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Old 06-04-2013, 10:54 AM   #29
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In the NW we have several long....steep grades ie, Big Sandy, Lewiston Grade, Vantage Grade along with several mountain passes. I usually pull a boat making our total weight about 31,000 lbs. Seems most grades run between 5-6%. The 330 Cat does a great job, but the 6 sp Allison transmission gets all the credit. I usually manually adjust the gears from 6 down to 4 based on 1500 RPM being where I do the down shift. I've never had to go below 4th gear. My MPH is 45 at that point. As the RPM's increase over 1500 I take it to the next gear. On long grades there's points where the grade decreases which allows me to shift up and when the grade increases I down shift again. The engine stays cool and I'm not over powering the drive train. I'm very happy with the torque of the 330 Cat.
I had to read me all over again to see how a few prior posts got what I said backwards? Nope. I said it right! Just a note on the up shift: When RPM's begin to rise above 1500 significantly I usually shift to the next gear (up) around 1700-1800. That usually drops the RPM's back to around 1400+. A driver can feel how the engine and transmission are working as a unit. Even if I didn't have gauges I would know when to shift (up or down). Back to the OP: Didn't intend to sidetrack your HP issue. Just wanted to let you know how I got around with an engine under 400 hp.
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Old 06-04-2013, 12:06 PM   #30
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How many 6% grades will you be pulling in each driving day?

How much time will 35mph uphill vs 55mph uphill cost you on that day?

To put dollar value to the answers, how much is the potential time saved worth to you?

Our 300hp Cummins with 860 lbs of torque gets our 36,000 lb rig and toad combo to the top every time here in the Western mountains.

I really would like a 400 ISL, but do not really need one........
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Old 06-04-2013, 01:01 PM   #31
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On a 10 mile 6% grade, I crest it at about 45mph.
If the rig next to me crests it at 55, he will be a couple minutes ahead of me.

If his flat road speed is 70 and mine is 60, and he Wal-docks after 12 hours and I go to camp after 300 miles to have a campfire, a fine meal, family time, a great nights sleep, who wins?
Are you saying that you can't have "a fine meal and a great nights sleep" at Wally World??? I've had both...the DW puts on the crock pot in the AM and when we stop at dinner time we have an excellant meal, then it's a little TV time and then off to dream land.
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Old 06-04-2013, 01:24 PM   #32
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I think you should buy whatever your wife wants...Remember if SHE's not happy than YOU won't be either. and believe me, every hill you try to climb she will remind you that if you had ONLY listen to her ......

Now, as far as motors, I've had a coach with the ISL 400, and it was ok... nothing great, but one ride in a coach with the ISX showed me which motor I really needed, hence the purchase of the Signature....Size does matter...
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Old 06-04-2013, 02:00 PM   #33
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Are you saying that you can't have "a fine meal and a great nights sleep" at Wally World??? I've had both...the DW puts on the crock pot in the AM and when we stop at dinner time we have an excellant meal, then it's a little TV time and then off to dream land.
I would love to Wal-dock. Just waiting for the shade trees, fire rings, hook-ups, tables, etc.
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Old 06-04-2013, 07:01 PM   #34
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[QUOTE=cb5300;1592523]I think you should buy whatever your wife wants...Remember if SHE's not happy than YOU won't be either. and believe me, every hill you try to climb she will remind you that if you had ONLY listen to her ......

Yeah, and she'd be the type to remind me too.
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