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Old 03-29-2012, 09:15 AM   #43
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We have owned several of both gassers and DPs and concur with those who say that if you can afford it to strongly consider a DP for the size of RV you are contemplating. One other note for you. If you will be pulling a toad behind you, be sure you get a DP with at least a 300 HP engine. Our DP now has 350 HP and barely slows down on even the steepest grades while towing our toad. Formerly owned 2 275 HP DPs and both struggled considerably on steeper grades and we had to really pay attention to the engine temperature when pulling steeper grades in warm weather. Our 350 Cummins engine temperature barely rises at all no matter what the outdoor temp or the grades we are pulling. Good luck and hope you enjoy whichever rig you end up buying.
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Old 03-31-2012, 08:51 AM   #44
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All I can say is that my 2008 with Vortex 8.1 and 6 speed Allison is the best. I can't go anywhere that I avoid the Smokies. The Allison has "Grade Brake" it is like magic on the desent, no brake pedal pressure, and I will pass all the Semis on the way up. My brother-in-law couldn't keep up with his F-350 diesel hauling a 5th wheel. Now the bad news, they don't make the Workhorse Vortex system anymore. I can only hope it will come back before my next MH
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Old 04-01-2012, 09:46 AM   #45
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As several have pointed out, you do have to look at the whole package, not just power for the hill.

I wanted a tag because I drive in bad weather and I wanted the extra stability. That pushed us to a rear diesel and the big engine. Like many here, the jake brake is actually more important to me than the power up the hill. I have about 400 braking horse power to manage the down grades and don't have to worry about losing my brakes.
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Old 04-01-2012, 12:54 PM   #46
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Originally Posted by jimmyjnr View Post
We have a sightseer with chevy 8.1 , we live in CO and travel the i70 west over the mountains , never exceed 2500 rpm equates 45-50 mph. easy up and down .
Yes , a 500hp pusher would be quieter and faster but a gasser is what we can afford .
Don't stretch yourself financially Just enjoy the adventure
Safe travels everyone
I would second the above.
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Old 04-04-2012, 12:25 PM   #47
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I'm with P.J. No problems with my gas Workhorse. We're from Oregon and have been fulltiming and towing for several years all over the U.S. and the west. I get passed by DP's going up hills for sure, but I get passed by DP's in the flatlands too.
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Old 04-04-2012, 11:49 PM   #48
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It's not just the steepness; it's the altitude. A naturally-aspirated gas engine loses ~4% per 1,000 ft of altitude. So at ~5,000 ft (Denver) the power is down around 20%. A turbo-diesel loses about 1% per 1,000 ft. So at 5,000 ft you're down about 5%.

We spent most of the summer at altitudes >5,000 ft; our diesel never noticed.
I believe the keyword here is "Turbo." I wonder if you stuck a turbo on a v10 how it would handle the mountains?
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Old 04-05-2012, 12:20 AM   #49
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It's not just the steepness; it's the altitude. A naturally-aspirated gas engine loses ~4% per 1,000 ft of altitude. So at ~5,000 ft (Denver) the power is down around 20%. A turbo-diesel loses about 1% per 1,000 ft. So at 5,000 ft you're down about 5%.

We spent most of the summer at altitudes >5,000 ft; our diesel never noticed.
Cummins says (in print) that there is very little loss of power in a modern turbo diesel up to 10,000 ft. Probably not even 5%
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Old 04-05-2012, 08:56 AM   #50
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I believe the keyword here is "Turbo." I wonder if you stuck a turbo on a v10 how it would handle the mountains?
I totally agree with you. When we lived in Albuquerque our house was at 6,200 feet. We drove a pair of turbo-equipped vehicles (a Volvo and a Saab) and both were pretty much immune to the effects of altitude. It's all about how much oxygen you can "stuff" into the cylinders.
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Old 04-06-2012, 04:49 PM   #51
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It's really not about power (hp), it's all about torque! A 400hp gas engine will have about 400 lb.'s of torque while a 400hp diesel will, depending on the manufacturer have 3 to 4 times that much torque. It's torque that gets you up the hill, not hp.
And yes, getting down the "hill" is just as important as getting up the hill. A "jake brake", engine brake, exhaust brake will all get you to the bottom with your hm brakes in tack as you most likely won't need to touch them on the way down if you own a diesel pusher.
Just my opinion based on 3 diesel pushers traveling a total of 150,000 miles during the past 19 years.
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