Error in HPTuners Speedo Calibrate window

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01-21-2007, 07:18 AM

#11

wkdivr

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To measure you tires to indlude the "squish", why not put a level on the top of the tire, level, and measure the "true" height? Maybe that would work.

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01-21-2007, 07:59 AM

#12

KySilverado

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Quote:

Originally Posted by shimp

I gather the best way is to just keep trying different tire sizes in tenths of an inch at a time or so until I get my speedo back to being matched with the GPS. It literally used to be dead-on at any mile per hour with the GPS. Will I need to recalculate the Transmission tables to stop it from getting off with higher speeds or will it all fall back into place if I leave the tables alone because they were perfect before?

That the way I did it. Tire size calculator to get me close then just drove down the road with GPS and made small changes. Got down to .01 changes before I was finished.

I let it automatically scale transmission tables and it worked great.