Go Back  Offshoreonly.com > Technical > General Q & A
Which EFI system would work best/be the most simple >

Which EFI system would work best/be the most simple

Notices

Which EFI system would work best/be the most simple

Old 09-17-2015, 07:45 AM
  #1  
Registered
Thread Starter
 
Join Date: Jul 2014
Posts: 104
Likes: 0
Received 0 Likes on 0 Posts
Default Which EFI system would work best/be the most simple

Looking for a relatively simple EFI swap (if possible) on my set-up.

My #1 question to figure out however if if my camshaft is mechanical and will work with EFI anyway. It is a Crane #268761.
The engine is 505ci with eagle rotating assembly, Merlin Intake, Camshaft noted above, Dart Pro 1 heads, Quick Fuel Carb, Lightning Headers. Makes 610hp/613tq.

Not doing this for a power increase really, just to get rid of the carb and go to EFI for simplicity, turn key and go, etc plus I am not very familiar with carburetor set-ups so when it comes to tweaking them I am just not familiar.

I have seen the FAST EZ EFI, I also see FAST offers a Marine EFI. I know Holley offers the HP system, etc.

With this, if my cam is compatible, my other question would be what to do for the O2 sensors with the lightning header exhaust, surely we can't get the sensors wet.

Thanks for the help as well as recommendations, will be my Winter project!
Superman09 is offline  
Old 09-17-2015, 08:50 AM
  #2  
Registered
 
Join Date: Feb 2012
Location: Omaha, NE
Posts: 257
Received 14 Likes on 12 Posts
Default

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.
Cory H is offline  
Old 09-17-2015, 08:59 AM
  #3  
Registered
 
Join Date: Dec 2013
Location: Minneapolis, Mn
Posts: 358
Likes: 0
Received 2 Likes on 2 Posts
Default

Cant go wrong with Holley HP EFI. You will need 02 sensor in each manifold/header but other then that its "self tuning" for the most part.
turbom700 is offline  
Old 09-17-2015, 09:13 AM
  #4  
Registered
 
Join Date: Jan 2009
Location: Metamora MI
Posts: 720
Likes: 0
Received 0 Likes on 0 Posts
Default

I am running the Holley Hp system.

I have run O2 sensors in my Lightning Headers all summer with no problems

[ATTACH=CONFIG]545256[/ATTACH]

Cam specs: duration @ .050 235 243
lobe lift .3590 .3690
lobe seperation 114.0

I purchased the Holley Hp through Alex Haxby. Alex has been a great help with setting me up with a base tune and helping me with tuning along the way.
Attached Thumbnails Which EFI system would work best/be the most simple-077.jpg  
hadleycat is offline  
Old 09-17-2015, 02:02 PM
  #5  
Registered
 
Join Date: Jun 2011
Location: Sunny Florida
Posts: 129
Likes: 0
Received 0 Likes on 0 Posts
Default

Originally Posted by Superman09
Looking for a relatively simple EFI swap (if possible) on my set-up.

My #1 question to figure out however if if my camshaft is mechanical and will work with EFI anyway. It is a Crane #268761.
The engine is 505ci with eagle rotating assembly, Merlin Intake, Camshaft noted above, Dart Pro 1 heads, Quick Fuel Carb, Lightning Headers. Makes 610hp/613tq.

Not doing this for a power increase really, just to get rid of the carb and go to EFI for simplicity, turn key and go, etc plus I am not very familiar with carburetor set-ups so when it comes to tweaking them I am just not familiar.

I have seen the FAST EZ EFI, I also see FAST offers a Marine EFI. I know Holley offers the HP system, etc.

With this, if my cam is compatible, my other question would be what to do for the O2 sensors with the lightning header exhaust, surely we can't get the sensors wet.

Thanks for the help as well as recommendations, will be my Winter project!
You really are not going to get much "simpler" than a carburetor. Fuel injection is a tad pricey and has more things that can break (ie: sensors). It will be turn-key and go, after someone tunes it. Aftermarket exhaust manufacturers can modify their risers to allow an O2 sensor if you really have your heart set on this. And there are adaptor plates that go between stock manifolds and risers as well.

Enjoy.
Br1dgemann is offline  
Old 09-17-2015, 04:23 PM
  #6  
Registered
 
Join Date: Nov 2005
Location: Fredericksburg, Va
Posts: 4,554
Likes: 0
Received 2 Likes on 2 Posts
Default

1st EFI and simplicity should be in same sentence, my .02...ran both..Haxby marine on here will be the best to set you up..but if you are not up to some laptop tuning to get dialed in stay with your carb. Also going to need to add a wideband 02 to get EFI to work, and not a bad idea to use one to fine tune your carb...after do so might find your carb setup pretty simple afterall !!
ezstriper is offline  
Old 09-17-2015, 04:28 PM
  #7  
SB
Registered
iTrader: (1)
 
Join Date: Nov 2004
Location: On A Dirt Floor
Posts: 13,514
Received 3,086 Likes on 1,388 Posts
Default

Originally Posted by Superman09
Looking for a relatively simple EFI swap (if possible) on my set-up.

My #1 question to figure out however if if my camshaft is mechanical and will work with EFI anyway. It is a Crane #268761.
I did not look up your cam, you can do that, but a mechanical cam is fine with EFI's if they don't have a knock sensor. If they have knock sensors, than you would have more homework to do.
SB is offline  
Old 09-17-2015, 05:23 PM
  #8  
Registered
iTrader: (1)
 
Join Date: Oct 2013
Location: SF Bay Area
Posts: 2,885
Received 142 Likes on 94 Posts
Default

I'm a huge fan of EFI, but I'm glad that I went with a carb on my boat. Today's carbs are light years ahead of the old quadrajets that I had to deal with as a kid, and the corrosion issues on a boat make me keep it as simple as possible.
Baja Rooster is offline  
Old 09-17-2015, 10:19 PM
  #9  
Registered
 
Join Date: Mar 2009
Location: Beaverton Or
Posts: 386
Likes: 0
Received 0 Likes on 0 Posts
Default

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.

Last edited by Pliant; 09-17-2015 at 10:26 PM.
Pliant is offline  
Old 09-18-2015, 06:47 AM
  #10  
Platinum Member
Platinum Member
 
MER Performance's Avatar
 
Join Date: Jul 2008
Location: Little River SC
Posts: 931
Likes: 0
Received 0 Likes on 0 Posts
Default

I have done several of the Holley HP systems..... Haxby, was the most influential role in guiding me through the first, tune... Mostly the navigation of the software, if you know how to tune a carburetor and map out timing curves, you'll find a EFI the most tunable.. Some things are just not possible with a carburetor and a basic timing curve, your only other option on timing is use the Daytona CD-1 Marine, you can Map it as a EFI, the software is just a little primitive in comparison to any EFI.
Let Me be perfectly clear; just installing the EFI and running it in closed loop, isn't tuning for power... You need to do it on a dyno and have your base MAP, that way you can adjust fuel and timing for performance, then you can move that into the boat adjust from there, this will be done in closed-loop-learn..
You may have to adjust low speeds and idle, shifting into gear from your laptop into those cells which need adjusted. That isn't always determined by A/F numbers, it's by experience and what the engine wants or doesn't want.

I'm currently, building 2 525 EFIs different cams, modified TB and upper intake plenums, these are also being converted over to the Holley HP...Different heads, would have been great, but not in budget, so let's see what the stock 525s will do with port matching and a bowl blend, with a better valve job... Marine Kinetics, my dear friend Bob, put together the valve train for me as usual, expecting good results from the cam profiles. These packages are 6000 rpm, will see if there's anything left in the heads with those 3/8 valve stems......LoL

I hope; I helped with your question..... didn't mean to just wanted to share
MER Performance is offline  

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

Copyright © 2024 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.