IXLRS

I’m curious what others with the IS350 sport have there tire pressure set at.

I checked my tires today and found that all four were at 45psi (too high).

FWIW, the owners manual say’s 35 for the front and 38 for the back.

I was really surprised how much the ride smoothed out when I set mine at 37 front 40 in the back today. Night & day difference. I’m still experimenting.

I think I’ll try 40 in the front and 43 in the back next and see which set up I like best.

Tire pressure makes a huge difference in ride characteristics of the 350 with 18,s. Check yours out!

jcreech

i got mine at 37 front 40 back

Leechiro

i was running on 50 all around...for some reason when i saw 50psi max on the tire, i figured i needed it at 50. now its about 40 around the car. maybe still too much. but i wonder how much going to 35-38 will change in gas mileage versus the 50 i was at.

rominl

iTrader: (4)

that's max pressure, but there is no resaon why you have to put so much pressure. i say around 37psi is good

4TehNguyen

iTrader: (1)

40 psi is a lot, what does the manual say, that 40 psi will easily rise to 45+ when the tires warm up, making your contact patch smaller

Bichon

Seeing as someone made the mistake of confusing max pressure with recommended pressure, I thought I'd mention another common newbie mistake. Always check your tire pressure when the tires are cold, e.g., driven less than a mile. If you do it when they are warm, you'll end up with too little air in the tire. The logistics of this were difficult when I was getting my air at the filling station, but now that you can buy tire inflators for $20 at WalMart, it's easy to check them first thing in the morning before the car has even been started.

IXLRS

Which in theory give you better gas milage?

4TehNguyen

iTrader: (1)

doubt it has a noticable effect on gas mileage, 50 psi will make the ride stiffer, losing contact patch and wearing the tires unevenly with overinflation. Theres usually a sticker to show you what pressures the front and rear should be in the drivers door area. All recommended pressures for tires are always assumed to be cold temperatures, the psi will easily rise 5-7 psi during driving because the tires heat up

rominl

iTrader: (4)

correct, good point. and for me, if i have to drive to gas station which is far away, what i do is just add another couple of psi TRYING to offset the difference. i have 20s, so instead of 40psi, at gas station i might do 43 or 44 depends on how how warm the tires are. not the most precise way, but best i could do

well, comparing to say 20psi, yes, probably. but comparing with a optimally inflated tire? i dont' think practically you will see any difference

GreyHound

iTrader: (1)

Dude , just look inside the driver door post , where the latch is. Its 35 front and 38 rear. I seem to remember. Its listed by the size of your tire. They have been putting it there for years

Olrocker

Just looked. It's 35/37.

Leechiro

yah, the theory is that the higher the psi, the better the gas mileage, but its prob true that the diff from 35/37 to 45/50 wont even be noticable. but to some, little is better than nothing these days.