BADASS of New England

An automobile club for the enthusiast who enjoys the last of the big GM cars. The rear wheel drive B and D bodys. Chevrolet Impala SS, Caprice, 9C1, Buick Roadmaster, Oldsmobile Custom Cruiser, Cadillac Fleetwood
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 PSI question

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Posts : 4211
Join date : 2009-12-16

PostSubject: PSI question   Sat Apr 27, 2013 8:11 pm

The 17" hankooks I have say max PSI is 50.

Now, given that the tires are wider (even wider in the rear), but not taller, than a stock 9C1 size tire, what is the BEST PSI for this situation?

They look pretty under inflated to me but I don't want to over inflate and trash the treads on the highway.
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Club President

Posts : 6870
Join date : 2009-01-20
Age : 40
Location : East Hampstead, NH USA

PostSubject: Re: PSI question   Sat Apr 27, 2013 8:17 pm

I usually run 35 psi in my cars. Keep an eye on the wear pattern. If they wear in the middle, lower your pressures. If they wear on the outsides, add a couple psi.

Bill "The Verb" Crovo - Resident Car Slut & Unicorn Hunter

A Toasted Marshmallow, A Long German, A Lame Suburban and expensive dreams...
Missing all my previous B's, D's and V... Sad
American Ricer
"Ooooh! Look! Something shiny!"

LOWER IT!!! Wink
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Posts : 4278
Join date : 2009-03-20
Location : Revere, MA

PostSubject: Re: PSI question   Sat Apr 27, 2013 10:20 pm

I'm NEVER over 35
I like 32


96BBB 28K 3.42 Bolt-ons
95BBB 100K 3.73 383 New DD...already broke fixt the 4L60E twice
95 Black WB4
96 Black WB4 No holes in this
95BBB 189K 3.08 Old DD Matt. Cool
Whine..eee...Silver LS6
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phantom 309

Posts : 257
Join date : 2009-10-11
Age : 106
Location : in the gr8whtnorth

PostSubject: Re: PSI question   Sun Apr 28, 2013 12:20 am

what size tires?

tire pressure depends on how you drive the car,.how tall the sidewalls are,. how much weight you're carrying,.

a tall tire will squirm under hard cornering,.

an underinflated tire runs hot,.and deflects a lot when you hit an obstacle (pothole)

tall underinflated tires break belts,. separate belts etc,..

underinflated tires use more fuel,.

underinflated tires may wear evenly,. but they will wear faster,.

on any of my 255-50-17's i run them at 40 psi minimum,.
60psi when i,m flogging the tires on a road course,.

the minivan tires are 215-65-16,.i run them at 38,.
the fancy ford has 225-60-16's,..i run them at 40.

I run my 11X24.5's at 105.

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Posts : 4211
Join date : 2009-12-16

PostSubject: Re: PSI question   Sun Apr 28, 2013 12:30 am

Thanks guys. I'm not sure 35psi is what I'm looking for here.

Nick, I'm running 245/45ZR17 (17x8 rim) front And 275/40ZR17 (17x9 rim) rear.
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