Quote:
Originally Posted by zonker
for example, the white rag gets better mpg from a 2.25" dia. aluminum tube (with 144cc injectors) between TB and MAF, and gets more power when i use a 2.75" dia. tube (with 168cc injectors). the smaller tube increases air velocity thru the maf sensor which advances timing and enriches fuel (which i lean back out with the slightly smaller than oe 152cc injectors).
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Something we are forgetting is harmonic tuning, Diameter and length can affect this. If you have the length to put a long pipe out your intake this does make a very significant effect on power/fuel usage and has nothing to do with intake restriction. Throttle body spacers do this to a very small degree as well. Now if the length could vary with RPM we would have a winner as the effect could then span the RPM band.
Cheers
Ryan