kqt2ktval

I did a search, but could not find any related posts for the 2IS. The sticker by the door saids front should be 35 and rear should be 37. I am running the stock tires. Would it be better if both tire pressure be the same. This is the first time I'm running a stagger setup. What tire pressure do you use on your car? I'm not getting good mileage ( main reason, still in break in period, also live in CA, winter gas) but I don't want tire pressure to be another factor for my low mileage 20-22mpg; driving normal, no heavy foot . 70% highway (70-75mph) , 30% city; .. I'm puzzle because the front tires is so much thinner than the one in the rear (not referring to width of tire). Also, these are 18 inches.

Bichon

I adhere to the pressures recommended on the door jamb sticker.

cmusic

I was running 35/37 on my Dunlops when the passengerside rear sidewall blew out on 12/16/06. I only had 9700 miles on them. I was going 60 mph on a straight road when my low tire pressure warning light came on. I stopped at a nearby friends house and we found a 3/16" hole in the sidewall near where the sidewall would meet the tread layers on the inside of the tire. As as live 130 miles from my nearest Lexus dealer, my dealer recommended going to my local Dunlop dealer for replacement. My Dunlop dealer said it looked like someone with a screwdriver stabbed my tire, rejecting my explaination that I was (and had been driving for several miles) traveling at 60 mph when the flat occured. It was his word against mine and he was not going to warranty the tire. And to add insult to injury he said it would take 7-14 days to get a replacement (from Tirerack no less).

I went to another tire dealer that did not sell Dunlops. He called Tirerack and said he would have an exact Dunlop replacement in two days. When I had the new tire installed they took care on getting the pressure sensor re-installed correctly and all the lugnuts torqued correctly. The installer said they run all low profile tires at 40-45 psi due sidewall blowouts. He said my tire blowout looked to be from low air-pressure, which places extra stress on the sidewall. I will be going back to them when I get my next set of tires.

Flipsonic

When I had the stock wheels (18") on, I had it at 35/37. Now that I have aftermarket wheels (19"), I'm running it at 40 psi all around.

IS_Mine

This is a dumb question.

But.. if your tire pressure is higher than what is specified.. lets say from 35/37 to 40 all around on OEM.. and you hit a big pot hole are you more likely to pop a tire?

I guess my question should be.. what happens to a tire when you put too much air into it.

cdeslandes

I used to set the pressure a little higher than recommended (say, 2 or 3 PSI) but I noticed that this tends to aggravate the understeer. These days I run the recommended pressure and the car handles just fine.

Higher pressure is really recommended for high speed or track driving. A lower pressure (but not too low) will make the tires more compliant to road imperfections, and improve traction.

Gtidan

35 psi front and back.........

hapaboy

35psi. too lazy to look at the door jam. already bent a rim (stock) while going 65mph. tire did not blow out, which is good considering that i hit a rubber 2x4. i have the bridgestones.

clubfoot

Stock pressures front and rear 35 & 37, using nitrogen. If I drove on bad roads, I'd bump it up a couple psi maintaining the same differential. Some Lexus engineer spent allot of time coming up with those pressures, give him some credit.

Magellan

I agree. I don’t really know why the question was asked in the first place. Those engineers go to a lot of trouble to recommend proper settings, not only for tire pressures but for fuel octane, torque settings, oil viscosity and the whole range of operating parameters. They’ve done this to give us the best driving experience and longest car life they can muster. We better have a real good reason to ignore their recommendations.

lobuxracer

iTrader: (2)

I always start with stock and adjust to suit my driving style. I typically end up a couple of psi over the stock number, but this car has been pretty good right on the recommended pressures. I'm just glad I have a compressor in my garage so I can get cold pressure accurately without any guesswork.

Gernby

iTrader: (1)

To emphasize lobuxracer's comment about accurate pressure settings ... I always set my tire pressures after the car has been in my garage over night. Sun light will make significant enough of a differential in tire pressures to cause the car to pull and / or handle poorly if you adjust according to the measurements.

lexusMnl

32 f 34 rear

Sango

iTrader: (10)

The lower pressure is more geared for performance which Lexus puts on the door jam.

As per what the tire tech put on my car.

40 psi front, 38 psi rear.