Toyota Trucks: Is my tire pressure ok?

First thing in the morning.

"bobby F" <net> wrote in message
news:bay.webtv.net... 

"bobby F" <net> wrote in message
news:bay.webtv.net... 

Tire pressure on standard passenger/light trucks is always read cold. If
you're at Daytona, that's a different story. So the answer to your
question is "first thing in the morning."

D

bobby F wrote: 

to add to those who responded...yeah, read it when cold. Now is 40 psi
too much? What truck do you have? My 2003 Tacoma 4x4 SR5 TRD off road
says 26 psi cold for the front, 29 psi cold for the rear.

I usually go 3-4 lbs over the recommended. Yes I think 40 lbs is way too
much. Doesn't it ride awfully rough (I mean more than normal). Try
lowering and see if it doesn't ride a tad better. Consumer Reports pans the
Tacoma ride (they think it should ride like a Buick) - yours has to be
jouncy.

"bobby F" <net> wrote in message
news:bay.webtv.net... 

On Wed, 04 Feb 2004 01:10:25 GMT, TacomaDude <net>
wrote:
 

That's too low.

I don't care what the OM says. Factory recommended pressures were
arrived at by engineers who want a nice soft ride and by people who
sell tires.
Whatever is stamped on the sidewall... that's where I run 'em. I've
never had a tire wear out in the center before the edges were also
gone.

But wear and ride quality aside, the real issue is hydroplaning:

http://www.tirerack.com/tires/tiretech/general/airpress_vs_wetperf.html
(photos)

http://www.msgroup.org/TIP035.html
(quoted below)

"Of course the word 'fast' is a relative term. Tread design, tread
depth, weight of motorcycle, tire pressure, depth of water and even
the consistency of that water - (whether it is highly aerated or not,
for example) - all play a part in determining at what speed the tire
will begin to hydroplane. It is a pretty safe bet to assume that any
speed in excess of 60 MPH is fast enough to support hydroplaning
regardless of the other variables. This is not to say that at 55 MPH
you are safe, however. (A formula that comes close to predicting the
speed at which you will hydroplane, assuming at least .2" of water on
the ground, is: 10.27 * Sqrt(tire pressure) which shows that if your
tires hold 35 psi, hydroplaning can be expected at 60.76 MPH, while
tires with 41 psi of air in them should expect hydroplaning at about
65.75 MPH. Another formula that is somewhat more accurate, though much
harder to calculate, is: 7.95 * Sqrt(tire pressure * contact patch
width / contact patch length). This formula shows that the wider the
contact patch is relative to its length, the higher the speed required
to support hydroplaning.) "




--- Rich
http://richlockyer.tripod.com/