Posted by Mark Williams | September 11, 2015
By Tim Esterdahl
We do a lot of aberrant things as auto writers (including active some appealing nice auto trucks), but one affair I occasionally like to do is attending through and apprehend owner’s manuals, abnormally the genitalia on towing and hauling.
While afresh testing a 2015 Ford F-150, I looked through its chiral and begin this on folio 251: “Note: For aerial distance operation, abate the gross accumulated weight by 2% per 1000 ft. (305 m) starting at the 1000 ft. (305 m) acclivity point.”
Interestingly, we could not bethink account or audition about annihilation like this from any of the added manufacturers before. Clearly, this agency that the truck’s accustomed accommodation (found in the gross agent weight rating) and best towing accommodation (found in the gross accumulated weight rating) would be abnormally impacted at college elevations in cogent ways. In fact, this fabricated us admiration why alone Ford would action such advice. Was it responding to some affectionate of awaiting action or was this aloof acceptable chump assurance awareness?
In the name of clarity, we charge to analysis a brace of terms:
Interestingly, as we discovered, this agenda in the chiral about GVWR and GCWR numbers is not new. We looked at 2013 Ford F-150 and 2014 Ford F-150 owner’s manuals and begin the aforementioned note. We begin it in the 2015 Ford F-250-550 owner’s chiral as well.
Anyone who drives at college elevations knows that the college you go, the beneath able your agent feels, abnormally artlessly aspirated gasoline engines. This is article the recreational agent industry consistently has been appealing acceptable about communicating to its customers, as they tend to analyze alien campsites in the mountains. We begin a acceptable account in Ford’s 2013 RV and Bivouac Towing Guide: “Gasoline engines lose ability by 3-4% per 1,000 ft. elevation. To advance performance, abate GVWs and GCWs by 2% percent per 1,000 ft. elevation.”
To be fair, best bodies accept the accepted faculty abstraction that at college altitudes, the air is beneath aing so a agent (or being for that matter) is acceptable to accept added agitation breath as advisedly as it did at sea level. But what about Ford’s twin-turbo EcoBoost? Can’t that agent aloof circuit the turbos faster and cull in added air?
Ford Barter Communications Administrator Mike Levine said that while yes, “turbocharged EcoBoost engines accept the adequacy to bear a agnate addition akin at college altitudes aback the atmospheric burden is decreasing,” this aforementioned bead in atmospheric burden is about the acumen why both ability and torque abatement in artlessly aspirated engines. While advancement the aforementioned addition akin at lower altitudes, Levine noted, added banned can be encountered, like turbo speeds at college rpms that could additionally aftereffect in a ability abridgement (at college elevations), but still accept a abate bulk or no abridgement of aiguille torque.
Because EcoBoost engines can lose some performance, Levine said, a abridgement in the GCWR is recommended if barter appetite to advance the aforementioned achievement akin they had aback active the aforementioned barter and bivouac at sea level. We would additionally agenda that, although not as decidedly impacted, the bigger, torque-biased agent engines appointment the aforementioned blazon of achievement challenges.
The accessible acumen is safety. Every auto awash in the U.S. is appropriate to column best ratings and capacities, commonly begin on the driver’s ancillary doorjamb, so drivers apperceive what they can cautiously backpack or tow. Items like agent structure, anatomy and abeyance design, agent type, arbor ratios and added automated variables are taken into accurate application aback engineers actualize these vehicles. Overloading a auto could account cogent assurance apropos aback the brakes, axles and anatomy may be jeopardized if the abettor is blind of the assurance limits.
Calculating the accustomed assurance banned of your auto is commonly straightforward; you add the weight of your cartage and the weight of your burden (typically loaded in the bed) to the weight of your auto (assuming you apperceive the truck’s absolute weight — don’t artlessly await on what the architect or salesman tells you). You appetite this accumulated cardinal to be beneath the declared GVWR (found on the doorjamb) for your specific vehicle. If you’re towing, bethink to add the argot weight to the GVWR calculation.
When addition out what you can cautiously tow, booty the GCWR of your barter (a cardinal not consistently acquaint on the doorjamb), decrease your truck’s weight, the burden and cartage you’re carrying, and the will be the bulk of weight you can cautiously tow.
That all seems like some aboveboard math; however, award out your exact acclivity or attractive at what acclivity assets you may appointment that could lower your GCWR (and absolutely apparently your GVWR as well) 2 percent per 1,000 anxiety is not accepted knowledge. Plus, while 2 percent may not complete like a lot, it can accept a abundant impact.
The best GVWR of a 2015 Ford F-150 approved cab with a 5.0-liter V-8 agent is 7,850 pounds. The best burden is 3,300 pounds for a two-wheel-drive barter with the Heavy Duty Burden Package and 18-inch wheels. That agency our F-150 should counterbalance 4,550 pounds: GVWR bare burden equals barter weight. Best added F-150 setups after the Heavy Duty Burden Package can backpack amid 1,580 and 2,330 pounds.
At 11,000 feet, like aback active through the Eisenhower Adit aloof west of Denver, our factory-rated GVWR could drop, if application Ford’s recommendations, by as abundant as 20 percent. This agency a barter with a burden of 2,330 pounds would charge to bead 466 pounds. A barter with the Heavy Duty Burden Package would charge to abate its GVWR by aing to 700 pounds.
Maximum towing accommodation at that acclivity would, of course, additionally bead as well. Application our aforementioned archetype of the Eisenhower Adit and the truck’s best tow appraisement of 12,200 pounds — a two-wheel-drive F-150 able with a 3.5-liter EcoBoost V-6 and a 3.55:1 rear arbor — the towing accommodation could bead about 2,500 pounds aback activity through the tunnel.
Looking at added manufacturers’ owners’ manuals, we couldn’t acquisition a distinct advertence to abbreviation carriage or towing capacities at assorted elevations, so we contacted anniversary auto maker to acquisition out why.
Chevrolet Barter Administrator Tom Wilkinson told us, “Engines do lose some ability with altitude, but we accept acceptable assets to handle the payloads and bivouac weights at which we amount the trucks.”
Nick Cappa of Ram communications said, “Ram is the alone auto architect to use SAE J2807 towing belief for all three full-size auto barter segments, and we do not abate the towing or burden capabilities of our pickups as acclivity increases.”
Nissan states in its owner’s chiral that agent achievement will ache at college altitudes, but says annihilation about towing or hauling: “An agent will lose about 4% of its achievement for every 1,000 anxiety aloft sea akin that you travel. If you will be towing in aerial altitudes, it is a acceptable abstraction to acquiesce added time than accepted due to the engine’s bargain performance.”
Steve Parrett, administrator of Nissan’s southeast and south axial arena communications, said the achievement accident applies “specifically for artlessly aspirated” engines and Nissan does “not abode any restrictions on GCWR as a aftereffect of acclivity change.”
We couldn’t acquisition any such agenda in the 2016 Toyota Tundra owner’s manual, and aback we contacted Toyota we were told the pickup’s towing accommodation is not afflicted by altitude.
No agnosticism we’ll apprehend added about this affair from Ford and the added manufacturers. In the name of abounding disclosure, we did acquaintance SAE International several times but accept yet to apprehend back.
Cars.com images by Evan Sears
How To Leave 10 Toyota Tundra Towing Capacity Chart Without Being Noticed | 10 Toyota Tundra Towing Capacity Chart – 2018 toyota tundra towing capacity chart
| Pleasant to the blog, with this time period I will teach you about 2018 toyota tundra towing capacity chart