1. Welcome to Tacoma World!

    You are currently viewing as a guest! To get full-access, you need to register for a FREE account.

    As a registered member, you’ll be able to:
    • Participate in all Tacoma discussion topics
    • Communicate privately with other Tacoma owners from around the world
    • Post your own photos in our Members Gallery
    • Access all special features of the site

New Tow Ratings for 2013 (S.A.E. J2807)

Discussion in 'Towing' started by chris4x4, Feb 10, 2011.

  1. Feb 10, 2011 at 4:17 PM
    #1
    chris4x4

    chris4x4 [OP] With sufficient thrust, pigs fly just fine. Moderator

    Joined:
    May 8, 2008
    Member:
    #6497
    Messages:
    106,154
    Gender:
    Male
    First Name:
    FlimFlubberJAM
    Tenoe, AZ
    Vehicle:
    2013 Rubicon Unlimited,
    4.10 gears, sliders, and lots of buttons.
    So far, Toyota is confirmed in meeting the new ratings, and I heard Dodge has also. Tow Ratings now have guidlines set by the SAE so as to not make the ratings as arbitrary as they once were/are now.

    http://www.automobilemag.com/features/news/0912_sae_tow_ratings_finally_pass_sniff_test/index.html


    Preposterous as it may seem, until recently there was no legitimate means of comparing the trailer-tow rating advertised by one truck manufacturer with claims issued by competitors. That created a game of leap-frog. With the introduction of every new large truck, the proud manufacturer would announce some new high in the number of pounds that could be hauled or towed. That would prompt one or more competitors to pause for a few months before announcing revised tow ratings for their products which would of course return their progeny to the top of the towing heap.

    But after years of effort, the SAE's tow vehicle trailer rating committee is finally ending the farce. The SAE's Surface Vehicle Recommended Practice J2807 spells out in precise terms a procedure for determining two important ratings: the maximum permissible gross combination weight (GCWR) for a tow vehicle and its trailer and the maximum permissible trailer weight rating (TWR).

    After three years of effort by the three domestic manufacturers and representatives from several of the Japanese brands, a standard was approved in April 2008 and scheduled for 2013 model year implementation. Some companies have already begin phasing in the more realistic J2807 tow ratings for their new models.



    There are five engineering characteristics that strongly influence any tow vehicle's performance:
    • The engine's power and torque characteristics.
    • The powertrain's cooling capacity.
    • The durability of the powertrain and chassis.
    • Handling characteristics during cornering and brakingmaneuvers.
    • The structural characteristics of the vehicle's hitch attachment area.
    Standard J2807 spells out test procedures and performance requirements that must be meant for a manufacturer to assign a maximum tow rating to a particular vehicle. While various trailer configurations are suitable for these tests, the towed unit must provide a minimum specified frontal area starting with 12 square feet for a TWR below 1500 pounds, ranging to 60 square feet for a TWR exceeding 12,000 pounds. There are also specifications for how the trailer's load is distributed on its axle(s) and how the attachment tongue is configured.

    One major change from past practice is what the SAE committee defines as Tow Vehicle Trailering Weight (TVTW). Unlike the past, a driver, a passenger, optional equipment purchased by at least one third of the customer base, and hitch equipment are now included in this calculation along with the base weight of the tow vehicle. Raising the TVTW figure automatically lowers the maximum permissible GCWR and TWR figures.


    Acceleration Performance Requirements



    The tow vehicle must meet these level road performance criteria to merit a particular TWR:
    • Acceleration from zero to 30 mph in 12.0 seconds or less in vehicles with a single rear wheels.
    • Acceleration from zero to 30 mph in 14.0 seconds or less in vehicles with dual rear wheels.
    • Acceleration from zero to 30 mph in 16.0 seconds or less in vehicles with dual rear wheels and a GVWR over 13,000 pounds.
    • Acceleration from zero to 60 mph in 30.0 seconds or less in vehicles with single rear wheels.
    • Acceleration from zero to 60 mph in 35.0 seconds or less in vehicles with dual rear wheels.
    • Acceleration from zero to 60 mph in 40.0 seconds or less in vehicles with dual rear wheels and a GVWR over 13,000 pounds.
    • Forty to 60 mph passing acceleration in 18.0 seconds or less in vehicles with single rear wheels.
    • Forty to 60 mph passing acceleration in 21.0 seconds or less in vehicles with dual rear wheels.
    • Forty to 60 mph passing acceleration in 24.0 seconds or less in vehicles with dual rear wheels and a GVWR over 13,000 pounds.
    Grade Launch Requirements

    The tow vehicle must be capable of repeatedly moving from rest for a distance of 16 feet on a 12-percent grade in both forward and reverse directions. Five such launches must be accomplished within five minutes in each direction.

    Highway Gradeability

    To merit a particular TWR, a vehicle must be capable of maintaining a minimum cruising speed while climbing the grade at Davis Dam on state roads 68 and 163 in Arizona and Nevada. This 12-mile-long run originating in Bullhead City, Arizona, involves grades that vary between 3- and 7-percent with an average over 5-percent. During this test, the minimum acceptable ambient temperature is 100-degrees F. and AC systems must be operating on the maximum cold setting with no recirculation and the blower at the highest possible setting.

    Single rear wheel vehicles must be able to maintain an average of at least 40 mph on this grade. Dual rear wheel vehicles are required to maintain 35 mph or more here. Dual rear wheel vehicles with a GVWR over 13,000 pounds must maintain at least 30 mph.

    To pass these hot-ambient-temperature, steep-grade challenges, there can be no vehicle component failures, no warning lamps, and no diagnostic codes alerting the driver. In addition, the tow vehicle cannot lose any engine coolant. The vehicle under test must be equipped with the lowest numerical axle ratio available from the manufacturer.

    Handling Requirements

    Standard J2807 specifies that an understeering handling attitude must be maintained up to at least 0.4g cornering without a weight distributing hitch. With a weight distributing hitch (which transfers vertical load from the tow vehicle's rear wheels to its front wheels), an understeering attitude must be maintained up to only 0.3g cornering.
     
  2. Feb 10, 2011 at 4:17 PM
    #2
    chris4x4

    chris4x4 [OP] With sufficient thrust, pigs fly just fine. Moderator

    Joined:
    May 8, 2008
    Member:
    #6497
    Messages:
    106,154
    Gender:
    Male
    First Name:
    FlimFlubberJAM
    Tenoe, AZ
    Vehicle:
    2013 Rubicon Unlimited,
    4.10 gears, sliders, and lots of buttons.
    Braking Requirements

    The test vehicle and trailer must stay within a 11.5-foot wide traffic lane during stopping tests. The parking brake must be capable of holding the rig on 12-percent up and down grades.


    Stopping distance requirements from an initial 20 mph without use of trailer brakes are:
    • In 35 feet or less with a TWR of 3000 pounds or less and no trailer brake requirement.
    • In 45 feet or less with a TWR of 3000 pounds or less and a trailer brake requirement.
    • In 80 feet or less for TWRs above 3000 pounds.

    To assure that the tow vehicle's structure is capable of towing a particular trailer load, standard J2807 specifies that no more than 5 degrees of permanent angular deformation at hitch attachment points is acceptable. Also, the highest experienced trailer hitch attachment force must be withstood for five seconds without significant loss of load (no structural deflection).

    The SAE towing committee purposely defined the scope of this standard not to include brake fade and durability aspects related to the tow vehicle such as the endurance of chassis, powertrain, suspension, and brake components. Other SAE standards and each manufacturer's own internal requirements instead address these towing issues.

    If all requirements specified in J2807 are met, the tow vehicle manufacturer may state the following: This model meets or exceeds the tow-vehicle trailering requirements of SAE International per SAE J2807. All manufacturers are strongly encouraged to use this test for tow ratings beginning with the 2013 model year. Some brands that have tired of the leap-frog game -- Toyota for one -- have already commenced use of this worthwhile trailer towing advancement
     
  3. Feb 10, 2011 at 4:23 PM
    #3
    chris4x4

    chris4x4 [OP] With sufficient thrust, pigs fly just fine. Moderator

    Joined:
    May 8, 2008
    Member:
    #6497
    Messages:
    106,154
    Gender:
    Male
    First Name:
    FlimFlubberJAM
    Tenoe, AZ
    Vehicle:
    2013 Rubicon Unlimited,
    4.10 gears, sliders, and lots of buttons.
    I hear that Nissan, Ford, Chevy, Honda will take hits ranging from 400# reductions, on up to 4500# reductions. Dodge took a big hit in their 1500 trucks, as their rating went from 10,900 down to 7000# +/- on some vehicles. The Dodge 2500 and 3500 trucks are said to meet the 2013 ratings now.
     
  4. Feb 10, 2011 at 4:26 PM
    #4
    chris4x4

    chris4x4 [OP] With sufficient thrust, pigs fly just fine. Moderator

    Joined:
    May 8, 2008
    Member:
    #6497
    Messages:
    106,154
    Gender:
    Male
    First Name:
    FlimFlubberJAM
    Tenoe, AZ
    Vehicle:
    2013 Rubicon Unlimited,
    4.10 gears, sliders, and lots of buttons.
    LOL!! Im wondering whats gonna happen to the Ridglines 5000# rating.
     
  5. Mar 8, 2011 at 8:21 AM
    #5
    Paul's TRD

    Paul's TRD I'm Not Your F***ing Brother

    Joined:
    Jan 29, 2010
    Member:
    #30306
    Messages:
    616
    Gender:
    Male
    TX
    Vehicle:
    2011 Z71 4x4 5.3L V8
    This is pretty good stuff. I'm glad that Toyota was already complying. Makes me feel better about the trailer I'm about to buy, although I didn't have much reservations as I've towed a lot of other things and experience does play a big hand on knowing what you and can't tow just by the looks of the trailer/load.
     
  6. Aug 17, 2011 at 2:27 PM
    #6
    sechsgang

    sechsgang Well-Known Member

    Joined:
    Oct 18, 2007
    Member:
    #3112
    Messages:
    361
    Gender:
    Male
    Vehicle:
    06 DC TRD OR 4WD 6spd
    I tow a Travel Trailer with my Tacoma. The real limitation of the Tacoma is not the tow rating, but the (low) payload.
    The Ridgeline has a significantly higher payload, I believe. Therefore, in real life situations, the Ridgeline may be the more capable tow vehicle compared to the DC Tacoma.
    It is sad, really.
     
  7. Aug 17, 2011 at 2:29 PM
    #7
    sechsgang

    sechsgang Well-Known Member

    Joined:
    Oct 18, 2007
    Member:
    #3112
    Messages:
    361
    Gender:
    Male
    Vehicle:
    06 DC TRD OR 4WD 6spd
    Does the Tacoma actually comply?
     
  8. Aug 17, 2011 at 5:46 PM
    #8
    Goober

    Goober Earthlings are fun to watch!

    Joined:
    Dec 20, 2010
    Member:
    #47990
    Messages:
    687
    Gender:
    Male
    Utah - Why just have only one?
    Vehicle:
    '11 TRD Off-Planet AccessCab
    I don't think the tow rating will change for the Ridgeline. I've now towed the same trailer with both the Ridge and Tacoma. Powerwise they felt the same but the Ridgeline was rock solid with a beefier suspension to start with. Gas mileage towing was the same. The Ridgeline manual states to reduce max tow capacity by 3% for every 1000' of altitude unless towing a boat (no shit). What really griped me about the Ridgeline was the transmission. No way to lock out 5th gear, so it would hunt constantly, and I mean every 15 seconds it was shifting between 4th and 5th. The manual stated to change speed if this happens, well I tried driving 55, 60, 65 and no difference, at 70 it would hunt between 3rd and 4th. When I went to the dealer and asked if there was a solution the official reply was "Honda doesn't recommend towing in 5th gear" and no further discussion. The Tacoma occasionally hunts but nothing like the Ridge and when it does just drop it to 4th and no more hunting. My official reply to Honda is, "I don't recommend towing with a Ridgeline".

    It sucks that you have to do something to the Tacoma's suspension, but at least you can do something.
     
  9. Aug 17, 2011 at 6:22 PM
    #9
    sechsgang

    sechsgang Well-Known Member

    Joined:
    Oct 18, 2007
    Member:
    #3112
    Messages:
    361
    Gender:
    Male
    Vehicle:
    06 DC TRD OR 4WD 6spd
    I don't have any hunting problems with the manual transmission. :) It always is in exactly the gear I want it to be in. ;)
    That is one thing I like about stick shifts.
     
  10. Aug 17, 2011 at 7:15 PM
    #10
    08TRDOFFROAD

    08TRDOFFROAD Well-Known Member

    Joined:
    Nov 4, 2008
    Member:
    #10482
    Messages:
    885
    Gender:
    Male
    First Name:
    Daniel
    Utah
    Vehicle:
    08' 4x4 TRD Offroad
    Bilstein 5100's w/front's set at 1.75", 17x9 Moto Metal 951's, 265/70/17 BFG AT KO's, TRD exhaust, Colormatched grill, GrillCraft,, Rear leaf TSB, Illuminated 4wd selector switch
    I can do that too with my 5-speed auto. ;) I shift my truck like a manual when towing (L-4 and never put it in "D"). When I see a hill, I downshift. No problem with gear hunting here either!
     
  11. Aug 17, 2011 at 9:36 PM
    #11
    sechsgang

    sechsgang Well-Known Member

    Joined:
    Oct 18, 2007
    Member:
    #3112
    Messages:
    361
    Gender:
    Male
    Vehicle:
    06 DC TRD OR 4WD 6spd
    You guys can put the truck in 3rd or second and it will stay there?
     
  12. Aug 17, 2011 at 10:06 PM
    #12
    sechsgang

    sechsgang Well-Known Member

    Joined:
    Oct 18, 2007
    Member:
    #3112
    Messages:
    361
    Gender:
    Male
    Vehicle:
    06 DC TRD OR 4WD 6spd
    Thanks whipper! As you can see I don't drive automatics very often .... :)
     
  13. Aug 18, 2011 at 7:15 AM
    #13
    Goober

    Goober Earthlings are fun to watch!

    Joined:
    Dec 20, 2010
    Member:
    #47990
    Messages:
    687
    Gender:
    Male
    Utah - Why just have only one?
    Vehicle:
    '11 TRD Off-Planet AccessCab
    One thing I wish the Tacoma did that both Hondas I had did was when putting the auto in 2nd it would stay in 2nd. It wouldn't down shift or up shift.
     
  14. Aug 18, 2011 at 9:05 AM
    #14
    sechsgang

    sechsgang Well-Known Member

    Joined:
    Oct 18, 2007
    Member:
    #3112
    Messages:
    361
    Gender:
    Male
    Vehicle:
    06 DC TRD OR 4WD 6spd
    The one main thing I'd wish for in the next model Tacoma (and in that case I'd buy one again) would be a HD payload package: upgraded frame, rear end, rear axle, wheels, tires, rear springs. Maybe an additional 400-500 lbs?
     
  15. Aug 18, 2011 at 12:11 PM
    #15
    08TRDOFFROAD

    08TRDOFFROAD Well-Known Member

    Joined:
    Nov 4, 2008
    Member:
    #10482
    Messages:
    885
    Gender:
    Male
    First Name:
    Daniel
    Utah
    Vehicle:
    08' 4x4 TRD Offroad
    Bilstein 5100's w/front's set at 1.75", 17x9 Moto Metal 951's, 265/70/17 BFG AT KO's, TRD exhaust, Colormatched grill, GrillCraft,, Rear leaf TSB, Illuminated 4wd selector switch
    That would be extremely nice! It would definitely make things easier!
     
  16. Aug 18, 2011 at 12:23 PM
    #16
    08TRDOFFROAD

    08TRDOFFROAD Well-Known Member

    Joined:
    Nov 4, 2008
    Member:
    #10482
    Messages:
    885
    Gender:
    Male
    First Name:
    Daniel
    Utah
    Vehicle:
    08' 4x4 TRD Offroad
    Bilstein 5100's w/front's set at 1.75", 17x9 Moto Metal 951's, 265/70/17 BFG AT KO's, TRD exhaust, Colormatched grill, GrillCraft,, Rear leaf TSB, Illuminated 4wd selector switch
    But why should we have to jump up to a full size, when our truck aside from the payload capacity making things tight is perfectly capable of towing what we are? Why couldn't Toyota make a HD Payload package as part of the Tow package? I woud pay a little extra for it.
     
  17. Aug 18, 2011 at 12:27 PM
    #17
    kbp68

    kbp68 hey...I can change this!

    Joined:
    May 16, 2008
    Member:
    #6689
    Messages:
    601
    Gender:
    Male
    B.C.
    Vehicle:
    TRD Off Road DC/SB
    3" Pro Comp Lift/Level, ARB Winch Bumper, Superwinch UT3000,White Sport Grille, Bedliner'd rocker panels, Draw-Tite brake controller
    I hope the new taco has a towing mirror option!
     
  18. Aug 18, 2011 at 1:16 PM
    #18
    sechsgang

    sechsgang Well-Known Member

    Joined:
    Oct 18, 2007
    Member:
    #3112
    Messages:
    361
    Gender:
    Male
    Vehicle:
    06 DC TRD OR 4WD 6spd
    Yeah, that would be another wish of mine ... maybe included in the above payload package.

    Whipper, as 08TRDOFROAD said, I am perfectly fine with the size of the Tacoma. There would be no reason for me to get a full size truck, that really is a lot bigger. I don't need / want all of that, just a little more payload would do it.

    But I know, I am dreaming ... :(
     
  19. Aug 18, 2011 at 1:25 PM
    #19
    sechsgang

    sechsgang Well-Known Member

    Joined:
    Oct 18, 2007
    Member:
    #3112
    Messages:
    361
    Gender:
    Male
    Vehicle:
    06 DC TRD OR 4WD 6spd
    Yeah, you are right, unfortunately.

    But anyway, while Toyota is at it and includes towing mirrors in my HD package, they should also throw in 2LO. :D
     
  20. Aug 18, 2011 at 1:44 PM
    #20
    Pugga

    Pugga Pasti-Dip Free 1983 - 2015... It was a good run

    Joined:
    Jun 18, 2010
    Member:
    #39131
    Messages:
    30,837
    Gender:
    Male
    First Name:
    Mike
    Massachusetts
    Vehicle:
    '13 Ford F-150 SCREW
    F-150 Mod
    2Lo would be cool. I've found the Tacoma tows moderately well but the reverse gear is kinda high. The transmission doesn't seem too happy trying to back a heavy trailer up a hill. Even if no 2Lo, a lower geared reverse gear option would be nice.
     
To Top