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Just inquiring when an engine is fitted with multiple throttle bodies, with the inlet side enclosed in a plenum chamber( similar to the old air box used on Webers); would the MAP then become stable enough to use as a tuning perimeter ? I haven't built this engine yet, just looking for background info. Cheers.
Unfortunately you will still be best to tune this sort of intake on TPS for the load axis. The MAP signal is post itb so adding a plenum on front of the itbs won't really help the MAP signal.