ClubLexus - Lexus Forum Discussion

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-   IS - 2nd Gen (2006-2013) (https://www.clublexus.com/forums/is-2nd-gen-2006-2013-163/)
-   -   Proper Tire pressure makes a difference (https://www.clublexus.com/forums/is-2nd-gen-2006-2013/960001-proper-tire-pressure-makes-a-difference.html)

nosurprise 01-19-21 09:06 AM


Originally Posted by 2013FSport (Post 10975989)
Thats also what I'm saying, driver use and style matter. The moment one inadvertently spins up an overinflated tire, boom - center is gone. Is it fair to say that rarely if ever happens to your vehicle?


Originally Posted by AMIRZA786 (Post 10975999)
Well at least we know who the people are that are doing burnouts :)

lol yeah, the only problem I have with my car at 35/38 psi is that the front tire inner wear.

AMIRZA786 01-19-21 12:31 PM

Set fronts to 38 and rears to 37

AMIRZA786 01-20-21 10:04 AM

Now that I set the fronts to 38 psi she drives a lot better. Slightly stiffer (you feel more road), but better

ncatona 01-20-21 10:58 AM


Originally Posted by AMIRZA786 (Post 10976730)
Now that I set the fronts to 38 psi she drives a lot better. Slightly stiffer (you feel more road), but better

same here for the fronts!!

2013FSport 01-20-21 12:35 PM


Originally Posted by AMIRZA786 (Post 10976730)
Now that I set the fronts to 38 psi she drives a lot better. Slightly stiffer (you feel more road), but better


Originally Posted by ncatona (Post 10976771)
same here for the fronts!!

If the edges are compromised now, go for 40 PSI to mitigate those edges being further compromised.

That said, wet weather braking/corner grip and at some level dry weather corner grip may be reduced. Of course road nose will climb as the tires reach the wear bars, but that seems true of most all performance tires anyways.

PS - with the BFG's, a low of 33 in the rear is the cutoff. Under that and she's too squirrely! 35 is pretty reasonable compromise for wear and drving...

2013FSport 01-20-21 12:40 PM


Originally Posted by nosurprise (Post 10976014)
lol yeah, the only problem I have with my car at 35/38 psi is that the front tire inner wear.

You have the RC-F LCAB's? If not, get them. It will pay for the next set of tires.
Start with a zero toe and monitor. If still scrubbing, bump the pressure to 40 psi and/or toe it in slightly. Doing both should stop wear or help it substantially.

AMIRZA786 01-20-21 02:14 PM


Originally Posted by 2013FSport (Post 10976859)
You have the RC-F LCAB's? If not, get them

I second that

redspencer 01-20-21 04:43 PM

I always inflate my front and rear tires to 38 psi as it improves responsiveness from the tires. Once they drop below 36 psi, I'll reinflate them back to 38 psi.

nosurprise 01-21-21 03:33 PM

I did 38/38 for a while, then I decided to do 37/38 because I think Lexus must have a reason to spec the front with lower PSI lol

Originally Posted by 2013FSport (Post 10976859)
You have the RC-F LCAB's? If not, get them. It will pay for the next set of tires.
Start with a zero toe and monitor. If still scrubbing, bump the pressure to 40 psi and/or toe it in slightly. Doing both should stop wear or help it substantially.

Upping the front PSI seems to have fix the inner wear issue without any additional changes for me.

redspencer 01-21-21 04:56 PM


Originally Posted by nosurprise (Post 10977697)
I did 38/38 for a while, then I decided to do 37/38 because I think Lexus must have a reason to spec the front with lower PSI lol

A lower PSI up front promotes understeer which is considered to be a safer setup for the majority of drivers.

2013FSport 01-21-21 07:40 PM


Originally Posted by redspencer (Post 10977752)
A lower PSI up front promotes understeer which is considered to be a safer setup for the majority of drivers.


I think that mostly applies to the FWD econobox with positive camber up front and negative camber/nothing in the rear. For them, plowing into a corner unable to turn keeps them safe as they are forced to let off the throttle, especially with the variance in camber front to rear, it ensures the front stays in the lead...

Not exactly true of our cars!

Raise your hand if you've backed yours into a corner!!! Haha! I haven't this one, but with nannies off, crossed it a good 55° out of a corner taking two opposing corrections to drive it straight. in my defense crappy Nitto tires out back.

JayGee359 01-22-21 08:44 AM

Just inflated 38 up front from 33
Rears up 38 from 36

I like the way the steering wheel feels now. I’m really hoping to get 60k out of this set of tires this time around.

This thread along with this forum and everybody contributing has helped me a lot trying to fine tune the Lexi. 🤜🏽🤛🏽

AMIRZA786 01-22-21 09:57 AM

Glad this thread was helpful. BTW, RWD IS350, don't drive on wet or icy roads with the nannies turned off! It was raining this morning, I was a bit nostalgic about the days when TC didn't exist, so I turned off said technology. Even with super grippy Michelin Pilots the rear didn't want to behave just going a bit down on the pedal, especially in turns. Reminded me of my fathers 79 Buick LeSabre with it's 350, which I spun plenty of times in my more youthful days! Nannies back on, all was well again. I have to stop remisensing my younger stupider years...

AMIRZA786 01-24-21 09:24 PM

I noticed that my front tires on my 2013 Toyota Sienna are showing excessive wear on the outer edges of the front tires. Maybe needs an alignment, or maybe I should put RCF LCA bushings on them LOL! 142k it probably needs new bushings anyway. The RCF bushings was a joke BTW...

ncatona 01-25-21 11:40 AM


Originally Posted by redspencer (Post 10977031)
I always inflate my front and rear tires to 38 psi as it improves responsiveness from the tires. Once they drop below 36 psi, I'll reinflate them back to 38 psi.

How has your wear been using this psi? I just raised it for my fronts but my rears are at 35 to mitigate inner tire wear there.


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