Best Tire Pressure

[ITR_TYPE_R]

I put a new wheels and new tires in my car and I want to now the best pressure for the tires??

Brigestone RE 050
Front: 215-40 R 17
Rear: 275-35 R 18

Thanks

 

[nsxtasy]

I would start with the pressure at the Honda recommendations of 33 psi (pounds per square inch; 33 psi = 2.28 bar) front and 40 psi (2.76 bar) rear, measured when cold (when the car hasn't been driven for at least several hours). After that, adjust as needed, depending on handling, tire wear, etc.

 

[willabeest]

I would start with the pressure at the Honda recommendations of 33 psi (pounds per square inch; 33 psi = 2.28 bar) front and 40 psi (2.76 bar) rear, measured when cold (when the car hasn't been driven for at least several hours). After that, adjust as needed, depending on handling, tire wear, etc.

i have been using 35 PSI cold all around on my michelin sports at the suggestion
of the people who sold me the tires. no problems seems to work fine.

 

[digimanoc]

For what it's worth, here's what I was told buy a tire manufacturer when I asked the same question....
Quote " The auto maker's engineers determine what the tire pressures should be for each car, these don't change even when you go +1 or +2 over stock wheel sizes. It's all base on what air pressure is needed to carry the car, not what tire is on it"

So....I use the stock pressure from the door jam. I'm sure people who track their cars will vary it to change the feel or traction.

:biggrin:

 

[nsxtasy]

Brigestone RE 050

michelin sports

Every tire model (and even different sizes) can produce different results and require different pressures. Unless you can find a recommendation from someone who uses the exact same tire brand and model and size, you will have to use trial and error to find the best pressure. As long as you are using trial and error, the pressures recommended by the manufacturer are a great place to start, since these are developed by the engineers who designed and tested the car. These recommendations are appropriate for the OEM tires. As noted above, they're also useful as a starting point for any other tires. Based on the handling and treadwear and other factors you experience, you can adjust from there as needed.

I have found the recommended 33F/40R (measured cold) to be perfect for handling and for treadwear on the 15"/16" stock Yokohama A022H tires and also on the 16"/17" stock Yokohama A022H tires.

I use the stock pressure from the door jam. I'm sure people who track their cars will vary it to change the feel or traction.

I find that those recommended pressures (33F/40R) work great for the stock Yokohama A022H tires on the street as well as on the track. I have heard some people with 16"/17" tires prefer to use a few pounds less in the rear, but I've gotten perfectly even tire wear on the track with those pressures.

I have found that R compound tires (I have used the Toyo RA-1 and the Yokohama A032R) on the track require less pressure than street tires do on the track (again, comparing cold measurements).

 

[NSXDreamer2]

I find that those recommended pressures (33F/40R) work great for the stock Yokohama A022H tires on the street as well as on the track. I have heard some people with 16"/17" tires prefer to use a few pounds less in the rear, but I've gotten perfectly even tire wear on the track with those pressures.

Ken, you really used 33/40 cold pressure on track?? I had repeatly used 36psi right after the first session (hot pressure) and seems like anything higher than that will give me ride on the "ballon" feel. (But then, I don't have the stock yokohama)

My tire pressure set up was all messed up cuz the same gauge I've been using from day one I had the nsx, the gauge was repeatly off by +2psi, then last time I checked, the gauge was consistent showing the accurate pressure. I couldn't pin point what I used for the track days pressure. Lesson learnt...

 

[nsxtasy]

Ken, you really used 33/40 cold pressure on track??

With street tires, yes.

 

[joove]

The NSX tech at Los Gatos Acura. Gary I believe his name was, was commenting on various things NSX (last week when my NSX was being worked on there). He told me something that seemed to make a lot of sense.

Even if the NSX tyres have really stiff sidewalls. Lowering of pressure will make the sidewalls take more of the strain. The tires, which are softer now, will end up extending your suspension. So for most small bumps, your suspension is not really working as much as it should becuase your tire is flexing. Will probably become more extreme if you are running really stiff springs.

It sounds credible. I promply raised the pressures back to oem (on OEM RE010) and had to reduce the rear stiffness on my konis to compensate. For street driving going with OEM pressures seems smart. Having said that, I feel that 40 is a bit much. I feel more seat-of-the-pants rear grip if I run it around 38. Not sure if 2psi makes that much difference of if the whole thing is just my imagination.

-vamsi