Quote:
Originally Posted by turbo_jimbo
That doesn't make too much sense..
Granted I have only opened my hood once to change the oil, but most GM engines use a MAF and a MAP, meaning it measures the amount of air incoming and pressure of the air after it arrives.
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It makes plenty of sense, the ECM is expecting to move a certain amount of airflow at a certain throttle body blade open position. At low RPM the car is referencing a VVE table that is preset by GM and the OEM TB blade size is programmed in (as referenced by Arpad above). Making changes to the inlet tract will have an impact on the tune. A 95mm TB will not be a drastic change, but it’s a change GM didn’t calibrate around. And TB changes can have a significant effect on part throttle response, especially if you do not tune for them.
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2017 Chevy Camaro 2SS A8 Whipple 3.0, Mast Black Label heads, ATI 8L90, Fore triple in-tank pumps, 112mm TB, LPE +52% injectors & BB HPFP, TooHighPSI/Katech port injection, 15” conversion 1066 WHP STD/1027 SAE, 9.10@152.5 (new times coming)
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