Add HP to a 2003 Mercury 225hp EFI?

[Z21 Tom]

I'm thinking of adding HP to a 2003 225hp EFI. Is it easy to make the 225 a 250hp?
I'm just curious. Don't want to swap the engines if I can add an ECU or some performance upgrades.
Thanks for any info.

[JOE54]

the only thing that mtr needs is good set reeds and higher rev limit and some stickers, those are very strong 225 engines,what boat is it on

[trivialpursuits]

the only thing that mtr needs is good set reeds and higher rev limit and some stickers, those are very strong 225 engines,what boat is it on

Who is able to raise the rev limit on these later 555 style PCMs?

[EuropeanAM]

Probably Nobody... as it's illegal and a violation of certain intellectual property rights (copyright).

Agree that reeds are a good idea.

[Z21 Tom]

It's on a 03 Ranger 521VS

the only thing that mtr needs is good set reeds and higher rev limit and some stickers, those are very strong 225 engines,what boat is it on

[bass.man65]

It's on a 03 Ranger 521VS

What speeds are you getting with the 225 EFI? The best thing you could do is sell the EFI and buy a 250 Pro XS. Market is flooded with Pro xs 250's now.

[rchavis]

Mercury 225 EFI / 250 EFI ....2003 yr time frame .
Are these two engine blocks the same . Just the PCM or different , which make the extract HP ?

[Collin C.]

Who is able to raise the rev limit on these later 555 style PCMs?

Eric Simon flashed my 555 to raise the rev limiter on my 03 250efi, it was about 18 months ago. I think they have since stopped due to Merc mandates. I have used him 2 other times On an 250Xb and a 98 225efi with no issues.

[rchavis]

What gains , did you get with the raise rev limiter on your 250 EFI . Don't want to rob his post . could you send in PM .
thx

[JOE54]

Mercury 225 EFI / 250 EFI ....2003 yr time frame .
Are these two engine blocks the same . Just the PCM or different , which make the extract HP ?

MERC shows diff p/n for blocks / sleeve part numbers are the same in a sleeve chart, cyl heads are the same , reed blocks are the same

[EuropeanAM]

If you would, please take a moment to review the Announcements at the top of the Forum, and provide the Required Info (serial number) with your post. Thanks!