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The Head Gaskets will be the first to go unless they are new or recently (last several years) done.
10 to 12k is a average cost by the time you add up all the extras that go along w/doing it
Have you read any of the Boost threads on here?
like the Twin Screw thread?
I did one on adding N2O, that's works too (although it has its downsides, keeping the tank pressure consistent is one) for your engine you could get away spraying another 50 to 75 HP, main thing is managing Knock (removing timing) if it's under boost or spraying.
As Eric stated the electronic Fuel Injection is a major consideration, although a vacuum controlled Fuel pressure booster can be added, IMO pulling Timing under boost extremely important.
Tuning will require monitoring & logging your AFR so you don't run lean under boost. Knock sensor(s) can be installed along w/ a Vampire unit to control it
Most of your questions have already been answered, in various boost threads.
Good luck,
Dave K
Thanks for all the info. I’ve started reading through those forums. Given things would a turbo be a better option?
Turbo(s) require more plumbing, and the need to run and pump oil to the turbo, and on a 928 w/o modding the floor pans there is no room to mount Turbo(s) up close to the engine so the rear Turbo is the best option for a 928 IMO.
I've seen a few nicely done examples at our gatherings, however the Centrifugal SC is the easiest install (especially if non-inter cooled).
Higher compression engines can be boosted, however boosting pressure is limited, it's all about controlling AFR and Knock and where adding more boost doesn't buy you anything additional (trade offs).
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