Re: <ALL> Another method to determine tire pressure?

["James Donohoe" <James.Donohoe@xxxxxxxxxxxxxxx>]

>Date: Thu, 13 Aug 1998 14:08:35 -0500
>From: Brian M Kennedy <kennedy@domain.elided>

SNIP...

>My response:  Why 10%?  What's magic about 10%?  (IOW, that technique
>sounds pretty questionable to me -- I think you are more measuring how
>much water is in each of your tires.)

Agreed, but try this out... (reaching back to pull this out of my fourth
point of contact...) 10% for my M5 would be about 3psi, not a ton of
difference-right? The idea being that if you have got the pressure set
correctly then it should not change too much. OK you can get off the floor
and stop laughing at me. :(

>For a more precise way of adjusting pressures, measure tire temperatures
>inside, middle, and outside on all four tires right after a run.  Try to
adjust
>pressures such that the temps are all fairly even (you won't get them
equal;
>just as even as possible).  If the middle is hotter than the edges, lower
the
>pressure.  If the fronts are hotter than the rears, adjust pressures to
>compensate.  And vice versa.
>(Not only does this adjust pressures for the good of the tires,
>it also helps bring your car closer to neutral handling.)

Totally agreed! I have tried to do this by hand but I think I'm wasting my
time. I can sort of tell if one side of the tire is radically hotter than
the other but I may be fooling myself.

>Brian
>
>P.S.  Where's the best place to buy a pyrometer (or a tire temperature
gauge)?

I was hoping you could tell me, <grin>.
Duane- Weren't you talking about using a pyrometer a while back... Are these
things big bucks or what? Can't be that complex; or can they?

- -james

E34-M5 with kinda warm tires, I think

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