieve this I shoot for anywhere around 31-33 cold. Have been running the AD08's for 3 years and the R's for my last 3 events last year and found the pressures targets to be similar although the R's felt and performed better. Really looking forward to more experience with the R's this season. Let us know how it goes and have fun!
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      03-03-2014, 10:22 PM   #7
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To those that have run ad08r: how would you compare grip level, feel,and ability to tolerate heat compared to a RA1 or nitto 555rii?
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      03-07-2014, 02:56 PM   #8
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Ran them for the first time last weekend. It was almost too cold to move the car for tech in the morning. Anyway, I started 36 cold. This led to morning runs with hot of 38 and afternoon runs with hot of 40-41. I like the 40 range better. It was stable and sticky. P.S. this was on a light BMW not an E92 M3.
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      03-07-2014, 05:41 PM   #9
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Haven't been on the track yet but I can tell you based on the rubbing I'm getting over bigger bumps (no spacers) these tires run larger than the Bridgestone RE-11s. I was running 285 RE-11s in back with no issues but the 275 AD-08s rub on bumps on the same wheels.
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      03-07-2014, 06:34 PM   #10
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FWIW, Australian time attack teams are running these significantly lower -- 30-32 psi hot. I also found them to perform well at those lower pressures. As always, YMMV. I would encourage people to try both ends of the range.
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      03-07-2014, 07:32 PM   #11
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I'm stock non zcp e90. Would 265/30-19 and 275-30-19 fit on 220m?
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      03-07-2014, 08:01 PM   #12
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Quote:
Originally Posted by rhouck
FWIW, Australian time attack teams are running these significantly lower -- 30-32 psi hot. I also found them to perform well at those lower pressures. As always, YMMV. I would encourage people to try both ends of the range.
Interesting...will definitely give that a shot...and yes these are wider, even than the regular AD08's.
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      03-07-2014, 08:58 PM   #13
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Quote:
Originally Posted by 414hpbabyshuttle View Post
I'm stock non zcp e90. Would 265/30-19 and 275-30-19 fit on 220m?
I run 265/30/19 square on 359 (19x10) wheels with no issues
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      03-07-2014, 08:59 PM   #14
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Quote:
Originally Posted by rhouck View Post
FWIW, Australian time attack teams are running these significantly lower -- 30-32 psi hot. I also found them to perform well at those lower pressures. As always, YMMV. I would encourage people to try both ends of the range.
That seems really low...I'll give it a try and see what happens
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      03-07-2014, 09:04 PM   #15
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Quote:
Originally Posted by rhouck View Post
FWIW, Australian time attack teams are running these significantly lower -- 30-32 psi hot. I also found them to perform well at those lower pressures. As always, YMMV. I would encourage people to try both ends of the range.
Ideal pressure also depends on the cars weight and the tire size relative to weight. Heavier cars on smaller tires tend to need more pressure than lighter cars with wider tires.
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      04-26-2015, 05:54 AM   #16
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Here's an interesting read.

http://www.yokohama.com.au/News-and-...ace-tyres.aspx
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      04-26-2015, 09:05 AM   #17
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Quote:
Originally Posted by Billj747
Quote:
Originally Posted by rhouck View Post
FWIW, Australian time attack teams are running these significantly lower -- 30-32 psi hot. I also found them to perform well at those lower pressures. As always, YMMV. I would encourage people to try both ends of the range.
Ideal pressure also depends on the cars weight and the tire size relative to weight. Heavier cars on smaller tires tend to need more pressure than lighter cars with wider tires.
True. Same tire: The hot pressures are quite a bit lower on the ~800lb. lighter e46 M3 race car compared to the stock e92 M3.
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      04-26-2015, 08:10 PM   #18
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Quote:
Originally Posted by PrimeBMW
Quote:
Originally Posted by Billj747
Ideal pressure also depends on the cars weight and the tire size relative to weight. Heavier cars on smaller tires tend to need more pressure than lighter cars with wider tires.
True. Same tire: The hot pressures are quite a bit lower on the ~800lb. lighter e46 M3 race car compared to the stock e92 M3.
When I was talking to a pro Grand Am driver at CotA, he said that for street cars and street tires, a general guideline was 1 PSI hot for every 100 lbs of car plus people, so our cars would be around 39. Of course that's just a general guideline that may require tweaking based on car and/or tire, but when my AD08R's measure 40 hot after a cooldown, they felt greasy on track during that session. So now I try to keep them in the 37-38 range immediately after a cooldown (which is probably 40 on track), and that has consistently yielded a consistent tire feel throughout the session. I seem to remember Yokohama doing some sort of launch event with the AD08R's involving an M3 or similar car and the engineers at the event said to shoot for 38 hot.

But honestly if you think you're at the level where a pound or two of tire pressure makes a huge difference and you really care about that last tenth, you should be using a pyrometer, which will immediately and conclusively tell you the proper tire pressure for your car and driving style.
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      04-26-2015, 08:23 PM   #19
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I'm running 28psi to start. Grips like velcro for me. I end up around 35-37 hot. This is running on 275/30 fronts and 305/30 rears.....

GREAT tire is you want an all-arounder!!
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      04-26-2015, 08:43 PM   #20
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Quote:
Originally Posted by onutsguy
I'm running 28psi to start. Grips like velcro for me. I end up around 35-37 hot. This is running on 275/30 fronts and 305/30 rears.....

GREAT tire is you want an all-arounder!!
Yeah I start 28F 29R and that usually puts me around 38 right after a cooldown. Agreed on this tire as an all-rounder!
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      04-27-2015, 01:08 PM   #21
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I'm another one in the camp of 38-39 hot (275/35/18 AD08). I used them for 14 days on track in that range and they held up great.
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      05-06-2015, 10:13 AM   #22
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Quote:
Originally Posted by bkrM3 View Post
I'm another one in the camp of 38-39 hot (275/35/18 AD08). I used them for 14 days on track in that range and they held up great.
that is an impressive amount of track days for the tires. would you buy them again?
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