Computer Diagnostics and Tuning Technical discussion on diagnostics and programming of the F-body computers

ODBII LT-1 Edit A4 Questions

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Old Jan 23, 2007 | 12:37 PM
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TimChiaretto's Avatar
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ODBII LT-1 Edit A4 Questions

On the A4 page there are RPM values for shifting, there are WOT shift MPH both of which are for WOT and a shift speed in MPH verses %TPS going up to 100% TPS. Which of these actually controls when the tranny will shift at WOT?
Old Jan 24, 2007 | 10:30 PM
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To set WOT upshifts, I set both the WOT shift MPH and MPH vs. %TPS at 100% TPS to the same value.

The RPM value, I believe, is a minimum RPM threshold that must be met before the PCM will command an upshift at WOT. I have not changed this value in my programming so the upshift is always vehicle-speed based. In theory, whatever you set the RPM value to is the *minimum* engine speed that must be reached before there is an upshift. The actual RPM shift speed will likely be higher then this threshold, however, because the transmission shift is not executed instantaneously. Same goes for the vehicle-speed based shift points.
Old Jan 26, 2007 | 07:57 AM
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Thanks, now I know what I need to do.

Tim
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