Kubota SVL95-2S Deleting the DEF System

[Mikestolarik]

Hi Folks,
In the past three years, my SVL95 has gone through three DEF injectors ($1,800) and two NOX sensors ($1400). The NOX sensors go bad because the defective injector leaking on the NOX sensor.
Besides being frowned upon by the gov, what are the pros and con when you use a "professional proven" DEF delete kit? I found a Kubota dealer that said they would still work on it if the DEF system is deleted properly.
Update: I discovered that if the intercooler has debris built up between the vines, this will cause the machine to consume a considerable increased amount of DEF. in my case it increased the level of DEF usage to 2 gallons per 8 hours of vegetation mulching.

 

[The Evil Twin]

Operatiomally, there are no cons to circumventing that system on any diesel. None that I have ever heard of. The cat pee dose is the only problem I have ever had with any of mine.

 

[GreensvilleJay]

my opinion...
sounds like defective parts or bad design, that Kubota should be paying the bills on.
There are probably MILLIONS of vehicles with DEF systems in the USA alone, that do NOT need parts replaced after 3 years.
BTW, the 'computer' should have detected that bad sensor and either put engine into a safe 'limp' mode or 'no start' condition to PREVENT any damage.

 

[lugbolt]

i'll offer what I know, and yall can use it for whatever it's worth. I ain't trying to talk anyone out of doing it, by the way, but I'm also not condoning "deleting" them.

Removing the devices requires a custom tune that will allow for a safe operation of the engine. "Safe" meaning the engine won't burn itself down, EGT won't get too high, nor too low, yet still make acceptable power (close to stock power level). The issue is this. The OEM's know what the tune is, they spend BILLIONS in hiring the real professionals (teams) to develop a program that works within all of the many constraints they have to work with. The development process costs a lot of money in all of it's many aspects, which is one of many reasons the replacement parts cost what they do. Now, consider this. Some "hack" (I'll use the term loosely, with respect because I cannot do what these guys can do) develops a "tune" that will "delete" the functions of the devices, yet they might miss the injector timing by 0.5 degrees, which results in a burned piston over time, or whatever. Remember, they are specifically built to work WITH the devices, and removing the devices also changes how the engine operates, which some of the tuners attempt to "correct"-sometimes with unintended results. And remember there is no warranty on these "tuners" either. Gale Banks did a Youtube segment on this recently (or--I recently saw it anyway) which reiterated what I've known for years/decades. You gain in one area (removal of the devices) but may lose elsewhere. So what am I saying? Be careful....that is all.

 

[Mitjam]

i'll offer what I know, and yall can use it for whatever it's worth. I ain't trying to talk anyone out of doing it, by the way, but I'm also not condoning "deleting" them.

Removing the devices requires a custom tune that will allow for a safe operation of the engine. "Safe" meaning the engine won't burn itself down, EGT won't get too high, nor too low, yet still make acceptable power (close to stock power level). The issue is this. The OEM's know what the tune is, they spend BILLIONS in hiring the real professionals (teams) to develop a program that works within all of the many constraints they have to work with. The development process costs a lot of money in all of it's many aspects, which is one of many reasons the replacement parts cost what they do. Now, consider this. Some "hack" (I'll use the term loosely, with respect because I cannot do what these guys can do) develops a "tune" that will "delete" the functions of the devices, yet they might miss the injector timing by 0.5 degrees, which results in a burned piston over time, or whatever. Remember, they are specifically built to work WITH the devices, and removing the devices also changes how the engine operates, which some of the tuners attempt to "correct"-sometimes with unintended results. Gale Banks did a Youtube segment on this recently (or--I recently saw it anyway) which reiterated what I've known for years/decades. You gain in one area (removal of the devices) but may lose elsewhere. So what am I saying? Be careful....that is all.

Very well put. I agree with you 100%. I have thought about deleting my m6-111 but I am lucky to have got over 3700 trouble free hrs out of it. Although I think my dpf is starting to plug which I realize it is probably at its service life.

 

[Mitjam]

Hi Folks,
In the past three years, my SVL95 has gone through three DEF injectors ($1,800) and two NOX sensors ($1400). The NOX sensors go bad because the defective injector leaking on the NOX sensor.
Besides being frowned upon by the gov, what are the pros and con when you use a "professional proven" DEF delete kit? I found a Kubota dealer that said they would still work on it if the DEF system is deleted properly.

When I had my svl95 I had the same problem. Only had 300 hrs. Service manager said it was a problem with those machines the def tank is so close to the hot engine, cause the def to crystallize and wreak havoc. I sold the machine and the problem was fixed under warranty but does make you wonder