Are you a Big-Rig Hypermiler ?...
05-12-2020, (Subject: Are you a Big-Rig Hypermiler ?... ) 
Post: #28
RE: Are you a Big-Rig Hypermiler ?...
(05-12-2020 )Paccardude Wrote:  Hi All,

I have an isx15 2350 engine. I'm not sure what's going on with the acceleration from 9th to 10th gear. 9th gear won't climb past 1500 rpm and change to 10th gear it falls back to 110p - 1200 rpm and lugs the shi#t out of the engine before getting back over 1450 rpm. I have Cummins insite is there a vid or does someone know how to change the parameters so 9th can climb over 1500 rpm before shutting off, and accelerate quicker in 10th with less speed? 10th gear is only 1500 at 70-75 mph and and 13 at 65. I'd like to be at 65 max speed but 1500 rpm. Hope this makes sense and any help would be most obliged.

Mine is the same. Only goes past 1500 for a few seconds when pulling a hill. I have insite but don’t know what to mess with. Don’t want to mess things up
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05-13-2020, (Subject: Are you a Big-Rig Hypermiler ?... ) 
Post: #29
RE: Are you a Big-Rig Hypermiler ?...
Grow some balls, do some reading, ask some questions and get rid of your problems. Stop being paralyzed by a lack of knowledge. We were all there.... until we decided not to be.
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 Thanks given by: Rawze , the missing link , dhirocz
05-15-2020, (Subject: Are you a Big-Rig Hypermiler ?... ) 
Post: #30
RE: Are you a Big-Rig Hypermiler ?...
(05-12-2020 )Zondo956 Wrote:  
(05-12-2020 )Paccardude Wrote:  Hi All,

I have an isx15 2350 engine. I'm not sure what's going on with the acceleration from 9th to 10th gear. 9th gear won't climb past 1500 rpm and change to 10th gear it falls back to 110p - 1200 rpm and lugs the shi#t out of the engine before getting back over 1450 rpm. I have Cummins insite is there a vid or does someone know how to change the parameters so 9th can climb over 1500 rpm before shutting off, and accelerate quicker in 10th with less speed? 10th gear is only 1500 at 70-75 mph and and 13 at 65. I'd like to be at 65 max speed but 1500 rpm. Hope this makes sense and any help would be most obliged.

Mine is the same. Only goes past 1500 for a few seconds when pulling a hill. I have insite but don’t know what to mess with. Don’t want to mess things up

Delete the ECM value for gear down protection, like Rawze said. The shifting is like a dream. 9th gear can go from 45 to 65 now 65 around 1800. Although, I am curious as to why they set the specs the way they did... Not a response as like they are f**k tards. Did they think the driver would not pay attention and run over 2000 RPMs in 9th, or was there problems with the designs of the isx15, that they thought it would be better to set the gear down at 55 and 71??


User's Signature: We're a full grid off.
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05-15-2020, (Subject: Are you a Big-Rig Hypermiler ?... ) 
Post: #31
RE: Are you a Big-Rig Hypermiler ?...
(05-15-2020 )Paccardude Wrote:  
(05-12-2020 )Zondo956 Wrote:  
(05-12-2020 )Paccardude Wrote:  Hi All,

I have an isx15 2350 engine. I'm not sure what's going on with the acceleration from 9th to 10th gear. 9th gear won't climb past 1500 rpm and change to 10th gear it falls back to 110p - 1200 rpm and lugs the shi#t out of the engine before getting back over 1450 rpm. I have Cummins insite is there a vid or does someone know how to change the parameters so 9th can climb over 1500 rpm before shutting off, and accelerate quicker in 10th with less speed? 10th gear is only 1500 at 70-75 mph and and 13 at 65. I'd like to be at 65 max speed but 1500 rpm. Hope this makes sense and any help would be most obliged.

Mine is the same. Only goes past 1500 for a few seconds when pulling a hill. I have insite but don’t know what to mess with. Don’t want to mess things up

Delete the ECM value for gear down protection, like Rawze said. The shifting is like a dream. 9th gear can go from 45 to 65 now 65 around 1800. Although, I am curious as to why they set the specs the way they did... Not a response as like they are f**k tards. Did they think the driver would not pay attention and run over 2000 RPMs in 9th, or was there problems with the designs of the isx15, that they thought it would be better to set the gear down at 55 and 71??

it is to prevent the company drivers form utilizing full output power of the engine.


User's Signature: ->: What I post is just my own thoughts and Opinions! --- I AM Full Of S__T!.
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02-09-2021, (Subject: Are you a Big-Rig Hypermiler ?... ) 
Post: #32
RE: Are you a Big-Rig Hypermiler ?...
I worked with U S Xpress in a 2016 International prostar sleeper with the isx 15 and auto transmission. I personally put 180k miles on that truck and not once did I break down and didnt know why until Rawse said it in his video. I made that truck get on it every where I went and back down once I was back flat when I went up a hill 1800 rpm was where I was and manually shifted it I didnt pamper it nor was I abusive you find that right spot with a diesel. I averaged 9 to 10 gpm as a company driver. You might say bulls### but a lot of what he said is the truth. Maintenance and how you drive it determine a lot. Thank You Rawse for your insight on the cummins isx and will continue to be a member.
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 Thanks given by: Waterloo
03-03-2021, (Subject: Are you a Big-Rig Hypermiler ?... ) 
Post: #33
RE: Are you a Big-Rig Hypermiler ?...
(05-12-2020 )Zondo956 Wrote:  
(05-12-2020 )Paccardude Wrote:  Hi All,

I have an isx15 2350 engine. I'm not sure what's going on with the acceleration from 9th to 10th gear. 9th gear won't climb past 1500 rpm and change to 10th gear it falls back to 110p - 1200 rpm and lugs the shi#t out of the engine before getting back over 1450 rpm. I have Cummins insite is there a vid or does someone know how to change the parameters so 9th can climb over 1500 rpm before shutting off, and accelerate quicker in 10th with less speed? 10th gear is only 1500 at 70-75 mph and and 13 at 65. I'd like to be at 65 max speed but 1500 rpm. Hope this makes sense and any help would be most obliged.

Mine is the same. Only goes past 1500 for a few seconds when pulling a hill. I have insite but don’t know what to mess with. Don’t want to mess things up

My 2012 ISX was the same. Last time it was in the shop I had them turn the Load Based Speed Control off.
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