My view of the 2400 brx

[atc250r]

Ah, maybe just a couple of fingers then. My 200 on a 21 foot boat is about 20 GPH.

 

[jshepherd]

That's 10-11 GPH (gallons per hour).

At 40-44 MPH+, I am at like 10.2 GPH. So, that's just a little over 4 MPG, which is pretty darn good for running at 40+ !

At 63 gallons, that's over 252 cruising miles @ 40-44 MPH!

Oh, and I am at 9 hours for engine time, so it is my understanding that extra oil is still being pumped. That 4 MPG should go up a little. People see anywhere from 4-6 MPG depending on the boat, etc.
.

Yes GPH sorry haha. You are seeing the same as I am. 12 hrs on the motor so far so I doubt mine is still double oil.

Going to the trophy without the ring this will go up (get worse)

 

[Philster]

atc250r: On your boat, an Optimax would pull 5-6 MPG, or about 8 GPH. Use that as a reference.

.

 

[High Voltage]

I talked to Wildman today, what a wealth of knowledge he has. He told me to try a 23 pitch trophy as well and try to leave the plugs in first to see how the hole shot was then if needed more than take 2 out. We ran 100 miles this weekend and showed 7.8 gph for the day with 6 adults in boat and full of fuel, so im not complaining at fuel consumption way better than what i had lol. Leaving the motor at 3.75 below and he said my chime walking was i over trimmimg the boat that is something i will have to learn he said way different with an outboard. I am going to ordered his 15 inch jack plate and try it, he says it will make a world of difference so we will see. Now i have to find a trophy before the weekend. I also am goin to try a 24p masco 3 blade as well.

 

[Philster]

You have 10" setback via a jackplate already - right? Do you need a whole nutha jackplate?

You can add 5" via static bracket or spacers or something.

 

[jshepherd]

I talked to Wildman today, what a wealth of knowledge he has. He told me to try a 23 pitch trophy as well and try to leave the plugs in first to see how the hole shot was then if needed more than take 2 out. We ran 100 miles this weekend and showed 7.8 gph for the day with 6 adults in boat and full of fuel, so im not complaining at fuel consumption way better than what i had lol. Leaving the motor at 3.75 below and he said my chime walking was i over trimmimg the boat that is something i will have to learn he said way different with an outboard. I am going to ordered his 15 inch jack plate and try it, he says it will make a world of difference so we will see. Now i have to find a trophy before the weekend. I also am goin to try a 24p masco 3 blade as well.

I am not sure I agree. My 24 trophy was at around 6100 which is where he said the sweet spot was. Do you plan to have the boat heavily loaded all of the time? If so that makes sense.

I believe something isn't right with your gph readings unless you are well below 40 mph. You are watching it on the instant screen correct. Maybe we are just comparing different things.

I am not sure that the 15" will help. I don't think Randy is getting any more speed then you or I . I am on 10" set back and have been to 72.7 and 72.x on both a 24 trophy and 25 tempest. What is his theory on running more setback?

If you watch gps very closely you will find that at a certain spot the speed will not increase and stability decreases if you keep trimming out.

 

[High Voltage]

I paid more attention to gph this weekend didnt know it was instant so im figuring around 4 to 4.5. We had alot of idle time this weekend. The more i read your guys post and on the internet im sticking with tempest and dial boat with it. I ordered the seal. Save some money and goin woth the simon motorsports upgrade.

He is saying more speed with more set back.

Really appreciate the info from you guys.

Taking a hand held gps this weekend to.

 

[Mark]

If you guys ever get the chance, try a Rev4. It is the cat's meow on my Starliner. They are basically a 4 blade Tempest. One pitch stiffer than both the Trophy and Tempest in same pitch though. Very smooth and great lift and load carrying because of all the blade area. Better than a Bravo on boats that need bow lift. I don't know if kct11 ever tried his 23 Rev4 on his 2400.

 

[jshepherd]

He is saying more speed with more set back.

T

What is his highest speed on a 2400BRX ?

 

[nathan]

I don't know about a 24 but he has pushed a 21 to 96 mph

http://checkmate-boats.com/forums/showthread.php?t=20618

 

[High Voltage]

He told me 71 to 72 in a brx and 77 to 78 in closed bow

 

[Philster]

Wildman has run a 2400 BRX to 69 and change on You Tube. He has documented the other 24 closed deck (high 70's, even 80 maybe?) and 21' boats (80's and 90's) on there, too.

Extra setback gets more hull to fly because of the angle of attack. Less wetted hull = more speed. Every 10-12" of setback means raise the motor an inch (generally).

I could not go to 15" of setback (I am at 10). The way the boat would rock fore/aft and with the extra setback putting the motor on a longer seesaw arm, I just see it as a chance to dunk a $20,000 engine. I'm in coastal water and in a following sea forget it. Too much setback on a 2400 BRX is asking for it. Maybe an offshore boat can run engines way back on brackets 15-18" out, but not a 2400 BRX.

Also, back to GPH verus MPH. A 300XS will get you 4+ MPG. At cruise speed of 40-45, the Smartcraft calculation should show about 10 Gallons Per Hour (GPH). You will go 40 miles in one hour and burn 10 gallons to get there. That is 4 MPG. (It's probably better than that, but rounding to make it clear).

Boats don't have perfect props. Every prop is a compromise, unless you run it with a custom labbed prop in the same atmospheric conditions with the same load. When it gets hot and humid, you will lose 2 MPH. Come to the salt water, which is more buoyant and the hull will fly better.

Given the various loads and atmospheric conditions, you need to swap props to get all the MPH.

A labbed, 24p Trophy prop dialed into deliver 6200-6300 RPM under light loads will probably be the best single prop solution. When lightly loaded, you will crack 70, but have to self-limit RPM, unless you want the engine comp to do it (but that sux). When loaded up moderately, you will push 70 still and probably 6000 RPM.

 

[High Voltage]

Thanks Philster for the info. I was sitting at computer all night reading on different sites and getting more confused which is easy for me lol. So this morning i have decided to just leave the boat as is, same set back, same height same prop. The more i read and listen to you guys its obivious that moving motor, changing props im only looking at small gains. I am goin to try the 24p trophy Philster has mentioned because i do have a buddy that has one i could try. I think i am goin to just wait and get the Simon Motorsports upgrade which i will have to buy a prop for that anyway and get my performance gain from that.

I cant tell you enough how much this forum has educated me. If any of you are down at Lake of the Ozarks look me up, would love to meet up with you guys take the wives or GFs out and ill buy dinner and first round.

 

[jshepherd]

Thanks Philster for the info. I was sitting at computer all night reading on different sites and getting more confused which is easy for me lol. So this morning i have decided to just leave the boat as is, same set back, same height same prop. The more i read and listen to you guys its obivious that moving motor, changing props im only looking at small gains. I am goin to try the 24p trophy Philster has mentioned because i do have a buddy that has one i could try. I think i am goin to just wait and get the Simon Motorsports upgrade which i will have to buy a prop for that anyway and get my performance gain from that.

I cant tell you enough how much this forum has educated me. If any of you are down at Lake of the Ozarks look me up, would love to meet up with you guys take the wives or GFs out and ill buy dinner and first round.

Phil hit it right on the money. I am going back to my 24 trophy. I do not see any reason to run a tempest.

I would like to try other 4 blades though. The trophy has a small hub which forces a lot of exhaust over the hub. Running the sealing ring may create too much backpressure for a 3.2 litre but I am not certain.

I plan on going with Simmons or DBR as well at some point.

 

[Philster]

Also, Wildman pretty much set the baseline for all this.

With different loads, conditions, waters, needs/wants, you have to work off his baseline and drift accordingly.

 

[Double J]

Hre's my take on somethings. I have ran over 250 hours on my 300XS on my 2400LD and averaged I believe 3.5 to 3.8 mpg. I have never seen 4 mpg 'avg on a tank whether I cruise, idol or run hard. Onset back I run 19" and run in sometimes up to 3' swells in the Gulf (usually not by choice) with no problems. Never had a issue with the motor being to low in falling seas. Best so far has been 78.2 fying solo. Usully can see 75 with a light load and two people. Just my findings of almost 4 years running this boat.

 

[Philster]

Good info.

Still, 4+ MPG (10.2 GPH @ around 42-43 MPH) is what I get, and I am running a Tempest Plus right now.

Biloxi, MS is Africa hot. And Humid.

This time of year, it's probably about 70 degrees on the water most times I am running, and low humidity. That = power and efficiency.

 

[jshepherd]

Hre's my take on somethings. I have ran over 250 hours on my 300XS on my 2400LD and averaged I believe 3.5 to 3.8 mpg. I have never seen 4 mpg 'avg on a tank whether I cruise, idol or run hard. Onset back I run 19" and run in sometimes up to 3' swells in the Gulf (usually not by choice) with no problems. Never had a issue with the motor being to low in falling seas. Best so far has been 78.2 fying solo. Usully can see 75 with a light load and two people. Just my findings of almost 4 years running this boat.

Did you have Simmons mods done to yours? I thought I remembered reading your posts.

 

[Double J]

Yes I did the Simon mods. The flywheel mod I would recommend but the other mods aren't enough bang for the buck in my opinion. And yes it is hot here(try 90 degrees in the day and the water temp is already above 80 degrees).

 

[High Voltage]

Well tested on monday 25p tempest with 1/4 fuel on hand held gps went 70.3 mph a 24p trophy same fuel on gps went 71.6 mph. the tempest only turned 6000 rpms turned 6250 with the trophy.