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Re: ECUtune 1av1 question
Like he said, the final drive ratio isn't an issue for the ECU. It is an issue for the TCU though. The final drive ratio is programmed into the transmisison control unit. The TCU uses it to translate the vehicle speed sensor 1 signal into a speed reading. The speed calculated from vss1 is one of the most important parameters the TCU uses. If you do not reprogram the TCU to match the new 4.44 final drive ratio then it will be 25% off in everything it calculates and looks up using that value.
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