Re: Add a turbo - labor of love - Saab 900 Bulletin Board - Saabnet.com
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Re: Add a turbo - labor of love
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Posted by JohnK (more from JohnK) on Mon, 4 Oct 2004 10:41:27 Share Post by Email
In Reply to: Re: Add a turbo, Brian, Mon, 4 Oct 2004 10:20:51
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This whole exercise has to be something you are doing as a challenge for the fun of it, because it's probably cheaper to just buy a good used 900 turbo and sell what you want.

To put the turbo into the 90 and retain full APC turbo control, would require swapping in the 85 wiring harness, ECU, APC, distributor, etc. The wiring harness on 85's is notoriously fragile and in all likelyhood you would end up restoring the harness. Further, the non-turbo engine has higher compression and cannot take full boost, so swapping in the whole 85 engine is more practical if you want full turbo boost potential +/-12 psi.

The low pressure option that Simon suggests might be the best approach. Basically you run the turbo at base boost only 5-6 psi so the non-turbo engine doesn't ping itself to death. You can set the boost with the wastegate and not use the rest of the turbo control system. You will need to hook up an oil feed and return line. There are posts on this and people have successfully done the low pressure conversion. I do not know if the non-turbo engine has the hook up points(feed under intake runners and return under exhaust manifold). If not you would have to configure a makeshift oil feed shsyem, perhaps from the oil cooler lines.



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