Quinc
Buy a Superjet
- Location
- California
Because your SN has 40 pounds of wet foam under the tray.
Why don't I ever see dyno's?
- Thread starter bored&stroked
- Start date
Because your SN has 40 pounds of wet foam under the tray.
Schmidty721
someone turf my rails
- Location
- WI
I'm sure there's builders and tuners that have been down that road and have a real good idea what works best with whatever setup. I really doubt they would give up that information, it would be bad business.
DAG
Yes, my balls tickled from that landing
- Location
- Charlotte, NC
Vumad
Super Hero, with a cape!
- Location
- St. Pete, FL
Quinc makes a good point about tuning and props. A lot of us have spent, wasted, a lot of money on props. Not knowing the best prop for my setup is the biggest thing holding my setup back atm i believe. My superjet was much cheaper. The information on what parts work the best together was readily available. Right prop the first time. Ive had at least 3 props on my x2.
Big Kahuna
Administrator
- Location
- Tuscaloosa, AL
What motor, pump you running in your X2?
Schmidty721
someone turf my rails
- Location
- WI
If you are purchasing an engine package from a builder that has spent the money to invest in a dyno, I'd be willing to bet that same engine builder right now, without a dyno, could offer you that same engine package included pump size and correct prop pitch. Probably down to the tail cone and reduction nozzle diameter as well.
Vumad
Super Hero, with a cape!
- Location
- St. Pete, FL
750 bp, b-pipe, custom box, 44s, ada head, lightened flywheel. I just put a hooker 10/16 on it that was too much for another x2. I was turning a 14/19 solas big hub into the 50s but it was lazy on the bottom and i couldnt tune it out. Havent ran the 10/16 yet.
OCD Solutions
Original, Clean and Dependable Solutions
- Location
- Rentz, GA
Nothing. As long as the information you are asking for is actually meaningful, which it is not, other than to the people actually running the dyno and collecting the data in a very specific environment within a very specific set of circumstances. And that point has been made several times now.
You guys are asking for smoke and mirrors and getting upset because you aren't getting it.
IMO, any mention of HP numbers should be met with the exact same response as someone posting up how fast their dreamometer said they were going.
DAG
Yes, my balls tickled from that landing
- Location
- Charlotte, NC
I guess you did not read chucks post about setting up a dyno at an event. Agree dyno "sheets" are worthless. Collecting the data on your motor has value
OCD Solutions
Original, Clean and Dependable Solutions
- Location
- Rentz, GA
Oh I read it. I just think you are going to need far more time to play than that scenario is going to allow. You need hours if not days to gather the kind of information you think you are going to gather from a couple pulls.
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DAG
Yes, my balls tickled from that landing
- Location
- Charlotte, NC
More time would probably be needed but you gotta start somewhere. So many Negative Nancys in this thread. Work towards what you need to optimize the time available
OCD Solutions
Original, Clean and Dependable Solutions
- Location
- Rentz, GA
I've just been down this road before and know where it leads. You think data is the answer, if I only had more data, I could put it all together. Unfortunately that is not true. The truth is, you will learn more from the act of collecting the data than you will from the data itself. And by the time you learn enough to actually understand the data, you will no longer need it.
That being said, I fully support the dyno day, not for the data you will collect but rather for the experience you gain while doing it. We could go back and forth all day but you will understand what I mean as soon as you get into it. You will get far more out of your interaction with Chuck than you will from the sheet he hands you.
You are hung up on the dyno, I was once hung up on exhaust and cylinder temps. A few thousand dollars in test equipment later, I figured out that I can get the same detail from a 3 second reading with a $30 temp gun, a plug chop and piston wash, something the experts had been telling me all along...
That being said, I fully support the dyno day, not for the data you will collect but rather for the experience you gain while doing it. We could go back and forth all day but you will understand what I mean as soon as you get into it. You will get far more out of your interaction with Chuck than you will from the sheet he hands you.
You are hung up on the dyno, I was once hung up on exhaust and cylinder temps. A few thousand dollars in test equipment later, I figured out that I can get the same detail from a 3 second reading with a $30 temp gun, a plug chop and piston wash, something the experts had been telling me all along...
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Quinc
Buy a Superjet
- Location
- California
I use the 1.50$ strips from MC. What is the ideal temp that you found?
OCD Solutions
Original, Clean and Dependable Solutions
- Location
- Rentz, GA
I was trying to resolve impossible carb tuning and piston meltdowns on a Seadoo 1040 BB. Long story short, the ideal solution was to switch to Yamaha and never look back.
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- Location
- Amherst NH
tntsuperjet
Tntperformance-engineering.com
- Location
- Georgetown ca
Here a basic dyno can tell you how much power engine is making and you can run a fixed pipe temp and design better power curve.
But here the negative.
A dyno loads the motor much slower then your pump does.
Now we are talking just a 1/2 second longer changes pipe temp and you already starting to find issues from dyno to water.
I use a converted chassis dyno that is an andrtia dyno so the motor isn't help at any peak RPM BY A BRAKE. This way the motor is free to accelerate like it is in the boat and pipe temps and heat soak is similar to that when you ride the boat.
But I had to adapt that device to my dyno and the drum weight is now different and the calibration is off. It is repeatable but the actual number is not accurate.
But even still it doesn't equate to best water performance.
I found stats radar gun gives accelerate graphs and on board acceleramiters tell the truth.
So if my data logger says the boat accelerates harder and my radar gun says it goes faster and over lay the stats graph to data logger graph. There no question in performance.
What you want. Dyno that says you have the most power possible or a data log sheet that says your boat pulls harder and when you get on it it rips your arms straight like never before and goes higher and rotates further??
But you can also do many Acc runs in different styles and see the difference in them and fine tune your setup to work in more conditions and be more consistent.
But here the negative.
A dyno loads the motor much slower then your pump does.
Now we are talking just a 1/2 second longer changes pipe temp and you already starting to find issues from dyno to water.
I use a converted chassis dyno that is an andrtia dyno so the motor isn't help at any peak RPM BY A BRAKE. This way the motor is free to accelerate like it is in the boat and pipe temps and heat soak is similar to that when you ride the boat.
But I had to adapt that device to my dyno and the drum weight is now different and the calibration is off. It is repeatable but the actual number is not accurate.
But even still it doesn't equate to best water performance.
I found stats radar gun gives accelerate graphs and on board acceleramiters tell the truth.
So if my data logger says the boat accelerates harder and my radar gun says it goes faster and over lay the stats graph to data logger graph. There no question in performance.
What you want. Dyno that says you have the most power possible or a data log sheet that says your boat pulls harder and when you get on it it rips your arms straight like never before and goes higher and rotates further??
But you can also do many Acc runs in different styles and see the difference in them and fine tune your setup to work in more conditions and be more consistent.
naticen
Site Supporter
- Location
- wilmington, nc
I wanna see a comparison of motors from a single builder. I'd like to see a 781 to 900 to 1200 comparison. Then I'd have an idea of whether the different jumps in displacement re worth the price to me
This is where everything falls apart because peak HP does not rise as fast as displacement. Consumers dont understand that it takes a big pump to make more thrust "efficiently". This requires more power at lower RPM where HP# are low. Getting more thrust with less HP is counter intuitive but that is exactly what a 1200 driving a 160mm pump is doing.