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Old 05-29-2009, 10:32 PM   #14
Scooby Specialist
Member#: 4498
Join Date: Feb 2001
Chapter/Region: NWIC
Location: Portland, Oregon
WRX H6-3.0 Turbo


Originally Posted by n2oiroc View Post
great test! its nice to get some honest feedback instead of the usual sales pitch.
Originally Posted by Clark Turner View Post
Making power with turbo cars is about removing airflow limitations. On this car, the manifold was not the limitation. The limitation is somewhere else. Great test Jeff! I bet some cars will come to life with this manifold.


No worries mates... A test is designed to test a single variable, and in this case the manifold was not a limiting factor, as Clark pointed out. It is clear from the repeatable gains near redline that at higher flow/hp, I suspect there are significant gains to be had. A 35R setup at 25+psi would really show the difference based on what I have seen.

Even with the minimal gains, I would use the manifold on a new build just for the nice layout and construction. It is a beautiful cast with perfect fitment. Based on other manifold I have seen that is saying something.

This is a .63 A/R GT30R, which is at its limits at this power level. There just may not be much more power to be had without a bigger compressor.

As Tim mentioned, a test on his car will be more telling. As with this, we will do runs before and after within a few hours to reveal the real differences.

No one commented on how smooth my AFRs were.. ;( Just kidding, they look perfect just because of the scale.

Jeff Sponaugle
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