Tire pressure
03-09-09, 01:29 PM
#16
Driver
Thread Starter
Join Date: Feb 2009
Location: SC
Posts: 142
Likes: 0
Received 0 Likes
on
0 Posts
Yup...this is one of the rare instances where GM is way ahead of Lexus :P
BTW- had my 10k service today and the dealer apparently puts all 4 tires at 36 psi when they check/top em off on my 350 at least.
(and I still had 9/32nds of tread according to them at just under 10k miles, which suggests my factory tires will last a fairly insane amount of miles)
BTW- had my 10k service today and the dealer apparently puts all 4 tires at 36 psi when they check/top em off on my 350 at least.
(and I still had 9/32nds of tread according to them at just under 10k miles, which suggests my factory tires will last a fairly insane amount of miles)
03-10-09, 06:07 AM
#18
Driver
Thread Starter
Join Date: Feb 2009
Location: SC
Posts: 142
Likes: 0
Received 0 Likes
on
0 Posts
03-10-09, 10:03 AM
#20
That was my initial thought too. My cheapo GM rental car told me which tire was low. 
03-10-09, 02:56 PM
#21
Driver
Thread Starter
Join Date: Feb 2009
Location: SC
Posts: 142
Likes: 0
Received 0 Likes
on
0 Posts
You must have never ridden a bicycle. Ride the bike with a high tire pressure and ride it with low tire pressure.
- If tire pressure is too high, the tire contact patch is reduced, which decreases rolling resistance.
If tire pressure is too low, the tire contact patch is increased, increasing rolling resistance, tire flexing and friction between the road and tire. -
http://en.wikipedia.org/wiki/Tire
Same applies for the cars. What was the need to say "How on earth"?? what the hell?....
Also, I'm not gonna have to mention improved steering response and more responsive ride since other members here already stated.
.
- If tire pressure is too high, the tire contact patch is reduced, which decreases rolling resistance.
If tire pressure is too low, the tire contact patch is increased, increasing rolling resistance, tire flexing and friction between the road and tire. -
http://en.wikipedia.org/wiki/Tire
Same applies for the cars. What was the need to say "How on earth"?? what the hell?....
Also, I'm not gonna have to mention improved steering response and more responsive ride since other members here already stated.
.
03-10-09, 04:01 PM
#22
My TPMS warning lights (all three indicators: the yellow tire light, the red exclamation point, and the green text in the Display) come on if I'm much less than the recommended 38R/35F. How do you get away with lower pressures without being blinded by the lights?
03-10-09, 04:31 PM
#23
Rookie
Join Date: Mar 2009
Location: Atlanta, GA
Posts: 87
Likes: 0
Received 0 Likes
on
0 Posts
You basically have to do a reset on the system to the new pressures you want your new baseline to be. There is a procedure listed for it in your owners manual.
03-11-09, 09:51 AM
#24
Lexus Fanatic
iTrader: (10)
Join Date: Nov 2004
Location: Under an IS F since 2008
Posts: 13,441
Received 1,064 Likes
on
586 Posts
Just a few quick 'con' notes:
1) More prone to blowing out during impact, since there is no room for tire expansion inward.
2) More prone to uneven tire wear, especially in the center threads
3) More prone for very bad traction on wet pavements
4) In Summer heat 40psi cool air can easily turn to 50psi on a very hot day on a long drive...
But hey, if it feels better to you than so be it...
Joe Z
Last edited by lobuxracer; 03-11-09 at 05:17 PM.
03-11-09, 05:25 PM
#25
Tech Info Resource
iTrader: (2)
All - Discussion is fine, but throwing barbs and responding with equally sharp replies is not. If it continues this thread will be closed.
Note to all - if someone says something offensive to you DO NOT REPLY WHEN ANGRY. Wait and cool off, or use the Report a post feature and have a moderator review the post you find offensive.
Note to all - if someone says something offensive to you DO NOT REPLY WHEN ANGRY. Wait and cool off, or use the Report a post feature and have a moderator review the post you find offensive.
03-11-09, 05:38 PM
#26
Driver
Thread Starter
Join Date: Feb 2009
Location: SC
Posts: 142
Likes: 0
Received 0 Likes
on
0 Posts
All - Discussion is fine, but throwing barbs and responding with equally sharp replies is not. If it continues this thread will be closed.
Note to all - if someone says something offensive to you DO NOT REPLY WHEN ANGRY. Wait and cool off, or use the Report a post feature and have a moderator review the post you find offensive.
Note to all - if someone says something offensive to you DO NOT REPLY WHEN ANGRY. Wait and cool off, or use the Report a post feature and have a moderator review the post you find offensive.
03-12-09, 04:19 AM
#28
Pole Position
I agree with Joe Z. 40 is too high. Yes, lower rolling resistance. Yes, sharper steering response. But, overall, lower ultimate grip, and premature tire wear.
03-12-09, 06:31 AM
#29
Driver
Thread Starter
Join Date: Feb 2009
Location: SC
Posts: 142
Likes: 0
Received 0 Likes
on
0 Posts
I have found that 40-42 psi cold usually gives me the added steering lightness and response I'm looking for without pushing the limits of the tire due to overinflation.
Last edited by dz302; 03-12-09 at 06:32 AM. Reason: typo
03-12-09, 01:27 PM
#30
Lexus Fanatic
iTrader: (10)
Join Date: Nov 2004
Location: Under an IS F since 2008
Posts: 13,441
Received 1,064 Likes
on
586 Posts
All - Discussion is fine, but throwing barbs and responding with equally sharp replies is not. If it continues this thread will be closed.
Note to all - if someone says something offensive to you DO NOT REPLY WHEN ANGRY. Wait and cool off, or use the Report a post feature and have a moderator review the post you find offensive.
Note to all - if someone says something offensive to you DO NOT REPLY WHEN ANGRY. Wait and cool off, or use the Report a post feature and have a moderator review the post you find offensive.
No time for spell check while quick posting @ work.. LMAO…
