Re: MERC 5.7 EFI conversion to MPI
Thanks for the replies guys.
Low end torque is what I need (2000-3000 rpm).
Drive is a Bravo 3 with SS 22 props.
What I am aiming for actually is not a 50mph boat but faster planning time and crusing at 30mph at 3500-3800 at salt water (more drug). WOT is a very rare thing with a 25 foot boat in the rough Aegean seas here in Greece.
My Doral 250SE has a hard time getting on plane without trim tabs with dirty props or 4 people on board.(two people and clean props = no problem).
I also usually carrie a full 314 lt tank of fuel and 145 lt of fresh water.
That is way I am looking for more HP without the extra fuel consuption and cost of a 6.2 MPI. (my next choise)
You will not see much, if any noticable improvement in the 2-3K rpm range. Unless there is something wrong with your current set-up.
Do a very detailed parts check-out between the EFI and MPI. There could be parts differences. ECM might be drive type and open/closed cooling differences. Need to check via serial number. For example, some 350 MAGs used cam 431-866022T vs 431-811658.
The 6.2L would make a noticble differance.
