Rick have you guys rigged one with that much HP yet?
What speeds would it run low 80s to low 90s?

Their Is An Older 24 With A 598 / Bravo And A Herring Running Over 100

Isn't that the owner of Activator's boat?????

I remember speaking with JC about power in the 24' a couple of years back when I was rebuilding the 502MagMPI for my boat.
He told me that he did have people ask to rig boats with 500s and turned them down. To my knowledge a 415HP/502Mag is about the biggest a 24' Super has left the factory with.
As for how much power to run in the low 80s? About 500HP...
To crack 90mph would take a lot more, probably as much as a 30', 700HP???

I met a guy late this summer. 598ci in an older 24'. He did not have it dialed in yet but seen #'s in the upper 80's. He said he was happy with the motor performance.From what I remember him telling me was dyno in the upper-mid 6's. No tripple dig's on the GSB.

Years ago I had a 24 Superboat with a Gale Banks twin turbo big block. We never dyno'd it but it was probably making 700+ hp (14 lbs boost) It would bury the Nordskog 80 mph speedo. (long before GPS) the last prop we had on her was a 29p Mirage @ 6300 rpm. Man, what a wild ride, but lots of fun and it was quite a sleeper (turbo's take the bark out of the exhaust) I sold it to a guy from Winnipesaukee back in 1995 and he still has it.

Kurt

Turbo always scars me a little around here with the salt water and salty air. I think pat's formula is about correct 500 HP low 80's if it is dialed in correctly. (( I noticed alot of diffrence between radar lately, GPS and spedo reading in some of the boat magazines I read - the diffrence can be as much as 7mph )) I would rather one source, one reading, so boater don't throw out #'s all the time like we were stock brokers or bankers. I personally like GPS because you can recall the speed but GPS owner very rarely calibrate there GPS where they buy them. GPS need to be calibrated to you specific elevation, your model gps may have been built in CA at one elevation 500 above sea level and you live in New Orleans below sea level this give an inaccurate reading on GPS MPH.

I would say Pat is right on....from what all the previous owners have told me and seen on GPS, 500hp will get you into the low 80's...and this is with a non-step, talk to Dave M ...his Step bottom with a 496HO is JUST shy of 80 at 79.x I believe. I also agree with JC....I am not too proud to admit it but I am still learning the limits of my boat and still can give me a wake up call at times....it is the mid range acceleration and torque of the motor that can make things interesting at 60+

I few years back I corresponded with a fellow, Gary in Albany.
Gary had a 1995 24' Super that he had purchased new.
The original power was a 350HP/454Mag carb'd engine.
The boat ran 73-74mph GPS at 5000rpm spinning a 3 blade 25p Mirage.
Gary pulled the engine and had it dyno'd and it made around 400HP at 5000rpm.
Then he had the engine worked over, ported heads, roller cam, new intake, carb, ignition, exhaust, and...
After some $5000 in mods, back on the dyno; she made 498HP at 5600rpm.
He said with the same 3 blade prop she ran 81-82mph GPS at 5600rpm.
Cracking the 80mph mark was confirmed by the next owner of the boat here on OSO as well...

Now to go over 90 I'm not sure how much power?
I will say that these hulls do seem to hit a wall around 80.

It has also been discussed over on the Pantera forum
about power in the 24'. Lots of guys say that with 500HP a 24' Pantera runs high 70s and touchs 80. Jo at Pantera says that he has rigged 24s with HP500s and they run 82mph.

I have boated a number of times with T-Mone here on OSO. He has a 24' Pantera with a 502cube that dyno'd over 600HP and estimates she makes 575HP in the boat. His boat runs 80mph all day long with a 5 blade and not much more than 82mph with a labbed 3 blade.

Not to pick on you or anything, but this is the second thread I've seen that you talk about GPS calibration. I have recently purchased a Garmin hand held unit. Not only does it say nothing about calibration in the owner's manual, I have been through all of the settings in the machine. There is absolutely no setting for calibrating the unit.

Also, thinking about it, why would you need to calibrate a gps for elevation? A gps is designed to tell you your elevation no matter where you are on earth. It works by finding satellites in the sky and triangulating your position based on those. They don't care what elevation you are at. It only matters what elevation they are at to do the triangulation. A gps functions based on objects in space, not objects on the ground at any elevation. Having to calibrate one doesn't make sense to me.

As I said, I'm not meaning to bash, but I think you are spreading some misinformation.