I used one on my 23.5 Grady for around 10 years. It was the best investment I ever made. Make sure you have an independent power switch wired to the Flowscan so you can turn the boat off and not have the Flowscan reset.
I looked into putting them on my boat, which has 250 cummins, boy were they expensive. Seems that the diesel models, which have to make provision for the fuel return lines, are much more expensive than the gas models.
I have flowscans on 3208s on my blackfin. They were installed by the previous owner who said he could never get them to work. He said he tried everything. I have not decided to try as other things have been more pressing. I have asked around and the feedback was similar to the previous post-that they are much harder to get to work on deisels because of the correction for the return line.
I have them on my Volvo KAMD-42's and it took a year to figure them out. Cost ~3K to get them installed professionally - dual engine Carolina Classic - of the ~3K - the Floscan's cost ~1400 - the rest was labor.
The key to getting them to be consistent is to have absolutely no air or air leaks in your fuel system. Turns out even a hairline break in your racor's seal will make the flo-scan's jump all over the place and read inaccurately without affecting your engines overall performance.
I also still get different results depending on troll vs run time - my pair average reading 10% high, but in a couple trips have only been 5% high.
I suspect if i took the time to calibrate them and understand in which part of my power regime they are inaccurate - I could get bthem to 2-4% accuracy - but as someone else said - I have plenty of other things to mess with.
I see that you used the term flowscans. I am not sure if this means you have twin engines. If you do I suggest purchasing their unit called the twinscan. I have this single unit on my boat that monitors fuel consumption of each engine and gives a LED readout of total fuel consumption for both engines combined.
We installed flowscans about 6 years ago on our 3208's and have worked very well if installed properly. We installed them having some connections made for us. They work very well - hardest thing is to calibrate them to the nose but are effective. Purchased them about 7 years ago for about I think $500.
Best thing about them besides overall fuel consumption on a trip is that they give you a better idea of how much you burn at different rpm's therefore maximizing your fuel, speed and performance.
With our new 4 blade props from S & S we have seen a difference in speed, gallons burned and the way the boat runs. We can run at our old cruise while burning about 3-4 gallons less.
I was able to see this with the use of the flowscans.
Also just installed a Standard fuel meter on our 23 Mako and can see the difference greatly at different rpms. Very east to install gas applications.
Diesel is a bit more difficult b/c of return lines.
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