Proper PSI for low profile tires?

Calbears · Fri, Apr-01-2011, 06:50:00 AM

Hi All,

I just recently joined the M3 forum and wanted to know if any of you have low profile tires on 19'' rims, 235F/285R and what psi are you putting in? When I got the car it had 35 psi and after going to some independent car shop for oil change the flat tire sensor came on. I tried to reset but it would come back on within a few minutes. What didn't make sense was after more psi was put into the tire the sensor for flat tire came on?

Anyone ever had this happen before? Apparently the indy shop put in 42 psi on all 4 tires, anyone have any recommendation for low profile tires with the above dimension and recommended psi that's in median range?

Thanks!

Foo2rama · Fri, Apr-01-2011, 07:03:02 AM

I run around 38psi

open your manual and read how to reset the tire pressure warning (I forget how atm.) The e46 M does not use sensors in the tire, it uses wheel speed sensors.

RynoS54 · Fri, Apr-01-2011, 07:54:41 AM

42psi cold? I go with 36psi cold but if you're within 34-38 you'll be good IMO...

BMTRW · Fri, Apr-01-2011, 08:02:10 AM

Quote:

Originally Posted by Calbears

Hi All,

I just recently joined the M3 forum and wanted to know if any of you have low profile tires on 19'' rims, 235F/285R and what psi are you putting in? When I got the car it had 35 psi and after going to some independent car shop for oil change the flat tire sensor came on. I tried to reset but it would come back on within a few minutes. What didn't make sense was after more psi was put into the tire the sensor for flat tire came on?

Anyone ever had this happen before? Apparently the indy shop put in 42 psi on all 4 tires, anyone have any recommendation for low profile tires with the above dimension and recommended psi that's in median range?

Thanks!

I have the stock 19" rims 295 in the back I put 42psi it goes away then comes back after like 20 min of driving so I gave up on it. I really do not care about any lights in my car accept the check engine light.

lmtfi · Fri, Apr-01-2011, 12:07:26 PM

35-36 square, cold. 42 cold is a sign that someone doesn't know what they are doing - assuming you aren't hauling 3-4 passengers all the time.

If you have a TPS warning - you have inconsistent same-axle pressures. Check them.

WytLytnyn · Fri, Apr-01-2011, 02:21:54 PM

38psi all around FTW.

d0ster · Fri, Apr-01-2011, 03:00:04 PM

Quote:

Originally Posted by Foo2rama

I run around 38psi

open your manual and read how to reset the tire pressure warning (I forget how atm.) The e46 M does not use sensors in the tire, it uses wheel speed sensors.

IIRC rubber valve stems=sensor in tire and metal valve stems=wheel speed sensors.
I run 35F and 36R.

Mr.G3 · Fri, Apr-01-2011, 03:04:22 PM

i guess im the only running more psi in the fronts than the rears- 37f/35r cold for street use - i feel the more psi in the fronts helps acceleration, since the car is pushing rather than pulling (RWD)- so I take off from the inertia of the front tires

Vox Populi · Fri, Apr-01-2011, 03:29:09 PM

i go by what I've seen as the prevailing numbers found in other threads like this:

39f/37r

Foo2rama · Fri, Apr-01-2011, 05:06:17 PM

Quote:

Originally Posted by d0ster

IIRC rubber valve stems=sensor in tire and metal valve stems=wheel speed sensors.
I run 35F and 36R.

No e46 M3 has in tire pressure sensors.

Also never heard that is true on other cars.

Fri, Apr-01-2011, 06:50:00 AM	#1
Calbears Calbears Join Date: Apr 2011 Posts: 4 Reputation: 0	Proper PSI for low profile tires? Hi All, I just recently joined the M3 forum and wanted to know if any of you have low profile tires on 19'' rims, 235F/285R and what psi are you putting in? When I got the car it had 35 psi and after going to some independent car shop for oil change the flat tire sensor came on. I tried to reset but it would come back on within a few minutes. What didn't make sense was after more psi was put into the tire the sensor for flat tire came on? Anyone ever had this happen before? Apparently the indy shop put in 42 psi on all 4 tires, anyone have any recommendation for low profile tires with the above dimension and recommended psi that's in median range? Thanks!

Fri, Apr-01-2011, 07:03:02 AM	#2
Foo2rama 2004 E46 M3 Join Date: Oct 2007 Age: 36 Posts: 4,248 In the garage: '04 BMW M3 Reputation: 0 Location: Costa Mesa	Re: Proper PSI for low profile tires? I run around 38psi open your manual and read how to reset the tire pressure warning (I forget how atm.) The e46 M does not use sensors in the tire, it uses wheel speed sensors. __________________ __________________ 2004 Mystic Blau Imola Rot ///M3 Coupe SMG Other Rides 73- 240z - L28 Block w e31 heads - prepping as a track toy 95- Legend Coupe - C32A5 block - totaled while parked 96- Dodge Ram 4x4 5.9 - totaled while parked in a seperate incident

Fri, Apr-01-2011, 07:54:41 AM	#3
RynoS54 wants +28 TE37s Join Date: Jan 2007 Posts: 2,996 Reputation: 0	Re: Proper PSI for low profile tires? 42psi cold? I go with 36psi cold but if you're within 34-38 you'll be good IMO... __________________ CB/GRAY Last edited by RynoS54; Fri, Apr-01-2011 at 07:57:57 AM.

Fri, Apr-01-2011, 12:07:26 PM	#5
lmtfi Registered User Join Date: May 2005 Posts: 5,061 Reputation: 0	Re: Proper PSI for low profile tires? 35-36 square, cold. 42 cold is a sign that someone doesn't know what they are doing - assuming you aren't hauling 3-4 passengers all the time. If you have a TPS warning - you have inconsistent same-axle pressures. Check them. __________________

Fri, Apr-01-2011, 02:21:54 PM	#6
WytLytnyn Registered User Join Date: Nov 2002 Posts: 1,220 In the garage: '05 BMW M3 Reputation: 0 Location: Atlanta	Re: Proper PSI for low profile tires? 38psi all around FTW. __________________ Current: 2005 Titaniumsilber M3 Coupe Dinan Stage 1 software UUC EVO 3 + DSSR Look Ma! No sunroof! "Wood" trim! Unpowered Cloth Seats! NAV! Michelin Pilot Super Sports on OEM 19's "If everything is under control, you are just not driving fast enough!" - Sir Stirling Moss

Fri, Apr-01-2011, 03:04:22 PM	#8
Mr.G3 Resident User Join Date: Feb 2004 Age: 37 Posts: 2,730 Reputation: 0 Location: SEFLa	Re: Proper PSI for low profile tires? i guess im the only running more psi in the fronts than the rears- 37f/35r cold for street use - i feel the more psi in the fronts helps acceleration, since the car is pushing rather than pulling (RWD)- so I take off from the inertia of the front tires __________________

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