Quote:
Originally Posted by semtex
Well, the thing about advertised gains, I've noticed, is that it's always the gain if that's the only mod and everything else is stock. In other words, it wouldn't surprise me if one really could get a gain of 20hp from just the headers -- if that's the only thing they did. As I'm sure you're well aware, once you start doing multiple mods, diminishing gains comes into play. I did the headers after I had already done the CBE and HFCs and intake. If you look at my dyno from the intake, for example, I got a nice gain out of that, even though I did them after the CBE and HFCs (+14.7 whp). But I think by the time I got to the headers, everything in my intake/exhaust was already pretty well opened up, hence any additional gain from the headers was minimal. Here's a link to my journal thread, btw. You can use it as a jumping off point to all my other dyno charts along the way if you want. Semtex's Monterey Blue 370Z |
The other thing about gains, is that it applies to the peak output.
It never makes claims based off an average increase...the only thing some of them do is post dyno charts, but even those can be a finaggled. And, Dyno runs have a fault in that they show results only under wide-open throttle, and not under a given throttle condition or varying engine load...or going down the road at 45MPH (overall efficiency increases) - or accelleration between 45 and 75....
For example, a turbo can boost top-end HP by a TON under WOT conditions, at a given RPM or above. Looks great on paper - makes 700WHP. However, the torque curve is jacked, and from 3K and below, it makes less HP...
All I know is that the more air (and fuel at the correct ratio and dispertion) I get through an engine, the more power it will make.