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03-04-2012, 02:07 PM
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#1
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Member
Join Date: Feb 2012
Posts: 46
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RPM' s going uphill?
Hello, I have a 2003 Yukon XL Denali and will be pulling my toyhauler this coming weekend for the first time. It has the 6.0L and my question is....what RPM's should I use going uphill grades?
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Rodney 2006 2005 Fleetwood Southwind 32V, Fleetwood Gearbox 230FS, 2004 Fleetwood Storm 30H
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03-04-2012, 07:59 PM
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#2
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Senior Member
Join Date: Aug 2004
Location: Wherever we are
Posts: 4,288
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Interesting question--does your tach have a redline on it? If not, the engine is probably computer-controlled to limit rpms to a safe range.
Joe
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03-04-2012, 08:02 PM
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#3
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Registered User
Monaco Owners Club
Join Date: May 2009
Posts: 3,198
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No, a modern chevy / gmc doesn't have a redline marked on the tach.
My 04 silverado SS shifts at right around 6000 rpm, but will go to 6400 if I hold it in gear manually.
But torque is best at around 4000. And no way would I push her uphill pulling as load any harder than that.
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03-04-2012, 09:19 PM
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#4
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Senior Member
New Horizons Owners Club
Join Date: Oct 2010
Posts: 203
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Do you have a transmission temperature gauge?
The transmission will get pretty hot at 4000 rpm in a lower gear. Don't worry about holding highway speeds. Go slow, things will be easier on you and your truck.
Does your truck have a factory towing package? If not you should consider adding a transmission cooler to the truck.
Going down a hill is a whole lot more dangerous than going up. We tow with a Chevy 2500HD and DuraMax/Allison. Our rig grosses 20,500 pounds. Here is what we do when we see a steep downgrade (6% or Better). We slow to 52 MPH, manually downshift to 3rd gear, set the cruse control, and let the engine hold the rig. If we have to apply the brakes we apply light steady pressure. The key to getting down the grade is to get control before you start down.
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03-04-2012, 09:24 PM
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#5
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Senior Member
Join Date: Jun 2006
Location: Dallas,OR
Posts: 4,584
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What is the motors Red line? That is probably where you will be if you want to maintain any sort of speed.
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Don and Lorri
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03-04-2012, 09:40 PM
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#6
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Senior Member
Join Date: Jan 2011
Location: Pensacola, FL
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I like to keep an engine at about 80% of redline rpm for maximum pulling. That usually puts me at about maximum horsepower, with lots of coolant circulation. Going much higher than that really gives no benefit, since horsepower is actually going down.
If you can find what rpm your engine is rated for maximum hoursepower, I'd shoot for that.
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03-04-2012, 11:59 PM
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#7
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Member
Join Date: Feb 2012
Posts: 46
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Thanks for the tips! The Yukon XL Denali max horsepower is at 4000 RPM's . I figure if I hold it around 2500-3000 I will be ok while going uphill. There is no redline in it. Yes, there is a tow package with transmission cooler.
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Rodney 2006 2005 Fleetwood Southwind 32V, Fleetwood Gearbox 230FS, 2004 Fleetwood Storm 30H
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03-05-2012, 12:02 AM
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#8
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Member
Join Date: Feb 2012
Posts: 46
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My concern was keeping the transmission and engine at a safe temp. The XL Denali is rated to tow 8200# and I will be around 6500#
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Rodney 2006 2005 Fleetwood Southwind 32V, Fleetwood Gearbox 230FS, 2004 Fleetwood Storm 30H
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