Hoosier Tire Pressures

[PCA7GGR]

This coming season, I am switching from a 914-6 on Yoko 032s to a '70 widebody 911 on Hoosier R3S03 (245/45s and 225/50s on 9/8X16s).

I know that the Yokos and Hoosiers prefer different tire pressues. So, what tire pressures should I start with and what should they be hot? Thanks

[cstreit]

First, what does your car weigh, as this has an impact? In general you want to end up in the 36-38 lb front and 38-40 lb rear when hot. Do not let the tires get above 40 hot or they go greasy really fast.

Cold pressure start around 28-32 cold and measure once hot

[campbellcj]

I have been playing in the 36-40 (hot) range in my 914 as well. Unlike the Kumhos and some of the other -R tires, the Hoosiers really did not seem happy at lower pressures.

There are guidelines on the Hoosier web site, which are in the same ballpark.

[MMARSH]

In my 911, 2270 lbs. it likes 40/42 hot in the front and 42/44 hot in the rear.

[PCA7GGR]

This is great - thanks for the responses. I knew that the Hoosiers like more pressure but I just didn't know how much.

[cstreit]

I should refine my suggestion a bit...

For autocross you may want to go a few pounds higher... (Like MMarsh suggested)
For lapping try my original recommendation...

[campbellcj]

Yesterday I dropped my pressures to the 32-35 range on an old rock-hard set of R3S03's and they felt pretty decent. It was a cool day with ambient temps in the mid-50's, plus the track was recently repaved/oiled, so grip was a bit compromised.

I guess there is no substitute for repeated, controlled 'testing' for figuring out tire pressures. Yet another skill I need to improve next year.

[Randy W]

Hoosier R3S03 245 and 275 -17 on a 2300 lb 911: 34 front and 38 rear hot is what I have found works best.