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My experience is that there is almost certainly a different reason that you are claiming for the change in revs when neutral is selected. You seem to have made your mind up - all good. As I said - your story, tell it all you like. I KNOW what a grabbing clutch smells, sounds and feels like. Nothing in your description adds up to that in my experience.
This is the problem as I see it. We're all looking at a black box and trying to explain what we're seeing without fully knowing the internal working of the black box.
Everyone has their own theory but unless you're the maker of the box and know how it works then it's all just theories and hypothesis.
No discussion in this thread is ever going to resolve this so we're best off agreeing to this and moving on.
As to whether it is required to move the transmission into Neutral I'd be referring to the owners manual and there is no mention of moving the selector to neutral in the manual. If you are going to be stationary for an extended time I'd personally put the car in P with the handbrake on as then the car is being held rather in N it still requires application of the foot brakes.
Based on discussions with a friend of mine who works at VW, moving the selector to neutral when stationary has the same effect as a firm foot on the brake pedal ie; the DSG clutches are fully disengaged. In Drive with no foot on the brake pedal or on the accelerator pedal then the ECU assumes that you want to crawl forward at a very slow rate, obviously after the hill start brake hold disengages. The gear indicator will show D1 or D2.
I don't get the "mystical magic" stuff that floats around about DSG's. They are just a manual gearbox with electro hydraulic clutch actuation, that's it.
This differs to an automatic gearbox with a torque converter (TC) which always transmits some power. TC's are a fluid coupling between the engine and the transmission and as such heat up the fluid whenever there is a differential between the engine rpm and the gearbox rpm. Which is why they need a transmission cooler. Moving an automatic gearbox to neutral disengages the gears (bands) which is why the loading changes, but the TC is still engaged.
Cheers
Gary
Sigh...... and if my posts were actually read in their entirety, I've made it clear several times that I'm not talking just about the change in engine revs, when shifting D to N while stopped. I pretty clearly described other effects that I (and others) have noticed - but whatever.
What my original post was asking, is can anyone in the know actually confirm or deny if the story about the DSG oil-pump (if there even is such a thing) actually stops pumping, while in Neutral - and therefore it's recommended NOT to sit in Neutral for prolonged periods of time... or is this just a myth?
My MK6 R which I had for 7 years and did 120,000km never had a transmission issue.. I never put the car in neutral when stopped, drove to the city in peak hour traffic 3-4 days a week in those 7 years..
If you read the manual it says not to tow the car in neutral because when the engine is not running there is also no lubrication of the gearbox and this can lead to a failure.Quote:
Originally Posted by Spinifex
It doesn't mention anything about lack of lubrication when the car is running but suggests not putting the car into neutral when going downhill as then you'll be relying solely on the brakes to slow you down and not using the engine to keep the speed in check.
So only issue is when moving the car when the engine is off. You want to put your car onto a flatbed truck rather than your traditional tow truck that just lifts 1 set of wheels off the ground.
Would this be an issue if the rears were lifted and front wheels were rolling on the ground? Can we assume if front is lifted,the rear Hadlex clutch pack is depressurised and disengaged, it’s apples?
I'm almost sorry I asked the question, didn't think it would cause so much controversy but thanks to all that have given lots of varied and informative views. I suppose that's what these forums are good for.
I put it into sports mode in snails pace traffic. Holds gears longer and no jerkQuote:
Originally Posted by iDiesel
Ask the question the other way, why would there be a neutral if VW knew it would damage the box? In reality the car selects neutral when it comes to a halt when the first motion shaft between the motor and box stops spinning, all manual cars do this as it is the drive splines on the clutch plate that causes the gearbox to engage with the motor. When this happens and the first motion shaft stops nothing in the gearbox rotates or pumps anything unless the oil pump is electric.Quote:
Originally Posted by Spinifex