This sounds like a pretty good guide. I have had good luck with 356D's
at 44# front and 52# rear. Essentially the same as your formula. Door
numbers resulted in severe under inflation wear.

jim

--
Jim Henry
Durham, NC
85 gsl-se
84 gsl-se
lot of parts from 85 -se
84 volkswagen westfalia camper
95 aurora
96 olds 88 ls
97 geo prism lsi  - wife's car

TJ Hannink wrote:

>The tire pressures shown in the door jamb are for the
>tires that originally came with the van. If your tires
>match the specifications shown in the door jamb
>exactly, then you can use those pressures.
>
>Tires are load rated at a specific air pressure,
>sometimes different tire manufacturers require
>different pressures to obtain the same load rating on
>the same tire size. The pressure numbers provided in
>the door jamb directly relate to the amount of air
>pressure required for that particular tire to meet the
>GVWR at that wheel position. On a Vanagon, the front
>axle allows for less GVWR than the rear, so the tire
>pressure required to support the front load will also
>be less.
>
>I had posted this to the list back on 9/02:
>There is a formula for calculating the air pressure of
>a non-standard sized/load rated tire using the tire
>pressure recommendations on the sticker in the door
>jamb. Since Vanagons have different pressure
>recommendations front and rear, you need to use the
>formula twice. Also, tire pressure recommendations
>aren't the same for all Vanagon models, use the info
>from the sticker in your van.
>
>It is as follows:
>[Original Tires Max Load Rating] * [Sticker's
>Recommended P.S.I.] / [Original Tires Max P.S.I.] *
>[New Tires Max P.S.I.] / [New Tires Max Load Rating]
>
>The tire manufacturer should be able to provide you
>with a load rating vs tire pressure chart also for
>your particular tire.
>
><http://gerry.vanagon.com/cgi-bin/wa.exe?A2=ind0209D&L=vanagon&P=R10340>
>
>These are the numbers that I use for my tires:
>Original Tire - Load rating "C" or 1,433lbs @ 48 psi
>MAX
>New Tire - Load rating "96" or 1,609 lbs @ 44 psi MAX
>
>Recommended Original Pressure, 39 psi Front, 48 psi
>Rear
>
>Calculated Pressure for my tires, 33 psi Front, 40 psi
>Rear
>
>If I assume that your Yoko's are rated 1,850 lbs @ 65
>psi MAX, the calculated pressures are 41 psi Front, 50
>psi Rear.
>
>Good luck,
>
>
>
>=====
>TJ Hannink
>Goldibox - 1987 Vanagon Camper, Wolfsburg Edition
>Winter Park, Florida
>http://home.earthlink.net/~tjhannink/
>http://groups.yahoo.com/group/wolfsburg_campers
>http://photos.yahoo.com/tjhannink [Vanagon] Album
>
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