Header/manifold dyno test

junkyardhero said

and that's the key! anything past a stock cam the gains are much more impressive and the argument of price for hp/tq starts to swing back toward favoring headers.

jim, with your experience and analysis is there a hard break off point in lift where the for/against is a good line of demarcation as they say? in a mild street combo, that is.

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I have not experimented like that with the V8, just the slant. If I had to guess it is like everything else it is just a progression. Part of the problem is everything is intertwined. The minute you start upping the cam you start lower cylinder pressures so you should up the compression to compensate which will give more power and a different answer. That is what was so confusing about trying to do comparison runs when I started running the models. You can't just change one factor and do a comparison because the minute you change one factor you have de-optimized something else that you should update first but then you are changing 2 or 3 things at a time and what does the result mean then? I have just designed an engine (or used someones build) then changed between stock and headers to see what it does.