Carb to EFI swap on 525sc??
07-01-2018 | 10:45 AM
#1
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Joined: Jun 2003
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From: Pittsburgh
Carb to EFI swap on 525sc??
Sorry if this is in the wrong section. Just wondering if anybody has ever swapped out the carbs on a 525SC for an EFI unit? I have one carb that is dumping fuel at lower RPMs and hoping a simple cleaning with minor adjustments will fix the issue vs a rebuild. So I am naturally wondering if a switch to fuel injection would be possible.
07-01-2018 | 06:40 PM
#2
Neno the mind boggler
Joined: Sep 2001
Posts: 13,080
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From: toledo oh
gonna be watching this one 
i often thought one of the FI-Tech or FAST systems would be a cool fit on that engine (provided its possible)
i often thought one of the FI-Tech or FAST systems would be a cool fit on that engine (provided its possible)
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Throttles- Cleveland Construction 377 Talon
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10 OPA Class 1 National Champion ( happy now Ed! )
Throttles- Cleveland Construction 377 Talon
08 OPA Class 1 National Champion
08 Class 1 Geico Triple Crown Champion
08 OPA High Points Champion
10 OPA Class 1 National Champion ( happy now Ed! )
07-02-2018 | 01:36 PM
#5
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Joined: Nov 2004
Posts: 14,068
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From: On A Dirt Floor
1st carburetor my wife (early on while we where dating) learned how to rebuild was a Factory Merc Dom from a 525SC. I did one while she followed along on the other,
True story,
Holley's are the easiest thing to rebuild out of all carbs and fuel injection,
True story,
Holley's are the easiest thing to rebuild out of all carbs and fuel injection,
Last edited by SB; 07-02-2018 at 08:41 PM.
07-02-2018 | 10:06 PM
#7
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Joined: Aug 2014
Posts: 1,025
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From: Ohio
Would think for he money you could change out power valves to 2.5 or 3.5 and take care of the idle loading up issue and save yourself a few thousand and have less stuff to break. That being said I love efi, but there comes a time when you are throwing good money at bad.
07-02-2018 | 10:46 PM
#8
Charter Member # 55
Joined: Oct 2000
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From: Omaha/LOTO
I've never heard of anybody doing it. It sounds like you've got a bad powervalve or needle and seat assembly.
Other than having to let it idle at 1000rpms for 1-2 mins on a cold start, mine idled and ran like an EFI.
Bump your neutral idle speed to about 800 rpms and play with the idle screws.
Other than having to let it idle at 1000rpms for 1-2 mins on a cold start, mine idled and ran like an EFI.
Bump your neutral idle speed to about 800 rpms and play with the idle screws.
07-03-2018 | 06:49 AM
#9
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Joined: Jul 2017
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From: Sodus MI
holley just released a new EFI setup for supercharged applications....they don't have it set up to run dual throttle bodies yet which is why I haven't considered it...however in a single carb application like yours it looks to be the most reliable and inexpensive by far...you do need a dry section of exhaust however to run the O2 sensor....but it is self tuning and looks like a breeze to setup...haven't seen one but have seen automotive holley efi add ons and if it were me that would be my choice hands down
07-03-2018 | 08:30 AM
#10
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Joined: May 2001
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From: Worldwide
Hey Jason, Mark Rinda at MER in Myrtle Beach has done quite a few Holley setups. He would be a good one to ask.
https://www.facebook.com/pages/MER-Performance-Marine
https://www.facebook.com/pages/MER-Performance-Marine
