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- เผยแพร่เมื่อ 20 ธ.ค. 2021
- This is part 2. Go here for part 1: • Increasing the engine ...
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NOTE: I'm still looking to buy someone an EGT probe and install it for them on their tractor and test on that same hill to get 'stock temps'. If you're in Northeast PA (I'm near Allentown), and willing to bring your machine to me, direct message me on Orange Tractor Talk. My username there is 'netmagi'.
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Investigating the differences between an older direct-injection D1703 and the current direct-injection D1703 that Kubota uses in the L2501. We'll adjust the injection timing (spill timing) with some advance, and adjust the fuel rack as well. The intention here is not to throw emissions regulations into the wind, but to instead explore the differences in these motors and consider the impact of the changes for this specific motor in this specific use case. The motor in the L2501 burns diesel inefficiently and produces a lot of soot due to the lower cylinder pressures and temps. It also consumes noticeably more fuel to produce the same amount of work due to the inefficient burning. By adjusting for higher efficiency, we get less soot, and burn less fuel (don't forget PRODUCING and transporting fuel creates emissions too), but we do get slightly more NOx. What is the sum of all these parts, and what is actually better for the environment in this use case for this specific motor? From my perspective, the jury is still out on the environmental impact, but the power and responsiveness gained is black and white. Comment below with your own thoughts & opinions, but please keep the discussion and debate civil.
I am not suggesting or advocating you make any of these changes to your own tractor. This video is for informational purposes only. Make your own decisions for your own equipment, and take responsibility for your own actions.
Special tools used in this video:
1/4" Drive Torque Wrench
amzn.to/3oDg5hy
3/8" Drive Torque Wrench
amzn.to/3ItS2tz
Magnetic LED work light (rechargeable, and sooooo nice)
amzn.to/3mkqNbp
Metric Flare Nut Wrenches
amzn.to/30bvzQH
Metric Stubby Wrench Set
amzn.to/3oCXmTm
Diesel Injection Line Socket Set
amzn.to/3yba271
EGT Thermocouple
amzn.to/3pGXjFr
Angle Drill for drilling the hole for the EGT probe:
amzn.to/3mplGXc
K-Type Probe Reader
amzn.to/3rPupWl
'Hybrid' dyno graph I show in the part 1 video
web2.netmagi.com/kubota/d1703_...
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I just completed this is modification on my L2501. I took both shims out and used three bond 1184 gasket maker to seal the pump back down. Absolutely no issues doing that. I also backed the fuel screw it half a turn. Wow, what a difference! It's quite noticeable. I did install an egt gauge and the hottest it got was 1000. I might try backing it out another quarter turn but I'm super happy with it as is. Only a tiny bit of smoke under the heaviest of loads.
Excellent video with great information that nobody else has on youtube.
I’m glad you dug into the fueling / smoke issues on these tractors. The soot is bothersome but the smell is what drives me to distraction. I have a Kubota B7000, grey market tractor (40 yrs old, owned since 1997) and the difference in smoke and smell on the same fuel is night and day better than the 2016 L2501. I was needing to find info on this same issue and looked on OrangeTractorTalk previously, while not digging too deeply.
This "Great Fix" has made a mediocre tractor a" GREAT TRACTOR". This "How to" is sure to hit a Hundred Thousand views in no time. Masterfully demonstrated ingenious modifications.Thanks for the great Video Sir and happy safe tractoring.
I was recommended to watch this video and almost didn't due to length of video. There is so much information on here and I dont even own a tractor. We actually got a Fluke infared thermometer to troubleshoot a dehydration station and was way off compared to the RTD installed, we came up with the same idea as you mentioned. Well I am looking into either a Kubota or Kioti in the 25hp or 35/39hp range. I wanted to avoid all the extra emission equipment but would a stock 25hp tractor lack with a certain application or task. My main purpose is to use the brush hog and loader on flat sandy loam dirt in 40f to 115f temperature, yes Texas weather. Great video and sure packed with info.
Just did this mod today on my new L2501. Your video made it straight forward and it went very smoothly. THANK YOU for the research and effort making the video, I wouldn't have attempted it otherwise. I couldn't tell much difference after the injection timing change, but noticed a big difference when I increased the fueling. I agree that they both go hand-in-hand together though.
That 4 bolt exhaust flange looks prime for a small turbo off a gti or other diesel Volkswagen
Thanks for documenting this. I think an LS2501 would work great on my property for road grading and bush hogging. I'd like to have one tuned by Gale Banks.
Hello, good video, we just purchased a L2501. Just subscribed. We have a MX5100 and Bobcat T650. Take Care and be safe 🚜🪵👍🏼🇺🇸
Great presentation!!!
The EGT probe is a good idea. It's what we use in aircraft where we manually control mixture for altitude.
Extremely useful information.
Great video.
It was almost as if I was watching myself fight that tamperproof cap and losing my baseline! I did the EXACT same thing. I also overcorrected and ended up with less power off the bat, then backed it out about a half turn at a time. Runs soooo much better now, no visible smoke. Been "turned up" for over a year and loving it. It does burn a little more fuel but that's no complaint.
Great job, thanks for sharing the info. baseline EGT with thermocouple would have been good, hindsight is always 20/20. Free H.P. Thanks.
Outstanding job. You are very thorough and it's appreciated.
Great Job on your video.
I just added the exhaust gas probe to mine which is still completely stock. The hottest I’ve gotten it to read so far is 890. I was not able to work it as hard as I wanted. I ran the snowblower for about an hour in deep, heavy snow, dragging the rpm’s down but I know I work it harder in the heart of winter. The outside air temperature was 45 degrees. I’m going to run it a few weeks stock and let the outside temps go up to get a solid baseline before moving forward.
I do have a Kubota L2501 with only 38 hours. I would volunteer my tractor but I live in Deltona, FL. I don't own a trailer to take my tractor to North Eastern, PA. I wouldn't mind doing it since I could visit my relatives in South Jersey.
Thanks for explaining all this in detail. It helps.