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FCP Euro

VS Legend

Member Since 27 Dec 2002
Offline Last Active Yesterday, 08:53 PM
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Posts I've Made

In Topic: New Horns

Yesterday, 08:30 PM

Linking to Amazon again because of the fantastic feature list there:

Quote

  • It's so loud, you'll make soccer moms on cell phones pull over to cry.
  • You will want to find a way to string 4 or 5 of these together for the ultimate MEGA HORN!
  • People won't know it's you who honked... they'll be looking for the semi truck.
  • That deaf old geezer driving slow might actually hear you now.

http://amzn.com/B003JO2AAC

I know this will sound like a joke, but serious question - would a horn upgrade on my XC70 require a computer software update or special computer module connection or anything? It wouldn't surprise me, but if not I may actually do this. I like leaning on the horn for 5 minutes after Indian chicks in hatchbacks cut me off pulling out of Dunkin Donuts on the highway. This would make it far more effective.

In Topic: Poll: Which 'font'/logo Looks Best?

Yesterday, 08:23 PM

An OH moderator has instructed you to give up your dreams. DO IT NOW OR ELSE!!!!

In Topic: Poll: Which 'font'/logo Looks Best?

07 February 2012 - 06:32 PM

I think all of those are a bit tough to read. At least for me. Sorry!

I would drop the surfers in the letters, the logo is enough. Maybe reduce the weight of the font that's already being used under the "R" so that it is more readable. Perhaps less italicized.

Simplicity is king when it comes to logos. It should be unique, to be recognizable, but not so complex/busy that it distracts from the rest of the content it is beside.

In Topic: Psa: Do Not Try Handbrake Drifting In Your Awd Volvo

07 February 2012 - 06:21 PM

View PostDeimos, on 02 February 2012 - 08:17 PM, said:

And as far as them locking up, they don't have a lock up mechanism exactly

The coupling may not be locked up, but there is a Centrifugal Lock-up Mechanism that performs some sort of lockup involving the freewheel. I posted on swedespeed looking for more info on it.

In Topic: Psa: Do Not Try Handbrake Drifting In Your Awd Volvo

02 February 2012 - 07:19 PM

View Postozzimark, on 01 February 2012 - 10:51 PM, said:

No, it's a viscous coupling because it relies on fluid visocity to transfer the torque through the unit. Think of a bunch of plates spinning next to each other in a thick fluid.

Well, to be fair, the heat, generated by the shear/friction of the spinning plates, is what increases the viscosity/thickness.

So it is true that the heating of the fluid is what causes power to be transferred.


View Postozzimark, on 01 February 2012 - 10:51 PM, said:

However, I am pretty sure that on the VC AWD systems, there is a lockup that engages if the fluid gets too hot so you don't burn up the VC unit.

Is there? I thought that if the fluid rises to a certain temperature at a normal rate, it becomes almost solid and the shear/friction is eliminated because the plates beginning to spin at the same relative speed again. In other words, there should never be enough shear/friction to cause overheating unless you are dealing with an extremely powerful engine or locked-up wheels.


View Postozzimark, on 01 February 2012 - 10:51 PM, said:

The VC unit transfers torque from front to rear when the fronts are spinning faster than the rears, regardless of clutch state. If the rears are locked and the fronts are spinning, that'll cause the VC unit to do its thing.

View PostDeimos, on 02 February 2012 - 03:21 AM, said:

The clutch disconnects the engine from the drivetrain, transmission and beyond. But that's not where the potential for damage in AWD appears, it's between the front and rear sections of the drivetrain. This is also why you have to flatbed tow almost all AWD cars.

Problem is, even with the engine connected, the drivetrain is all connected to itself still, and the vehicle's speed actively drives the drivetrain. So a major speed differential will cause, in the old AWD, the viscous to seize up, drive the rest of the wheels, and if it can't it will go pop pretty quick.

That makes sense. Would love to know more about how the freewheel works to understand if clutch-in engages "coasting mode" / freewheel. Thank you, andyb5, for posting what you did. I had only seen an older document on the same systems with less info.


View Postozzimark, on 01 February 2012 - 10:51 PM, said:

I'm not 100% on this, but I bet the lockup unit just senses input rotation direction for the reversing lock-up function.

Would love to find out if this is how it works or not. Currently, all I know is that a vacuum actuator is involved. :ph34r: Looks like it should be right after the cut off in that image from andyb5. :glare:



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