If heat is given off it has to have an effect as the heat finds it harder or easier to dissipate like the processor on a computer a hotter climate requires more cooling or its peramiters chiang causing it to over heat and fail, I'm not saying it's a problem for the vcu but it must by the law of physics have an effect..

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For me the most interesting points were

'It works in about 1/10 second or 1/4 turn of the wheel.'

That is what I have been trying to find out for a long time.


Good to know it works pretty quickly.

Epicuser said:

For me the most interesting points were

'It works in about 1/10 second or 1/4 turn of the wheel.'

That is what I have been trying to find out for a long time.


Good to know it works pretty quickly.

Click to expand...

thers a lot of useful info in the FAQ that came from - if peeps could read it .

The Mad Hat Man said:

thers a lot of useful info in the FAQ that came from - if peeps could read it .

Click to expand...

Where is that FAQ then. I can't find the info in your thread everything you need to know.

http://www.landyzone.co.uk/lz/f38/definitive-freelander-vcu-testing-thread-99163.html

Dont yu guys ever look in the Common Faults and Questions fred?

I do, but don't remember everything.

If you check my signature it links to your thread.

Ah - so blind and Stoopid?

I have sigs turned off - too many peeps have miles of crap .

Im still pretty sure that actual ambient heat has no effect on the vcu fluid......I have read MHM thread and am some what dubious with the graph pic .......Im pretty certain that if I heated the vcu fluid directly...by putting it in an oven at 100c...this would not change the thickness off it......I think people are getting confused with the temprature and thickness aspect of this fluid.......

Now shearing is how this fluid works....

Rubbing it together thickens it.....and in the process of this rubbing heat is generated....just like playing with ya knob...

When you stop playing with it...the friction (shear) is reduced and so it cools down, as does the swelling

If you rub it too much.......to the point of no return (300c apparently) it will swell up and stay swelled up until an ointment is applied (cream, new fluid etc)


I think people need to understand shear when thinking of a vcu fluid...Some engine oils have added phosphorus to help with wear, as the shearing effects of some engine components will just obliterate conventional oils.....

Vw Pump Duse diesel as and egsample...

Heat is a side effect of the sheering process.

The theory of the turnip test is to measure the ambient temp of the vcu having not been driven for many hours, v the temp after a short drive of say 3 to 4 miles. The tempt difference being an indication of the sheering effect taking place or not. As the sheering process produces heat, therefore we expect the vcu to get hotter if it's working/slipping/fighting as it should. This sheering heat would add to the original ambient heat of the vcu.

The heat we measure with our infra red thermometer's on the outside of the vcu is only an indication of the heat inside. It's hoped it's proportional in value. But it's certainly not the same as the temp inside.

The vcu temp being too high became a concern due to re-conners suggesting the fluid in the vcu is feked if the vcu gets too hot. 70 degrees plus was a value that springs to mind. It was suggested that too hot means feked. As if the fluid somehow overheats or burns leading to failure of the vcu.