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Old 02-26-2014, 09:59 AM   #1
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ISB 300 tweaking

I have a ISB 300 in my 03 Coachmen 38 class A. I'm not impressed with the stock 3.5" pretzel exhaust and air intake. As an old time trucker who owned a 03 Dodge with a hot 5.9 cummins I appreciate the benefits of big exhaust and lots of fresh air on the intake side.

Has anyone here tweaked their ISB 300 cummins with larger exhaust, air intake modifications and maybe CPU tweaks? I'm looking for a little more power and fuel mileage without breaking the bank. Love to get some feedback on this.
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Old 02-26-2014, 06:59 PM   #2
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should move to the cummins section

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Originally Posted by Paulknibbs View Post
I have a ISB 300 in my 03 Coachmen 38 class A. I'm not impressed with the stock 3.5" pretzel exhaust and air intake. As an old time trucker who owned a 03 Dodge with a hot 5.9 cummins I appreciate the benefits of big exhaust and lots of fresh air on the intake side.

Has anyone here tweaked their ISB 300 cummins with larger exhaust, air intake modifications and maybe CPU tweaks? I'm looking for a little more power and fuel mileage without breaking the bank. Love to get some feedback on this.

sure they have and there is much to read under Cummins
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Old 02-26-2014, 08:03 PM   #3
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I have a "B" and not an ISB, however, I had a 2 ft 3" piece of pipe(heat shrunk to 2.870" OD) going from the turbo to the 4" Pacbrake that I thought was restricting exhaust. I built a 4" pipe to replace it and also installed a magnaflow 4" muffler and some 4" pipe to complete the exhaust. My seat dyno sure felt better climbing the steep grades out here in the west and the exhaust temps dropped nearly 100 degrees.
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Old 02-26-2014, 09:03 PM   #4
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Mods like you're talking about are always good, except the CPU mod. Make sure you don't exceed the transmission limits. Some of the older coaches came with the 2500 Allison and it's limited on what torque it will handle.
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Old 02-27-2014, 08:46 AM   #5
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Sorry La Dagobago...new to the site...having a hard time negotiating to the right place. Too bad you didn't put in a link to where I can find "Cummins"
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Old 02-27-2014, 10:51 AM   #6
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Sorry La Dagobago...new to the site...having a hard time negotiating to the right place. Too bad you didn't put in a link to where I can find "Cummins"
Go to the main forum list and scroll down......

I get that his remark wasn't the nicest but it doesn't really need a link spoon fed to you.
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Old 02-27-2014, 05:08 PM   #7
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See cummins under forums

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Originally Posted by Paulknibbs View Post
Sorry La Dagobago...new to the site...having a hard time negotiating to the right place. Too bad you didn't put in a link to where I can find "Cummins"
When clicking RV forums then see "power train garage and find Cummins etc.
I wasn't trying to be unkind but only that there is a lot written on his ideas.

When you are on the forum you can do a search within the forum for items of interest.
Good luck
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