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Autocrossers try out the javascript calculator and see how close to what you run for pressures...

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Old Jun 27, 2001 | 10:21 AM
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Default Autocrossers try out the javascript calculator and see how close to what you run for pressures...

I set the weight of the car 3000-3100lbs and the g force to same as Porsche at .8. Weight distribution I set to 60/40. Impressions?<ul><li><a href="http://www.sonnenscheinpca.com/Technical_Articles/autocross_tire_pressure_calc.htm">http://www.sonnenscheinpca.com/Technical_Articles/autocross_tire_pressure_calc.htm</a</li></ul>
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Old Jun 27, 2001 | 10:39 AM
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John, raise your vehicle weight and skid pad numbers, both are too low.
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Old Jun 27, 2001 | 10:42 AM
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also isn't weight dist. on a quattro 58%/42%?
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Old Jun 27, 2001 | 10:50 AM
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I tried adjust the figures to get close to reality but they are way high it seems.
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Old Jun 27, 2001 | 10:51 AM
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Hope not or we're missing some matter, Captain. (58/42?)
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Old Jun 27, 2001 | 10:54 AM
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D'oh! Thanks for the correction!
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Old Jun 27, 2001 | 11:05 AM
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Default specs on audiworld say 60/40 for AWD coupe. is that wrong ?

<ul><li><a href="https://www.audiworld.com/model/tt/01/coupe_specs.shtml">https://www.audiworld.com/model/tt/01/coupe_specs.shtml</a</li></ul>
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Old Jun 27, 2001 | 11:08 AM
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I think in the R&T Guide to the TT it is 60/40 FWD and 58/42 for quattro. Not sure who is right...
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Old Jun 27, 2001 | 11:21 AM
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Default it kind of amazes me, now that i've been playing with the pressure calculator ..

... that despite 60/40 or 58/42 weight distribution, the audi and michelin recommendations are only 3 lbs different between front and rear.

is this calculator for rear wheel drive vehicles only ?
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Old Jun 27, 2001 | 11:34 AM
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Default Here are the weights for the cars . . .

These were all weighed the same day on the same scale at a stone company in Virginia last year.

Stock 225TTQ - 3,270 - 3,290
Stock 225TTR - 3,450 - 3,460
Stock 180TTQ - 3,220

We didn't have a FronTrak there to get those weights. Sorry

As for weight distribution, the FronTrak will be slightly above 60% Front and the Quattro will be slightly below 60%.
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