Stupid question (re tire pressure) but I couldn't find an answer doing a search....

trick50 · 09-16-2007, 10:10 PM

Before anyone tells me to

or to check my owners manual...I already did a search and could not come up with anything relevant. And I am moving soon and packed my owners manual because it doesn't fit in the damn glove box.

Today I got a "low tire pressure" indication on my idrive so I pulled into my garage checked the pressure and it was around 19PSI...I looked at the tire and it says max 40 PSI which seems kinda high to me. I checked all of my other tires and they were all around 28PSI.

I added air to all of the tires and brought the pressure to 35PSI. The ride felt much better and actually smoother and tighter. But while launching I noticed alot more wheelspin which I expected.

My questions are as follows...
To achieve optimal fuel economy, ride quality and comfort. What is the manufacturers recomended tire pressure?

To achieve optimal performance as far as launching and handling what is optimal for both front and back?

**My car is sitting on stock 18" RFT's**

07 E92 335i.
Sport
Step w/paddles
Navi
Blu Tooth
Cold Weather
Space Gray w/Blackette and Gray Poplar
14000 Miles

Current Mods: (hardly mods just little things)
Black Kidneys
Black Lower Mesh
Complete Carbon Roundels
Rear Fogs
35% Tint
debadged
Golf Tee
K&N Drop In
Removed Air Bag Warning Labels.

CALIF65GM · 09-16-2007, 10:13 PM

Recommended tire pressures is printed on the label that's about half down on the pilar behind the driver's door.

mesier1111 · 09-16-2007, 10:28 PM

Quote:

Originally Posted by CALIF65GM

Recommended tire pressures is printed on the label that's about half down on the pilar behind the driver's door.

I think he was looking for more complex of a response that I unfortunately do not know. All I know is what it says on the door. I leave mine around 2-3lbs lower than the recommended levels that are printed on the dollar and I still avg 24.2 mpg and that is with being nice to her sometimes and other times driving her like I stole her

Orient330iNYC · 09-16-2007, 10:30 PM

19psi in one with 28 on the others says to me nail in tire-- did you check to see if there was a puncture.

40psi max is the max for seating the beads when mounting the tire-- the max cold pressure for potenzas is 51psi.

right now i'm running 36 all around... i might increase it to 38 as i just got my first sidewall bubble. stupid NYC potholes.

spacedogg · 09-16-2007, 10:30 PM

I'm currently playing with 37 PSI front and 36 PSI in the rear on my 19" tires. The higher front PSI is to counter the understeer. I think it does a good job.

On 18" tires...try 35 PSI front and 34 PSI in the rear. Adjust accordingly.

09-16-2007, 10:10 PM	#1
trick50 Major 56 Rep 1,047 Posts Drives: E92 335i Space Gray Join Date: Aug 2006 Location: Douglaston, New York iTrader: (1)	Stupid question (re tire pressure) but I couldn't find an answer doing a search.... Before anyone tells me to or to check my owners manual...I already did a search and could not come up with anything relevant. And I am moving soon and packed my owners manual because it doesn't fit in the damn glove box. Today I got a "low tire pressure" indication on my idrive so I pulled into my garage checked the pressure and it was around 19PSI...I looked at the tire and it says max 40 PSI which seems kinda high to me. I checked all of my other tires and they were all around 28PSI. I added air to all of the tires and brought the pressure to 35PSI. The ride felt much better and actually smoother and tighter. But while launching I noticed alot more wheelspin which I expected. My questions are as follows... To achieve optimal fuel economy, ride quality and comfort. What is the manufacturers recomended tire pressure? To achieve optimal performance as far as launching and handling what is optimal for both front and back? My car is sitting on stock 18" RFT's 07 E92 335i. Sport Step w/paddles Navi Blu Tooth Cold Weather Space Gray w/Blackette and Gray Poplar 14000 Miles Current Mods: (hardly mods just little things) Black Kidneys Black Lower Mesh Complete Carbon Roundels Rear Fogs 35% Tint debadged Golf Tee K&N Drop In Removed Air Bag Warning Labels. __________________ "If you're not intense..you're past tense" "..Greed is good, greed works.." 07 E92 335i,Sport,I-drive,Cold Weather,Bluetooth,Beyern Mesh 19",M-Pedals,Rear Fogs,Gp Thunder,Carbon Roundels,Coming Soon JB2,Vorsteiner Decklid,OEM Aero LipRIP9/8/06-12/11/07 Gone but never forgotten
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09-16-2007, 10:13 PM	#2
CALIF65GM Colonel 97 Rep 2,041 Posts Drives: e93-35 May08 ED Join Date: Jun 2005 Location: SF, CA iTrader: (0) Garage List 06 - Oct. 05 build ... [0.00]	Recommended tire pressures is printed on the label that's about half down on the pilar behind the driver's door. __________________ 5-2-08 e93-35 ED Montego w/Jade Grey, Step w/Paddles, PP, SP, CA, hot seats and iPod.Awaing re-delivery soon. Debadged 330xi ED 11/14/05 Auto/Mystic Blue/Gray leather with Alum/PP/SP/CA/Fold-down rear seats/Alarm. Sold to Carmax on 6/7/08 with 50,624 miles on clock
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09-16-2007, 10:30 PM	#4
Orient330iNYC Brigadier General 1469 Rep 3,552 Posts Drives: 2023 X7 40i Join Date: Apr 2007 Location: Wall St iTrader: (2)	19psi in one with 28 on the others says to me nail in tire-- did you check to see if there was a puncture. 40psi max is the max for seating the beads when mounting the tire-- the max cold pressure for potenzas is 51psi. right now i'm running 36 all around... i might increase it to 38 as i just got my first sidewall bubble. stupid NYC potholes. __________________ Present: 2023 G07 40i ZDH/ZDU/ZMP/ZMQ/2NH/ZPK/ZPP/ZRC/300/3AC Past: 2013 335i 6MT ZMM/ZDH/ZTP/3AG/494/508 Past: 2016 F34 335i xDrive ZCW/ZDA/ZDH/ZTP/ZMP/2V5/5DL Past: 2019 G01 M40i ZDA/2VF/ZPP/ZPX/688/3AC
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09-16-2007, 10:30 PM	#5
spacedogg Colonel 194 Rep 2,816 Posts Drives: Debadged Join Date: Aug 2006 Location: Vancouver, BC iTrader: (0)	I'm currently playing with 37 PSI front and 36 PSI in the rear on my 19" tires. The higher front PSI is to counter the understeer. I think it does a good job. On 18" tires...try 35 PSI front and 34 PSI in the rear. Adjust accordingly.
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