L2501 Turbo: A Journey Defined - The tractor, The comparison, The modification, The results...

[Hahnsolo]

Thanks Mike. I’ve come through a second winter with the turbo conversion on my B2650, and while it’s doing well, I think I’m leaving some horsepower on the table. This year I am planning to experiment with tuning.

This is cool that your kits are starting to find there way into other machines. It adds to the growing database of knowledge that had been lacking for a long time.

Solo

 

[Rdrcr]

Thanks Mike. I’ve come through a second winter with the turbo conversion on my B2650, and while it’s doing well, I think I’m leaving some horsepower on the table. This year I am planning to experiment with tuning.

This is cool that your kits are starting to find there way into other machines. It adds to the growing database of knowledge that had been lacking for a long time.

Solo

You’re welcome.

What we’ve found, is that there isn’t a particular fuel setting that will work to maximize power and performance on every tractor. We believe this is mainly because of the varying tolerances of the injection pumps themselves and the injection pump installation at the factory (some have shim(s) and some don’t), in addition to possible modifications made by the tractor owner prior to the Turbo Kit installation. Moreover, elevation plays a crucial role in determining fuel settings as well. Each setup is different.

We still have customers operating their Turbocharged tractors on factory fuel settings and ones that are turning up the fuel as much as possible to achieve maximum performance.

I’m sure you’ll find that perfect setting with additional experimentation. The key is to monitor your EGT’s and make sure you’re operating safely.

Mike

 

[Hahnsolo]

Yup, I kinda figured there’s no one magic fuel setting for all tractors. The trick on mine is finding the fuel adjustment screw, as it is not in the same place as the 2501. That will be this year’s project before the snow flies again in fall.

 

[AOW162435]

Mike,
Absolutely phenomenal write up, follow up & results. Very, very cool to see that these kits are out there and performing as designed.
I just purchased a new LX2620 this month and have already been making modifications, deletions, additions and changes. The thought of eventually adding one of your kits (should you find yourself developing one for this model) is quite intriguing.


Andreas

 

[Hahnsolo]

Hi AOW162435:

Mike has been very successful with his turbo kits and are an excellent product. Two years ago he was also instrumental in guiding me through my own turbo modification on my B2650, which coincidentally, uses the same engine as your new machine (D1305-E4).

If you’re interested, you can follow the project at the following link:

The B2650 Project: Turbo Edition

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www.orangetractortalks.com

Solo

 

[Rdrcr]

Mike,
Absolutely phenomenal write up, follow up & results. Very, very cool to see that these kits are out there and performing as designed.
I just purchased a new LX2620 this month and have already been making modifications, deletions, additions and changes. The thought of eventually adding one of your kits (should you find yourself developing one for this model) is quite intriguing.


Andreas

Thank you!

Yes, the Turbo Kits are performing exceptionally well for tractor owners looking for additional performance for their specific operating needs.

We will be looking at developing a Turbo Kits for the LX2610 / LX2620. My inbox has plenty of requests. Right now we are focusing on the L2502, Kioti CK2610 / CK2620 (Bobcat CT2025), and L3240.
That said, if anyone wants a Turbo Kit developed for their tractor and can get that tractor to us (WA or CA) we can get a Turbo Kit going assuming scheduling is available. But, we’ll need your tractor for a week or two during peak operating season (June / July / August) because that’s our non-busy time and for those L2501 guys still on the Turbo Kit waitlist, the best opportunity to get a Turbo Kit quickly.

Mike

 

[Rdrcr]

The Kubota L3240.

Mike

 

[AOW162435]

Nice!

Andreas

 

[Rdrcr]

Turbo brothers

Mike

 

[JohnDB]

The Kubota L3240.

[Photos]

Mike

Love the plumbing, beautiful!

 

[Sidekick]

Beautiful job. Can't wait to see the one for a Kioti CK2620.

 

[Rdrcr]

We had a successful day at the dyno with the L3240. The L3240 Turbo was able to match my L2501’s 44 HP / 35 PTO HP.

However, the owner of the tractor wanted to keep EGT’s well below 1,100 degrees and settled on a fuel setting of 1 1/2 turns which produced 33 PTO HP.

It was great to see how small incremental adjustments in the fuel settings affected performance while on the dyno.

Overall, the L3240 and Turbo Kit performed flawlessly and provided incredibly consistent performance throughout the testing and dyno session. We’re very pleased with the results and the customer is extremely happy!

Mike

 

[Rdrcr]

Perhaps the HST+ allows you to hear the Turbo a bit better than the L2501. Here’s a quick video we put together with some cool Turbo sounds:

Mike

 

[biketopia]

I love this thread and have been following along with Hahnsolo on his journey with the B2650, as I have the same tractor. I'd kind of like to one day do the same for the additional PTO power. The size of the tractor is great for me, but some additional umph for the PTO could be a welcome addition.

 

[PaulL]

Interested the L3240 wouldn't put out quite a bit more power than an L2501, since stock they have quite a difference in power. It looks like same engine, but the L3240 is running 2700 rpm?

 

[Rdrcr]

Interested the L3240 wouldn't put out quite a bit more power than an L2501, since stock they have quite a difference in power. It looks like same engine, but the L3240 is running 2700 rpm?

Excellent question/observation!

First though, please keep in mind this particular L3240 customer wanted a very safe fuel setting. He wanted to keep his EGT's below 1,100 degrees in the most demanding situations. Even the dyno operator was asking for more fuel because he knew the L3240 had more to give.

We have a theory though. We think it is more about the injection pump timing than RPM. The L2501 and L3240 share the same D1703 engine (with the exception of some extremely minor differences like a slight change in valve angle, for example). The L3240's D1703 has Tier 2 emissions and injection timing of 19 Deg BTDC and has a 32HP rating. The L2501's D1703 has Tier 4 emissions and injection timing of 5 Deg BTDC and has a 25HP rating. An L2501 with the 'injection pump timing' modification is estimated to produce 31HP.

I'm starting to lose track by we've had five or seven S2T Turbo L2501's dyno'd and matched my tractors power output of 44/45HP and 35 PTO HP. Two of the Turbo L2501's had the 'injection pump timing' modification. Originally we thought the injection pump timing mod would increase power output with the Turbo but, it has not. Those tractors are making the same power as Turbo L2501's with the factory injection timing and as we now have experienced with the Turbo L3240. Why? We think that advancing the injection pump timing not only advances the fuel injection timing but, by removing the pump shims (which is necessary to advance the timing) also increases the travel of the cam which would also increase the potential fuel volume per cycle. We're seeing EGT's rise faster with the advanced injection pump timing making EGT's a bit more difficult to control and potentially limiting the amount of fuel that can be added to maintain safe EGT's. Ultimately, it is starting to make the case to keep the fuel timing retarded (stock) when planning on the Turbo upgrade.

Mike

 

[PaulL]

My understanding was that in order to meet Tier 4 (or, more accurately, stay below the HP threshold where you're required to meet more stringent emissions standards) they both lowered the max RPM substantially and retarded the timing.

Lower RPMs, because power = rpm x torque. It's making similar torque to the L3240, but since it's locked to lower RPM, it makes less power. And retarded timing I can't recall the reason for.

You got great power from it with low RPMs, which must mean it's making monster torque. On paper, the L3240 should be able to make the same torque, and therefore the same power at 2200 RPM. But since the PTO is geared for 2700 RPM, you should be able to get another 20-30% power at 2700 RPM. At least, that's what my rough maths says.

 

[Rdrcr]

^^^^
I firmly believe that if the L3240 had the same fuel setting as my L2501, it would have made more power at 2700 RPM. The dyno operator and I were in favor of bumping the fuel setting but, the owner wanted to keep things very very safe.

Mike