First dyno numbers are 488hp with the A/F WAY out of whack Couldn't pull it beyond 5300 rpm due the that. Computer has been sent back to Crockett for him to adjust the parameters that are off. We may also need to upgrade the fuel system. B-Rad is pretty sure we'll break 500 hp, but it will probably be around 5500 rpm. It looks like I'm going to have to spin her a little harder than I planned to, but she's built for it with the short stroke and all. More numbers to come on Friday!

You need to check out my fuel system. I had to upgrade as well this spring... welden racing pump and all new lines/pick up and reg. Pumps 7-8 pounds at all times. B is going to boost reference it this winter. Right now my electric comes on with the ignition and runs the mechanical as back up. 5300 and 490 is a pretty good punch up for that boat. 100 hp is nothing to sneeze at. I will spin mine at 6300 hopefully saturday.
My junk holley fuel pump lunched at 18 hours while jc and I were blasting the race course in Destin last fall, almost got run over by the popeye's race boat and had to limp in. :rolleyes: welden is the way to go if you need to upgrade.

Tell Brad to get the taint smell off his upper lip and push the sticks.. 6000 rpms minimum. :hitfan:

It sounds like you're getting close. My prediction from Desk top dyno still stands. You'll see 520±5 HP @ 5500
Are you calibrating with your wet exhaust headers or dry dyno headers?
You may want to have O2 sensor bungs welded in your CMIs so that you can recheck in the boat.

JC Perv 461
 

Jay, i had my 454 bored 30over, full hyro w/ 9.3:1 compression.

Here's my dyno from 2005.

That was/is a screaming engine Storm.
If I remember correctly, your engine had/has a little more cam, something like the Crane 741.
Also, a carb and ported high rise intake will out flow the Merc MPI intake.
Pretty good measuring stick though...

In case you've forgotten what she looked like... :D:D:D

It's got about 126 hours on it now and still runs strong. ;) Definitely has a cam in it. Not sure of the exact specs, although it'll idle around 700 rpms and isn't bad around the dock.

I believe it's a hydraulic roller setup, correct Storm?

The computer and Dyno info is back at Crockett's. He is going to look at the stuff today and make some changes. We are real fat at idle, but too lean at the top. 14.9:1 A/F at 5300 rpm. 11.7:1 at idle. Crocket thinks the upper end is due to not enough fuel and we'll need to upgrade the fuel system.

Brad has the Aeromotive pump in stock ready to go, so we'll most likely plumb the Aeromotive system to fix her up. If we have to do it, this will be the quickest way to go with good parts. Oh well, it's only money right!

Everbody keep your fingers crossed for the program to be right tomorrow!

Not sure of the cam... and i'm doubting JC would remember.
Had an 850Demon Carb, and Zul ported intake manifold.
It did idle just around 700, and was pretty tame, bit did need a goose every now and then, but that just made it sound badder around the docks.

Jeff, you had no interest in selling the 24 w/o power for the mig??? ;) that would a been a $10k upgrade at the min.

Is your computer a MFEI-3?
Are you using the stock injectors?
I would think watching the fuel pressure would tell ya if you need a bigger pump.
One other thing you may want to ask Crockett about. I've heard there is a flaw in the fuel rail that can cause #7 to lean out. I know my 1997 has this flaw, but it was corrected around the time your 2000 was built.

JH, Sounds like you are on your way to something like this with even more grunt:D

It is an MEFI 3 with stock injectors. The injectors have all been flowed and cleaned. We didn't get fuel pressure numbers on the run as he was just getting EGT & A/F ratio for Crockett. Apparently the unit on the dyno that reads fuel pressure is broken on the right now. It must be a POS cause it's broken on Crockett's too. Crockett is going to look back through the program for us and see if there is any computer reason for the lean out up top. If not, then we can reasonably believe the fuel system is to blame, and we'll add the new fuel system to be covered. Once we get it back, we're going to run with a mechanical gauge installed to know just what's happening.

Doesn't that have around 600HP? I'm not goin that big! My little 500+ will be just fine. I'll definitely surprise a few people. There are too many cocky Baja drivers on Grand that could stand to be taken down a peg or 2:D

Oh, and some cocky Activator Drivers too!:angry-smiley-044:

Nope just a TAD under 500hp....499hp on the dyno:D Spins up to around 5600-5700. Trust me you will be able to surprise a LOT of people.

All this talk about 500HP engines and going 80+mph in a 24'...:p
Man, I'm going to have to show some real restraint this off season...:rolleyes:
I just keep telling myself that she's running too good to screw with her...:cool-smiley-027:

Hey Jayhawk,
I think you might want to hunt down a 25p Rev 4, a 26p B1, or a 25p P5-X prop to test with. I'm quite sure that you don't want to run a 3 blade on a step bottom 24' at 80+mph.

I've already talked to Brett about doing some prop testing. He has a pretty good program for that. He has my prop right now as I put a pretty good ding in it last time out. For some reason I thought my boat was "shallow draft" and tried to put it in a slip it didn't belong in.:rolleyes:

Maybe I'll have him send a 24 P Rev 4 with the my prop and see how that goes.

You better keep yours the way it is Pat. Your family will be upset if she doesn't run in the spring!:D

Oh, and right now I have to say that I'm not sure T.C. is taking care of my needs computer-wise. He doesn't want to take the time to talk to me or my engine guy to go over what is happening to make sure we get it right. He supposedly has sent the computer back for us to have today. I'm worried though that he wouldn't take the time to talk to us to make sure this thing is right. I just have a bad feeling that it is going to be wrong again. If it is, he's going to get an earful. I've only spent about a grand with him, so maybe I'm not as important as someone who buys his whole kit, or does the entire engine with him? I don't know. I'm just getting a bad "I'm too busy to deal with you" vibe and I'm not crazy about it.

If I'm smart I'll leave the 502 that is in my boat alone until it starts to make problems. I have a 454 in my basement to play with but it would sure be easier to just swap the valve train parts in the 502...
I have only heard good things about TC. My personal experience is only buying a few parts and asking for advice. He has never put me off like you...

Spoke too soon on this post. I'll reserve judgment for a little bit. The computer came in the shop just now. Brad's going to spin it up on the dyno and let me know what's going on.

Glad Crockett didnt use his knife and cut the cpu like he did the t shirt I sent him :rolleyes:

4 blader is a must. Good Luck with 2nd pull!

Brad just sent me this... his dyno wasnt working so he put your motor in his vette for testing today. :hitfan:


http://videos.streetfire.net/video/7...091AC2B267.htm

(in my best Homer voice) DOH!!!!!

A/F might still be slightly off.

Computer is back and looks to be much better. The stock fuel system is dropping WAY off at about 4600 rpm. It dropped to around 18 psi. He is going to replace the stocker with the Aeromotive unit and that should take care of it. He is going to see if he has all the stuff he needs there. If so, we can dyno tonight. if not, it will be Monday. He did say that at the lower rpms it is making substantially more torque than with the old program. Hopefully that is a sign of things to come!

Great News on the Computer!
Your stock 800 hour fuel system must be tired; I think it is the same Cool Fuel Unit used on the 500EFI.
Are you using an adjustable regulator? What fuel pressure are you running? Just curious...
I think my MEFI 1 runs 36-38psi and the MEFI 3 runs 40-42psi stock.
My pump has like 600hours; maybe I should check the pressure.

It might be worthwhile to check the pressure. We will be running and adjustable Aeromotive regulator with the system. Right now it is the stock cool fuel. He's going to plumb the new pump into the stck rail by modifying it to accept -AN line fittings and then run the return to the cannister filter unit. Is this what is called the Cool Fuel? In any event, it will have a new pump with a return circuit. I'm not sure what pressure we're needing to run, but I think the 42-44 psi range is what Brad is saying. We'll see, hopefully tonight! Think positive for it to happen! You too Masher!!

Good Luck, we are pulling for you.
The Cool Fuel unit gets its name from the cooling water running through the center of the unit.
You were running cooling water throught it, right? If not, that may be why it's loosing pressure.

I'm sure the water was running through. Brad knows it is a cool fuel and knows how it works. I just don't know. I'm not up on all of this boat specific stuff. A lot of it is still pretty new to me. Engines I know, but the boat stuff attached to it I'm still learning.

:hitfan:

Retrospective look at Slim Lady on Grand about a month and a half ago? :rolleyes:

So where are the numbers?

We're set to do the full dyno pulls on Monday. Brad had to get the fuel system in order and didn't have all of the parts. He should have them Monday morning, so we should have numbers Monday afternoon. I'm going to takes some pics and video for posting.

I think we should send Masher up there to help Brad with the Dyno pull. You won't see the numbers you want until 6700 or so. I am sure he can try for you.:cool-smiley-027:

Oh no no no! Masher no touchie!:violent-smiley-021:

Off to the Dyno shop!:party-smiley-048::circle:

Dyno Info In!!
 

Ok, it was a little lower than hoped, but still pretty good considering. We hit 501.3hp @ 5200 rpm & 535.7 lb*ft of torque @ 4629 rpm. The torque curve is pretty much flat after 3000 to 3500 rpm. This is going to be an accelerating monster! I think we ran out of intake manifold, because the horsepower went flat at about 5200 rpm and didn't fall off for a while. I guess I can only expect so much from the stock manifold. I've attached the dyno sheets as well as the links for some videos. Can't wait to get it back together and try it out this weekend!

Trying to embed video number one...

Embed didn't work, here's the links:

http://www.youtube.com/watch?v=0_PUZgc51O0

http://www.youtube.com/watch?v=BeWY-ZNwBBk

Looks great to me...
There are mods that can be done to the manifold to shorten the runners; probably not worth it at this point though.
I'd prop for 5300-5400rpm. Most of the prop gurus say that you want to be at least 1000rpm over peek toque.
My guess is that you will be in between a 26p and 28p B1.
Maybe try the 28p first.

looks good.
get it in, and get it out there.

Pics on the dyno...