This is what are changed from original right one to left new one.

http://www.offshoreonly.de/phpbb/dow...3794&mode=view

Looking at your left table it does look like one I have but with the stock rev limit, not 5400. The origin of that file is a little unclear but I have notes telling it could be an Arizona Speed Marine modification.
However I do also have a file which I have marked Stock 502 MPI and that one is still little different from your table on the right. There is a possibility that there are a few different files for 502 MPI out there released from Mercury.

All have see what im looking for, now i have delet the pictures.

Hello Alex
you are from sweden ?
I have a EFI, its the same i now, but it was one of the first programmed 502 in the year 1993. So im looking for some programmes from later models.

Have you some files for me ?? Stock ore modified ? My email are [email protected]

my idea are, i set to:

High RPM Fuel Cutoff 5240
upper RPM for F1 4800
Slope for F1 0.00363
max advance to TDC 38.1
all 40.1 in the tabel set to 38

map 100 = 3600 = 29.9
map 90 = 3600 = 28.1

Max than at WOT 34.256

Mike,

I have mostly been modifying for super charging, don't think I have anything ready for you. If you have MefiBurn you can download your current mapping and modify to your wishes.
Send me a pm or email me at [email protected] if you want to discuss more details.

I have changed some small numbers and it works very nice with my engines. Boat runs 9kmh more now.

I have now another question.


Fuel.

What Fuel are better for my engines ??

95 E5
95 E10

Did it make a diffrend Fuel Tabel ore spark advance ? Ore did i feel no diffrence ?? I have a little diffrence in $. :-)

I have used my programming this full summer time with no problems.

I'm right with my black engine theory.

Hp500efi have 500hp this are 470hp propshaft.
502efi have 415hp propshaft.
55hp different
With better exhaust and open the upper Rpm programming the engine became some more power.
I don't not now how many more, but it is a lot more.

I changed from 72 to 80 in cold and 78.8 in hot weather, twin 502 engines.

The Mefiburn makes a perfect job. Thank you to Bob and all the help and time he did for me. Thank you.