based on a conversation with the VP chief engineer back in 2008-2009 time frame, yes. they specified a different cam profile than the standard GM offering. what they are doing after 2012, I do not know. the ECU hardware for a few years is the same, however the fuel mapping, etc. is completely different. that is also why VP used GM IAC's and Mercruiser ran out of pins and used the Ford IAC (2 wire vs 4 wire)
Ah. Didn’t know that. Is it possible that a VP gxi ecu would change the fuelling to suit my merc mpi and it’s cam then, I wonder ?? It’s not well suited as it is now.
No, besides the different pin-outs, you need to have the ECU fuel maping match the internal parts of the motor. if you change one, you must change the other. if you changed the cam, get your ECU remapped
No, besides the different pin-outs, you need to have the ECU fuel maping match the internal parts of the motor. if you change one, you must change the other. if you changed the cam, get your ECU remapped
I’ve been looking to do exactly that since I’ve owned the boat. I’m was pretty sure it hadn’t been done when built, only because I thought the ecu couldn’t be remapped. By most accounts it can’t...but revently I saw a few engine tuners advertising that they can.
AD, its on the Mercruiser reman'd engine site. they list 350 Crankshaft HP for the 383 (second link below) included both links to show that even the 4.3 is listed at 225 crankshaft hp.
No, besides the different pin-outs, you need to have the ECU fuel maping match the internal parts of the motor. if you change one, you must change the other. if you changed the cam, get your ECU remapped
Oh man. My heads all over the place with it all, haha.
wee bit cheeky of them to quote a differently sourced power rating than the rest of them previously. I honestly thought the top end and other components were tweaked, compared to the older 4 barrel 205 carb motor.
Scott. Just had a look at the quicksilver 4.3 remanufactured. They seem to suggest it’s an all new construction from previously, quoting that it’s an upgrade from the older motor.
also has a 350 carb quoting 300hp, in a similar way.
But to send my confusion into overdrive....it lists a 3.0 carb motor too. In either 130hp or 110hp. This is a downgrade in power from the old 135 motor. Or certainly a change in the trend of quoting more power than the old....my head is frazzled !!
The motor is the 383 with the blue flame arrestor cover. The 5.7 had the 22 pitch Bravo 3 props and had max RPM of 4100 and speed of 40/41.
383 spun the 22 pitch props to 4500. Bought new 20 pitch props from Quicksilver. Front prop is a 4 blade, rear is 3 blade. Saw 4800 max rpm which is at the bottom of the max rpms.
The motor is the 383 with the blue flame arrestor cover. The 5.7 had the 22 pitch Bravo 3 props and had max RPM of 4100 and speed of 40/41.
383 spun the 22 pitch props to 4500. Bought new 20 pitch props from Quicksilver. Front prop is a 4 blade, rear is 3 blade. Saw 4800 max rpm which is at the bottom of the max rpms.
Thanks AD. Not the first time you’ve enlightened me. Haha. Never personally had a bravo. Not sure I’m a fan overall. Well looked after I’m sure they are fine.
