2002 Mercury 225 EFI performance mods

[strat250]

Hook a brotha up!!! need some extra ponies on the back to spin this prop.... seems easier than trying to buy smaller props. haha. Got the stickers all put on and lookin shiny.

[RiChavis]

[QUOTE=strat250;3070400]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...[/QUOTE
Correct....I think the differnce is the ECU box and probably porting in the block ? they even have the late style tuner with the idle relief ports (18) of them. Ask the pro's like Chaz ,Todd ....they know these engine and the 300X like the back of there hand .

[RiChavis]

So are are you talking about the exhaust tuner in the mid section needs to be cut, as well the heads need to be shaved, then there would be gains running the modified engine? What do you have that you want to sell and how much?

I have one that's been cut like in the pic from Simmon MotorSports ....on the shelf. It came in a 300X driveshaft housing or mid -section ..it the late style tuner with the 18 idle relief ports in it . If any one wants to try a cut tuner , this way they dont have to cut there good one. If they want to go bad ? Dont want much for it ,shipping will eat most of the bill .Just PM me a price you want to pay for it ,we go from there .

[Freedom92]

My favorite series of engines ... all the basic stuff to build 400 HP

Has anyone tried to build a 3.0 to run on E-85?

[Freedom92]

My favorite series of engines ... all the basic stuff to build 400 HP

400 hp? You have my attention. My mouth is watering like Pavlov's dog.

[big tom]

My favorite series of engines ... all the basic stuff to build 400 HP

You can get 400 hp out of a 225-250 efi?. Not questioning your ability by any means, just wondering how?.

[strat250]

My 3.6 Dodge Ram pentastar can run off of e85 and it’s crap. Way worse mileage and terrible performance. Plus that much ethanol in I doubt is good for a boat motor. Not that it can’t be done I guess but for what benefit?

Has anyone tried to build a 3.0 to run on E-85?

[strat250]

So if we were to say break this down into stages... how far off would this be?
Stage 1 - ecu reflash (talked to Simon and they said 12-15 more HP)
Stage 2 - 250 HP - above plus tuner?
Stage 3 - 300 HP high compression heads plus above?

At what point would would see any benefit from lightened flywheel, porting fuel injectors, high flow pumps etc...

For the extreme 400hp what sort of mods are you talking?

There has to be a fairly easy way to squeeze 250 and 300hp out of these things given they are essentially the same.

This is of course specific to the 2002+ efi motors as they already have the downdraft I take and better tuners..

or or am I looking at this all wrong.

for me personally I would like to try to get this to 250hp with as little cash and craziness as possible and ideally retain the stock sound. Reason being I was able to run mid 70’s with a 28 pitch raker 2 prop with my evinrude 225 HO. Now I am having trouble spinning a 27 pitch tempest plus. I can only seem to squeeze out 5500 rpms and it just doesn’t have the mid range oomph or out of the hole go that the evinrude had. I know the evinrude was a 3.3 versus a 3.0 And the 225 ho is supposedly a 247hp motor.

[Freedom92]

My 3.6 Dodge Ram pentastar can run off of e85 and it’s crap. Way worse mileage and terrible performance. Plus that much ethanol in I doubt is good for a boat motor. Not that it can’t be done I guess but for what benefit?

Its crap because youre not built for it. Alcohol needs compression to make power probably in the area of 160 to 170 psi and it takes a 1/3 more fuel to reach optimal mixture. Im not sure if the mercury injectors can deliver enough fuel. But it is cheaper to almost offset the additional consumption. If youre built for it the benefits are huge.

[cali kid]

It you want real performance gains out of your motor, 300x reed assembly with pink injectors, around 150 psi compression, cut tuner, ecu reflash. Cleaning up the ports, and the flow into the tuner, open up the exhaust chest. Presto, 300 plus hp.

[XstreamVking]

Porting and exhaust flow are the keys to getting these big blocks to breath fire . Air in and out. Add gas to reach the needed air fuel ratio and you make more power. Not so easy unless you have a lot of knowledge of exactly what to cut and how much. Swapping the boxes, changing intakes and shaving the heads is the easy part...The rest you have to work for.

[Freedom92]

Porting and exhaust flow are the keys to getting these big blocks to breath fire . Air in and out. Add gas to reach the needed air fuel ratio and you make more power. Not so easy unless you have a lot of knowledge of exactly what to cut and how much. Swapping the boxes, changing intakes and shaving the heads is the easy part...The rest you have to work for.

Yeah honestly it's the easy part I'm after. I'm definitely a tinkerer but with this outboard I just want more power and keep the simple reliability. It hangs on a Bumble Bee 2100.

[cali kid]

Yeah honestly it's the easy part I'm after. I'm definitely a tinkerer but with this outboard I just want more power and keep the simple reliability. It hangs on a Bumble Bee 2100.

Till you get all of that crap out of the intake, your just waisting your time.

[Freedom92]

Till you get all of that crap out of the intake, your just waisting your time.

All what crap?

[cali kid]

All what crap?

Wires, fuel rail, injectors, ect.