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Thread: What is the recommended tire air pressure for the E46 BMW 330 ZHP?

  1. #21
    Join Date
    Jan 1970
    Location
    Lebanon, OH
    Posts
    37,867
    I am runnin 32/38 F/R now...

    Droid + Tapatalk = FTW!
    "Flame suit NOT REQUIRED!!!"
    Call Me Dane l 2/2004 330i ZHP l 18x8 ET45 BBS CK's wrapped with Michelin Pilot Sport AS3+ @ 245-40-18 l KW V1 Coilovers in front l KW V1 springs w/ Bilstein B8 dampeners in rear l BMW Performance Rotors l UUC StrutBarbarian l Racing Dynamics Rear Strut Bar l Jim Conforti Shark Injector l Light Birch Interior Trim l Bimmian Celly Mount l M3 Trunk Mat l l e90 Performance E-Brake & Shift Knob l M3 Tri-Stitched Boots l AL Headlight Retrofit with ZKW Lenses l CobyWheel Wrap w/M3 Stitching l LCM sw 4.5 triple blink and rear fogs

  2. #22
    Join Date
    Jan 1970
    Location
    Grand Forks, ND
    Posts
    685
    I run 33 all around in most of my cars. As others have mentioned, the recommended pressure induces understeer. It helps keep the average American driver out of trouble since understeer is easier to control than oversteer if you have no idea what you're doing (which most don't since our driver training sucks). Same reason BMW went with with a staggered setup on the 96 M3 since so many people were crashing their 95s.

    46 is insanely high though. When I first bought the zhp, I was at a tire shop and the tech looked at me weird and explained that he has to air up to what the sticker says for liability reasons. I told him ok, I left the shop... and as soon as I could, I pulled over, looked at the sticker in shock and drained 13 psi from the rear tires.

  3. #23
    Join Date
    Jan 1970
    Location
    Lebanon, OH
    Posts
    37,867
    After I got them mounted and balanced they were 48 front and rear...lol. I could tell....
    "Flame suit NOT REQUIRED!!!"
    Call Me Dane l 2/2004 330i ZHP l 18x8 ET45 BBS CK's wrapped with Michelin Pilot Sport AS3+ @ 245-40-18 l KW V1 Coilovers in front l KW V1 springs w/ Bilstein B8 dampeners in rear l BMW Performance Rotors l UUC StrutBarbarian l Racing Dynamics Rear Strut Bar l Jim Conforti Shark Injector l Light Birch Interior Trim l Bimmian Celly Mount l M3 Trunk Mat l l e90 Performance E-Brake & Shift Knob l M3 Tri-Stitched Boots l AL Headlight Retrofit with ZKW Lenses l CobyWheel Wrap w/M3 Stitching l LCM sw 4.5 triple blink and rear fogs

  4. #24
    Join Date
    Jan 1970
    Location
    Jersey Shore
    Posts
    384
    I ran on 32 all around last year when I got the car.....decided to go 34, 38 this year and my mpg's went from 22.3 to 23.9. Better feel too!

    DROID2>YourPhone

    03 TiAg 330i ZHP
    -Alex

  5. #25
    33 - 35 all around. Low PSI upfront makes the wheels more prone to bents. BMW's recommended setting gives way too much under-steer for my liking.

  6. #26
    Join Date
    Jun 2011
    Location
    Southampton, NJ. 08088
    Posts
    43
    The tire pressures on the door plate were written buy lawyers. They want higher pressures
    for liability reasons.
    Inside your drivers manual is where you will find the proper tire pressures.
    Regards, Walt.

  7. #27
    Join Date
    Jan 1970
    Location
    Lebanon, OH
    Posts
    37,867
    Quote Originally Posted by balticvid View Post
    The tire pressures on the door plate were written buy lawyers. They want higher pressures
    for liability reasons.
    Inside your drivers manual is where you will find the proper tire pressures.
    For comparison sake.



    "Flame suit NOT REQUIRED!!!"
    Call Me Dane l 2/2004 330i ZHP l 18x8 ET45 BBS CK's wrapped with Michelin Pilot Sport AS3+ @ 245-40-18 l KW V1 Coilovers in front l KW V1 springs w/ Bilstein B8 dampeners in rear l BMW Performance Rotors l UUC StrutBarbarian l Racing Dynamics Rear Strut Bar l Jim Conforti Shark Injector l Light Birch Interior Trim l Bimmian Celly Mount l M3 Trunk Mat l l e90 Performance E-Brake & Shift Knob l M3 Tri-Stitched Boots l AL Headlight Retrofit with ZKW Lenses l CobyWheel Wrap w/M3 Stitching l LCM sw 4.5 triple blink and rear fogs

  8. #28
    nike001 Guest
    I think I run 33/38 or something like that.

    I'm having trouble finding a good pressure to run at for my 17 winters though. IIRC, i ran 33-34 PSI in them and I have center tire wear :/

  9. #29
    I'm having trouble finding a good pressure to run at for my 17 winters though. IIRC, i ran 33-34 PSI in them and I have center tire wear :/
    Seems unusual for this wear to be due to those tire pressures. For winter I have 17" wheels with 205/50 tires and run 34 all around. Wear has been fine. Agree that for summer tires the 32/38 setting creates too much understeer. Prefer 36/38.

  10. #30
    nike001 Guest
    Autozone.com
    Quote Originally Posted by jsfbmw View Post
    Seems unusual for this wear to be due to those tire pressures. For winter I have 17" wheels with 205/50 tires and run 34 all around. Wear has been fine. Agree that for summer tires the 32/38 setting creates too much understeer. Prefer 36/38.
    I had middle wear, but I just assumed it was because fun in the snow (DSC off ) so I just went with it.

    But the other day while cleaning the garage and moving the tires, it seemed the tires made sort of a U shape while rolling across my garage floor

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