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Part throttle shifting is tuned by mph at a TPS percentage in a selected gear. For starters, the downshifts speeds can be cranked up, so you can actually use First gear over 10 mph.
Carputing ECM Editing Software - In A Flash

 Part throttle shifting is tuned by mph at a TPS percentage in a selected gear. For starters, the downshifts speeds can be cranked up, so you can actually use First gear over 10 mph.  View Related Article

 

 

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