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08-21-2018, 10:22 AM #1Member
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2002 Mercury 225 EFI performance mods
What are some ideas and or combinations of parts to make this dog run like it's supposed to or better? XB heads? ProMax heads? ECMs? Reeds? What has worked for some of you guys?
Tony
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08-21-2018, 02:58 PM #26000 RPM
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Just got through doing this on my 225 carb motor.
4 butterfly intake, 250 efi fuel and 300 ign ECUs, Chris Carsons reeds.
If you want to cut the tuner go for it.
That will wake her up.
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08-21-2018, 03:31 PM #3Member
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08-21-2018, 05:04 PM #46000 RPM
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Nevermind. You have the 555 ecm. Whole different game.
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08-22-2018, 05:57 AM #5Member
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So with the 555 ECM what do I need to do to squeeze some hp out of this thing. I know it needs more compression so I'm looking for suggestions as to what casting numbers to search for. And what ECM ro search for as well. I dont intend to do any tuner modifying although I would consider replacing with a 300 tuner. From what I've read on here the hot setup for previous years to mine was 300 ProMax ignition and 250 XB fuel ECMs but mine being a later model wont use the same ECMs.
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08-22-2018, 10:50 AM #65000 RPM
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I also have a 2002 225 EFI, trying to figure out what to do with this guy. I only see one ECM on mine as well. If you figure out what you're gonna do with yours let me know. Would love to compare notes.
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08-22-2018, 10:58 AM #7Member
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I certainly will. Surely one or two of the knowledgeable gents on here will offer some insight
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08-22-2018, 10:05 PM #85000 RPM
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If you have the one box or ECM you most likely have a down draft engine and the ECM has to be sent off and have flashed and have your heads cut . The 300X will hurt your bottom end or hole shot and be louder. Thats what i was told . I have a 2004 225 EFI with the one box and it is the down draft engine .
If any one want to mod there tuner or a mod tuner , i have one i would let go .That came out of my 300X Mid-section . it has been cut off about 6 inch , from the best i can remember . Going back stock .
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08-22-2018, 10:30 PM #95000 RPM
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08-22-2018, 11:08 PM #10
http://www.simonmotorsports.com/popp...tinstall2.html
Directions in where to cut tuner and installation of poppet diverter
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08-23-2018, 05:36 AM #11Member
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08-23-2018, 02:03 PM #125000 RPM
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No to get gains out of these motor's ...the ECM controll every thing .....so the box has to be flashed to get more gas and rpm range . And the heads cut to make up for the gain's. There are more like the Optimax motor 's. Thats how it was explain to me . then mods to the tuner to exhaust more ?
I do know on the 300X they have a 1 inch hole in the bottom of the tuner and after market are cut to get gains .
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08-23-2018, 02:48 PM #135000 RPM
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Is it feasible to stage and upgrade out?
EG
Get the computer re flashed then get the heads cut etc...
or is this a build it and flash it to the build type thing.
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08-23-2018, 03:03 PM #145000 RPM
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If I was talking about something mild eg... turning the 225 into a 250... I am looking up part numbers is the only thing different between these two the computer? I can't see any difference in part numbers between the same year 225 efi and 250 efi when it comes to pistons, cranks, Injectors, fuel pumps, intake manifold etc...
Last edited by strat250; 08-23-2018 at 03:06 PM.
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N/A liked this post
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08-23-2018, 03:20 PM #15
My favorite series of engines ... all the basic stuff to build 400 HP
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HopePusher, Laseraddict liked this post
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