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Old 06-29-2019, 06:03 AM   #1
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Seneca M2 power uprate

I had my Cummins engine uprated recently. This was something that I found out about on this forum. 340 hp to 360 and torque from 700 to 800 ft. Took the unit into Cummins and it took them about an hour to plug into the unit and install new calibration. Total cost was $500. $365.5 for the uprate, $105.26 for labor and $14.62 for taxes.

So far so good. When driving on the highway I could apply the throttle and the unit had a noticeable acceleration. I actually thought the unit had down shifted but it was running at 1900 rpm. Before it would slowly start to pick up speed. I did not notice the unit slowing as much in the hills. Real test will be driving with the car on the dolly, I have a couple steep hill climbs around home that I could only climb at 45mph. I will time the runs up these to confirm it was worth it.

To those of you who posted on this uprate. Thanks for the information.
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Old 06-29-2019, 11:52 AM   #2
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This is going to sound silly, but here are my questions; $500 sounds reasonable. Is this something you have to find a Cummins shop for or Freightliner that services Cummins?

Also, does this void warranty (probably not an issue since we are both two years out)?

Thank you for the information. If I can get mine to stop leaning Iíll do this next.
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Old 06-29-2019, 12:16 PM   #3
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Cummins will tack on a charge for units still in the 5-year engine warranty period and still cover you as they would have before. I only had less than a year left on mine and I was familiar to them from my (former) fire department position so they waived my warranty upcharge.

If the Freightliner facility is a Cummins distributor they might be able to do the upgrade. I went right to my regional Cummins facility to get my 2014 done.
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Old 06-29-2019, 12:18 PM   #4
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Quote:
Originally Posted by RVermont View Post
Real test will be driving with the car on the dolly, I have a couple steep hill climbs around home that I could only climb at 45mph. I will time the runs up these to confirm it was worth it.
Vermont Route 7?
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Old 06-29-2019, 06:08 PM   #5
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Is the allison 2500 ok with this?
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Old 06-29-2019, 07:27 PM   #6
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Quote:
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Is the allison 2500 ok with this?
I initially had hesitation concerning the 2500. So before I had Cummins uprate my engine I talked to them (Cummins) about the transmission. They did not feel it would be a problem at all. They said that the momentary power cutback while shifting still takes place to protect the transmission during full throttle shifts. Full engine torque is available at the same time as before, just more of it!

I also mentioned it to my Allison service facility when I had my transmission reprogrammed a few weeks after my engine uprate. They also felt it was a non-issue and that the 2500 was robust enough to not be any issue. Especially in RV service instead of stop and go heavy haul service.

But I will monitor the transmission fluid carefully, I am looking into annual oil analysis to stay on top of any problems.
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Old 06-29-2019, 11:11 PM   #7
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The allison tech I spoke with said the same thing. They felt there would not be any issues with the higher input. While the power is at the top of the rated input range the reality is that a significant amount of hp and torque is lost just driving the ac, compressor, alternator and cooling fans which brings the actual amount applied to the transmission down..

Route 7 and 11/30 between Manchester and bromley mountain. This section is between 6-8% grade and really slowed the unit down.
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Old 06-30-2019, 09:29 PM   #8
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Donít forget about that long hill on I77 when you are coming out of NC into VA. That one gets me! I will be back in Charlotte in August and plan to make an appointment with Cimmins then. Did they charge you a fee for the warranty aspect?
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Old 07-01-2019, 06:50 AM   #9
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No just the $500. I simply told them what i was looking for and she typed it in the computer and told me the price. At first she said it could be a few thousand dollars which I choked on. She then looked it up and said 500.
Apparently the more hp you are adding the more they charge.
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Old 07-01-2019, 07:53 AM   #10
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Fuel efficiency

When you have a few miles on this uprate, please let us know what happens to the fuel mileage. Strongly considering this.
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