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Random Quote: The short way is often the long way!
Considering new outboard(s) for boat. Does the Yamaha fuel management setup give gph, total gallons used, mpg, etc? Does this take the place of a Navman or FloScan or do you still need the other gauges for all fuel info? Are the gauges the same for 250 HDPI and OX66?
The fuel management gauge is basically the same thing as the navman or floscan gauges. There is no need to have both. It will give you fuel burn in mph, gph, total gallons used. If you have twins you can get the info. for each engine seperately, or for both together. They are pretty accurate as well, once calibrated.
IMHO all the others are copies of the Yam Fuel Mgt System. (You do not need a GPS to get mpg.)
The readouts you get are constant for one engine or two combined, your choice (mechanics love being able to measure each engines fuel consumption individaully and for comparison between engines), Meters include; (1) fuel flow meter : gals used per hour, (2) fuel consumption meter : miles per gal, gals per hour (3)fuel economy meter : miles per gal (4) twin engine syncro. meter (5) water separator warning indicator.
I find all those interesting but the biggest advantage to me is the FUEL CONSUMPTION Meter. We all know how inaccurate fuel tank gauges on any boat are (understandable on a moving axis container). Even the Pursuit people told me to ignore their boat tank gauges and go by the Yam Fuel Mgt System. Fill the 150 gal tank...set the meter to "zero"... run the boat... meter says you used 100 gals... you know you got 40-50 gals left and need to replace 100 gals.
So how do you get MPG without speed checking? Unless you calculate it. The calculation will only be as accurate as the device you are obtaining the speed from. MPG is a true representation of effeciency. GPS through NEMMA connection to fuel management is the only way to get accurate MPG! If you connect to the Yamaha speedometer, it will not give you the accuracy as if connected to GPS. Speedometer will only reliably read down to a certain mph or knots. As accurate as the Yamaha speedometer is, it still does not beat a GPS.
BTW if all you want is s gph, fuel used, fuel on trip, then don't spend the $500 on the Yamaha get a Standard F41, or a NAVMAN. You'll save yourself a lot of $$$ and get the same results. Yes the HPDI guages are compatible with the ox66.
One other thought the mechanical and electric fuel guage on my Pursuit is pretty accurate, matches the fuel flow meter close enough,
[This message was edited by KevinM on 08-27-03 at 04:00 PM.]
KevinM: The Yam speedo provides the right input for the mpg meters because it's comparing "apples to apples"! A GPS wouldn't do that. The Yam speedo on the lower unit measures distance traveled thru the water not over the actual surface of the earth as does a GPS. You're right if we're talking about mileage actually "made good" navigation wise, but I thought we were talking about actual consumption and fuel economy here? What's mpg mean when you're going up river at 6 mph against a 6 mph current?
I am trying to get away from the Standard 41 gauge. Installed one in spring, the boat once with it working, next time it had quit already. Called Standard tech and they want me to send the gauge and transducer back for check. Lot of work to derig and be without for a long time already.
Mine isn't connected to GPS, I have no need of that. But when it is connected does it not get both Speed and Distance from the GPS? If not then I don't see how it is any more accurate than using the speed/distance from the yamaha gauge, if anything it's less accurate.
If you want accurate mpg or mph, use a GPS. My Yammie speedo reads 9 mph when I am actually trolling 1-2. It tops out at 26 when I am running 45. I know what the problem is, it is clogged with trash. I am tired of blowing out the tube. I just as soon throw everything off the boat that uses an input tube to measure something be it mph or water pressure. Measure speed with a GPS and if you want to know if your engine is recieving enough water for proper cooling use a temp gauge!
Actually Horseradish a GPS will do that. You can choose either speed over land or speed over water if you have a Garmin 2006 or 2010 with the sonar unit active. Personally, speed over ground is the important to me.
Speed through the water means nothing if you have a head current at 3knots and the speedo is reading 10knots, your relative speed is 7knots.
This of course takes into account the speedo is dead on. So now you tell me, if you will have to increase throttle to get a true 10knots? Don't understand your analogy of apples to apples, because every measurement of distance is across ground!
Connecting to a GPS will give you speed over ground which is an actual and relavent measurement as opposed to speed through the water. So if connected to a GPS your MPG will be a lot more accurate. Under connection to the speedo the MPG could be inflated. Based on my previous exmple the fuel management guage will calculate on 10 knots not 7 knots. MPG with a GPS is the true useage calculation.
bluefin the connection to the GPS will only provide you an accurate mpg reading.
Nimrod, a boat going a true 35 mph over ground with a speedometer doing the speed indication against a 5 knot current will indicate 40mph, sending this speed to the Yamaha fuel managemnt instrument to calculate mpg. This does not take into account the accuracy window of the speedo. Hence the reason I say use a GPS for true accurate mpg indications.
Since you can connect the Yamaha speedo or a GPS to the yamaha fuel management instrument. My point is use GPS inputs to obtain actual accurate MPG readings.
[This message was edited by KevinM on 08-28-03 at 11:13 AM.]
KevinM, If I get on a tread mill with a GPS antenna up the gazzoo, and with one gallon of water, run five miles and consume 1/2 gallon, what is my accurate mpg on the GPS?
If I'm salmon trolling in a major river and holding in place with my outboard against an 8mph current for an hour, What will the fuel management systen tell me when I've gone zero miles using four gallons?
Even if the speedo is not accurate, it still give you varying pressure against water with which you can trim out and get the best fuel efficiency, whether or not the accuracy is there. If your speedo is not working, then the GPS is all you got. Certainly better than nothing.
Zero, you burned fuel and never got anywhere! You don't get it! Your speedo in in that current register mph or knots even though you made no headway! Therefore you will get an inaccurate reading using the speedo since in reality your mpg is zero, but due to the speed recording the current speed sent to the fuel management it will register a mpg number! Effeciency is rated MPG! You trim out all you are going is changing GPH being used not mpg! Get it!
Oh yeah if you think trimming the engine at such a slow speed is going to change your fuel useage, enough to make a significant difference you are misinformed!
We beaten this one up enough!
[This message was edited by KevinM on 08-28-03 at 04:12 PM.]
Please explain fuel management gauge for Yamaha 
it 
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