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There are superchargers available for 85.5 to 87 N/A. The 1988 had different compression ratio, so I'm told a supercharger won't work so good. I don't know about prior to 85.5. Below is a reply from a source for superchargers.
From: pburch@chattanooga.net
Sent: Thursday, September 16, 1999 10:05 AM
To: Harp
Subject: Re: supercharger
Good morning:
Yes, we do have a supercharger kit for the 85.5-87 944. We don’t have anything for 1988 on, nor the S or S2. The reason is that after ‘87 the stock compression ratio is too high for any reasonable amount of boost, i.e. supercharging wouldn’t be cost effective. Since the 944 kit is intended to be strictly a bolt-on the higher CR precludes supercharging the later models. We have also found that as a group the 944 owners aren’t generally willing to do internal engine work to accomodate supercharging. This is in direct contrast to the 911 owners as a group.
We don’t have any quantitative data on engine life. Obviously if you extract that much more power out of a machine, and do it often, then wear is going to increase. No doubt about it. How much is hard to quantify, particularly since the kits usually go on cars with some miles on them already. We’ve not seen any catastrophic failures (that we know of) in the 944 kits, but the potential is always there in any boosted engine (supercharged or turbocharged) particularly if a load of bad fuel is encountered or if the user attempts to run track events using street premium fuel.
Thank you for your inquiry.
Paul Burch
Supercharging of Knoxville
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