TRD Motion Control Beam

[venturaII]

Originally Posted by Tokay444

People think "maximum rigidity!!! Because race car!" That's not the case. The stiffer everything gets, the more of a propencity for the car to slide there is.

Again, you're applying suspension principles to chassis design. Two different areas.

[Tokay444]

I'm not applying suspension principles to chassis design.
The chassis needs flex. If areas don't flex, other areas break.
Carbon tubs have engineered flex points.

[venturaII]

Done.

[strat61caster]

Originally Posted by Tokay444

It's most certainly more than that. I'm willing to bet it's in the tens of thousandths of an inch. The oem bar has no preload adjustment.

Per the previous discussion; less than 0.1mm of deflection.
http://www.ft86club.com/forums/showp...5&postcount=45

0.1 mm = 0.0039"

Thickness of a sheet of paper: 0.005" give or take.

[Tokay444]

Originally Posted by strat61caster

Per the previous discussion; less than 0.1mm of deflection.
http://www.ft86club.com/forums/showp...5&postcount=45

0.1 mm = 0.0039"

Thickness of a sheet of paper: 0.005" give or take.

Does it go into detail how that summation was derived?

[strat61caster]

Originally Posted by Tokay444

Does it go into detail how that summation was derived?

[Tokay444]

It's fine. I'll mount an indicator on the fire wall and go for a drive and measure shock tower deflection. If it's less than .005", I'll be very surprised.

[strat61caster]

Originally Posted by Tokay444

It's fine. I'll mount an indicator on the fire wall and go for a drive and measure shock tower deflection. If it's less than .005", I'll be very surprised.

Fuck, statements like this are how I get suckered into two hour meetings about this shit. Looking forward to the results.

[churchx]

Tokay444: You have bushings & suspension for parts where movement/flex is needed "for things not to break", "for car to be more comfortable" and to keep grip un uneven road surfaces. In chassis however extra flex in most cases just rob you of control. Yes, it also may impact grip, but it's much better to get that grip with appropriate suspension changes, then with reducing chassis rigidity. There is reason why manufacturers always boast about strengthening chassis vs older generations as an achievement in PR materials whenever they stiffen up chassis with slight redesign or usage of stronger steel.

[Tokay444]

Originally Posted by strat61caster

Fuck, statements like this are how I get suckered into two hour meetings about this shit. Looking forward to the results.

Two objects that are tied together mind you.

[gramicci101]

Originally Posted by strat61caster

I don't get paid enough to argue about things that move less than the thickness of a sheet of paper at work, much less here. I'm out.

Oh yeah? Well I say that you DO get paid enough to argue about things that move less than the thickness of a sheet of paper! What do you say to that, huh?!

[Tokay444]

Originally Posted by churchx

Tokay444: You have bushings & suspension for parts where movement/flex is needed "for things not to break", "for car to be more comfortable" and to keep grip un uneven road surfaces. In chassis however extra flex in most cases just rob you of control. Yes, it also may impact grip, but it's much better to get that grip with appropriate suspension changes, then with reducing chassis rigidity. There is reason why manufacturers always boast about strengthening chassis vs older generations as an achievement in PR materials whenever they stiffen up chassis with slight redesign or usage of stronger steel.

The reason they release articles like that for PR, is because people who know nothing about engineering buy into it.
Also, strength doesn't always mean rigidity.

[EAGLE5]

Originally Posted by go_a_way1

Haha good idea. Next time you are taking a corner hard push your finger in between the dash and door, you will feel it flex and squish your finger, with TRD door stabilizers this is reduced significantly

Door flex is not the same as chassis flex. Doors are only a part of the chain. So check that tire. See if opening the doors makes it hit the ground. If it does then we know there's a lot of flex without the doors. I really wouldn't expect a big difference in our stiff little cars. Not sure what the Nm/deg is, but I imagine it's well north of 20k.

[EAGLE5]

My understanding is that stiffness/rigidity is how little it bends/deflects for a given force, and strength is how much force it can take before breaking. We're talking about rigidity here.