Is the mph correct for specs??
 

I have a 1999 baja outlaw 25' with a 454 mag MPI.
It has all new fuel pump, new injectors and complete new tune up.
I feel like the boat should be faster than it is, I have a 20 pitch prop on it and it comes out of water decent with trim tabs down but tops out at 56-58mph on gps with tabs up and trimmed up good with 5 people and a half a tank of fuel... The rpm is 4600... Nothing sounds wrong or anything I just expected more MPH out of it. I had a 23 pitch mirage but that resulted in a total fail! Would not hardly even plain out, labored the motor hard and it would only turn 4200 rpm at 52mph trimmed ALL THE WAY UP. So I'm looking for advice and or clarification. Maybe that's all this boat should run??

I was going to check the timing but I started to read up on it that you can't just throw a light on it and check it that way because of the computer will compensate??

Last resort will be forced induction but I'd like to save that subject of discussion for later after some input on this.
Thanks

try a 21 on it. on my 272 with a 330hp carbed and a 21 mirage its ran 53 at about 4600-4800

I'm getting 58 out of a 20 pitch right now. I'm wanting 65mph with a good holeshot still

You also had 5 people and 40gal of fuel... Put a 21 on it run with just you and a buddy light on fuel. Get a chop under the boat and watch your trim. Low 60's should be there and that's where you will be with that boat. Maybe 65-67 with a brand new motor and just you in the boat.

Motor only has 268 hours on it, Would a 21 be too much with 4-6 people? Because I don't just go out with one person often and no fuel for a speed run, I want to be able to run it with good amount of fuel and full boat.

You’re not going to gain 7+mph without engine modifications. You might get to 60mph with a labbed prop and a full load. Talk to BBlades.

Speed is only a question of money. How fast do you want to go?
:drink:

Looking into the pro charger M-1 kit, says I should gain some good numbers on mph and safe at 5psi on a stock motor. If it'll get me 75 I'd be happy. It claims up to 81mph so we will see I guess

Remember then you need hydraulic steering, upgraded tabs, and a stronger outdrive.

My outlaw already has hydraulic steering, K plane hydraulic trim tabs and a bravo one out drive. All is good there

Your mostly safe then, but an XR or better outdrive will prevent drive failures. Seatow comes in handy with a single blower engine.

I heard the bravo one is good to 700hp

At 700HP for about 10 seconds. Even an XR isn't designed for that. If you baby it, then it might last a little while.

So in a word
No

Well none the less at 5PSI it should only be around 615-660 CRANK hp
So I'd say 600 or less at prob

FYI it will be more than just bolting this on. The proper way is new lines form the tank, areomotive fuel system with boost referenced regulator, uopgraded oil cooler, cooler thermo and a custom ECU burn. I have a friend with the 7.4l mpi and procharger, it has all of the above and went many years with no issues. Last year it got warm and pretty much trashed all the internals, he did a full rebuild using forged parts vs. the cast stock. Things go bad fast under boost when something goes wrong, even faster with cast internals. You will have only a few seconds if you drop fuel pressure or get hot.

IMO. Buy a ready to drop in N/A engine that has the HP you want, take your's out and store it in the garage for resale time. Less headaches and most likely the same amount of money as the mods you are trying to do, and when you are done playing you should re-coup most of your money by putting the boat back to stock and selling the HP engine your bought for market value.

You should have no problem finding a fully dressed engine that will get you your speed wish for about $10k, drop it in and go :)

You can run it until it breaks. I had 550HP on a bravo one and it lasted 2 months. If you’re gentle it could last a while.

BTW he is correct about the setup. I just mentioned the safety concerns. Keeping the engine together is a whole new ball game.

If you like turn key leave it alone.

It's supposed to be turn key now and I have worked on it since day one but that's my own fault I got suckered into a bad buy, i just put a brand new cool fuel pump, regulator and vapor lock system on it and brand new injectors. I don't have a problem with doing it right but I also like a blown application. My truck is turbo, my car had a whipple now has an F-1X, I just like boost. But I want to do it right and don't have a probl starting mild on the boost till winter and build a larger cubed forged internal setup and better drive. I plan on keepin the boat for quite awhile I don't see needing any bigger as I have to launch with just me and the wife generally anything bigger will get to be a pain alone

I understand the love of boost, I have supercharged engines. However, there is nothing harder on a drive than a super charger! :) One thing that is not often talked about is the increase in tq across the board with the supercharger, most just talk HP. I baby mine out of the hole, and rarely see boost until I hit 70 mph to try to make my XR's last longer.

A single bravo on a 5000lb boat with a super charger doesn't really have much of a chance at life. The good news is bravos are relatively cheap, so you can keep a spare.

I still thing the swap with a proven engine is the way to go, will save you time, money and headaches, and you will have resale. Looking around even here in the classifieds, someone is selling take out 496ho closed cooled whippled engines for $7k each. Still a cast engine, but at least it is drop in and your stock engine is sitting home safe in the barn.

What kind of drive would I need and what would it run $$$ wise?
What could I likely see out of selling my motor and drive with 268 hours on it?

XR is the most cost effective at about $7500
if your beat it, it will eventually break.
There is better but the $$ goes up fast.

Your setup, Depending on the buyer. my guess 4-8K

You guys are talkin me right out of doing anything to this boat... Sucks but I don't want it to be a million dollar deal. Which I know doesn't make sense when referring to a BOAT

Can't compare boats to cars. I can buy two nice cars for my single engine's cost alone. This is the sport of kings. :poopoo:

Oh I know, I sold one of the race cars for this boat

IMO- buy a boat that was engineered to go the speed that you want. Want a 80 mph boat, buy a stock one and leave it that way :) I spent nearly $40k trying to make a boat faster, and countless hours of learning things the hard way. If it's part of the hobby for you fine, but if boating is your real hobby don't push the limits of your set up or working on your boat will be your new hobby. Keep in mind many of the gear heads that hang out on here own large buildings with hoists, engine builders within reach, tons of knowledge, spare parts and other gear heads to help :D

The 25OL is a good boat, I think it has great room for the size. That engine (7.4mpi) is a cast TRUCK engine, and was never designed to be a high performance engine. I am more worried about your engine than your drive.

A blue merc 500hp will get you a reliable 68-70mph on that hull, and the drive will stand up if you are easy on it. Those engines (carb with gill exhaust) can be had used with all the accessories for $10k or less, or find an EFI 500 hp with CMI headers for about $15k. sell your old one for $3000k. The blue engine will aslo increase the value of your boat, will drop right in, a supercharged 7.4lmpi will most likely de-value your boat. With the blue you now will have an engine you can run WOT all day if you like :D

Even if your procharger can be had for $5k, I'll bet you the farm you will be at $10k when you are done, and you will always being looking over your shoulder and at your gauges.

Sounds like some really good and wise advice, I think I'll start looking at motors and at boats... If I could make a setup come together I'd keep the baja but like you said I need a good motor and drive to match

:D Forgot to say that my 40k investment in my old boat never paid off, my new one is stock and 10 mph faster out of the box.....it will stay that way.........I think

500hp with a bravo1 is a good set up for your boat.

[QUOTE=4bus;3736889]IMO- I spent nearly $40k trying to make a boat faster, and countless hours of learning things the hard way. If it's part of the hobby for you fine, but if boating is your real hobby don't push the limits of your set up or working on your boat will be your new hobby. QUOTE]

Amen!
If I only spent that little to get to 100 I'd be ecstatic. On my way home to fix the half dozen problems from a weekend of racing. Yes fixing it is my hobby now… Still fun!

Looking at a 500 with pro charger and looking at xr drive

A good friend has a Checkmate 253 with a procharged 502. Dynoed at 713 hp so I would guess about 675hp in the boat. The boat has seen 82 and some change with a little more left in it.

Just mentioning it as I would assume the Outlaw is similar in size and weight.

He just grenaded his drive(stock Bravo) a couple weeks ago and that was after 3 seasons. Not sure how many were on it before he bought the boat.

Nice thing about the Procharger is it doesn't make boost until higher rpms so low rpm you have close to the same hp and torque as a stocker. But, it has to be done right and that costs $$$.

Before you jump to a supercharger lets back this whole train wreck up to the station, first off there is somethiing rotten in Denmark here, your have OTHER problems. Most 25 outlaws run about 62 or so with 454 mags with 23 pitch 3 blades at 5100 or so and have 1.50 outdrive gears.
When I run your numbers thru the online caculator they do NOT compute, a 20 pitch prop at 58 mph and 4600 rpm computes at ZERO slip, boats like yours run 15-20% slip. Has this boat EVER ran right while you had it? My guess is someone put a drive on with 1.36 gears and you are so far out of the powerband your boat is a slug and has no speed, it should be all over the rev limiter with a 20 pitch prop on it. Post more info and we'll go from there.
IF your speed, rpms' and prop are truly correct ( 58 mph/4600/20 pitch) we have found your problem, Smitty
http://www.rbbi.com/folders/prop/propcalc.htm

I tried to run a mirage 23 pitch 3 blade yesterday and it took the trim fully up to get the motor to get to 4200 rpm and would only run 52mph... How can I determine the drive and what are you thinking the problem is?

The 58mph@4600 rpm is correct with a power tech 20 pitch

check your timing. mebbe you don't wanna adjust cuz computer will just compensate, but see what idle is and see what 3500 with the advance all way in is timed at. sounds like it is too retarded. the timing, i mean...you might want to take off sun pad-hatch and have a buddy run it up on plane while watching timing advance. the computer might advance differently with no load on engine at higher rpms on the hose in the driveway.

Idles perfect at 600-650 rpm. How can I check timing without the scan tool to set in service mode?

I'm sorry Martin, most of my posts were based on me thinking you had a 7.4l mpi, which is the 330 hp cast internal engine. You can build up what you have fair easy, my bad :/

So if you are going 58 mph with a 20 pitch at 4600 your slip would be ZERO (impossible) or you have a 1.36 ratio drive (or even taller). You might have other problems but the DRIVE RATIO is your main problem. You need like a 18 or 16 pitch prop to get your speed and rpm's right but that doesn't really exist in a stainless bravo prop so what you really need is to change outdrive gearing to 1.50. Your only running 4600 with a 20 pitch, your motor peaks at 5100-5200 so you are probably about 40 hp or so BELOW the peak , until you resolve this you will chase your tail, Smitty
I would buy the right drive gears or a diffrent drive.

He's turning 4600 with a 20 pitch though, if you crunch the numbers he must have a 1.36 ratio drive and boat is still propped too tall, needs correct gears before he changes alot!\
http://www.rbbi.com/folders/prop/propcalc.htm

Then something is not right. It should run at least 60mph at 4800rpms+.

Why not just buy a 40k boat that is worth 40k instead of spending 15k on 25k boat that will still be worth 25k when you're done.

Griff, if you crunch his numbers (58 mph with 20 pitch at 4600) it comes up as ZERO slip with 1.50 gears, boat wont pull a 23 except to 4200, only turns a 20 to 4600 BUT most the speed is there), I strongly feel he has a set of 1.36 or taller gears in hbis drive, he will NEVER get it to run right until that is taken care of, Smitty

agreed....my 270 laser ran 61-62 with the 454/385 , bravo 1.5 and a 21P mirage...4900/4950....before i added the whippled engine !

Yea it's a 454 mag MPI 385 hp