Another dead DSG, ...or maybe not?

[tigger73]

Is there anything we should avoid doing and is the DQ250 more reliable than the 7 speed dry clutch version?

I think you'll find 90% of the problems are with the DQ200 found in the lower power output models.


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[CardinalSin]

I think you'll find 90% of the problems are with the DQ200 found in the lower power output models.

That's a relief! Thanks.

[zei20t]

the DQ250 is 10+ years old now. they have finally ironed out the bugs

[Ryeman]

the DQ250 is 10+ years old now. they have finally ironed out the bugs

I'd like to know how the crank shaft can go fm 2000-1500rpm in milliseconds without any clutch wear in the process.

[VW Convert]

I'd like to know how the crank shaft can go fm 2000-1500rpm in milliseconds without any clutch wear in the process.

Clever German engineering? LOL

Never really thought about that but in my experience it works just fine. Always interesting to know the ins and outs of these things but I don't worry too much about the hows and whys, I just drive it and enjoy the experience.


Cheers

George

[zei20t]

I'd like to know how the crank shaft can go fm 2000-1500rpm in milliseconds without any clutch wear in the process.

they cut the ignition during the shift, so the engine is only using its own momentum to turn until its back in gear and ignition is started again. also, this causes the DSG 'fart'

[Ryeman]

they cut the ignition during the shift, so the engine is only using its own momentum to turn until its back in gear and ignition is started again. also, this causes the DSG 'fart'

Fuel I think.

Yeah I'd assumed that but the rotating mass is braking too quickly for that alone IMO

[CardinalSin]

Fuel I think.

Yeah I'd assumed that but the rotating mass is braking too quickly for that alone IMO

Surely it's no more of a load on the clutch than the same thing with a manual? Less really because, unless you're braking, the DSG changes down changes at the lowest possible point. Changing up, if they cut the fuel it's very similar to with a manual and backing off the throttle until the clutch is engaged except it gets it right every time and each clutch only gets used for 3 gears and runs in oil.

Perhaps the timing of the shift is how long it takes to shift from one gear to the next and doesn't include one clutch disengaging and the other engaging?

[Ryeman]

Hmmm.....rpm refers to the crank revolutions AFAIK.....it's a mystery to me still but if the 'box' lasts as long as the engine who cares.

[Blue103TDIDSG]

No No, you go first))
My theory is that the clutch that handles 2/4/6 doesn't engage until the road speed sensor matches the main shaft speed by application of the precise amount of fuel to the engine. Seeing there is no big deal with everything being digitally driven and monitored.
I guess as each through SAE articles will be the best way to research it.
A theory of mine is if Toyota use it, it must be bullet proof.
They don't!

Don't know about Toyotas being bullet proof LOL

But on the neutral thing whilst moving -
We have a fiat 500 Twinair and it has a similar gearbox, albeit only a single clutch - they call it a Dualogic gearbox
We were checking out a very slight vibration and to determine if engine related I just knocked it into neutral whilst going slightly downhill at about 75kph - engine went to idle and vibration continued - so not engine related
Then just put it back into "D" - well the Fiat equivalent

Well there was a huge "BANG" and bits of gearbox blew out under car and went everywhere -
Oil all over the place !!!

NO NO NO JUST KIDDING

As Ryeman says above - it just adjusted the engine revs to match road speed and engaged 5th gear without any noticeable change apart from an increase in engine revs
The truth is I never even thought about it as these days a car, or any other product for that matter has to be idiot proof

So if you can move the lever into neutral it will either do nothing and sound some alarm or will just do as requested and go into neutral. Putting it back into "D" I would expect it to do no less than the humble little Fiat and go straight into the applicable gear and adjust engine revs to suit and then drop the appropriate clutch - all in about 0.2 of a second

Struth - it won't let you remove the key if it's not in park - so selecting neutral shouldn't be a problem
Or if it is, it just won't do it

If I remember I will try it next time I'm out in the Yeti

Cheers