Autocrossers try out the javascript calculator and see how close to what you run for pressures...
06-27-2001, 11:34 AM
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well it's a Porsche club calc. so probably assumes some different criteria.
3 lbs difference f/r is key though for pressures in the TT. Everything seems in balance.
06-27-2001, 02:35 PM
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Try 285/40's on the front and 225/45's on the rear of a TTQ ...
at something around .9 g. Check the tire pressures. Surprised? or not?
FWIW: The program appears to use tire load and relates that to load capacity of a given size tire. It has to assume some CG height, but among sporty cars that doesn't vary much from about 20-22 inches.
FWIW: The program appears to use tire load and relates that to load capacity of a given size tire. It has to assume some CG height, but among sporty cars that doesn't vary much from about 20-22 inches.
06-27-2001, 04:19 PM
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ROTFLMAO!!! I just keyed in REAL data for the submarine, and...
...it told me that I needed to be running 67/48 PSI!!! By real data, I mean the sustained lateral acceleration as measured by GEEZ, and the weights/ratios as measured by the SCCA's official event (corner-weight) scales when I got bored working in impound a few weeks ago. Well, let's just say that those are nowhere near the front pressures that I run.
So, my advice is that everyone treat this [stupid] program like a fortune cookie. Read it, chuckle at what it says, and crumble it up. How can it calculate tire contact patch area when it never asks for the diameter?!?!? I won't even go into the cornering weight being applied to the outside tires being higher than the vehicle weight. Oh, they must mean cornering *force* or something, which any high school physics student should have caught.....
So, my advice is that everyone treat this [stupid] program like a fortune cookie. Read it, chuckle at what it says, and crumble it up. How can it calculate tire contact patch area when it never asks for the diameter?!?!? I won't even go into the cornering weight being applied to the outside tires being higher than the vehicle weight. Oh, they must mean cornering *force* or something, which any high school physics student should have caught.....
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