RSflared72e

Looking for opinions from folks with direct experience of turbocharging 3 liter 16V engines (in this case, my 91 S2). This will NOT end being a 500 HP grenade engine, the goal will be an occasional DE event street car with a modest increase over typical 951 power, perhaps into the 300-350 HP range. This shouldn't be too tough with a 3 liter turbo.

In reducing the compression ratio, new piston$ are of course my (technically, not financially...) preferred route.

Main issue here: opinions seem to vary about how much wiggle room is available in the stock S2 pistons to dish/machine them down to a reasonable CR but with adequate piston thickness remaining.

Otherwise, this particular car seems to have a very solid bottom end; no running problems and the original rod bearings had virtually no wear. The head will be undergoing a full P&P/rebuild. Will address intake manifold & turbo plumbing and selection along the way, of course.

Other questions: who has the best (if any) wide-fire-style head gasket for this 3 liter application - Powerhaus, etc.?

Necessity of Carillo/Pauter etc. con rods?

Regards Al

Russ Murphy

Al,
You should talk to this guy- <a href="http://www.andersonmotorworksinc.com/internal_pages/conversions.htm" target="_blank">John Anderson Motorworks</a>
There's a S2 turbo conversion on this link.