Leafs VS Coils

I posted this in another thread, but it is relevant here:

From what I understand, it will be difficult to make a coil spring suspension that is as progressive as a leaf pack. This matters, for instance, for a heavy overlander trying to climb a steep hill at an angle: as most of the vehicle weight shifts to one rear coil, the vehicle has a higher risk of rolling over. Installing a stiff enough coil to counter that characteristic greatly compromises ride quality. (See the Tipover Challenge on the Hell's Revenge Trail in Moab – a "challenge" that has never been much of a challenge for leaf sprung 2d and 3rd gen Tacomas.)

This problem on the 2024 Tacomas is possibly compounded by the fact that the leaf-sprung trim levels of the new chassis have switched back to a compression shackle, away from the tension shackle and shackle hanger that the Tacoma utilized from 2005-2023. It seems to be the opinion of many on this forum that tension shackles and hangers are better for heavier payload and overall stability in turns.

 

24’s are also spring under setup (like deaver pre running setup) instead of spring over.

 

Video in another thread, Sheldon states the spring under was a necessity to get leafs to work with the new frame. Easier to design spring hangers and go under axle that would make leaf’s work, than a different frame.

Roughly around the 27:30 mark if you don’t want to watch the whole video.

https://www.youtube.com/watch?v=oznrNjfsOdg&t=86s

 

^Interesting. Does that mean the 4th gen frame is 3" lower to the ground?

 

Not sure. Since the wheelbase is pushed back, the arch of the frame starts further back is why the difference of where they could weld on the spring hanger to get leafs to work on the new frame, and why spring over wouldn’t work. Only a guess, tape measure would confirm it for sure.

 

Leafs were / are always used on trucks, SUV and on railway carriages and MILITARY VEHICLES.

Coils were / are always used for potato cars and sedans.. Weak SUVs. Those Civics you see that some dudes consider "sports" cars etc.

'nuff said.

 

https://www.oshkoshcorp.com/brands-innovations/mobility

 

Unlike the empty bed truck you posted.

 

What are your thoughts on ABS and disc brakes?

 

you said the military and trains don’t use coil suspension, well….

 

So coils mean I won’t be able to haul a 60 ton tank in my 4th gen?!! Lame.

 

You meant to say car with leaf springs will have more towing capacity & toughness than your coil springs? Hilux has leaf springs, so what is your take about that? Please now don't compare some potato coil spring cars with a pick up that is basically a vehicle that rebels mount all kinds of heavy military weapons.

Leave Hilux alone, even all big pick up trucks use leaf springs. I haven't seen Ford's towing insane amount with coil springs under there.

You are trading COMFORT, and SOFT ride over capacity and reliability.. Maybe go buy an SUV, what you need truck for if you don't like way truck is set up.

There is nothing wrong with having pick up for other stuff than towing/carrying/working but leaf springs are there for a reason. Its there to do TRUCK work. Not just riding around city, or off road but they have 4runner for that.

 

Tacoma with its 500 lb payload capacity belongs in which category?

 

I am sorry which Tacoma has 500 lbs payload capacity? Are you mixing up Smart car and Tacoma? ( Although I am sure even smart car has more payload than 500 lbs )

 

Have you look under a Ram 2500?

And you do realize the 4G Tacoma has a better payload than the out going 3G, right?

A lot of fire trucks use coils, the vehicle and water isn’t exactly light.

https://www.youtube.com/watch?v=_UA_ihJXoBM

 

But fire trucks aren't carrying tanks, are they? Fire trucks need to be mobile too, they literally tell you in the video lol. I don't think you understand this right, at least from my point of view :

Leaf springs are good for heavy weights & take beating well but is rugged, does not provide much flexing and is rough drive. So because of this, it is installed on large trucks, military trucks that need to CARRY HEAVY WEIGHTS and obviously move slower. Have you seen big trucks that are carrying overload weight and drive speed limit or even above?

Coil springs can't take as much beating and provide as much load capacity but are flexible. For this reason it is installed on cars that need that flexibility & mobility, which some are emergency vehicles. Some military cars may have it based on what are they going to be used for.

 

They are carrying tanks…water tanks that is. It isn’t exactly light.

Most over the trucks use air suspension.

New rear coil sprung Tacoma has better payload than the previous model, not sure why you have an issue with it.

The Navistar SOTV-B with diesel Cummings rated at 600 ft/lbs tq, has a payload of 3000-4000 lbs, it has coils…must be for soft handed nancys. That or parking at the soccer fields on Saturdays has become quite the dangerous affair for moms.

https://jalopnik.com/the-pickup-truck-for-the-next-toyota-war-isnt-a-toyota-1836715824


https://www.youtube.com/watch?time_continue=25&v=SRbko-8jxjM&embeds_referring_euri=https://www.google.com/&source_ve_path=Mjg2NjY&feature=emb_logo

 

Right, water tanks are heavier than 50 Ton war machines.

Right but F350 has almost double of that payload with leaf springs.

 

It is still pretty fucking heavy, you keep saying coils are weak, I am showing you they obviously aren’t. Sure you can keep on one man upping, but this thread is after all about the 4G Tacoma…that has better payload and will ride smoother than the 3G. So not sure what your issue is.

yeah so? Not impressed with the Navistar and a 3000-4000 lbs. payload in a midsize truck are you? And that is the HiLux size, smaller than a Tacoma.

Used to have CDL when we had our construction business. All of our trucks were leaf at the time, I am impressed those same class of trucks can now have coils, you may not, but I am.

I have driven heavy trucks, have you?

 

I did not say coil springs are weak, I said they are weak compared to leaf springs when it comes to weight & reliablity.

If you want a smooth ride and luxury go buy an SUV.


Yes I have, and that's why I won't be paying extra money for comfort ride in a TRUCK just to get less reliability from it. However you seem to be okay with that extra price for more SUV kinda ride on a truck so go with it.

Also don't forget to be soft on your truck, you wouldn't want your luxury truck to do any truck work would you?

But still not as heavy as 50 TON TANK CARRIED BY LEAF SPRINGS.