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To turbocharge the S2, you have 2 options. 16V turbo or 8V turbo.
The 16V turbo will cost much more and will be fairly diffcult as most parts must be custom made.. Parts unique to the 16V: Exhaust & intake manifolds. Custom 16V pistons to lower the compression. You will have to sleeve the block in order to get low CR pistons..
The 8V will be much simpler as you can use many parts from the 951. You can use the 2.7L 8V head MY89 944NA, or a modifed (water passage) 951/944 8V head. You still need custom pistons to lower the compression.. (You can actually get away with using the 3L 16V pistons, as when used with the 8V head CR is low enough to get away with it.. Using the stock S2 pistons is not a good choice, but will work marginal performance..
When using 8V head, you might be able to find pistons to work with the Alusil block.. Andial had few sets, not sure of availability any longer.. If you cannot find the low CR pistons for the Alusil block you will have to sleeve the block and get JE or similar pistons..
When using the 8V head, you can use the 951 header, crossover & intake.
Both 16V or 8V require the 951 left motor mount, and intercooler. 951 rods can be used or aftermarket ones. S2 rods are not a good choice for a turbo application..
The S2 DME works fine, just need to reprogram it. Of course, larger injectors and higher fuel pump is needed..
This is nothing but a brief description to what is involved.. Plan on spending serious $$ especially if you pay for labor..
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John
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