Twin Turbo 383 questions

Dave_n_68383S said
I love this type of thread !! 1400 hp !! well there are very simple realities that often get forgotten. Regardless the type of intake charge boost used, the motor is still an air pump.. There are a couple volumetric considerations, but as a rule, 1 atmoshphere (14lb ) = 50 % horsepower increase. So your 1400 hp dream mobile would need to make 900 hp or so without a turbo... Which is fine, but probably means he has a fortune in that motor. This thread is about making 800 out of a 383.. a good running 383 is making around 400 hp so you could get 600 hp out of 14 lbs of boost.. I run 16lb ( blower
- D1SC ) through a 474 and make 790 hp.. I could probably get another 50 hp if I changed the very mild cam profile im running, but I like idling at 700 rpm. Just a reality check. Fun thread.

I believe this to be true in a Supercharged engine since the engine produces the power to move the blower from the crankshaft. However I believe that this is incorrect in the Turbo engine since there is "No" power being taken to move the Turbo. I personally seen a smallblock Chivy that produced a bit over 400hp alone. After the 2 turbo's were installed it produced well over 900hp @ 20lbs boost. This proven on a dyno!

O' a stock 383 produces 335 hp stock. This was said to be with all assys. and at the tailshaft of the trans.. Furds and Chivy's were rated at the flywheel. I have seen the 383/496 produce nearly 600hp.