Interesting read, equal length vs log turbo manifolds

[Aaron]

I've been curious for a while now how my headers affect my turbo performance. I ran across an article recently from a company that produces equal length turbo manifolds for rice cars. Basically, with everything else being equal, the log manifold spooled the turbo about 300-400rpm sooner. The equal length manifold made 48whp more, and 44wtq more from 5,000rpm-8,000rpm. Below 4800rpm, the graphs are nearly identical. So basically, the equal length manifold had no affect on off-boost performance, and a significant advantage on boost.

http://www.full-race.com/articles/Bseri ... riteup.pdf

[The Dark Side of Will]

Some turbo exhaust discussion from GoFastNews: http://www.gofastnews.com/board/engine- ... gines.html

Power gains going from logs to "headers" aren't anything new.

Lots of potential power in well-optimized manifolding. Turbo engines benefit just as much, if not more in terms of absolute numbers, as naturally aspirated engines. Turbo engines, however, feed back exhaust energy to the intake in a very different way than N/A engines, and thus have more complicated energy cycles and dependencies.