I have a set of Dunlop Sport 4000 Z-Rated tires.

The tires say the maximum tire pressure is 44 PSI.

A friend of mine told me that I should inflate the tires until they're within 2 PSI of their maximum pressure...or is it better for the tires in the long run (the goal is maximum tire life) to inflate them to as close to 44 PSI as possible, without going over?

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The only good is knowledge; the only evil is ignorance.

 

A good tire pressure is around 28-29 PSI in the rear and about 31-32 PSI in the front. This works for me anyway...it will probably vary slightly from tire to tire.

 

Inflate them to whatever the sticker inside the driver's side door says. Unless it's a F#$d Explorer....then 32psi should do.

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1990 IROC 350
Mods: Too busy trying to make it run right to mod it.
Airfoil, Dynomax cat-back, MSD coil, 180 t-stat, Bald Eagle tires,
Hypertech fan switch, Accel 23# injectors, Holley AFPR, ported plenum,
Ported Daytona Yellow stock base, Moroso valve covers, other stuff,
Ruger P95DC, hot wife, new oil filter, thick rubber floormats, no cats.
18.0 @ 85MPH since I'm one big-a$$ MF
"It's better to have and not need than to need and not have."

 

try this:
Get some white chalk.
draw a line across the tire with the chalk from sidewall to sidewall.
Back up or drive forward one tire revolution.
Look at the chalk line.
If it is worn in the center, lower the airpressure.
If it is worn on the outside, increase the air pressure.
You want even fading of the chalk.
Might take more than one revolution depending on the chalk and the surface.

Almost forgot, make sure tires are warm before doing this, since you really do not care about cold tire pressure. And you are on a smooth surface.

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LOBC-- SS-84

92 RS Heritage package with a 305 3" high-flow cat and pipe with a Dynomax 3" in dual 2 1/2" out.

84 El camino- 383 CID, Performer RPM, GMPP vortec heads, Holley 750 D.P.(0-4779c), Crane Energizer 274,Dual 3" Flowmaster 40 Series Exhaust, Turbo 350 (375b), TCI 2500 stall, Richmond 3.42 gears, PST Poly graphite Suspension bushings, PST steering linkage, PST springs, Monte SS sway bays, Wheels from a Third gen(does that count?)

 

Sweet, an easy test.

Thanks.