pro charge a 7.4 efi?
 

First off, let me say hello. I am new here.
My question is, does anyone on here have any advice or experience with adding a pro charger to a 7.4 efi or maybe it's a mpi, I don't remember, 310hp. It is in a 99 212 Islander. Stock. I am currently running at about 60mph non gps. I really want to go faster. I have about 180hrs. Any comments please. Thx

Buy a bigger/better engine. Some will tell you that you can "get away" with the Procharger on a 7.4 motor, but they are just trying to sell you a supercharger.
The 7.4 motors have cast internals & cast internals don't like high cylinder pressures.
Your best bet is to sell the 7.4 motor & re-power with a 502 MPI or a 496 Mag HO.
Personally, I'd look for a nice 540 in the 600 hp range as long as you have a bravo one drive. You'll get better performance with that plant & you sure will go alot faster! Probably too fast!
Ofcourse I always have believed excess is barely enough. Praticality wise, I'd opt for a 496 Mag HO. That will put you at 425 horsepower & you'll probably see about a 10 mph gain, if not more.

Find a takeout 502 MPI, or a 406 Mag HO complete.

Then you still have your engine to sell to recoup some of the costs.

Probably end up cheaper, plus much more relaible.

You will also need hyd steering to go to much faster in a 21 footer

212 speed problem
 

Hello,
First off you may want to make sure your getting the most out of your prop. That boat should run about 65 stock. If you really want to go fast and stay reliable I would drop in the bigger engine. I have a 502 carb in a 232 Islander, currentlly going 76 on the speedo.

GPS 76 or Baja speedometer 76? How many horse?

Well when I bought the boat it had a 21p mirage on it. I was hitting and 4800rpm and doing about 58-59 non-gps. I did some research and found out it came stock with a 23p mirage. So I got that prop this season. now I have not been able to really do a wot run yet. I usually have a full boat with 8 people and all the gear and beer. But over Memorial Weekend I got the boat to 59 with 8 people and all the gear on the 23p. took forever to plane thou. Two weekends ago I got some bad gas and ran like crap, then lost the impeller. I agree I should be able to hit 65ish.

How much do you think i could get a take out 496 ho or a 502 mag for? how much do you think I could get for my 7.4? thanks for the help.

502 $7000ish and $3000ish for you 7.4, these are pretty rough estimates though.

Now do you think the motor will be complete or will i need to install a fuel system or will mine work?

it will be complete, in fact, PM "OFFTHEFRONT" here on OSO, he did have one for sale.

Not to sound mean, but you would be better off trading into a boat with the 502 or 500hp.The bad thing about boats is you'll spend way more on them than you'll ever get out of them. They say that's half the fun but I say bullsh*t!!

I agree with kenny but didn't want to say it! It will never end, first the engine upgrade, then you need steering and larger props, etc. By that time you still want more speed and you never get all of your money back out of it. just my .02 anyway.

I agree with getting a bigger boat. I have been looking for next season, but I am just looking at all the options. My issues are I want a bigger boat to hold more people as we party a lot and the bigger the group the better. But I also want to go faster. Plus to complicate things more we all like to wakeboard, wakesurf and so on. I really like the Nordic heat and Rage, the Magic deck boats. I just have a real hard time spending $100,000 on a boat. And a wkaeboarding boat, while it will hold all the people I want, they are not built for speed at all.

8 people & did practically 60 w/ 310hp? not sure how thats possible & not sure who would want to be in the bow doin 60.

Well the girls were in the front drinking. I didn't think it would be even close, but the water was smooth and the temp was in the 90's a lot cooler than the 115 2 weeks ago, and the water temp was cooler thean now. It was trimmed hard, big rooster tail. 4500rpm. When the water was rough ran with the tabs down and about 30-35 maybe, but it did hit 59, and on top of that the bimini was up!

What you need is one of those 8 people to get off their ass and buy a wakeboat and you go buy a nice used Rage. Everybody wins!

I have been saying the same thing for a year to my friends. they are all broke a$$e$. Maybe I need to find new friends with money. A rage with a pro charger, now that sounds fun.

I only hang out with people that make twice as much as i do. Cuts down on the riff raff drinking your beer!

415hp with land and sea stern jack 76mph on speedo.
probably 72-73 gps

That seems awful slow for that boat. My 94 208 Islander came with a 454 300 HP and a 23 Mirage and did 72 with 2 people and a light load when new. I just re-powered to a new 454 Mag but I don't know how fast it goes now as it isn't broken in yet so holding off on opening it up, but hoping to go faster than 72. I would think your boat would go faster than 60. I think my 208 weighed 3700 lbs - is this similar to yours? I just paid $4K for a new 454 mag long block plus another $500 for a aluminum hi-rise manifold and Holley 750 marine carb. This is probably a lot less than getting a bigger boat. And if I got a bigger boat I would have to get way more horsepower to get it going faster. Or am I wrong?

You need a GPS.

A GPS wouldn't be a good investment if it meant that I was reading a slower, but more accurate, speed. But the main point of my post is that to get a bigger boat going faster you are going to need a whole lot more engine.

I have M1 procharged on stock 330 454 with no proplems, I think its a matter on how you drive your boat. I had Nickersons performance do my carb. Told me I need to get rid of the stock heads before I lose a valve. It went 66 stock and 74 on the prochager. I chanaged heads and my bottom end looked great put did a total rebuilt with je pistons, bigger cam ect ect. Best speed last season was 83.6 gps on 28 labbed prop at 6000 rpms.

THat's smokin' on a 454 and a M1. What size boat?

We have a 208 inlander and have hyd steering on the boat. I have tried 32 bravo one this year best I turn was 68gps at 4000rpm. My intercooler had a hole and found a cut in the boost gauge. Yesterday I tried to see if I could turn the 32 when my buddy took off but the wife wouldn't let me. Yes it chime walks but on the right day you can steer thru it. Back to the forum. I have a stock Bravo 1 and never had proplem ,procharger hit the drive on in the upper rpms. i would say Whpple is a great blower put they hit the drive a lot better in lower rpms put again harder on the drive.

That would scare the sh*t out of me in a 21' boat. I feel your pain on the wife thing, They're worse than a 2500 rpm rev limiter!

Did you keep the stock crank and rods? What heads and head gaskets?

Steel crank, gen 5 motor, stock rod stress releived ,arp rod bolts,je pistons and rings, crane cam, crane gold rockers custom pushrods, hp500 rec port hads. ported polished, merlin intake, msd dist and box, gil exhaust fel pro marine gaskets,aeromotive fuel systems, 5 pounds boost.

i have scarab 22 with hp465, with some mods. i put drew marine sidewinders on it and no more chine walk at all. i can run 79 on gps with a labbed 27 mirage plus

I'm new here also. I bought a 320es this summer with two gen v 7.4 and prochargers. the engines were freshened and have ten hour on them since the prochargers were installed . I don't trust the stock internals with the blowers. I'm hoping to get a couple years out of them, in the mean time I'll be looking for a pair of blocks to build some real power. I haven't even put it in the water season is over for now. looking forward to putting it in next year. Prop calculators say I should see 72 with 28 pitch. Engines say they have a rev limit of 4600. Anyone know how fast I can spin them w/o tearing them up?

Just FYI
 

I agree with buying a better engine.... However, I am currently running 26' with 7.4 mpi bone stock with m1-sc bought off e-bay. Used to run 55mph with 24p bravo at 4500 rpm, now does 67mph (on hand held GPS) with bravo 26 at 4400 and quite honestly I have not taken the time to tune it properly (waiting for the rebuild)

My point is that I went for the quick cheap HP and now have nearly 90 supercharged hours on a seven year old engine that is smooth and reliable... I don't spend all day in the boost end of the rpm, but its there when I wanna pass someone.

** All things considered I would not have chosen this route if I had not gotten a screaming deal on the procharger. I don't think you can sell the 7.4 for much and in Arizona (I'm located in Mesa) You'll have to be damn lucky to find a turnkey 502 or 496 for $7k unless it's shady..

i have pro charge it bad ass m4 1400 hp 24 outlaw 100 plus