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Old 02-13-2020, 03:02 AM   #15
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First of all the 6 speed Alison is a great transmission. It has an economy mode that I rarely use since 75% of my driving is in mountains. Last year I had the transmission fluid changed to synthetic.

I push my ISB very hard and have 175k on it. I like to avoid the interstate. I go over White Pass (US-12) 4 times a year. There are stretches where 35 mph are as fast I go. Oh wait that is in my Civic. Four RV that I can see in front of me. On one steep grade, I was stopped for road construction and could only get to 25 mph from a standing stop.

More later, got to go!
Thanks for the positive message. I'm praying that all is well with my trans and motor. We'll take it our for a shake down trip in a few weeks. 1st I must figure out why the warning beeper is on even though the leveling jacks are up. I'm gonna check the fluid in the system to see if it's low.
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Old 02-13-2020, 03:10 AM   #16
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Back from active grand parenting.

Depending on how dirty my radiator is and the length of the climb, I can expect the check engine light to come on but it does not get to the 'limp' mode.

You will want to read some of the post about cleaning a rear radiator.

My 275 HP 24 valve ISB has a Banks power pack put on by the first owner giving it 300 HP.

Every time you go up and down a hill, you put a thermal stress on the engine. I am having my exhaust manifold replaced with a performance enhancing one next week because of a 360 degree crack in the one with 175K miles. Not an uncommon problem as the miles pile on under heavy loads.

The new exhaust manifold is twice as expensive as my OEM part which I can no longer get from Cummins. I am not doing it for performance but because this part will handle the thermal stress better.


So I have been hanging around listening to hard core diesel performance guys.

Better than a reality TV show! I keep hearing them explain to not increase performance past design limits of the engine and other components.

Any any case your 4 year newer engine may already benefit from improvements made from my 275 hp version.

I am also have a second lift pump installed closer to the fuel tank. Again this may already be done on yours.

I have previously installed a fuel pressure gauge before the injector pump which are expensive to replace.

These are things to ask about if you are looking at having work done.

My recommendation is to do nothing until you have a few short trips under your belt. With my 40,000 miles I have been happy with performance and added a civic on a tow dolly.

My newbie mistake on the first MH was tires aging out. Blew a rear tire in west Texas passing a truck going up a grade. I like to keep the speed to 65 mph but the truck sped up. First time up to 70 and had a bad sound. The next exit was a dirt road with cattle guard. Tire on the other side had a bulge the size of a grape fruit.

What I have learned in five years of being full time is that no one in the world has the skill to dive a MH with too much hp when something goes wrong. It is just physics.
Wow, quite a story! Yes, tires are on the top of the list as far as checking them out, finding out how old they are by the date code, and replacing them if necessary. I guess, in a way, I was lucky to find this particular unit as shortly after the previous owner bought it he sank 11k into restoring it but then needed to sell it for what he describes as "medical issues". He put in a new radiator, AC parts including dryer and a bunch more miscellaneous items. Looking forward to a proper test ride over a long weekend so I can test the driving and internal systems as well. So far all we've done is fire up the lp generator and make sure it powers up the internal appliances and roof AC unit.
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Old 02-13-2020, 03:19 AM   #17
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Cummins did not produce the 6.7L ISB until 2007, so your 2002 motorhome must have the 5.9L ISB. No need to call Cummins for verification.


You should, however, get verification on the transmission as stated, above. A 3000 series will handle a power/torque increase, but a 2500 may not. Do this if you are seriously considering a power increase.


In general, you have a relatively small MH at 34' and it appears to be similar to one of my previous coaches that had the 300 hp ISB. Mine, however, had the Allison 2500 five speed transmission, but I found it adequate for the job. Yes, some steep or long grades were climbed slowly, but never had an issue with overheating as long as down shifting was done to keep the RPMs in the proper range. These grades were done pulling a toad as well.



I met someone at a campground that had the exact same coach as mine, and he had installed the Banks system. He had just returned from a trip to Alaska and felt it was well worth it and he noticed an improvement in performance. He did mention that there can be some "glitches" associated with the Banks retrofit, but that a local diesel expert had done the install and all went well from the get-go.
Thank you, Larry. I learn a little every night as I stay up and read through the encyclopedia sized manual and peruse the accordion folder filled with manuals on all the various accessories in the coach. I found out that the model is a 32PBD. There's still a ton of stuff to learn and get familiar with. I need a vacation to sit and read all this information and learn more about owning a DP. Can you physically hear the exhaust brake working from the drivers seat? I tried mine on the last drive from home to the storage place but it didn't seem to have an effect on slowing the coach down and I couldn't hear the tell tail sound I'm used to hearing when others apply their exhaust brake. Maybe it's not working? I'll look into it this Sunday. Anyway, thanks for your reply.
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Old 02-13-2020, 09:43 AM   #18
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Thank you, Larry. I learn a little every night as I stay up and read through the encyclopedia sized manual and peruse the accordion folder filled with manuals on all the various accessories in the coach. I found out that the model is a 32PBD. There's still a ton of stuff to learn and get familiar with. I need a vacation to sit and read all this information and learn more about owning a DP. Can you physically hear the exhaust brake working from the drivers seat? I tried mine on the last drive from home to the storage place but it didn't seem to have an effect on slowing the coach down and I couldn't hear the tell tail sound I'm used to hearing when others apply their exhaust brake. Maybe it's not working? I'll look into it this Sunday. Anyway, thanks for your reply.

Yes, you should be able to hear the exhaust brake as well as feeling the slowing. My former coach had the exhaust brake and it responded immediately when the accelerator was released. Note, however, the brake can be programmed to respond differently but still, there should be a noticeable slowing. You should have your system checked out for function. It may simply need a bit of lubrication or electrical connection repair.



My current coach has the two stage engine brake. The noise is almost non-existent, and the braking is not as abrupt as the exhaust brake was.
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Old 02-13-2020, 11:22 AM   #19
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I have a 38 Dp with the 275 hp 5.9 towing a car on a dolly. My friend has a 40 foot Dp with the 300 hp 5.9. He pulls a full size dodge diesel pickup. Neither has any lack of power. Having the 300 hp in a 32 ft coach, I wouldn't expect it to be lacking too much power. To each their own, but I wouldn't re-engineer the product. It was engineered the way they designed it. Sometimes modifying things doesn't always give the desired results. As far as cooling goes, make sure to check in between the rad and air cooler. They have been known to get plastic bags and lots of crude in between there. I would consider this a priority over raising the hp.
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Old 02-13-2020, 11:50 PM   #20
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1st I must figure out why the warning beeper is on even though the leveling jacks are up. I'm gonna check the fluid in the system to see if it's low.
So soon we forget the easy to solve problems. My '96 32' HR gasser and my present MH had different control systems but similar components. So I would not be surprised if your system is different.

The first step in trouble shooting all the fuses. At least the ones you can find.

You need hearing protection for my 'buzzer'. It was not an initial problem until I found the blown fuse. The buzzer was so loud that it resolved itself by blowing the fuse again.

I check visually that the jacks are up, antenna down, and wife on board.

While I am at it let me share another work around. A BIRD controls changing the house battery when going down the road. I use a beer cap under the 'aux start' switch.
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