Tire Pressure which one...

Nismoracer · 04-11-2011, 03:59 PM

Which pressure ratings do you go by? What's written on the side of the tire or what's written on the vehile's door jam? Do you inflate to max pressure like you do on bikes or trailers if not why not? Max psi rate on my truck tires are 65psi. I infate to 50. Anything lower and tire looks flat. Best determined for grip and efficiency. When going on a long highway trip I inflate to max psi or when carrying a load. Should tires be inflated to max cold psi?

kenchan · 04-11-2011, 04:04 PM

35psi cold if you're using stock setup. it's on the driver side door jam.

i like a firmer ride so use 37psi usually.

kenchan · 04-11-2011, 04:05 PM

btw, that's measured when the tires are cold in the morning or after being in my garage over 5hrs.

dad · 04-11-2011, 04:11 PM

Read and learn (sarcasm not intended)

Tire Tech Information - Air Pressure - Correct, Underinflated and Overinflated

ChrisSlicks · 04-11-2011, 05:36 PM

Quote:

Originally Posted by dad

Read and learn (sarcasm not intended)

Tire Tech Information - Air Pressure - Correct, Underinflated and Overinflated

The number on the door jam is what you want to go with as the cold pressure (that is 35 psi as already mentioned).

From experimentation at auto-x I've found the ideal hot pressure is around 38 psi front, 35 rear. The rears don't heat up as much as the fronts do, even when you try.

ChrisSlicks · 04-11-2011, 05:40 PM

This is also useful for explaining how pressure requirements and load ratings change with vehicle speed as well.

Tire Tech Information - Air Pressure/Load Adjustment for High Speed Driving

Red__Zed · 04-11-2011, 05:48 PM

Quote:

Originally Posted by ChrisSlicks

This is also useful for explaining how pressure requirements and load ratings change with vehicle speed as well.

Tire Tech Information - Air Pressure/Load Adjustment for High Speed Driving

good info.

Quote:

Originally Posted by ChrisSlicks

The number on the door jam is what you want to go with as the cold pressure (that is 35 psi as already mentioned).

From experimentation at auto-x I've found the ideal hot pressure is around 38 psi front, 35 rear. The rears don't heat up as much as the fronts do, even when you try.

We have our crappy weight distribution to thank for that.

Nismoracer · 04-11-2011, 06:50 PM

Read it, and it says you need more psi the faster you go. So using the max psi# on the side of the tire is ok. I wondered why the recomendations on cars is always lower than max psi on the sidewall. On bikes they tell you to inflate to max psi on the sidewall.

Nismoracer · 04-11-2011, 06:54 PM

Got it.

cossie1600 · 04-11-2011, 08:48 PM

sounds like the prius forum, those guys always try to inflate tires to 55psi to get the maximum gas mileage

6MT · 04-11-2011, 09:57 PM

Quote:

Originally Posted by cossie1600

sounds like the prius forum, those guys always try to inflate tires to 55psi to get the maximum gas mileage

I don't think so. People have genuine questions. This is a forum..... sometimes people are looking for answers.

Trips · 04-11-2011, 10:14 PM

Quote:

Originally Posted by 6MT

I don't think so. People have genuine questions. This is a forum..... sometimes people are looking for answers.

Sometimes guys also switch tires out and wonder whats the normal tire pressure?
This isn't like asking whats the best oil? Lol

spearfish25 · 04-11-2011, 10:36 PM

Please don't inflate your tires to 60psi though.

Red__Zed · 04-11-2011, 10:42 PM

Quote:

Originally Posted by spearfish25

Please don't inflate your tires to 60psi though.

But if you do, post videos.

kenchan · 04-11-2011, 10:51 PM

Quote:

Originally Posted by spearfish25

Please don't inflate your tires to 60psi though.

hahaha, i inflate my donut to 60psi.

04-11-2011, 03:59 PM	#1 (permalink)
Nismoracer Enthusiast Member Join Date: Nov 2010 Location: Earth Posts: 420 Drives: 10 Nismo Rep Power: 15	Tire Pressure which one... Which pressure ratings do you go by? What's written on the side of the tire or what's written on the vehile's door jam? Do you inflate to max pressure like you do on bikes or trailers if not why not? Max psi rate on my truck tires are 65psi. I infate to 50. Anything lower and tire looks flat. Best determined for grip and efficiency. When going on a long highway trip I inflate to max psi or when carrying a load. Should tires be inflated to max cold psi?

04-11-2011, 04:11 PM	#4 (permalink)
dad Grand Prix of Endurance Join Date: Nov 2008 Location: Tennessee Posts: 3,476 Drives: Mulsanne Straight Rep Power: 26	Read and learn (sarcasm not intended) Tire Tech Information - Air Pressure - Correct, Underinflated and Overinflated __________________ We can do without any article of luxury we have never had; but once obtained, it is not in human nature to surrender it voluntary.

04-11-2011, 05:40 PM	#6 (permalink)
ChrisSlicks A True Z Fanatic Join Date: Mar 2009 Location: North East Posts: 6,203 Drives: 09 370Z Sport M6 Rep Power: 653	This is also useful for explaining how pressure requirements and load ratings change with vehicle speed as well. Tire Tech Information - Air Pressure/Load Adjustment for High Speed Driving __________________ Hotchkis ARB \| Stillen CAI \| Art Pipes \| Berk CBE \| Stillen AP Racing Brakes \| AE Performance Oil Cooler \| BC Racing ER Coilovers \| Doran Control Arms

04-11-2011, 10:36 PM	#13 (permalink)
spearfish25 A True Z Fanatic Join Date: Mar 2009 Location: Naples, FL Posts: 4,117 Drives: to work Rep Power: 1856	Please don't inflate your tires to 60psi though. __________________ 2013 Cadillac V-Wagon, RIP Z

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04-11-2011, 04:04 PM	#2 (permalink)
kenchan A True Z Fanatic Join Date: Aug 2009 Location: N/A Posts: 76,801 Drives: N/A Rep Power: 141521	35psi cold if you're using stock setup. it's on the driver side door jam. i like a firmer ride so use 37psi usually.

04-11-2011, 04:05 PM	#3 (permalink)
kenchan A True Z Fanatic Join Date: Aug 2009 Location: N/A Posts: 76,801 Drives: N/A Rep Power: 141521	btw, that's measured when the tires are cold in the morning or after being in my garage over 5hrs.

04-11-2011, 06:50 PM	#8 (permalink)
Nismoracer Enthusiast Member Join Date: Nov 2010 Location: Earth Posts: 420 Drives: 10 Nismo Rep Power: 15	Read it, and it says you need more psi the faster you go. So using the max psi# on the side of the tire is ok. I wondered why the recomendations on cars is always lower than max psi on the sidewall. On bikes they tell you to inflate to max psi on the sidewall.

04-11-2011, 06:54 PM	#9 (permalink)
Nismoracer Enthusiast Member Join Date: Nov 2010 Location: Earth Posts: 420 Drives: 10 Nismo Rep Power: 15	Got it.

04-11-2011, 08:48 PM	#10 (permalink)
cossie1600 A True Z Fanatic Join Date: Jun 2009 Location: californee way Posts: 5,380 Drives: 370, Leaf Rep Power: 30	sounds like the prius forum, those guys always try to inflate tires to 55psi to get the maximum gas mileage