prochargers and boost
 

you guys with prochargers,what size engine do you have,which procharger unit are you running and how much boost are you making?im mainly wanting responses from pump gas users.

502mag mpi
M-3 Procharger
5 1/2psi with 4 1/2 pulley and 30 pitch prop.

572
M-4 Procharger
13 lbs on 93
MEFI

what horsepower does your 572 make

509 MPI, M1, 5-6lbs

540 w m-3 sc, with 3.85 pulley I dynoed at 12-13 lbs of boost on 92/93 octane pump gas (1057 hp), run 14 lbs with 20% race gas with 3.70 pulley (1115 hp). With these smaller pulleys it makes boost EARLY and FAST too if you lean on it anywhere above 3000-3200. It also made about 10-11 psi with 4.00 pulley and just over 1000 hp, Smitty

smitty,what would you concider maximum boost with 93 pump gas?

IF a Prochargerd marine motor has EFI, afr's verified/tuned on water at wot, aluminum heads and compression close to or around 8-1 along with 75-80 MAX degree lake water for innercooler 12-13 lbs is easily reliable, I have ran that kinda boost for quite a while and haven't hurt a motor yet, Smitty

12 or 13 is what i was thinking,that is what i run with my 8.3L whippled 588s.

Had, 540, M4, 10 lbs, fast efi, Boat was sold from person I sold it to. He or I did not have any motor problems.