xTTz

I always thought my 225 QC is 4/all wheel drive. But my friend insists that it is actually front wheel drive and only works as 4 wheel drive in certain situations... Who is right???
Thanks!

MaxHedrm

Your friend.

dougie

both of you are right.

blackfnTTruck

will send power to the rear wheels, something like 65% front 35% back. There are replacement Haldex controllers that switch to 50% front 50% rear, I believe.

blackfnTTruck

<ul><li><a href="http://www.haldex-traction.com/default.htm">Haldex</a></li></ul>

JohnLZ7W

the more common setup that is seen around here is the race controller which is a faster responding unit. Instead of waiting for wheel slip to occur it can transfer torque based on throttle position. IOW, if you mash the gas it'll start sending power to the rear axle before the front gets overloaded and starts to run out of traction.

jonchavez

I believe the quattro function disengages above 50MPH.

jonchavez

It absolutely does...(work above 50 mph)

and i can prove it....snow this past winter at 60 mph...down shift and the rear steps out when power is apply....

also, i have done this in snow, sliding the car, and standing on the throttle...wheel spin, snow everywhere...speedo reads 60mph, but i am doing 30, maybe 35...i let off the gas and the car straightens out...

Remember, haldex is not traction control...its four wheel drive....

Now the amount of power trasferred is directly related to the amount of traction...so you may only get 20% transferred to the rear with good traction, and more with less traction...

blackfnTTruck

<ul><li><a href="http://www.eiptuning.com/eip/haldex_popup.html">http://www.eiptuning.com/eip/haldex_popup.html</a</li></ul>

Audiboy

causes spikey and abrupt readings on independent roller inertia dynos.