How many PSI do you run in YOUR tires?

[SVOboy]

If you search around darin did a coastdown test and found that the improvements aren't that much when you get above 50 psi.

I run 50 all around.

[Compaq888]

interesting..
The most I ever ran was 55psi in my last car. In my current car I try 40psi, sometimes I forget about it, my rear is probably around 15psi..lol

[1337]

Compaq888 What do you drive?

[vtec-e]

Firestones running at 50 psi with a sidewall max of 44psi. The uneven wear from when i got the car is still there. They were "underinflated" at 32 psi and wore more at the shoulder than the centre.

ollie

[1337]

Originally Posted by Frank Lee

Your temps have risen recently right?

Frank-

The outdoor temps during my most recent trip (a little less than 1200 mi last weekend) were actually lower than my last long trip. Last weekend, I saw outside temps of 35-55 degrees, and I managed close to 40mpg (see my fuel log). The trip before that was considerably warmer, but I had lower tire pressure and was a few MPG lower.

[CapriRacer]

As a tire engineer, I find it very funny that if a reference pressure is mentioned, it is what is on the sidewall and not once is the placard pressure mentioned! This shows a bit of misunderstanding of the physics involved.

[tasdrouille]

Originally Posted by 1337

tasdrouille-

Have you ever had a problem running at 60 PSI? I'm considering running 55 or 60 in my tires. I bet the ride in the city would be hell, but 95% of my driving is highway, so I wouldn't mind.

Never had a problem wear wise. Performance wise, I can't tell, but they always did the job I wanted them to perform.

[blueflame]

Ride is hell at high pressures, but my ultramicrocar is a hardriding buzz box anyway and I enjoy getting over 70mpgUS and very long EOC glides...

Which is kinda FE heaven

[bwilson4web]

Hi,

Originally Posted by CapriRacer

As a tire engineer, I find it very funny that if a reference pressure is mentioned, it is what is on the sidewall and not once is the placard pressure mentioned! This shows a bit of misunderstanding of the physics involved.

I've read SAE Paper 800087 and it is a good source. I'm new here but was wondering if any of the members have used the coast-down test protocol to measure pressure effects on Crr?

Nothing like a little observation for cementing a good model.

Bob Wilson

[wagonman76]

I usually keep mine at 30-35. They are rated at 44. I would go higher if Michigan had good roads. It handles much better at 40 but every pothole and every expansion joint every 100 ft is hell. I already have to replace balljoints once a year.