Fast EZ EFI for Marine Application

**High Pockets** · 11-02-2011, 08:54 PM

Alexi,

I just bought a new 21' aluminum Jet boat this year but I made a deal with the boat builder that I would supply the engine. Despite everyone I talked to advising me to use an LS engine, I chose to go with a fuel injected Olds 455 just to be a bit different. My Olds has all the good stuff including a full roller valve train, billet mains, forged pistons, h-beam rods, Edelbrock heads, MSD ignition and a custom stainless exhaust. I modified an Offy intake to accept 36#/hr injectors I'm using a 1000 cfm Holley 4bbl throttle body. I'm expecting it to make about 450-500 hp and a pile of torque. Here's where I would appreciated your input. I chose to use a FAST EZ-EFI ECU because it's dead easy to hook up, it was relatively inexpensive for the multiport kit (particularly since it self tunes so no expensive dyno-testing sessions), and most importantly the ECU is advertised as being waterproof. I expected a bunch of retro-boating guys like me to be jumping to this product but so far I'm the only one I know of. Can the FAST EZ EFI product be used successfully in a marine environment for my application? I've got the engine installed in my boat finally but have to wait 'til spring to run it as I live in Canada

and the suspense is killing me.

**BOOSTPOWER** · 11-04-2011, 05:24 PM

I am
Driving back from SEMA, however I will reply when I get back.
Thanks

**Beer:30** · 11-04-2011, 07:08 PM

Originally Posted by High Pockets

Alexi,

I just bought a new 21' aluminum Jet boat this year but I made a deal with the boat builder that I would supply the engine. Despite everyone I talked to advising me to use an LS engine, I chose to go with a fuel injected Olds 455 just to be a bit different. My Olds has all the good stuff including a full roller valve train, billet mains, forged pistons, h-beam rods, Edelbrock heads, MSD ignition and a custom stainless exhaust. I modified an Offy intake to accept 36#/hr injectors I'm using a 1000 cfm Holley 4bbl throttle body. I'm expecting it to make about 450-500 hp and a pile of torque. Here's where I would appreciated your input. I chose to use a FAST EZ-EFI ECU because it's dead easy to hook up, it was relatively inexpensive for the multiport kit (particularly since it self tunes so no expensive dyno-testing sessions), and most importantly the ECU is advertised as being waterproof. I expected a bunch of retro-boating guys like me to be jumping to this product but so far I'm the only one I know of. Can the FAST EZ EFI product be used successfully in a marine environment for my application? I've got the engine installed in my boat finally but have to wait 'til spring to run it as I live in Canada

and the suspense is killing me.

I have an EZ on one of my vehicles and it works just as advertised. The only thing you need to make it work for your app is dry exhaust or at least weld in a bung THROUGH the water jacketing to get the O2 sensor to dry exhaust. It relies very heavily on what is going on with the exhaust mix.

**High Pockets** · 11-04-2011, 10:43 PM

Good point about the importance of the O2 sensors. I forgot to mention ... I TIG welded the exhaust myself and did remember to install O2 sensor bungs that go right thru the water jackets on both headers.

**Beer:30** · 11-05-2011, 07:15 AM

Originally Posted by High Pockets

Good point about the importance of the O2 sensors. I forgot to mention ... I TIG welded the exhaust myself and did remember to install O2 sensor bungs that go right thru the water jackets on both headers.

Good deal.

**BOOSTPOWER** · 11-05-2011, 07:38 AM

Yes it will work if the o2 set up is correct. An absolute must for it to be in the correct spot and get to temperature. A lot of times on the water cooled exhaust the temp is low on the sensor changing the resistance causing the sensor to read off a percentage. In our Boostpower engines that have them, we actually toggle of sensing until the engine o2 heater and overall temp get to a ore determined temp.
With that said, we make stainless steel o2 bungs and try to analyze what the exhaust situation is then pic the best spot to either catch the lean cylinder or the bank. Those systems basically learn a target range the lock it in. Driving during learning in all these types of systems is critical also. For example, if you floor it to plan the boat while it's learning it will dump in a bunch of fuel then after you drive a fire miles it will adjust again. We at times go back in and smooth the maps out when we are done. Follow those instructions well and let us know. Thanks

**doc joe** · 02-16-2013, 07:54 AM

I would like to install a FAST EFI on my BBC Campbell. Is there a recommended spot in these logs to locate the O2 sensor?

**Beer:30** · 02-16-2013, 08:20 AM

Originally Posted by doc joe

I would like to install a FAST EFI on my BBC Campbell. Is there a recommended spot in these logs to locate the O2 sensor?

Personally, I have never had a set of logs, so I don't know how their water passages run. However, a good spot for an O2, in general, is right at the end of where all 4 cylinders come together. Dana makes a "sandwich" plate for their setups. Basically, where the elbow bolts to the main manifold, they have a spacer that has O2 threads in the side - mounting the O2 in the dry area of exhaust. Therefore, if there is a connecting hose where your "tailpipes" connect to the exhaust tips, you could probably make a spacer for the flange. You would just have to shorten the length of the hose to the tips, since the pipe would now be "longer". All of the passages would have to be machined into the spacer to allow the water to continue through and exit - but not come in contact with the water.

EDIT: If FAST really wants to get alot of these systems out there - it would behoove them to make spacers for most setups. A lot of older family boats could be up and running with EFI in a weekend. The O2 bungs are the only real "rigging" that takes time and machining and welding. If FAST had "all-in-one" kits that could be ordered with the "common" spacers already included, more people would definitely purchase the kit(s).

Another nice thing - they make a dual quad version/upgrade as well. So even old school dual-quad and tunnel-ram motors can be switched to EFI!

**BOOSTPOWER** · 02-19-2013, 04:52 AM

Originally Posted by High Pockets

Alexi,

I just bought a new 21' aluminum Jet boat this year but I made a deal with the boat builder that I would supply the engine. Despite everyone I talked to advising me to use an LS engine, I chose to go with a fuel injected Olds 455 just to be a bit different. My Olds has all the good stuff including a full roller valve train, billet mains, forged pistons, h-beam rods, Edelbrock heads, MSD ignition and a custom stainless exhaust. I modified an Offy intake to accept 36#/hr injectors I'm using a 1000 cfm Holley 4bbl throttle body. I'm expecting it to make about 450-500 hp and a pile of torque. Here's where I would appreciated your input. I chose to use a FAST EZ-EFI ECU because it's dead easy to hook up, it was relatively inexpensive for the multiport kit (particularly since it self tunes so no expensive dyno-testing sessions), and most importantly the ECU is advertised as being waterproof. I expected a bunch of retro-boating guys like me to be jumping to this product but so far I'm the only one I know of. Can the FAST EZ EFI product be used successfully in a marine environment for my application? I've got the engine installed in my boat finally but have to wait 'til spring to run it as I live in Canada

and the suspense is killing me.

Well, nine of those ecu's/harness are water proof that I know of, but anyway. The fact is you can use just about any brand on your engine if the configuration is properly set up.
I personally like em all but yours should be cool! 👍

Sent from My Boostpower Marine Efi Beacon.

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Fast EZ EFI for Marine Application

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