Tire Pressure question

[texevora]

For those folks out there with the OEM 19 front/20 rear P-Zero Corsas, what tire pressures are you running front/rear and hot/cold?

Just got my 1K service done and noticed that the dealer increased my pressures from 29ish front/32ish rear cold (32/35 hot) to 35ish front/38ish rear (38/41 hot).

Wondering what everybody else is running for maximum tread life.

[KCZ]

Originally Posted by texevora

For those folks out there with the OEM 19 front/20 rear P-Zero Corsas, what tire pressures are you running front/rear and hot/cold?

Just got my 1K service done and noticed that the dealer increased my pressures from 29ish front/32ish rear cold (32/35 hot) to 35ish front/38ish rear (38/41 hot).

Wondering what everybody else is running for maximum tread life.

Your dealer probably made the adjustment because F35 and R38 are Lotus's recommended cold tire pressures for the 19/20" Corsas on the Evora S. I used those pressures when I first got my car, and it resulted in noticeable excessive wear in the centers of the tires at 2000 miles. Dropping the pressure to about F33 and R35 seemed to improve the central wear problem, although I now have excessive wear on the inside of the rears. An alignment is pending.

ETA: These are measured pressures, not from the TPMS which is largely inaccurate.

[texevora]

Interesting. How many miles do you have on your tires now?

[zffej]

What does the sticker on the drivers door say? Mine says 32.5 front, and 36 rear cold. I also have a 2011 S with 19/20 wheels.

[texevora]

When I glanced at it last night I didn't think it said anything about tire pressures, but it's very possible I overlooked it. I wonder if it would reflect the recommended tire pressures for the 19/20 Corsas specifically, since the standard wheels are the non-Corsa 18/19s?

[Allan Gibbs]

I noticed that too. My dealer keeps lowering my tire pressures to around 30/32 and I keep bring it up to 34/36.

Originally Posted by texevora

For those folks out there with the OEM 19 front/20 rear P-Zero Corsas, what tire pressures are you running front/rear and hot/cold?

Just got my 1K service done and noticed that the dealer increased my pressures from 29ish front/32ish rear cold (32/35 hot) to 35ish front/38ish rear (38/41 hot).

Wondering what everybody else is running for maximum tread life.

[KCZ]

Originally Posted by texevora

Interesting. How many miles do you have on your tires now?

My tires were pretty worn at 2000 miles because of the center wear. At 4000 miles, they needed replacement. At 5000, they're probably not safe any more. I'm waiting for spring so I can get back to the dealer's for an alignment and new tires.

Originally Posted by zffej

What does the sticker on the drivers door say? Mine says 32.5 front, and 36 rear cold. I also have a 2011 S with 19/20 wheels.

My car came without a sticker, and my driver's manual only covers the OEM tires on the Evora NA, not Corsa's on the Evora S. I had to call my dealer's service manager, and he had to call Lotus to get the information I posted above.

[vkykam]

I may be way off track, but I suspect the wear has much more to do with the alignment than the tire pressure. I ran 35/38 cold or very close to it (temperature dependent) for the majority of the summer last year, and I have 5.5k miles with at least 50% tread left, if not more. The other S I looked at at 8k miles and looking 50% tread too, which leads me to suspect either road conditions of an area mattered more, or alignment from the factory for a big batch of cars were wonky.

But I'm no expert...


Sent from AutoGuide.com Free App

[brgelise]

Lotus has that alignment history.....

[cdn_alien]

Keep in mind that the TPMS can be way off. Mine was reading low by 2 pounds (which meant I was overinflated by 2 pounds), and I went through the first set of rears before I realized it. Now I use 32F/34R actual pressures and the tread wear is much more even, with slightly more wear on the inside, due to the camber I'm sure. I have 18/19's on NA Evora.

[Sven76]

I use Lotus recommendations, fronts wear evenly, rears more in the inner side. Too much highway, not enough twisties. You could fix tire wear with alignment, but this would spoil the ride. Got 8-9000 miles out of my Corsas, fine, won't change anything.

[brgelise]

NEVER EVER Use a TPMS sensor as a pressure gauge. It is an emergency system that is a ballpark. They a re notoriously inaccurate on many makes. BMW was smart enough to not let them give a temp readout for just that reason.

[Sven76]

Good pressure gauges are not overly expensive, so that is a cheap fix.

[invictusmaneo]

bringing this to the top. I normally run about the factory specs (33 front, 36.5 rear but usually 37 to make it easy) but during hot spells out here I'll reduce pressure a bit.


I am doing an autox tomorrow and am not looking to be competitive time wise at all, just going to have fun and get a feel for this car at a higher limit then I can on backroads.

Since there is no time for the tires to warm up, and I have read it is best to run higher than recommended when doing autox, do you guys think 35/39 is good? any recommendations? looks like it'll be about 75 degrees, sunny tomorrow for us and we're only getting about 4 runs.

[GuppyCaptain]

I'm picking up my car this weekend and am going to ask the dealer to set the cold tire pressures to 33F/35R on the 19/20"s. Thoughts, comments?

[2011 chrome orange]

Originally Posted by GuppyCaptain

I'm picking up my car this weekend...

Long time coming... What's it going to be??

[LotusGreenville,SC]

Recommended pressures for 18/19 is 33.5F and 36R. The 19/20 is 35F and 38R. I personally recommend for wear purposes and ride quality the 18/19, 32F and 34R and 19/20, 33F and 35R and bump up to the recommended for more spirited driving. I have also found that the TPMS sometimes to be dead accurate and other times off by 3.5psi.

[GuppyCaptain]

Originally Posted by 2011 chrome orange

Long time coming... What's it going to be??

Hahaha. Yeah, over a year in the making and still not the color I had hoped for, but I will be very happy with what I'm getting especially at the price I'm paying. As for what it's going to be? You'll see

I'll post pix next week.

[GuppyCaptain]

Originally Posted by LotusGreenville,SC

Recommended pressures for 18/19 is 33.5F and 36R. The 19/20 is 35F and 38R. I personally recommend for wear purposes and ride quality the 18/19, 32F and 34R and 19/20, 33F and 35R and bump up to the recommended for more spirited driving. I have also found that the TPMS sometimes to be dead accurate and other times off by 3.5psi.

Thanks, that's helpful.

[brgelise]

Originally Posted by Allan Gibbs

I noticed that too. My dealer keeps lowering my tire pressures to around 30/32 and I keep bring it up to 34/36.

Your dealer is actually very smart unless their gauge is off. I've run 33/35 since new and nice even wear. I always use Lotus pressures as a guide for hot pressures and it has worked VERY well at track for me.

Its best not to let tires get above placard pressures for wear and frankly max grip. Those numbers also are for max GVWR meaning loaded with passengers and luggage.