quote:

Originally posted by JakeW143:
Hey Billy. The guy I bought mine from had put a tuner on it and on his first trip it put the transmission in a "Limp Mode" because of the increased torque. He took it off and I would still get a check trans light on every once in a while. They claim you could get a program that tells the trans it is still stock and will work with a tuner. I just bought a new coach with an ISL 8.9 and never looked back lol.

quote:

Originally posted by BD104X:
I have a 2004 diesel pusher motorhome on a Freightliner XC chassis with a 300hp 5.9 Cummins ISB. I know they are not exactly towing powerhouses but I would like to do a tune to pick up a few more HP for towing. The motor is the same as the 5.9 in the Dodge trucks but the turbo & electronic controls are different so it's not that simple... any of you guys spark one of these up a little bit and have a tuner you can recommend that you are happy with the results? Pros / cons? Thanks in advance...

quote:

Originally posted by 50fordsst:
I have a 2000 Beaver motor home with a 300 hp Cat and was hoping to find more HP to help in the towing and looked into tuners and what it would take for a few more horses and found out that it would cause a possible over heating problem and maybe trans. problems. I found out that on the older engines like ours need a much higher Cetane (like octane) rating to operate more efficiently. In the Cat manuals it noted a Cetane rating of 48 or higher. The ratings now are 38 to 40 at all stations. I've asked at some of the stations and they answer "What is Cetane" lol. I use a cetane booster DieselKleen by Power Services silver bottle. This is not a snake oil ad for their product it really really helped in the performance. Up hills much better, cruising at 1650 rpm with less pedal. I also use top tier sources like Chevron or Shell. My 2cents

quote:

Originally posted by 50fordsst:
I have a 2000 Beaver motor home with a 300 hp Cat and was hoping to find more HP to help in the towing and looked into tuners and what it would take for a few more horses and found out that it would cause a possible over heating problem and maybe trans. problems. I found out that on the older engines like ours need a much higher Cetane (like octane) rating to operate more efficiently. In the Cat manuals it noted a Cetane rating of 48 or higher. The ratings now are 38 to 40 at all stations. I've asked at some of the stations and they answer "What is Cetane" lol. I use a cetane booster DieselKleen by Power Services silver bottle. This is not a snake oil ad for their product it really really helped in the performance. Up hills much better, cruising at 1650 rpm with less pedal. I also use top tier sources like Chevron or Shell. My 2cents

quote:

Originally posted by 50fordsst:
Out of curiosity I googled 2004 Cummins 5.9 300 hp engine cetane spec needed. 40 minimum 45+ or better recommended. If your just filling up at the cheaper outlet stations you may be getting a rating of even lower than 39. Believe me it makes a huge difference to boost it.

quote:

Originally posted by BD104X:
It's the 2000 series trans.
I replaced the exhaust with a low-restriction muffler when one of the pipes rotted through but you could look right through the old muffler and I didn't notice any difference with the new one....