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911st 911st is offline
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Join Date: Jan 2004
Location: Sacramento
Posts: 7,269
Here are a couple of clues I see.

The factory 3.0 turbo w/o an intercooler targeted a ECR of about 10/1. The 3.3 with an intercooler added came in at about 10.75. Assuming Porsche was targeting the same margin of safety, the early IC allowed Porsche to reach about .75 higher ECR.

Take that 3.0, add a good intercooler and run it at 1 bar boost and it should be running an ECR that is the same as the 3.3 at .8 bar boost.

A 3.3 with an efficient turbo, larger efficient IC is felt by most to be ok at 1 bar boost. That puts us at about a 11.5/1 which is just a bit more than a normally aspirated 993.

Some of the big dogs seem to be living in the area past an ECR of 12+/1.

How about building a 3.3 at 6.5/1 CR and reach for the same ECR as the big dogs here. This should allow us to boost to about 1.5 bar if we do it righ. Take a na motor that should make 250hp and boost it 2.5 atmospheres (1.5 bar) correctly and efficiently and that could make for about 625hp. Remember the "Monster CIS motor" thread.
Old 04-08-2009, 08:34 AM
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