PCM Diagnostics & Tuning HP Tuners | Holley | Diablo

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Old Aug 29, 2005 | 02:00 AM
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Has anyone had a problem with tryin to change there tire size? I put 4.56 gears in a car and put a set of 275 40 mickeys on the car and when I try to change the tire hight to 25.7 it kicks it to 28.07 when I try to save it after recalculating it. Im using HP tuners and this is the first time I ran into this problem.
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Old Aug 29, 2005 | 02:07 AM
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Originally Posted by OrangeSS
Has anyone had a problem with tryin to change there tire size? I put 4.56 gears in a car and put a set of 275 40 mickeys on the car and when I try to change the tire hight to 25.7 it kicks it to 28.07 when I try to save it after recalculating it. Im using HP tuners and this is the first time I ran into this problem.
the problem is the maximum limit in the PCM for the Pulses/Rev value. In earlier years usually 4.11's just scrape in on a regular sized tire.

There is no solution to this apart from upgrading to a later operating system that has a different limit.

Chris...
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Old Aug 29, 2005 | 02:10 AM
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Is this an 1/8th mile car? I'm trying to figure why anyone would need 4.56 gears and tires that small.
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Old Aug 29, 2005 | 02:20 AM
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Originally Posted by gametech
Is this an 1/8th mile car? I'm trying to figure why anyone would need 4.56 gears and tires that small.
No its a 1/4 mile car we bought the trex cam and for now the 275 40 are all we have to play with until our better tires arrive Also thanks for the help
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