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Old 08-30-2012, 03:49 PM
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Kawasaki DFI 37 hp Fuel Numbers

I was told today by the engine specialist at Bobcat mower there had been extensive studies done on the FX1000-DFI by their facility. I told him to let me guess how much difference the DFI made over the carburetor model. I told I would guess it moved the fuel consumption down into the 1.4 gph range, whereas the carburetor model was in the 1.8 range. He said, "we have seen numbers down to 1 gph." He then began talking about how Kawasaki continued to tweak their DFI system with the E-Governor.

The E-Governor is a feature than can really save fuel, and is a feature which Generac has used on their generator engines for years. The electronic governor uses a computer to sense when the engine is coming under load, therefore enabling the fuel delivery system to infuse a smaller amount of fuel to hold the rpms at the top of the machines operating range. A mechanical governor does not sense the load is about to change, meaning the rpms begin to drop before a mechanical governor attempts to play catch-up by telling the fuel delivery system to dump more gas into the engine. This is actually telling the engine to call for more fuel than is necessary to bring the rpms back to top operating level.

The E-Governor has been used by Generac for the fact of not allowing voltage drop, it senses electronically when the engine needs more fuel to hold its rpms in its top operating range. This prevents A/C compressors from working harder due to voltage drops (just an example).

I told Bobcat they were way ahead of the competition curve in only offering the DFI on their Predator Pro. He told me after looking at their fuel numbers, they saw no reason to offer an engine with less hp, and worse fuel economy. He also made the statement that it would not be very much longer until all mower engines were fuel injected.
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Old 08-30-2012, 07:02 PM
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1 gph to me is exceptionally good for a 37 horse engine. I do wonder how much load the engine was under when taking those measurements. Such as sitting still with blades on, mowing 4" tall grass down to 3", or mowing 10" grass. My hustler dealer also says all mower engines will be fuel injected too.
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Old 08-30-2012, 07:08 PM
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Originally Posted by TNGrassCutter View Post
1 gph to me is exceptionally good for a 37 horse engine. I do wonder how much load the engine was under when taking those measurements. Such as sitting still with blades on, mowing 4" tall grass down to 3", or mowing 10" grass. My hustler dealer also says all mower engines will be fuel injected too.
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They ran test in many conditions, with 1 gph used in what I feel assured was very easy cutting. From listening to the information he gave, I would say you could put the mower into the worse cutting scenario and not go over 1.25 gph.
I am really amazed they could get the 37 into that low a range of fuel usage numbers. I sure would like to see someone who owns this mower come in and contribute some of what I call real life numbers
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Old 08-30-2012, 07:11 PM
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They ran test in many conditions, with 1 gph used in what I feel assured was very easy cutting. From listening to the information he gave, I would say you could put the mower into the worse cutting scenario and not go over 1.25 gph.
I am really amazed they could get the 37 into that low a range of fuel usage numbers.
That is pretty unbelievable, when I check my new super z I got 1.7 & 1.8. I wonder how much difference in gph the larger hydro system on the super z would make over the bobcat.
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Old 08-30-2012, 07:19 PM
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That is pretty unbelievable, when I check my new super z I got 1.7 & 1.8. I wonder how much difference in gph the larger hydro system on the super z would make over the bobcat.
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Everyone I know or have talked with speaks about being in a 1.8 gph fuel usage range with the FX1000V. I feel assured depending on conditions and blade drag it could fall a little lower, or go a little higher. I would also guess the 16cc pumps Bobcat uses on their Predator Pro would take less power to operate, but when saying that, they still advertise 13.5 mph ground speed. From what I found on all mowers I've checked, and the ones I've had others check, you can normally expect about 1 to 1 1/2 mph less than what the companies advertise.
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Old 02-09-2014, 05:16 PM
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I know this is an old thread so I'm hoping someone can give some updated info.

I'm considering new SZ HDs with the FX1000 DFI power plants and am wondering if anyone has got any real world gph #s together on comparable machines.

Another thread or so I have read made it sound like there was no, or little, gph savings on the DFI vs carb units. Short of gaining an extra horse power and in theory maybe a little longer life expectancy I don't see the value if this is the case. 37 hp should already be enough hps to make the most demanding LCO happy I would think.
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Old 02-09-2014, 10:43 PM
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I have had a 37 DFI on a Ferris 3100 61 inch now my dad has it. It has some power but it is in the 1.8-2.0 range on normal mowing at a fast pace... I have a Ferris 3100 with a 32 Vanguard now and it does better on fuel but I haven't checked it since it was new but it was getting 1.8 on it's worst days... I also have now as of late a John Deere 970a with a 72 inch deck with the 37 Kaw carb engine and it is a lot smoother engine than the DFI.... I don't like the DFI it's loud and knocks and ticks. The carb version and the vanguard is a lot smoother running engine... All three of these mowers was advertised at 12 mph and on two different GPS they all are around 13.4-13.8... But I took the stops off of all three of these mowers...
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Old 02-09-2014, 10:46 PM
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The newer DFIs could be better on fuel the DFI I had was a 2010 model... I believe the EFI closed loop engines are going to be the ticket to power and fuel economy... And hopefully quit and smooth...
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Old 02-17-2014, 02:30 AM
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This is maddening. So the DFI may give the slight hp increase of almost 1 hp but no fuel savings and cost more initially? Wow! That's just terrific. I see no benefit to be had. Why should anyone consider one over a carb version of the same engine? Approx. $800 more for DFI I'm told.

My Kohler EFI was a definite winner for me. No valve adjustments and close to 1.0 gph on a 28hp (probably closer to an actual 25 hp with correct rating). Fuel savings payed off the up front difference of close to $1000 in the first two to three seasons or around 1000 hrs. of use.

Hustler sure seems to be dropping the ball big time in the engine department. Very poor planning. If the new SZs were needing more electrical output to run things they should have addressed this earlier. We've been waiting on DFI to hit the sales floor for well over two years after being told it was coming out and were lead to believe this would save us fuel!?!?!? Now to find out it won't save us fuel but may actually use more and cost us more initially is absurd. Slap the biggest EFI Kohler on there and add a belt driven alternator if needed!!

Looking hard at a TT..........
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Old 02-17-2014, 03:23 PM
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Quote:
Originally Posted by mtmower View Post
This is maddening. So the DFI may give the slight hp increase of almost 1 hp but no fuel savings and cost more initially? Wow! That's just terrific. I see no benefit to be had. Why should anyone consider one over a carb version of the same engine? Approx. $800 more for DFI I'm told.

My Kohler EFI was a definite winner for me. No valve adjustments and close to 1.0 gph on a 28hp (probably closer to an actual 25 hp with correct rating). Fuel savings payed off the up front difference of close to $1000 in the first two to three seasons or around 1000 hrs. of use.

Hustler sure seems to be dropping the ball big time in the engine department. Very poor planning. If the new SZs were needing more electrical output to run things they should have addressed this earlier. We've been waiting on DFI to hit the sales floor for well over two years after being told it was coming out and were lead to believe this would save us fuel!?!?!? Now to find out it won't save us fuel but may actually use more and cost us more initially is absurd. Slap the biggest EFI Kohler on there and add a belt driven alternator if needed!!

Looking hard at a TT..........
I've been studying this real hard due to the fact I believed there would be an advantage with digital fuel injection. I have found the opposite, the fuel consumption is no different than my FX1000V which is the 35 hp carburetor version.

I am highly concerned that no one from Hustler is taking the initiative to find out what advantage, if any, the 37 DFI would give their mowers. When people buy fuel injection they expect a better performing engine with lower fuel consumption. From what I've learned the only advantage is no choke which should make it start somewhat easier, possibly a little more power of which I wouldn't notice the difference over my 35 for the fact it never lacks in power. The fuel numbers I've gathered are ridiculous for a fuel injected engine, and fuel savings is the main reason people would pay for fuel injection.

I told my dealer to make sure he had 2/60" Super Z HD's ready for a friend of mine by the second week in March, I told him by phone this morning. I was waiting on the DFI which is suppose to be available by April, but from the information I've gathered I told the dealer to forget the DFI, we were going with the engine I'm using. I was personally going to trade for a new DFI as soon as my dealer could get me one, but I'm so disappointed in everything I've heard about this engine, I've decided to wait until something changes.
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