X-15 Cummins thread

I wouldn't recommend the efficiency series. This one a 2019 has a persistent problem with low power and a miss that causes the computer to cut power under boost above 22 lb. 9 visits back to the dealers shop, wasted time,wasted money.

 

My performance 525/1850 seemed to have little power when I first got it. Now I have 32k on the OD and she seems to be getting stronger.

 

I'm driving a 2018 W860 Volvo 13 speed with the X15 performance in it. 145968.6 miles on it. I have been driving roughly about 17 years my 1st truck I ever had was an old B model Mack We used hauling gravel when I was a Kid. Out of all the engines I have driven in the Nineties I enjoyed the C15. But to be honest we have went through a lot of junk until now I really like this X15 performance motor. I'm a produce hauler so I almost Max out 80k Every load and Keep this motor roaring I get about 5.6 miles per gallon My average because of idling so long at truck stops and receivers in shippers that's just the nature of being a produce hauler. I don't have AAPU on the struck although I probably should get one but so far this has been 1 of the most reliable engines I have driven in a long time so if you want to ask me about the performance engine I think it is great I don't know about the efficiency engine so I've heard they have been quite problematic and that is unfortunate. I think that Cummins has finally hit the head of the nail with this motor So far it has performed better than I expected especially after the fuel pump issues with the ISX. The motors I have driven have been the Detroit 92 silver Detroit 60 series all Volvo Mercedes the big cam Cummins Non Turbo and Turbo for that matter and N14. Every cat engine you can think of And even that little Mercedes that they pushed out for a while. I have been doing this a long time but I feel like right now that the X15 is the best performing engine on the market as of today. We have been needing reliability for quite some time ever since the C15 has left the market and the older 60 series. I can finally say it is nice to have a breath of fresh air not having to worry about something stupid like we've been doing in the past but with that being said only time will tell me more about this engine but so far it has done everything I have wanted just like the old C15 done.

 

Lmao kid where I at I need some entertainment

 

Lol

 

Got the same sound going on, like a faint fog horn. It's kind of annoying but what ya going to do.

 

Sounds like your hearing VGT move to increase pressure when it's idling.

I guess that's kind of the sound you could say my ISX makes when it does it's thing.

I hear other ISX's make the same sound.

It's not constant.

 

Anyone have issues with weak jake performance? Mine is seriously weak, as in reminds me of a 3406E. It's a 389 with 565/2050 turned down to 485/1850.

Otherwise it runs great, and fuel mileage is great, consistently 6.5mpg pulling very light loads. Because of the light duty this truck does the weak jake isn't a huge issue but I kept hearing how incredibly strong it's supposed to be, so something isn't right.

I spoke to the dealer about it, they said there have been some other cases of this and they're not sure what the fix is. With one (a 500 Efficiency series) Cummins told them to replace the turbo, and it made no improvement. They then did a software update, and they have not heard back from the customer since (it's been a couple weeks) so they don't know if it's resolved or not.

They did the software update on mine and bobtailing it home, it doesn't really feel any stronger than before so I don't think it's fixed. Anyone else dealt with this or know what the fix is?