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Old 02-10-2019, 08:58 PM   #71
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Quote:
Originally Posted by Ken Thompson View Post
So, we have the whole story on the ISL. Now what about the ISC with the CAPS system?i have an 01 8.3 350 hp. And looking for safe upgrade options. Anyone know about those?
Had a 00 350 ISC and called a Cummins tuner with the approved Insite credentials and he said no official Cummins upgrade for the 350 hp engine. Same guy that upgraded my ISM and said no upgrade for the ISL 450. License to use the Insite software is about $1200 a year, so not worth it for casual use.
But to be sure he would have to plug in and see exactly what CPL you have.
https://www.cummins.com/parts-and-se...ervices/insite
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Old 02-10-2019, 09:03 PM   #72
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For engine tuning, mainly based on my gasoline engine turbo tuning knowledge, on the Cummins ISL, the ECU can be remapped to allow increased boost above and below the peak torque rpm on the engine curve while trimming the peak boost to prevent exceeding the maximum transmission torque limit. The ECU controls the turbo inlet vanes and I believe the wastgate backpressure. Where boost is added extra fuel is added and if intake temperature gets too high boost and fuel gets backed off.
Extra boost and fuel above the approx 1450 rpm torque peak raised torque at higher rpm while maintaining the peak torque. Hp being proportional to rpm x torque you increase peak hp and have a broader or more flexible or useful power curve.
The key for engine and transmission durability is to limit the peak, and if operating conditions increase temperatures to be able to respond and back off.
I have a 2005 Dutch Star 40 ft with 380 jp 1250 ft-lb torque and Allison 3000. Mines still stock but also a lot lighter than current models. The only time I could have used the extra power from tunes is going through the mountains pulling my 26 ft car trailer loades ;~)
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Old 02-10-2019, 09:07 PM   #73
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Cummins - not Cummings. That was an old TV show in the 60's.
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Old 02-10-2019, 09:32 PM   #74
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A good reliable place for those upgrades is Pittsburgh Power.
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Old 02-10-2019, 09:39 PM   #75
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Old thread on the ISC 350.
ISC HP Boost
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Old 02-11-2019, 04:34 AM   #76
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Without reading all 6 pages I may be duplicating previous information. The vast majority of diesel "tuners" will cause an increase in heat from burning more fuel. Exhaust valves begin to soften and melt at 1,350F. If you do not constantly monitor exhaust gas temperature at pre-turbo connection when climbing hills, and keep exhaust gas temp below that number you are risking destroying your engine.
Me personally, I'll not try to out-engineer the engine design engineers. The mfgrs of these tuners are not concerned with your engine longivity, only selling you a tuner.


BTW jcussen I had just bought our MH when I asked a question in that old link, that's where I learned of the issues with tuners.
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Old 02-11-2019, 08:40 AM   #77
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Originally Posted by Ray,IN View Post
Without reading all 6 pages I may be duplicating previous information. The vast majority of diesel "tuners" will cause an increase in heat from burning more fuel. Exhaust valves begin to soften and melt at 1,350F. If you do not constantly monitor exhaust gas temperature at pre-turbo connection when climbing hills, and keep exhaust gas temp below that number you are risking destroying your engine.
Me personally, I'll not try to out-engineer the engine design engineers. The mfgrs of these tuners are not concerned with your engine longivity, only selling you a tuner.


BTW jcussen I had just bought our MH when I asked a question in that old link, that's where I learned of the issues with tuners.


When playing with diesel trucks back in the day we always measured temps post turbo, if there 1350 post, there always manageable pre and no worry.
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Old 02-11-2019, 10:28 AM   #78
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We went directly to Cummings in Bakersfield, Ca. They are certified. We upgraded from 300HP to 340HP. You can go up to 360HP but we did not want to loose gas mileage.
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Old 02-11-2019, 06:45 PM   #79
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As I've read this thread, again! I wanted to clarify my reason for wanting more HP/Torque out of an ISL...

Why I want it:
-The ability to accelerate faster on freeway merging
-The ability to pass someone faster on single lane highways
-The ability to 'possibly' regain speed on a hill climb, when traffic patterns cause me to loose momentum

What I do not care about, if safe(*) additional power can be gained:
-Driving at sustained faster speeds then I do today (I'll still travel at my normal cruising speeds)
-Being to the top of the hill faster. I do feel, and have seen actual accidents and near misses. (One a few years ago on I17 North from Phoenix to Flagstaff.) That whenever a two lane, or more, each direction highway is climbing a steep grade - that the slow trucks/RV's - do add to the danger of an accident. Not from they themselves not having the capability of maintaining highway speeds - but more so from the other traffic that 'Must get around that truck, or RV...'. Lane changing, even passing in the right lane to get around some one in the left or middle lane, etc.. This is when a vehicle going 65MPH +, coming up on a vehicle going 35-45MPH, can result in a sudden impact. (In my simple mind, if I'm able to run at say 45-55MPH up a grade, the chance of me being impacted from behind is reduced.)

So most of my reasons are safety related... not wanting brag about my engine, or how fast I can go.

* I mentioned more power safely. YES TO EGT gauges... Budget this when making modifications. (And heck, even Cummins certified ECM program changes - having EGT levels known, is always a great piece of information for driving a heavier DP.

MPG? Well, I really don't care within reason. But, I'll also point out that I know of man owners with heavier coaches then I have, and larger engines, that get the same, or even better, MPG then I do. I think that it's because their combination of HP/Torque and gearing too - yield this...

OK, thanks for letting again add to the dialog!!

Best to all, be safe, have fun,
Smitty
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Old 02-11-2019, 08:26 PM   #80
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Quote:
Originally Posted by Smitty77 View Post
As I've read this thread, again! I wanted to clarify my reason for wanting more HP/Torque out of an ISL...

Why I want it:
-The ability to accelerate faster on freeway merging
-The ability to pass someone faster on single lane highways
-The ability to 'possibly' regain speed on a hill climb, when traffic patterns cause me to loose momentum

What I do not care about, if safe(*) additional power can be gained:
-Driving at sustained faster speeds then I do today (I'll still travel at my normal cruising speeds)
-Being to the top of the hill faster. I do feel, and have seen actual accidents and near misses. (One a few years ago on I17 North from Phoenix to Flagstaff.) That whenever a two lane, or more, each direction highway is climbing a steep grade - that the slow trucks/RV's - do add to the danger of an accident. Not from they themselves not having the capability of maintaining highway speeds - but more so from the other traffic that 'Must get around that truck, or RV...'. Lane changing, even passing in the right lane to get around some one in the left or middle lane, etc.. This is when a vehicle going 65MPH +, coming up on a vehicle going 35-45MPH, can result in a sudden impact. (In my simple mind, if I'm able to run at say 45-55MPH up a grade, the chance of me being impacted from behind is reduced.)

So most of my reasons are safety related... not wanting brag about my engine, or how fast I can go.

* I mentioned more power safely. YES TO EGT gauges... Budget this when making modifications. (And heck, even Cummins certified ECM program changes - having EGT levels known, is always a great piece of information for driving a heavier DP.

MPG? Well, I really don't care within reason. But, I'll also point out that I know of man owners with heavier coaches then I have, and larger engines, that get the same, or even better, MPG then I do. I think that it's because their combination of HP/Torque and gearing too - yield this...

OK, thanks for letting again add to the dialog!!

Best to all, be safe, have fun,
Smitty
Do agree, seen too many cases where a motorhome is merging onto the freeway going 40 mph, and the truckers are scrambling to get out of the right lane into the left lane so they do not have to slow down, [to many of them, slowing down is losing money].
If possible, I put a ecm upgrade or a tune on all my coaches. But also install a pyrometer as well. Exhaust gas temp will give you an immediate indication of engine overload, which you can control with your right foot and gear shifter. Modern engine and transmission ecm's are designed for the driver that does not know or care what his engine is doing and they will not allow him to damage it. If you do keep tabs on your engine pressures and temps, and learn how to control them, no problem with upgrades.
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