50hp Merc

[looseunit225]

hey guys my mate has got a 50 hp EFI 4 stroke merc on the back of his fishing boat and it just really doesnt preform!

its slow out of the whole slow top speed and porposes sometimes!

i have made some adjustments to get rid of the porposing

But we want more HP

can anyone tell me if i can change the fuel and ignition mapping to a 60hp i know they are the same engine but the fuel and ignition mapping are diffrent so can i get a down load or do i need to change the computer if i need to change the computer where can i get one at the right price!

also the prop has a 12 X 13 vengance prop on it and i rekon personally the prop is way to small and should have something like a 12 X 17 on it!

or what about the fuel and ignition mapping of a FORMULA RACE engine?? hint hint nudge nudge RON

[Fast Fred]

cam, check to see if the cam is the same. NOS

[looseunit225]

do you mean the actual cam or just the cam timming?

anyone got specs on the engine?

[Fast Fred]

yes, the cam shaft, make sure it is the same.

[looseunit225]

i got told by a mercury dealer that they are identical engines!

but as you say could be the cam shaft!

[JohnsonM50]

i got told by a mercury dealer that they are identical engines!

but as you say could be the cam shaft!

Being a dealer may or may not make the guy an expert.. you need part #s

[JohnsonM50]

hey guys my mate has got a 50 hp EFI 4 stroke merc on the back of his fishing boat and it just really doesnt preform!

its slow out of the whole slow top speed and porposes sometimes!

i have made some adjustments to get rid of the porposing

But we want more HP

can anyone tell me if i can change the fuel and ignition mapping to a 60hp i know they are the same engine but the fuel and ignition mapping are diffrent so can i get a down load or do i need to change the computer if i need to change the computer where can i get one at the right price!

also the prop has a 12 X 13 vengance prop on it and i rekon personally the prop is way to small and should have something like a 12 X 17 on it!

or what about the fuel and ignition mapping of a FORMULA RACE engine?? hint hint nudge nudge RON

B4 doin any serious motor work check the boats basics, weight, condition of bottom, aqua/aerodynamics, setup and the best prop,, might be less pitch than whats on it. With all that sorted out then motor work can really help.

[Mark75H]

or what about the fuel and ignition mapping of a FORMULA RACE engine?? hint hint nudge nudge

Same as the std 60 ... there are NO changes to the powerhead for the FR engine

[mercguy]

i got told by a mercury dealer that they are identical engines!

but as you say could be the cam shaft!

they have the same cams..........the ECM is different (different mapping), pretty much everything else is the same......

[looseunit225]

how do i get my hands on a 60hp computer than?

the boat is pretty new and a well known hull!

im going to run some diffrent props on it and see how i go also but really would like the extra HP