Cab Mount Chop - Food for thought?

Do you still have your sway bar on? That limits articulation. people put larger tires on because that is the cheapest way to get your lowest point (diff) higher. Unless you can afford to completely redesign your truck to have portal axles. Anyways.



OP,

How about all that extra weight people add to their vehicles for better off road performance, which increase stopping distance? People still drive drunk. People still text and drive. People still abuse heroin, and they know better.


What is your end goal to this thread? Do you want everyone to stop CMC so they can save themselves? Because that is not going to happen. So again. What is you end goal?

 

I’ll let him answer but it seems he’s just having a logical debate conversation about the topic. Nothing wrong with that. I too agree with all of your points but it doesn’t mean we can’t talk about cmc or learn more about how it affects things. I think that a “bed rack, with RTT & 400lbs of other crap” bolted to the truck probably affect the safe handling during an accident moreso than a CMC trimming does but I base that on no proof at all & just speculation.

 

I see this whole cmc debate as all speculation until someone crash tests one with a cmc.

We all know it takes greater force to stop something that has more inertia. Braking under load vs not is a very valid, and proven fact.

Trimming something, then welding a piece back in place that clears a bit more tire is not the same as cutting your frame for 44s

 

Theoretically speaking, How about the hi-lift and RTT and Murder Spork and ax and gas cans on your fancy bed rack coming through the back window when you hit something.... thats it!!! We should just all drive stock trucks, its how Toyota intended.... anything else is extremely foolish.

 

Yeah agreed. Let’s just scrap all this nonsense and drive boring trucks that break oil pans on each trail.

 

I’ve wondered that too. Toyota claims a new steel and treatment I think? Who knows what their process is and what happens to the strength of the structure after it’s been welded. Heat does things to metal. You can trust the engineer, who a major corporation has invested their faith in, maybe this guy

Or you can trust this guy

Who does kitchen remodel demo during the day.


Last time I checked, no toyota engineers have checked in to shed some light on this. Just bro-sci. Which I love.

 

The worst crash test I've ever watched.
https://youtu.be/UnOGXCnTOj0
I've been a painter/ bodyman for 25 years and professionally for 21. I'm always looking up crash tests.On my vehicles and new models I currently work on . The delorean was the worst .

 

I do have my sway bar on but I carry an electric impact so I can buzz it off when I go off road. I uuundersta going a size up to gain an inch of clearance under the diff. That's practical. But you don't need a CMC for that. 33" or 35" 285s are what I mean by giant tires. The wheel well is there to protect other drivers from spray/kickup and to give the tire somewhere to go during articulation. Fill the well and that can't happen. The extra weight on the hub also destroys your steering rack.

Do what you want, it's your truck. But if you don't trailer it to the off road park and you drive on the interstate at 80 mph, please get some mudflaps as a courtesy to other drivers.

 

Or if you do go head on .Not an overlap like this as this is the only time it can make a difference

 

Jeeezuz.....how the hell did that car ever make it to market? Looks like it is designed to purposefully kill the occupants.

 

You spent more time writing this responses than reading my initial post. My question is clearly and succinctly articulated in the original post.

I do not approach posts on an enthusiast forum with a “goal” and I do not really care if you CMC your truck, crash, and end up eating pancake batter out of a feeding tube for the balance of your days. I was just seeking input and opinions from the TW hive-mind on a subject that I have given thought to in regards to my own truck and the safety of my family.

Hopefully that clears it up.

 

Well, the stainless steel hood didn’t slice through the windshield and decapitate the crash dummies.

I guess that’s what success looks like.

 

No, but the rear of the car came forward, lopping their heads off regardless. Good thing these cars time-travel. Maybe you could go back to the point where you fell asleep at the wheel and wake yourself up?

 

I’m conservative for this reason, too. These trucks are engineered and crash tested in very specific configurations. They definitely aren’t tested with mods. They are very capable trucks stock and with minor mods like better rubber they’ll go just about anywhere, safely.

 

You're missing the overall physics of the concentration of force across the entire surface of the tire contacting the wheel well instead of being concentrated at the point fo the chop. You're thinking that since a chop was made in the corner that the integrity of the entire mount has been compromised. It hasn't, especially since the plates are welded back into place. Given that, energy dissipation isn't happening in just that one spot. It's being spread out over the back face of the tire as it pushed back into the wheel well and then that force travels to other parts before it gets into the cab. Not to mention that you have your air bags in play with a crash like that. There is a whole lot going on before the cab mount or the cab is compromised.

 

Just a little more caster from the camburgs to center the tire/wheel and viola. No CMC necessary.

 

Man.....never seen so many Toyota Engineers in one thread. It’s an embarrassment of riches here on TW!!

What I know, without being a Toyota Engineer (full disclosure here), is that making the mount narrower, alters it’s properties and strength, likely for the worse. Welding some soft-steel filler plate made from scrap metal to the vertical plane, likely does nothing to replace the strength of the overall, now thinner, mount.

Again, I could care less if y’all want to chop your trucks, but if no one has any real data on how it’s “just as strong” after a CMC, I think the rational answer is that it is not, being that dimensionally it is narrower in the direction where it needs the most strength to keep the wheel out of the cab in a crash.

Here is my “Official TW CMC Challenge”:

I’d like to see one member with a CMC to get a professional engineer “sign-off” on the change and present that document here.

 

Same. Never seen so many internet document readers converge and vomit all sorts of bs as if they build these frames with these materials and pay for the crash tests, and then run the numbers. On TW- people who read charts on the internet and then re- type them to other people. Yes.

I go swaybarless. I’m not afraid of every little thing. If if someone is looking for hard truth, it’s not here in this thread, and will not he here in this thread, no matter who attended some fuck ass college course.

 

It may have been Barcelona Red, or similar. It didn’t match my Indigo Ink taco very well. Thankfully, I don’t have talent for painting on canvas, so quickly gave it up. Twas from a mere scratch from my spectacles.