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310 at the wheels is low for forced induction. I think most of the properly tuned ones are getting a bit more than that.


Certainly it is possible to build an NA NSX that puts out the kind of power you are talking about - the shops building NSX race cars have been doing it for years.


The two problems are the cost (in both time and money) of trying to do it yourself and reliability of the engine once you've built it. I really doubt an ITR putting out 400 rwhp with just a bolt-on supercharger is going to run very long before it develops some problems.


There are many, many variables here but in general you shouldn't expect to run compression as high as a car with a smaller engine can because cylinder volume and bore size play a part in max compression with a given octane fuel before you get detonation.


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