Quote:
Originally Posted by Kyle2k
I could care less about the speedo, I swear I heard someone say the transmission needs to be tuned to shift properly on the auto though?
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If you don't change the gear ratio to match the gears in the calibration (tune), you will constantly get ABS brake related Diagnostic Trouble Codes (DCTs). This is because the computer constantly monitors each wheel's speed (RPM) and expects the reading to be within a certain range. The range it looks for is determined by several factors such as gear ratio, transmission gear, and engine RPM. If the programmed gear ratio is incorrect, wheel speed will be outside the range and you will get DCTs. The transmission control module also uses wheel speed along with other factors to determine when to shift into a lower or higher gear. If the wrong gear ratio is in the calibration, wheel speeds will be out of range and the transmission will not shift at the correct time. So you are correct that it will not shift properly. Personally, I would only drive the car from the gear shop to the tune shop to have the correct ratio put in. With the DCTs and screwed up shifting the car's driveability is going to suck. I would try to find a tuner who is willing to work with you. Explain your plans and see if you can work something out.