Calculated tire height in HP tuners
07-06-2008, 12:44 PM
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Calculated tire height in HP tuners Why is my calculated height 34.03 with stock size tires and 3.73s? When I do this on other files I have, such as a friends WS6, the height is much smaller. Could this be causing a shifting problem in my trans? Got this posted on HP tuner's site also. Thanks for any help!
07-06-2008, 07:20 PM
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If the numbers seem off, you will definitely have trans shifting issues as the shifting is done by TPS vs. VSS. If VSS (vehicle speed sensor) is wrong (or not determined correctly) the PCM will perform the right math with the wrong variables and screw up the shifting algorithm.
07-06-2008, 08:33 PM
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I recommend you put all of your settings back to a proper stock
model and then change what is really different, only that. The
tire you can measure easily, drive over a tape measure and get
the circumference and do the arithmetic for diameter. The only
scalings I ever did were for gears (Final Drive Ratio) and the
tire diameter which I got by measuring.
Note that you don't want to measure resting height directly,
as the tire bulges and squats; circumference however never
changes (steel belts) so take it and divide by pi.
model and then change what is really different, only that. The
tire you can measure easily, drive over a tape measure and get
the circumference and do the arithmetic for diameter. The only
scalings I ever did were for gears (Final Drive Ratio) and the
tire diameter which I got by measuring.
Note that you don't want to measure resting height directly,
as the tire bulges and squats; circumference however never
changes (steel belts) so take it and divide by pi.
07-07-2008, 07:12 AM
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Thanks guys! Yeah I guess I must have slipped at some point or another. In all honesty though, I got a mail order tune a couple years ago and part throttle shifting was a little short every since. Probably something I did though.
Thanks again!
Thanks again!
