Do you guys follow the Lexus-recommended 30psi for your tires?
#2
No, because Lexus does not make tires and never will be able to test each model (past and present) with every single tire offers by all tire makers. 30 psi is just a rule of thumb.
#3
Moderator
Nothing magical about the pressure ..
Compromise among road-grip, ride comfort, fuel-economy.
Sweet spot for me is around 32psi.
Salim
Compromise among road-grip, ride comfort, fuel-economy.
Sweet spot for me is around 32psi.
Salim
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#8
Moderator
#9
Super Moderator
#10
#11
Super Moderator
Let me relate something from my racing experience, actually the first time I took my RX over to the track down here.
First time I ran it was a 19.6 or so, stock.
One of the minor adjustments I made after that as adjusting the tire pressure from about 33 or so up to about 37.
Now, I did do a coupe of other things like ditching the air filter, wrapping duct tape around the middle of the airbox (where hot air might sneak in), lowering how much I put in the trank from about 1/4 to 1/8 a tank, ditching the spare tire, jack and turning off the headlights.
Next time I ran, down to 19.2.
I did further testing and tried it higher like at about 42 or so.
Now, the tires jumped when hot to about 43 psi, but the RX could not get good traction and I could feel it seems to slide or skip as I went down the track, and lost about a .1 of a second or so.
Now, about this time of the year, I find 39 psi just fine (cooler), whereas maybe a 38 in hotter weather, (would go up to 39 psi when hot), would be just fine.
#12
Lexus Champion
I think that the ideal tire pressure depends on the tires and your personal taste. After some trial-and-error, I did 33/31 (front/back) with Goodyear Integrity, then 32/30 with Bridgestone Dueler D687.
Now I'm experimenting tire pressure with my new Goodyear Fortera Tripletred. The sweet spot seems to be 31/29 for now. My gas mileage improved from 22.8 to 24.3. The ride quality improved, too.
Agree that 30/30 makes the front tires look flat. And it makes no sense since the RX300 is front heavy (57/43).
Now I'm experimenting tire pressure with my new Goodyear Fortera Tripletred. The sweet spot seems to be 31/29 for now. My gas mileage improved from 22.8 to 24.3. The ride quality improved, too.
Agree that 30/30 makes the front tires look flat. And it makes no sense since the RX300 is front heavy (57/43).
#13
#14
Lead Lap
the tire pressure is specified by the car manufacturer due to ride quality and engineering characteristics developed with the suspension.
Presuming you are using the right spec tire for the car, always use the tire pressure indicated on the inside of the driver's side door.
Some car manufacturers even go as far as having multiple tire pressure levels suggested due to different load capacities the vehicle might have, ie:
when carrying 4 passengers or 2..
My old Pathfinder had a 26 psi requirement which I couldn't figure out until a suspension specialist said to use the specified psi due to handling characteristics designed into the stock suspension.
Its 30psi for me all year round with the RX
Last edited by Fern; 11-09-06 at 06:14 PM.