5225 vs 5325

bairman · Sep 26, 2011

I am looking to get some more hp out of my 5225. I've been looking at the JD parts page for the 5225 and 5325, and from what I see the injectors are the only 2 things that are different for the tractors. All the parts numbers are the same except for the injectors. It looks like they both use the same turbo too. Would this mean I could change injectors to get the hp of a 5325?

cowski · Sep 26, 2011

have the pump set up 10%. that should do it.

JD3520Turbo · Sep 26, 2011

I am suprised that the injectors are even different. I figured they were the same, and that the pump was just turned up a little for the 5325.

If the injectors are different, then it could be that simple. Not sure what 5 of them cost, but they could be pretty spendy. Can you find out the rate/hr rating on both of them? That would tell you how much different they are.
Let us know what you find out.

bairman · Sep 27, 2011

I'm not sure as to what you mean by rate/hr? As for the pump set up 10%, who could I get to do this? Also when I look for the pump on the JD parts page, the only thing I can find under injector pump is the actual injectors. It shows the injectors as the injector pump. I cannot find the actual injector pump to see if the part numbers are different. How much hp gain is possible if I turned up the pump and put in the 5325 injectors?

ctlguy · Sep 27, 2011

This is a common rail style fuel system. There is no pump to turn up (well there is a pump but just a transfer pump), the fuel delivery is controlled by the rack. More shims, less shims, etc(there is more to it than that, just an ex). It is a very precise process. Good luck

fuseboxer · Sep 27, 2011

I question the turbocharger boost setting differences and many other things. Are you really after HP and not torque? With 186.1 Cu in. for both would it be possible the peak torque developes more HP at a different RPM? Could the average torque be similiar with both tractors? Go for twist not HP. I am not fond of turbo charges on cars or tractors. Superchargers I love the even boost and always "ON" with no gate. I do not know about today but in the recent past turbo charged engines cut the life of the engine. Supercharging does not effect engine life to the degree of turbo. It would be interesting to "tractor pull" to compare both tractors! Bet they both pull close.

bairman · Sep 27, 2011

So if these are fuel rail systems, and no pump to turn up, would I get what I'm looking for with just the injectors from a 5325. I want the hp and torque, so I think I would be happy with the 67hp that the 5325 produces.

ctlguy · Sep 28, 2011

bairman said:
So if these are fuel rail systems, and no pump to turn up, would I get what I'm looking for with just the injectors from a 5325. I want the hp and torque, so I think I would be happy with the 67hp that the 5325 produces.

I don't think injectors will help, but could be wrong, I certainly would be interested to know the outcome if you go ahead with it. If wanting more horsepower you are probably better served in looking at a different tractor. I do not know what to what extent the ccu has on the 5000 25 series tractors fuel delivery system if any at all. Most likely though, the ccu know's that it is a 5225 and not a 5325. Although the p/n's are the same there is a certain amount of calibration inputed into the unit once a new one has been installed (I think). 5000's are kind on the bubble here Once you get to premium 6000's and above you are completly hosed as the computers have a substantial say in what is going on internally. The advent of common rail fuel systems (as well as govt controls tier I, II, etc) has drasticly changed the old days of just walking up to the pump and turning a screw which used to be very common. Good luck

JD3520Turbo · Sep 28, 2011

The tractor itself is same chassis and trans as a 5625, so it should easily handle anything you throw at it.
If this is a common rail system, then there should be a computer or something controlling it. I didn't think these were that sufisticated. My new 5083E has a standyne pump on it.
Rate/hr is how fuel injectors are rated. Actually I think it is gallons/hr is how they are rated. Anyway, the larger the rating, the more fuel they can spray in a given amount of time.
I am sure there is much more in that engine, then what it is putting out. Need to find the right person to turn it up.

ctlguy · Sep 29, 2011

JD3520Turbo said:
The tractor itself is same chassis and trans as a 5625, so it should easily handle anything you throw at it.
If this is a common rail system, then there should be a computer or something controlling it. I didn't think these were that sufisticated. My new 5083E has a standyne pump on it.
Rate/hr is how fuel injectors are rated. Actually I think it is gallons/hr is how they are rated. Anyway, the larger the rating, the more fuel they can spray in a given amount of time.
I am sure there is much more in that engine, then what it is putting out. Need to find the right person to turn it up.

The 54-5625 was a 4 cyl engine with a rotary pump (similar to E series pump). The 52-5325 was a 5 cyl engine with the common rail delivery.