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2.4 gal per hour on Kaw DFI 61" deck using G6

Discussion in 'Lawn Mowing Equipment' started by doublesharp, Aug 20, 2013.

  1. greenology

    greenology LawnSite Senior Member
    Messages: 816

    DFI wont be as good as EFI from my understanding of it. DFI uses the same AFR under all loads, whereas the EFI is continually adjusting using the O2 sensor etc
  2. puppypaws

    puppypaws LawnSite Fanatic
    Messages: 9,168

    Kohler EFI & Kawasaki DFI Difference Explanation

    The Kawasaki system is an "OPEN LOOP”, non-feedback
    System. This means that it follows a predetermined fuel map with no
    feedback or ability to adapt to changing conditions or altitude. The
    Kohler EFI is a Delphi designed "CLOSED LOOP " feedback fuel injection
    system. This system uses an oxygen sensor and various inputs (from the
    speed sensor, oil temp. sensor and throttle position sensor) to
    determine what fuel and ignition requirements needed to constantly adapt
    and deliver maximum efficiency.

    The open loop fuel injection systems improved cylinder-to-cylinder fuel distribution and engine operation over a wide temperature range, but did not offer sufficient fuel/air mixture control to enable effective exhaust catalysis. Closed loop fuel injection systems improved the air/fuel mixture control with an exhaust gas oxygen sensor. The O2 sensor is mounted in the exhaust system and enables the engine management computer to determine and adjust the air/fuel ratio precisely and quickly.
  3. Valk

    Valk LawnSite Silver Member
    Messages: 2,738

    Are you mechanically competent? If so, manually check the valves/clearances fwiw. Also, it seems that most are in agreement that G5s, especially G6s need more power to spin them. So, at the very least, check your fuel usage again with your standard blades.

    My lil 16hp Kaw gets by with ~.6 gallons/hr. Yours is 4x more???
  4. greenology

    greenology LawnSite Senior Member
    Messages: 816

    Basically the same as what I said, only more complicated and I don't know that the DFI is a "Kawasaki system" in terms of my explanation anyhow, as I was just refering to DFI in general as opposed EFI.

    So DFI may be slightly better than Carb, but never better or as good as an EFI.

    Just to clear it up for anyone that's thinking DFI is going to be fantastic fuel numbers
  5. CurbAppealKS

    CurbAppealKS LawnSite Senior Member
    Messages: 448

    It's a lot like the old Chevy trucks that had throttle body injection. They were better than carbs, but no where near as good as efi. There are a lot of gear heads that I know prefer a well tuned carb over any form of injection. Of course they have been spinning wrenches for 30 plus years and know carbs inside and out.
  6. TLS

    TLS LawnSite Fanatic
    Messages: 7,943


    Something is wrong. Either with your fillup procedure or your engine! Should be in the 1.5 range for sure.


    The TBI was a big step, and a lot better than any carb.

    It's not always fuel economy, but drive-ability that is gained.
  7. CurbAppealKS

    CurbAppealKS LawnSite Senior Member
    Messages: 448

    Yeah I'm well aware of that, I was just making a comparison. I missed it my one year with my '86. I would have given a lot for a late 80's pickup with tbi.
  8. doublesharp

    doublesharp LawnSite Senior Member
    Messages: 365

    I second the 87 tbi 350 GM trucks. I remember when the 1987 Silverados were closed out at $9995 because of the new 88 body style. The deal was over before I was able to buy one but I picked up a 1 owner 1988 model a couple years later and it was a great truck.

    I called Joe, the service manager at Southern Indiana Equipment, and he said 2 gal plus per hour was normal for the 37dfi so I'll just live with it and it is a fine Mowing Machine, just thirsty. I have learned not to start mowing unless I'm absolutely positive one tank is full. :walking:
  9. CurbAppealKS

    CurbAppealKS LawnSite Senior Member
    Messages: 448

    My old boss scrapes up all of the late 80's trucks he can. I think he has 4 or 5 of them now. They were solid pickups.
  10. TLS

    TLS LawnSite Fanatic
    Messages: 7,943

    Man, I don't know....Almost two and a half gallons per hour sounds VERY high! Like higher than carbed versions, high!

    I would seriously like to see you put factory blades on it and mow as long as you can and fill up at a gas station.

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