Sandman 4x4
Well-Known Member
- First Name
- Kevin
- Joined
- Jul 23, 2024
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- 689
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- 564
- Location
- Kissimmee, Florida
- Vehicle(s)
- 2024 Gladiator Sport S
- Occupation
- Retired. Beach bum.
Absolutely all info worth reading and heeding.So if a vehicle passes the SAE testing and comes up with a particular number, the manufacturer isn't going to use that number as the tow rating, even though the SAE testing takes the vehicles to their limits of steering, braking, cooling systems and so on? It's just a recommendation?
That testing is crazy intense and rigorous, and it would seem to me that towing over the number they earn is asking for some serios trouble.
Talking of springs - stiffer springs can cause understeer - in other words, the vehicle won't turn where you want it to go in an emergency. So it's ok if you put on heavier springs and now it can't meet the SAE steering while towing requirements
Increased ride height increases body roll and understeer.
So bigger tires reduce your ability to stop - meaning you may no longer meet those SAE test numbers.
Stiffer springs, sometimes used in lifts - increases understeer. That means in a turn it no longer goes where you want it to go but will likely swing wide.
Taller springs can do the same - increase understeer .
These also change sway characteristics greatly - meaning your lift can cause you to have different issues with trailer sway, perhaps even less ability to control it.
The Mojave wasn't available until into 2020, possibly didn't get tested with the others (virtual or physically). Also note the max tow numbers were changed later - perhaps some re-testing OR, the weights changed. If you note how the tow ratings are figured, any change to vehicle weights can impact the performance and results in the SAE J2807 testing.
Once testing has been completed and a truck model meets all of the criteria, the basic calculation for the SAE maximum Tow Weight Rating is: TWR = GCWR – TVTW. By subtracting the total weight of the tow vehicle (the TVTW includes the weight of the driver, passenger, and additional equipment) from the tested GCWR, the result is the SAE J2807-compliant Tow Weight Rating.
Change the vehicle weight, and you get different results.
Lifts, tires, vehicle weight - all impact the tow numbers.
So yes, those things do impact towing by REDUCING the numbers
How much?
Only taking it through the testing will tell that! There's no such thing as a calculator!
Again,
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