Z-Michigan
Veteran Member
wolc123 said:
I got that from a brochure for the 4x20 series I picked up last December. Maybe they used to offer that option and don't any more?
"Upgrading" 4X20 Series
- Thread starter ChrisJD4320
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I got that from a brochure for the 4x20 series I picked up last December. Maybe they used to offer that option and don't any more?
I have been told by a local dealer that the difference is in boost pressure.
He couldn't tell me more, but I might suspect that there is a boost guage in the system somewhere that reads boost and adjusts the fuel pressure to compensate to add power.
If there is a compensator, it's a "simple" case of either adding more boost by modifying/changing/adjusting the turbo.
If there is no compensation there is CLEARLY an adjustment on the fuel pump to boost pressure (more fuel).
The catch is the turbo.
If the turbo is variable vane (unlikley) then you can modify the computer to add boost.
If it's a static vane, then NO AMOUNT of computer modification will do anything. You MUST mofidy the turbo itself.
He couldn't tell me more, but I might suspect that there is a boost guage in the system somewhere that reads boost and adjusts the fuel pressure to compensate to add power.
If there is a compensator, it's a "simple" case of either adding more boost by modifying/changing/adjusting the turbo.
If there is no compensation there is CLEARLY an adjustment on the fuel pump to boost pressure (more fuel).
The catch is the turbo.
If the turbo is variable vane (unlikley) then you can modify the computer to add boost.
If it's a static vane, then NO AMOUNT of computer modification will do anything. You MUST mofidy the turbo itself.
Kyle_in_Tex
Super Star Member
I would think reprogramming the chip would be a start. If you go to Nebraska tests, you'll see boost goes up about 2lbs per model. But with more boost, you need more fuel. So, its more than 1 thing....Haven't checked to see if the same exact model of hydro tranny is installed in all 4 models.
AJDNUT
New member
There are programs available from different manafacturers that make power programmers for trucks available on the market for a few of the larger machines. I am not aware of any for the compacts or utilities.
I will bet though just like with the programs for the trucks you will need to off load the program before taking the unit in for service or warranty work. Additionally these units will code like an automobile and if an issue is recognized as being at all related you will suffer a loss of warranty on that issue. However, that wouldn't stop me, and never has on any of my trucks.
I will bet though just like with the programs for the trucks you will need to off load the program before taking the unit in for service or warranty work. Additionally these units will code like an automobile and if an issue is recognized as being at all related you will suffer a loss of warranty on that issue. However, that wouldn't stop me, and never has on any of my trucks.
Can anyone report on what turbo is in a 4120, 4320 or a 4720.
I swung by the dealer and they had a couple 45's, but that was all. It was wearing a teeny tiny Borg Warner unit. I wrote the model down but of course the BW website doesn't mention it by name nor do they really get into any specifics of the unit.
Of course I was in a hurry and wasn't smart enough to actually LOOK at the unit to determine if it was a variable geomerty unit or not.
Either way, if someone can tell me what one of the other tractors is wearing, then we'll have an answer pretty quickly.
I swung by the dealer and they had a couple 45's, but that was all. It was wearing a teeny tiny Borg Warner unit. I wrote the model down but of course the BW website doesn't mention it by name nor do they really get into any specifics of the unit.
Of course I was in a hurry and wasn't smart enough to actually LOOK at the unit to determine if it was a variable geomerty unit or not.
Either way, if someone can tell me what one of the other tractors is wearing, then we'll have an answer pretty quickly.
Z-Michigan
Veteran Member
Several months ago there was another thread on this same topic and someone reported that they had looked up the parts numbers from JD for every part of the engines in the 4x20 series and every last part was the same. Might be worth digging for that thread. I believe only the computer setting differs.
Z-Michigan said:
Yes, I recall that thread.
"Every" part can't be the same. For example: If it's a simple computer setup change, then the program on the computer will have a different part #. Granted, it might not be a part #, but there has to be evidence somewhere.
I'll know about the turbo by Sunday (hopefully) when my 4720 arrives. I'd have just assumed buy the 4120 in hopes of upgrading it, but a deal presented itself!
CWP37
Gold Member
This thread inspires me. I'm selling my old 2WD 5103 and looking to get a new model 4WD 5103. Only problem is that the new 5103 is a drop in hp and pto hp. That bumps me up to a 5203 (JD marketing trick).
You guys seem to know your stuff a lot better than I do. Can I but a 2008 4WD 5103 and have someone kick up the hp for me?
You guys seem to know your stuff a lot better than I do. Can I but a 2008 4WD 5103 and have someone kick up the hp for me?
RollTideRam
Veteran Member
Has anyone contacted tsperformance.com ? They have been making upgrades for diesel trucks for years. They have an ad on the back of the Tractorhouse book I got a few weeks back for their Agripower Series tuners. Maybe for bigger tractors but may be worth contacting. They offer these for Case IH, Deere, Cat, Agco, NH, MF, Gleaner, Valtra. JC
It's possible someone will decide to get into the compact market.
The TS Performance guys didn't do anything special, they simply ported their codes over to the ag equipment that uses standard typical commercial motors.
I have a feeling that on the CUT units, JD is (actually) building and designing their own motor and as a result not letting the details out in the open because they don't have to. With a Yanmar motor the details get out in the open because there are no Yanmar dealers where you go to get your stuff fixed. On the other hand, the Yanmar motors might not offer enough headroom in each series to warrant attention. I don't know.
What I CAN say, is that in regards to the 4x20 series.. they all have the same turbo and it's NOT a variable vane. The part numbers are the same, at a mininum they are the same between the 4320 and the 4720. Same model and part #.
It is possible that they pump is simply turned up. With a diesel, in many cases, you can create a motor, add a ton of boost and then the HP is controlled by the fuel flow.
For example, in the early 90s VW took a N/A diesel and simply added a turbo, they got about 5-8 more HP and a bunch of torque, plus it burned cleaner. Take that same motor, and add fuel and the HP goes up.
*I* suspect that is exactly what is going on here. The turbo is a static vane and the same across the line. Which means boost is the same. But if the 4120 has a tuned back fuel pump, you get less HP, turn up the pump and you get more HP and a "different" model.
The TS Performance guys didn't do anything special, they simply ported their codes over to the ag equipment that uses standard typical commercial motors.
I have a feeling that on the CUT units, JD is (actually) building and designing their own motor and as a result not letting the details out in the open because they don't have to. With a Yanmar motor the details get out in the open because there are no Yanmar dealers where you go to get your stuff fixed. On the other hand, the Yanmar motors might not offer enough headroom in each series to warrant attention. I don't know.
What I CAN say, is that in regards to the 4x20 series.. they all have the same turbo and it's NOT a variable vane. The part numbers are the same, at a mininum they are the same between the 4320 and the 4720. Same model and part #.
It is possible that they pump is simply turned up. With a diesel, in many cases, you can create a motor, add a ton of boost and then the HP is controlled by the fuel flow.
For example, in the early 90s VW took a N/A diesel and simply added a turbo, they got about 5-8 more HP and a bunch of torque, plus it burned cleaner. Take that same motor, and add fuel and the HP goes up.
*I* suspect that is exactly what is going on here. The turbo is a static vane and the same across the line. Which means boost is the same. But if the 4120 has a tuned back fuel pump, you get less HP, turn up the pump and you get more HP and a "different" model.
