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911st 911st is offline
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Join Date: Jan 2004
Location: Sacramento
Posts: 7,269
If you are talking about using a mag case from a 74-77 911 the max bore is about 93mm and I doubt you would run a turbo on it as that is getting thin. Unless you could find a away to mod the case for a later crank this puts your limit at 2.9.

There is a guy here that built a 2.8tt making 450hp but that is crazy stuff.

Maybe look to other areas for weight savings or just make more HP.

Tial makes a stainless turbine housing that is much lighter. Keep the exhaust plumbing short and w/o heat.

Some wast gates are lighter than the Porsche units.

You could use a 92-95 plastic intake.

A wasted spark system might save some of the weight of the distributor.

The on motor oil cooler can be replaced with a block off plate if the front cooler is sufficient. Porsche did this with the 91 turbo but put an oil filter there.

Most the extra weight is going to be in the intercooler. You could look into a tube and fin intercooler over a normal bar & plate but the B&P seems to make for more performance with a smaller core.

Could go with a low pressure system with say .5 bar boost and 8.5/1 compression and run without any intercooler. This might let you find a turbo with a built in wast gate.

Could consider water or alcohol injection for intercooling.

However, many of the vintage racers dump the mag cases for aluminum for the increase in reliability.

Just a few thoughts.
Old 02-10-2010, 08:06 AM
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