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Thread: 300 pm ecu

  1. #1
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    300 pm ecu

    I'm finishing up my 225 3.0l build and have run into a slight issue, I'm only turning 5800 rpm.

    Can anyone tell me what the rev limiter on this ECU is? I was under the assumption that it was a 6200-6400 rpm limit.

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    Could anyone mention the part # for the 6200-6400 rpm limited ECU?
    2002 Stratos 20XL w/ 1998 Mercury 225 EFI

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    Mine run around 6350 bolted to my 250xb, the 250xb ecu turned 6150

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    Quote Originally Posted by Varmint View Post
    Mine run around 6350 bolted to my 250xb, the 250xb ecu turned 6150
    What's the part number on the ECU turning 6350?
    2002 Stratos 20XL w/ 1998 Mercury 225 EFI

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    Both ECMS have to have raised limiters. If you try to use a 300PM ignition and a 225 Fuel ECM, it will flood the motor with fuel. Either use a 250XB or have a 225 fuel ECM programmed.
    "We, the unwilling, led by the unknowing, are doing the impossible for the ungrateful. We have done so much, for so long, with so little, we are now qualified to do anything with nothing."

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    Quote Originally Posted by bsumner View Post
    Both ECMS have to have raised limiters. If you try to use a 300PM ignition and a 225 Fuel ECM, it will flood the motor with fuel. Either use a 250XB or have a 225 fuel ECM programmed.
    Yeah, I have a 250XB Fuel ecu, and this ignition ecu is off a 300 PM EFI, but no matter what prop I throw on the thing it will not turn more than 5800 RPM.
    2002 Stratos 20XL w/ 1998 Mercury 225 EFI

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    P172270602 ,and it doesn't say 300 MHP ..it Says 300 Pro Max Ign. I snapped a pic on my phone,,if you give me your phone #,I will gladly text you a pic of the label. this was removed from a 98 300PM that popped #2 piston. I have the rest of the motor still here.
    Quote Originally Posted by xringmaster View Post
    what's the part number on the ecu turning 6350?
    Last edited by Varmint; 03-30-2018 at 06:01 PM.

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    early 300 promax motors had a 5800 or 5900 limiter...i remember one of mine would hit a wall at 5800ish so i just kept throwin bigger wheels at it until it stopped hitting the limiter....i have a raised limiter on my 300pm thats on my kryptonite but i dont remember how high we raised it...
    1984 28 ghost twin 200 Yamah ProVs (SOLD)
    1997 21 Superboat Legend 250 VMAXXX (SOLD)
    2001 25 Concept CC 250EFI (SOLD)
    2002 24 Superboat Step 250EFI (SOLD)
    1997 21 Checkmate Pulsare 200EFI Merc (Beater Boat)(SOLD)
    1994 20 Hydrasport 225 Optimax (SOLD)
    1998 27 progression Twin 225 Mercs (SOLD)
    2005 23 Kryptonite 300 Promax (FOR SALE)

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    I just cleaned up the clamp on my 300 for paint,I will get you the serial number,,then you know what s/n range to be looking in

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    Quote Originally Posted by Varmint View Post
    P172270602 ,and it doesn't say 300 MHP ..it Says 300 Pro Max Ign. I snapped a pic on my phone,,if you give me your phone #,I will gladly text you a pic of the label. this was removed from a 98 300PM that popped #2 piston. I have the rest of the motor still here.
    269-921-0664

    Quote Originally Posted by ghost28 View Post
    early 300 promax motors had a 5800 or 5900 limiter...i remember one of mine would hit a wall at 5800ish so i just kept throwin bigger wheels at it until it stopped hitting the limiter....i have a raised limiter on my 300pm thats on my kryptonite but i dont remember how high we raised it...
    Yeah my issue is I have a 28p prop on there now, still on the limiter and my hole shot is garbage.

    Quote Originally Posted by Varmint View Post
    I just cleaned up the clamp on my 300 for paint,I will get you the serial number,,then you know what s/n range to be looking in
    I would appreciate that!
    2002 Stratos 20XL w/ 1998 Mercury 225 EFI

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  12. #10
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    Click image for larger version. 

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    Click image for larger version. 

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  14. #12
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    Quote Originally Posted by Varmint View Post
    Click image for larger version. 

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    Yeah, that's the same part number of the one that I have, are either of them flashed?
    2002 Stratos 20XL w/ 1998 Mercury 225 EFI

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    the box part numbers are the same,look at the bottom number,totally different
    Quote Originally Posted by xringmaster View Post
    Yeah, that's the same part number of the one that I have, are either of them flashed?

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    no,the 300 box and both 250xb boxes are stock,never touched

  17. #15
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    Hey xringmaster are you boating now as in this time of year??? I could prob send you my ecu and u could try it out n ship it back...itbwill cost you shipping both ways but at least you ould know if its your ECU or not....
    1984 28 ghost twin 200 Yamah ProVs (SOLD)
    1997 21 Superboat Legend 250 VMAXXX (SOLD)
    2001 25 Concept CC 250EFI (SOLD)
    2002 24 Superboat Step 250EFI (SOLD)
    1997 21 Checkmate Pulsare 200EFI Merc (Beater Boat)(SOLD)
    1994 20 Hydrasport 225 Optimax (SOLD)
    1998 27 progression Twin 225 Mercs (SOLD)
    2005 23 Kryptonite 300 Promax (FOR SALE)

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