Boosted Performance round 2 list

Boosted Performance

The HP rating has a lot to do with the turbine size. For example, the 67mm billet compressor turbo will flow 93lbs/min of air. That is as much as twos GT2871 turbos (common with a twin kit).

However, what some don't realize is that all this air/volume the compressor pushes out has to go through the turbine as well. Not only that, but it has to go through it at much higher temperature due to the addition of fuel during combustion. This is why the maximum power potential of a turbo should always be looked at and combined with the largest turbine available for that turbo.

The 6766 has made 800whp on the 2JZ in the past, so I think it is safe to say that 700whp is achievable on the 3.7L VQ. Of course, real world testing would be the best way to find out what the maximum power output would be with this turbo. To do this properly, a bung would be welded on to the manifold, before the turbo (turbine) inlet so that exhaust back pressure can be monitored.

The exhaust pressure before the turbo should never exceed the 2:1 ratio to boost.

So if you are going to run 20psi of boost pressure, the exhaust pressure before the turbine (not the down pipe/exhaust) should not go over 40psi (less is better/more efficient).

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