Chat & Social > The Bar - General Chat

can we please clear something up?

(1/7) > >>

boss:
i was at a platday a while back and a guy we know broke a halfshaft in his 110

"how you do that?" i asked

"i pressed the brake"

"why?"

"if you lose traction through a diff, press the brake and it stops that wheel spinning like a difflock"

"......well thats not true is it"

"yes"

"no becasue your breaking on the wheels in equal ammounts adding resistance to the "risisting" wheel"

"yes but your braking on the spinning wheel.........it does work. i pressed the throttle aswell which is what broke the shaft"

***confused and annoyed expresstion on my face***



i was going to continue the argument becasue i was convinced i was right, but the rest of the club qued in backing mr left foot braking. then thought ok must be something im missing here and left it alone. this totally slipped my mind untill i read the same thing in a magazine just now.....i dont follow the "its on tv....it must be true!" or "its in a magazine.... it must me true!" rule.so i am again convinced that this is a retarded idea! deployed the lego model.......still doesnt work.


am i missing something here? or can a large amount of people be collectively stupid?


your thoughts please

Disco Matt:
My view would be much the same as yours - I understand that this is how traction control works off road (by selectively braking spinning wheels) but when you push the pedal down you apply more or less equal braking to all the wheels.

Given that it seems prone to snapping halfshafts I've never felt the urge to try it!  :lol:

V8MoneyPit:
Thinking this through.....

If you have the vehicle sat on a hill and the brakes on, stopping it moving. By gradually reducing the brake force, at some point the vehicle will start moving with the brakes still partially applied. Now, if one wheel was off the ground and you did the same thing, the wheel still in contact with the ground would start moving while the dangling wheel remained stationary (differential in motion). I think this is where the theory comes from.

However, if you translate the gravity forces in the example above to throttle through the transmission, it doesn't work. In this instance, the torque will be transmitted through the path of least resistance. In this case, both wheels have equal brake forces (this cannot be changed since the hydraulic pressure is equal across the axle), but the dangling wheel has less resistive force from the ground, so it will spin before the grounded wheel moves.

Myth.

As far as breaking half shafts goes, this occurs when there is a torque applied at one end and a resistive force at the other. So, giving it some beans and stamping on the brakes makes it about as likely as you can get to break a shaft!

boss:
exactly my thinking! HA! IM NOT GOING MAD!

V8MoneyPit:

--- Quote from: boss on August 12, 2010, 16:52:17 ---exactly my thinking! HA! IM NOT GOING MAD!

--- End quote ---

How can you go something when you already are?  :P :lol:

Navigation

[0] Message Index

[#] Next page