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Old 09-03-2013, 10:36 AM   #1
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2010 Tiffin Phaeton 42QBH powertrain

Looking at buying a 2010 Tiffin Phaeton 42 QBH with 18k miles. Powertrain is Cummins ISC turbocharged, aftercooled (360 hp, 1050 ft lbs torque) with Allison 3000MH six-speed on a Freightliner Tag Axle. Is that a good powertrain combo and is it powerful enough?
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Old 09-03-2013, 10:51 AM   #2
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A , somewhat , belated; Welcome to iRV2.
The ISC/3000 combination is common and popular.
Enough power is a personal & complicated thing . If the GCVW rating is 100 lbs per 1 HP ( you need the ratings from the coach ) that would be average power.
JMHO; If when loaded and towing , your weight is around 110 lbs per 1 HP or more ; I'd consider that underpowered.
I'm currently rolling at 102 lbs per 1HP and happy with the performance.
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Old 09-03-2013, 10:58 AM   #3
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The Cummins Frieghtliner combo is a good system. With only 18K miles it is not even broke(n) in yet. You might want to check the front axel weight. I have read some posts about some brands with tag axels overloading the front. My 42LH is fine, not even close.
Is it powerfull enough? Depends on your expectations. Will it get to the top of just about any grade in the US or Canada? Yes. Will it stay with a car? Not a chance, neither will just about all MH. I don't even try to scream up the mountains, if I need to get in line with the semis that is just fine with me; enjoy the scenery.
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Old 09-03-2013, 07:23 PM   #4
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Just depends on what you want to do with it and how fast you want to go. We've driven both a 300hp 38' Bounder and a 450hp 43' Allegro Bus to Alaska. We've pulled toads from 4000 to 6000 pounds up and down 12% grades with both rigs and each did fine. The Bus obviously goes up and down the hills somewhat faster, but all engine and 3000 transmission combos will do just fine.
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Old 09-03-2013, 07:41 PM   #5
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I had the same combo in my Phaeton, but at 36'. It was a great performing combination for the length and weight I carried.
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Old 09-05-2013, 02:09 PM   #6
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Tiffin likes the ISC in those coaches, others prefer the ISL for coaches that big/heavy.
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Old 09-06-2013, 02:06 PM   #7
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Quote:
Originally Posted by SAS2012 View Post
Looking at buying a 2010 Tiffin Phaeton 42 QBH with 18k miles. Powertrain is Cummins ISC turbocharged, aftercooled (360 hp, 1050 ft lbs torque) with Allison 3000MH six-speed on a Freightliner Tag Axle. Is that a good powertrain combo and is it powerful enough?
Seems we live in an age of more power is always better. Using that as my premise, that coach by 2010 standards, seems underpowered for a 42 foot TAG when measuring it against it's peers. On any "newish" coach over 40' I expect the HP ratings to start with a 4 or higher. Prior comments are right on tho, it will get you to the top of the hill. My comments aren't that it doesn't have SUFFICIENT power, just that it appears to be under it's peers.
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