2006 Merc/Tohatsu/Nissan 25 EFI convert to 30??

Babyhewie

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Nov 21, 2008
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Been running a 2006 4-stroke EFI 25 horse merc for a while which I understand is made by Tohatsu or Nissan, and would like to know if it can be converted to a 30 hp easily.

Any info would be appreciated.
 

TOHATSU GURU

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Re: 2006 Merc/Tohatsu/Nissan 25 EFI convert to 30??

About $1100.00 to convert it...I wouldn't do it.
 

Babyhewie

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Re: 2006 Merc/Tohatsu/Nissan 25 EFI convert to 30??

Ouch. Definately not worth it, even at half that cost.

Why so much? Is there a lot involved? I was thinking it'd be more of a software thing with the EFI than any mechanical parts as both the 25 & 30 are supposedly both mechanically the same motor??
 

TOHATSU GURU

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Re: 2006 Merc/Tohatsu/Nissan 25 EFI convert to 30??

Linkage, throttle body and ECM. The ECM can not be reprogrammed, hence the sticker shock.
 

kandil

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Aug 8, 2008
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Re: 2006 Merc/Tohatsu/Nissan 25 EFI convert to 30??

That is why I love my 2 stroke 25HP now 30hp:D it toke 10 minuets and zero parts
 

Wee Hooker

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Sep 11, 2005
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Re: 2006 Merc/Tohatsu/Nissan 25 EFI convert to 30??

Even at 1/3 the cost, you have to wonder if the 5hp increase is going to do anything noticable for you.
I'm ordering a new one and (while I'm likely going to do it) have trouble justifying the $400 increase to get me an extra 2-3 MPH that I probobly won't need anyway.
 

nthinhere

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May 19, 2011
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Re: 2006 Merc/Tohatsu/Nissan 25 EFI convert to 30??

About $1100.00 to convert it...I wouldn't do it.[/QUOT

This is an old post from 2008, has the price came down any to convert to a 30hp? I have a 2006 Merc 25hp 4S efi, would love to get a little more out of it... dont really want to spend all the money and added weight to power up to a 40hp... Tohatsuguru?!?
 

pvanv

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Apr 20, 2008
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Re: 2006 Merc/Tohatsu/Nissan 25 EFI convert to 30??

You would still need the very expensive ECU, so no, not cost-effective.
 

nthinhere

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Re: 2006 Merc/Tohatsu/Nissan 25 EFI convert to 30??

Cost effective, is the price of this ecu under $500 now? Is there a way to find a used ecu on eBay? It would be worth it for me to get an extra 3mph, Im a sluggish 22mph now... New motor is +3.5k plus 75lbs....
 

pvanv

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Re: 2006 Merc/Tohatsu/Nissan 25 EFI convert to 30??

3ac064013m ecu, f30b $1091.79
 

nthinhere

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May 19, 2011
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Re: 2006 Merc/Tohatsu/Nissan 25 EFI convert to 30??

What about this one on ebay, $550 OBO.... PART # 89195215S - # 891952Q15 . 30 EFI - ECM UNOPEN OME BOX. I dont know how to cross ref the numbers...
 
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