Is 40 lbs of air good for suspension ?

emjei · 02-29-2008, 07:49 PM

as question

VMRWheels · 02-29-2008, 07:54 PM

I'm guess you're talking about tire pressure? 40psi is somewhat high for cold pressure readings. That's a bit high and not recommended. If this is your tire pressure when your tire is hot, 40psi sounds about right.

Alias · 02-29-2008, 07:58 PM

Are you running 18" or 19"

E90330iS · 03-01-2008, 05:47 AM

The recommended tire pressure for 18" is 38 rear.. I thought that was pretty high.

CokerRat · 03-01-2008, 11:01 AM

The suspension isn't affected by overinflating the tires. However by doing so you are decreasing the size of the contact patch, therefore reducing traction and causing uneven wear across the tires. On the plus side you would reduce rolling friction --> improves fuel economy.

I follow BMW's specification for tire pressure.

Nikolas · 03-01-2008, 11:10 AM

Unless you are tracking the car there is no need to change it from factory specs.

ubern00b · 03-01-2008, 11:14 AM

Quote:

Originally Posted by E90330iS

The recommended tire pressure for 18" is 38 rear.. I thought that was pretty high.

what is recommended in the front for 18"?

montreal_bimmer · 03-01-2008, 12:33 PM

i say go with 35 all around... 40 seems to be pretty high

02-29-2008, 07:49 PM	#1
emjei Captain 80 Rep 821 Posts Drives: 08 BMW M3 Coupe Join Date: Apr 2007 Location: Puerto Rico USA iTrader: (3)	Is 40 lbs of air good for suspension ? as question
	Appreciate 0 Tweet Quote

02-29-2008, 07:54 PM	#2
VMRWheels BimmerPost Supporting Vendor 2080 Rep 25,980 Posts Drives: BMW Join Date: Jun 2007 Location: Anaheim, CA iTrader: (4) Garage List 2013 BMW M3 [10.00] 2015 BMW M4 [0.00] 2013 BMW F30 [0.00] 2014 BMW F22 [0.00] 2013 BMW F06 [0.00]	I'm guess you're talking about tire pressure? 40psi is somewhat high for cold pressure readings. That's a bit high and not recommended. If this is your tire pressure when your tire is hot, 40psi sounds about right. __________________ VMR\|Wheels \| 714.442.7916 \| sales@velocitymotoring.com \| www.velocitymotoring.com \| facebook \| flickr \| Instagram
	Appreciate 0 Quote

02-29-2008, 07:58 PM	#3
Alias dork 38 Rep 477 Posts Drives: //M Join Date: Jul 2007 Location: so cal iTrader: (3)	Are you running 18" or 19"
	Appreciate 0 Quote

03-01-2008, 05:47 AM	#4
E90330iS Major General 148 Rep 6,333 Posts Drives: BMW M4 Join Date: Jan 2006 Location: Arcadia, California iTrader: (56) Garage List 2006 330i [0.00]	The recommended tire pressure for 18" is 38 rear.. I thought that was pretty high. __________________ 2017 BMW M4 DCT Lease Transfer: https://f80.bimmerpost.com/forums/sh...8#post23736398
	Appreciate 0 Quote

03-01-2008, 11:01 AM	#5
CokerRat Private 3 Rep 97 Posts Drives: 2015 F10 535i xDrive Join Date: Dec 2006 Location: Canada iTrader: (0)	The suspension isn't affected by overinflating the tires. However by doing so you are decreasing the size of the contact patch, therefore reducing traction and causing uneven wear across the tires. On the plus side you would reduce rolling friction --> improves fuel economy. I follow BMW's specification for tire pressure.
	Appreciate 0 Quote

03-01-2008, 11:10 AM	#6
Nikolas Colonel 313 Rep 2,576 Posts Drives: 996 TT Join Date: Jul 2007 Location: Sierra Mountains iTrader: (0)	Unless you are tracking the car there is no need to change it from factory specs.
	Appreciate 0 Quote

03-01-2008, 12:33 PM	#8
montreal_bimmer OEMconcept 179 Rep 5,593 Posts Drives: BMW Join Date: Feb 2006 Location: Canada \| USA iTrader: (6) Garage List 2006 325i [10.00]	i say go with 35 all around... 40 seems to be pretty high
	Appreciate 0 Quote