Wanna see what boat/engine/prop set up you running?

[G - FORCE 88]

I am curious to see what my fellow Donziers are running on their boats? I am doing research to see what prop I should get. So all the info I could get I would appreciate. I am spinning a 25p Mirage(not plus) on a 22 classic witha 454 Mag(385 Hp), 1.5:1 gear ratio, Bravo 1. Im running by speedo a solid 73mph with 1/2 tank of gas, one person. I guess this should help. :D :D

"wanna go faster!"

[Greg Maier]

Is your speedo a GPS or a standard pitot tube type? I think that most people here use GPS speed for consistency.

[BUIZILLA]

G Force, based on boats I have seen, I think your 73 with a 385, is a tad...well...optimistic wink
If my handheld GPS comes in the mail today, we can hook up for some testing tomorrow, or next week when my Minx gets here...I need to baseline this bone-stock Minx before the mod's begin.

Any Fla. peep's up for a Matheson-Holiday Isle run next weekend? :D

J

Minx goal - 75 mph, 100% stock appearing

[ClassicRazorback]

I hope your spedo is correct, but I bet your running about 69-70mph.

My 1996 22 classic:
454 385hp 23p 68mph @ 1130 ft elevation
502 450?hp 25p 72.6 @ 725 ft elevation
502 450?hp 25p 71.6 @ 1130 ft elevation.
(I use a GPS5)
Waiting to see what it is with the new CMI exhaust and SeaDemon carb.

Hope this will get me over 80!! :D :D

Hope this might help.

Chris

[Fish boy]

G-force, what rpm's are you turning WOT with the 25 mirage?

[G - FORCE 88]

Buizilla: Thanks for the invite, I have a home down in the Keys so I will be down there. Im there every weekend. I was at the Sandbar last weekend. I would like to hook up for some fun.

ClassicRazorBack: I am turning a 25p Mirage at sea level. Gauge(pitot) says 73mph at 4700 rpm. I wanna know if labbing will help me out to acheive this on GPS. I might hook up with Buizilla for GPS testing next weekend.

Scott,
You going to the races?

[BUIZILLA]

G-F, you talkin the Holiday Isle sandbar or Sands Cut ?? just a small difference in mileage :p

J

[G - FORCE 88]

S,
I will try to make it out there as well. Just like you said. If its to rough take out the big fish boat, but if not for sure Donzi time.

Bui,
I was talking about Holiday Isle. My boat is at my house down there. Where were you thinking going? What do you have?
J eek!

[BigGrizzly]

G- force at 4700 with a25 marage not a plus and a 11.5:1 will net about 68 mph on a good day on a 22 foot clqassic.mto get to 70/71 you need to spin iyt 5000. My speedo is good untill 60 than it turns really optomistic. The pitot type is also air density sensitive.

ClassicRazorback, I feel it will take over 100 more hp to push the 22 Classic to 80 with a stock lower unit. It will take a lot more than thwe carb and the CMI exhaust to net that hp. Both Todd and Ted have done this with HP500 and the exhaust(Todd had a CMI) and had to use an Imco shortie to get there. At the time they were using Lab finished 29 marage plus props. Good luck , I am intersted on the gains with just the exhaust, so let us know.

[boldts]

G-Force,

1998 22 Classic - 454MAG, 1.36:1 Bravo1, Full tank, using a 23" Mirage (Not Plus) 65.7 GPS, using a 22" Turbo 68.7 GPS

Mirage prop porposed until the throttle was full and because of the bow lift, I couldn't run the trim out very far either. Put the Turbo on the boat and not only gained speed, but no more porposing and able to run all the trim I want with the boat nice and steady.

[G - FORCE 88]

Bolts
I am curious what size was your 22 Turbo was? I have a 24 x 14 1/4. I wonder what that would do? It just seemed to small for the boat. So I havent even put it on. Would that be a good size? How about 4 blades? :D
thanks
J

[G - FORCE 88]

I have the 385hp 454 MAG
j

[ClassicRazorback]

Randy,
I was just kidding about 80 mph. :D

I would like to get 75.

How fast is that 22 Limited Edition w/Whipple Charger????

Chris

[KRAVEN]

Running a 377scorpion, 25 mirage+ labbed, 5000 rpm Bravo1 xz drive best to date 76mph garmin handheld gps
DONZI + WATER = :D

[Ranman]

1997 18 Classic 350 MAG MPI (300 PSHP) 1.65:1 Bravo One spinning a Mirage Plus 25P. 66 MPH all day with 3-4 people and a full tank. 68.5 MPH, on "E", with one person, into the wind, on a 1' chop, downhill.

[BigGrizzly]

They tell me thw Wippled charged 22 special is running in the I beleive mid 90 mph. Te has over 750 ponies in it I am told -never saw a dyno sheet. I run mid 80's with the best GPS at 86.9 mph. I dyno in at -best 698 HP on a good day depending on air density. Worst day was 675. I run a 28 inch pitch Turbo Lightning at 5200 and a 1.50:1 gear. I also use a 27 TurboI, but havn't compaired top speed in over a year. I use the 28 to keep the RPMs down. These props gave me more speed and better handling than the Merc mariage plus or the Bravo I both labed and unlabed. BTW my Turbos are not labed.
G-Force I beleive Tom is running a 25 Turbo on hid 454 Mag 22 Classic.

[Bad-Tat]

G,
415 hp Mag Mpi 502, 31" props, Blackhawk drive 1.5 ratio. So far 78 GPS with tabs dragging. Just have to learn how to drive it better and should be around 80.

[boldts]

G-Force, probably the biggest difference between my 22 Classic and yours is that mine has a 1.36:1 gear rather than the 1.50:1 ratio. My 22" is a 14 1/4 diameter. I would put your 24 Turbo on her and see where she is at using a gps hand-held. Your Thunderbolt ignition I believe has a 5200 rev limiter. I may be wrong about the RPM. If the 24 turns more RPM than the recomended 4800, then you just need to add more pitch depending on where it's at. For every inch of pitch added to a prop you usually lose 200 RPMs. Most prop shops can change a stainless prop's pitch by 1 + or -. (24 to a 25 or 23)

As far as the 4 blade, when I inquired with Turbo about their prop, they told me that either prop works on our boats, but the 3 blade is just a tad faster. I am planning to try a 4 blade on my boat at AOTH III just because Turbo represenitives will be at our gathering with props for us to try. I may put a 21" on also to check speed vs the 22". As you may have noticed, even though I put a prop with less pitch on my boat, I gained speed. Just want to try a 21" to see if that trend continues with more RPM.

[catch 22]

Hi everyone, I have a 1998 22 classic. 454 mag. 385hp. Bravo 1. Not sure of gear ratio. I am turning a 23p mirage plus not sure of the rpm. Half tank of fuel with two people 67mph on gps. I have a 4 blade hydromotive also a 23p 4700rpm at 66mph on gps. The hydromotive was so much more stable than the mirage plus. What pitch turbo would you guys reccomend? (Style). How would I find out the gear ratio? Poodle told me about the 4 blade and he was right. The boat is much more civalized. Thanks for any info. Jim :)

[G - FORCE 88]

I like all the posts guys! lets keep them coming. Ive learned some cool stuff so far. How do I find out for sure the gear ratio of my drive. How do gear ratios work on the outdrive? higher better? lower better? i really dont know? how does the gearing affect rpm's and speed? Im lost can so :Dmeone fill me in?
thanks
J

eek! "faster, wanna go much faster" eek!

[boldts]

Let me take a shot at this.

1.50:1 = Engine turns 1.5 revolutions per 1 prop revolution.

1.36:1 = Engine turns 1.36 revolutions per 1 prop revolution

This means that usually an engine will be able to turn more pitch and at higher engine RPMs than an engine trying to turn a 1.36:1 gear ratio due to the engine turning less RPMs. EX: A boat turning a 23" pitch on a 1.36:1 drive ratio should be faster than a boat with a 1.50:1 drive ratio if it can still turn that drive ratio at the 5000 RPMs that the boat with the 1.50:1 ratio is turning the prop. The 1.36:1 allows the prop to turn more times per revolution of the engine. What you can turn as far as prop diameter and pitch relates to the torque that the engine can produce. You want your maximum torque I believe to happen at the maximum RPM for your engine model. (Help Big Grizzly if I'm wrong about this)

Since a 454MAG with a 1.50:1 gear ration turns more RPMs per prop revolution, you use more prop pitch to keep the engine RPMs in the recommended range. Pitch is equal to the distance the boat should move in the water. There is slippage involved here, but that is an even longer addition to this post. Anyway, because you can turn more pitch in the engines RPM range, a 1.50:1 boat is usually faster than a 1.36:1 boat with the same engine.

So, in my case, a stock 454MAG with a 1.36:1 gear ratio behind it, requires a smaller pitch prop to place the RPMs in the 4600 to 4800 engine range.

Here is the reason that most Mercruiser drive ratios are changed from 1.5 to 1.36:1. When you install a high horse power or higher torque capacity engine, prop manufactures do not manufacture a prop with enough pitch to bring that big HP engine down to respectful RPMs for engine life. So, a 1.36:1 gear ratio is placed behind that big HP, massive torque engine to now allow you to run a prop that is currently being built by manufactures. Your engine is turning less RPMs per revolution of the prop.

Speed occurs by the torque curve of the engine. If you can turn more pitch at less RPMs, the boat is faster.

Only way I know to find out your drive ratio is to work with a friend. Manually rotate the engine from the front crank bolt until your prop makes 1 revolution. 1.50:1 is fairly easy to see since your engine should turn 1 and a 1/2 revolutions per 1 complete turn of the prop. Anything over 1.5 will be a bigger number drive like what is sometimes used on smaller engines like 1.84:1. Anything less than 1.5 will probably be the 1.36:1 gear ratio.

Hope this helps and I hope I have it straight. I'm about 99.9% sure I have it correct. :)

[Ranman]

So what you're saying Scott, is that you need to get a ProCharger back on your boat. :D :D :D

[Rootsy]

"faster, wanna go much faster" hmmmm call Roadtrip and Imco... they should be able to help you fill that request... wink

[boldts]

Yep, or one of those 575SC's coming in somebody's new Sonic and a new Mercruiser shortie! :D eek! :D

[catch 22]

Scott, Info is very helpful. Should the three blade mirage plus turn the same rpm's as a four blade hydromotive with the same pitch. (23), with the same gear ratio. Not sure what the rpm's were on the mirage plus, because I was trying to look at the gps and runover jetskiers at the same time. Oh I was trying NOT to runover jetskiers. Thanks again for the help. Jim P.S. I like the 575SC idea myself. :cool:

[Dalelama]

Scott - Jim - G,

Can't make the race... flying aerobatic contest at Sebring thurs-fri-sat... flying home early sun morning, gotta wait for Ceci to drive back down US 27... might make the awards party at the
Marriot... look for ya'll there.

Jim, You can pick us up at the Seminole ramp (Dinner Key) sun afternoon, in the Minx....
we live across the street!