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Re: 1983T to 1988 8v n/a: Similar enough for a swap?
Posted by Justin VanAbrahams [Email] (more from Justin VanAbrahams) on Tue, 10 Jan 2017 16:57:01
In Reply to: Re: 1983T to 1988 8v n/a: Similar enough for a swap?, PAteacher, Tue, 10 Jan 2017 15:08:03
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The 8vT has a pretty low static compression ratio and no intercooler in US-spec form. I'm sure Saab was playing it on the safe side and to some degree was already pushing the contemporary turbo envelope, so fair enough. the 8vNA motors have a higher static compression ratio - similar in fact to the 16vT - so putting the turbo on that should yield a nice bump in off-idle performance and will help to reduce turbo lag. Adding the intercooler from a 16v engine is trivial - it's all bolt-in - and will help lower intake temps to reduce the chance of detonation and improve performance at the same time. The combination should yield a pretty nice driver - not as good as a 16vT but superior to a stock low-compression, non-intercooled 8vT by a wide margin. You will need the fuel distributor and ignition distributor from the 8vT to ensure proper fuelling and safe ignition advance, but I *believe* both are drop-in - I think the variable would be ignition, but I'm pretty sure the '83 will have standard Hall-Effect and not the earlier magnetic impulse system - I think that cut was in '81 or '82.

Hmmm... that reminds me - you will probably want to install an oil cooler as well. See Charles Wirt's recent thread on that topic.

The only real concern here would be relative fragility of the '88's bottom end, but 8psi through an intercooler just shouldn't be that big of a deal. That's almost no boost. You probably still have several psi of headroom before anything dangerous is in play.

posted by 12.195.130...

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