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The haldex controller controls the haldex clutch therefore controls when the drive is transferred to the rear wheels as well as ensuring it's disengaged when reverse is selected or the car is braking.

The uprated controller transfers more bias to the rear wheels quicker and in one particular variant keeps the clutch engaged during braking.

Uprated controller has selectable modes to vary slip angle and bias

Makes the car less understeery and in extreme cases gives more oversteer characteristics
 

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cuprabob said:
The haldex controller controls the haldex clutch therefore controls when the drive is transferred to the rear wheels as well as ensuring it's disengaged when reverse is selected or the car is braking.

The uprated controller transfers more bias to the rear wheels quicker and in one particular variant keeps the clutch engaged during braking.

Uprated controller has selectable modes to vary slip angle and bias

Makes the car less understeery and in extreme cases gives more oversteer characteristics
True for the mk5.

But for the mk4 there is no selectable program, no switch inside the car.

mk4 Haldex upgrade has two options.

Blue or Orange

Blue is the most common. Blue works by reacting faster than the OEM controller, by taking throttle pedal postion into consideration, and therefore 'anticipates' the onset of slippage, rather than simply reacting to it. This gives the car a much more neutral balance under power. It doesn't alter the amount of power going to the rear, that's impossible with the haldex system.. It's simply about applying 4wd more often, and more sooner and therefore it feels much better when you hoon it around.

The orange controller is the same as the blue, BUT with the added extra of not immediately disengaging the rear wheels when you
a) come off the throttle
b) dip the clutch
c) press the brakes

This has added benefits - you get more control under extreme trail braking, but some people has said that it causes axle bind when maneovaring (sorry crap at spelling!) at slow speeds.

For a mk4 Golf, the blue haldex is the best day to day upgrade. I've had mine now for maybe 50,000 miles and simply love what it brings to the car
 

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This is what the blue controller does to the mkIV R32!

 
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