What is your concern? It's not the best AWD system. If you're not rally racing it's plenty good enough.
long story short, cars with haldex are fwd biased, that is the car will behave as a fwd until it detect slippage in the front wheels. As a result you save fuel, but you don't have an awd button you can turn things on. Prior to gen 4 (which is the one in the 2012 Golf R) apparently the system was relatively slow to react and couldn't send much torque to the rear. With gen 4 and above the rears are engaged before actual slippage happens through some sort of magic. Plenty on the interwebs to read if you really want to. Also, search for the HPA comp controller if you want a more sporty feeling or the UM (United Motorsport) flash of the stock unit.
What is your concern? It's not the best AWD system. If you're not rally racing it's plenty good enough.
:word:
So what exactly does flashing the Haldex system achieve?
it turns it into something close to the HPA competition version. It'll make the system more sensitive, engage the rear under hard acceleration and also use torque transfer on the rear during hard breaking. This link is from the gen1 but the deal is pretty much the same http://forums.vwvortex.com/showthread.php?6947845-United-motorsport-performance-haldex-software
There's a piece that will fall apart over time, the giubo, consider replacement as maintenance of the awd system. http://forums.vwvortex.com/showthread.php?8005049-Does-this-look-shot-to-you-guys
I own a Quattro Q5 and my golf r. I've driven both in deep snow. I'd say the gen 4 haldex is every bit as capable in street and dry track driving as Quattro.
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