upgrade 502 to 525 fuel sys
 

Hi ,

I onw the Sea ray P 22 with 502 Merc on it , it's 2010 model.
It would be nice to have a bit more power than stuck 380 hp.
I found 525 intake and ECM sys as it shows .Can I put this in to my 502 with cam.?[IMG]http://www.iv.pl/images/71300433751949265058.jpg[/IMG]

And this is my baby :)
http://www.iv.pl/images/38312031368579532231.jpg

That's a pretty nice motor. Are you sure you want to start hacking it up? Plus, doesn't have the cat converter on it? Not sure if that would work with the 525 stuff.

You might be better off selling that motor complete and buying something else.

The engine is catalyst so can't get to any mods.so far as I've been told...What else can do ?Don't see any other solutions...

8.2 mag is 430 hp...stilll under warr?? procharger will do a much better job...

8.2 mag H. O. is 430 my is 380 hp here my friends Cobalt A25 with it:http://www.iv.pl/images/90595657922786547052.jpg

and the only diffrence is ECM ...as I know so far ,both have dts so what if I swap the ECM's ?

Boats are not honda's. You shouldn't approach this hobby thinking you can swap around engine parts and see any appreciable speed gains.

Changing the fuel system isn't going to do anything other than cause problems. None of this is just bolt on and go.

You can almost argue that a blower is "bolt and go" but then he would still have to deal with re-propping and hydraulic steering. Oh, and fixing his B1 after it eats itself.

Do an upgrade kit exist
for these new engines?
Or simple quastion, does anyone tweak 502 yet ?

What is your goal? A 22' pachanga is not a bad beginners powerboat by any means, but you need a clear goal in mind rather than just "adding more power".

also keep in mind that your engine is a fly by wire set up so the blue intake will need nmore hardware then you think..

Call Dustin at Whipple. He may be working on or can give advise on upgrading your motor.

http://www.whipplesuperchargers.com/...7&DisplayCat=1

Blowers are by no means bolt and go........unless you only want to go for a very short time.

To my knowledge, nobody has done any mods for the new 502 engines. I doubt there are more than a couple hundred that have even been produced and most are still under warranty. By the time you are done spending money on any mods that would give any real gains, you would be better off selling it and upgrading to a 525efi. Whipple is probably the only one that can even reprogram the PCM. To get the tune right, it would need to be done on the dyno and then should be done in the boat also with a AFR's.

My goal is limited by drive ,which is bravo III x ratio 2.0 with 28 pitch.Mercury manufacture bravo III up to 525 hp ,that's what I look for...
And thanks for any advice to all.
First thing on monday I will do is give a call to Wipple, i'm pretty sure Dustin figured out somthing :)

I think what's being said here is:

With all due respect, you have the wrong boat, engine and drive to be considering performance tweaks. You'd be far better off pocketing the money that you would spend, avoiding the headaches, and moving up to a proper single-engine performance package when time permits.

We're not being rude or uncooperative; we're just passing on our experience....

Modify!
 

That really depends on the individual. I took a 20ft searay, completely gutted it to a shell, installed a new stringer/bulkhead grid, built my own deck, rigged it out and bolted on a 2.5 merc offshore. I raced this boat for two years against progressions, activators, superboats, ringcrafts, marshans and phantoms and blew them away for two straight years.

I bought a 50cc scooter for a pit bike. It now runs 72MPH. Could of bought a 150cc but just like the sea ray, where's the fun in that. He may be like me and prefers to build his own weapons.

is this like your boat??
 

if it is then i would ditch the drive and find a standard 150 bravo one with a -2'' incl shorty and go from their..that drive is good for alot of people on the boat and most boats i have seen in your size is limited to about 60 mph..standard bravo with a shorty will be faster..[YOUTUBE]http://www.youtube.com/watch?v=ucl7P3WbVnw[/YOUTUBE]

Yeap this is the boat i have.My run close to 70 mph.

fixx
 

if you can figure out what your upper gear ratio is you may be able to get away with just a imco lower..

ratio is 2.0 as far as i remember , what does that mine...?
Which one would work for me ,there's many imco ...
Sound's like a plan :)

fixx
 

2.0 means that the input shaft of the drive turns 2 revolutions to the props 1 revolution..

first you will need to draw a line center of the inside prop shaft on your drive thats on the boat now..lower the drive so its even with the back of the boat and see how many inches it is below the bottom of the boat...

-2 is a common lower to go with..keep in mind you will need a 4 blade prop and the boat will handle different then your use to..it will be allot looser..

http://www.imcomarine.com/cal_store/

At that speed a Bravo I would likely net you the same thing as 30-50 extra horsepower...2-3mph tops, but then you would lose all the advantages you get with a Bravo III, I say leave it alone. For reference a similarly sized boat, by brother had a 454 232 Formula Bravo III and put a Bravo I on to try it out, he wend from about 61.xx to just under 63mph (less than 2mph) once he found the right prop. He changed it back since the B3 was so nice around the docks etc. Obviously the faster you go, the more it slows you down.

If there is an easy way to go from your motor to the HO and do the drive it may be worth it (similar to the cam and ECU tune on a 496 standard to HO), but I sure wouldn't go hacking into something that pretty. And I don't know anything about these things, but I would think somebody would know the difference here.

EDIT: I see you are talking shorty lower, that will obviously be worth more than just a standard bravo.