need ideas about homemade haldex control

[Adversary]

at this moment I drive at this "sistem", like one shown on this pictures. when I need I turn on haldex pump on switch, and have 4x4

http://www.volksforum.com/albums/fil...5092007091.jpg

http://www.volksforum.com/albums/fil...5092007089.jpg


I know it's not recommended to turn on/off haldex pump while driving, so I would like to make another sistem, to control the valve

I need simple control, not active control, just to have something like 50/50 and 100/0, which I can use by switch from inside the car (so MHR from SQS is not option for me). also, I'll avoid expensive standalone haldex controllers

just need ideas how to make own sistem to have 50/50 and 100/0, while controling haldex valve, not just turning pump on/off. maybe somebody here already done it..

maybe to try some selenoid which can close and open (and also withstand haldex pressures), to act like a haldex valve?

any ideas and examples are welcome

[rjc69]

i plan on bypassing the valve and controling the pump as a way of turning on/off the rear diff lockup. i'm installing a 00' tt tranny and rear diff into an 88 jetta coupe'. i have, and will not install, the electronics the factory haldex ecu wants to see.... i plan on putting 12volts to the pump directly with secondary controls, 1: parking brake light switch, second, an adjustable resistor on the dash to control the amount of rear lockup. aside from needing to change the fluid often, i can't find a reason why this won't work....

[Adversary]

I heard it's not good to bypass valve and just turn pump on/off

as I know pump is not designed to run on 12V full time.. it can fail

can you describe better - "parking brake light switch, second, an adjustable resistor on the dash to control the amount of rear lockup." ?
you can control stepper motor by that way or ?



I'm thinking of use some selenoid instead of controller. selenoid that work on 12V power, can withstand high haldex pressure (how much is the haldex highest pressure, 50 bar ? )
because I need only two modes, 100/0 and 50/50, with open selenoid it would be 100/0 and with closed it would be 50/50

[rjc69]

We need to figure out exactly what voltage the pump, and valve motor run on.

[rjc69]

if someone knows what the actual haldex pump voltage, as well as the haldex valve voltage is, please post it here..... If we can get those numbers, a manual haldex controller becomes a VERY EASY thing to build.... a couple of resistors, a variable pot switch, poss a relay, etc-etc-etc. this solution would be MUCH easier for those of us who don't have, or don't want all the extra BS that goes along with a factory haldex controller....


Please chime in if you can provide this simple info....

[rjc69]

You can't tell me no one knows this information.... All I would need is about a half hour with my hands on an Audi Ty, or an R32 to find out what the pump voltage is. As far as the valve control motor. I have one, would like to have a couple more to test on. Simple add voltage, see when it stops. It base to be 12v or less...

[Royce44]

Thread from the dead revival. I was looking into this today, found a very good guide explaining in detail how it works, like the guys above have suggested i think it should be a relatively easy way to get permanent 4wd on demand, braking system etc can be wired in series to i stantly cut out to let abs do its job easily. Out of interest did anyone go ahead with this?

Royce

[raddo]

Also interested in this

[Royce44]

Heres the link of how the haldex works

http://www.vaglinks.com/Docs/VW/Misc...StudyGuide.pdf