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-   General Q & A (https://www.offshoreonly.com/forums/general-q-20/)
-   -   Which EFI system would work best/be the most simple (https://www.offshoreonly.com/forums/general-q/330835-efi-system-would-work-best-most-simple.html)

Unlimited jd 09-18-2015 08:28 AM
Originally Posted by Cory H (Post 4355665)
I have 2 Cutler MPI systems that came off older 502's. One system is 100% operational. The other has a bad ECM. !00% complete, including fuel pumps. Make offer.
Tried to pm you but the site is fubar..... Send me an email [email protected]

Tmaddox4x4 09-18-2015 10:11 PM
Stay away from FAST, I and a few other guys I raced with ran it in our offroad rigs. Go with Holley, and make sure all your grounds are solid.

brian41 09-19-2015 07:11 AM
Originally Posted by Tmaddox4x4 (Post 4356322)
Stay away from FAST, I and a few other guys I raced with ran it in our offroad rigs. Go with Holley, and make sure all your grounds are solid.
Solid and separated from all other grounds.

Wildman_grafix 09-19-2015 07:22 AM
Originally Posted by brian41 (Post 4356387)
Solid and separated from all other grounds.
When you say separate from others do you mean then that it is a floating ground?

sutphen 30 09-19-2015 08:05 AM
Originally Posted by Wildman_grafix (Post 4356389)
When you say separate from others do you mean then that it is a floating ground?
not floating,thats a bad thing for the ecu and sensors,,he means a different solid ground point and usually have it go back to the battery terminal.ground loop noise is always a problem w/ high energy ignitions,just trying to keep that noise in check.

brian41 09-19-2015 08:06 AM
Originally Posted by Wildman_grafix (Post 4356389)
When you say separate from others do you mean then that it is a floating ground?
Separate by not putting any of the EFI or ECM ground wires on the same bolt or stud as any other systems grounds especially if the other ground has a relay in it. The head or block are good isolators and normally have a few extra threaded holes that are not being used. More important than any of it is to run the main +/- for the ECM directly to the battery no mater how far away it is.

sutphen 30 09-19-2015 08:09 AM
Originally Posted by Pliant (Post 4355987)
Marine efi is either very basic or very expensive. The underlying speed bump is a wet exhaust system OS sensors don't play well so your left with speed density..... Which means a carb jetted properly is going to do just as well at about 1/5 the cost......well pretty close to that.
not quite true,,O2 is for setting and keeping the afr's in check when in closed loop mode or O2 real time correction.Speed densty is just the type of control,it uses the MAP sensor and then theres the other type that uses the MAF(mass air flow) and for really big cams,there is Alpha-n,which just uses the TPS sensor.

Wildman_grafix 09-19-2015 08:35 AM
Originally Posted by brian41 (Post 4356401)
Separate by not putting any of the EFI or ECM ground wires on the same bolt or stud as any other systems grounds especially if the other ground has a relay in it. The head or block are good isolators and normally have a few extra threaded holes that are not being used. More important than any of it is to run the main +/- for the ECM directly to the battery no mater how far away it is.
Ok that makes much more sense. I would think back to bat would be the way, thanks.


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