Twincharger 7DSG - Selects higher gear than it should. Thoughts?

[logger]

When the Twincharger 7DSG is operated in "D", it will readily run at lower revs and a higher gear than most of us are used to. As anyone who has one will know it will climb a hill in 7th gear at around 60kmh and 1300rpm.

There is a notion that with the Twincharger 7DSG operates at low revs in a high gear under load "..you are putting too much strain on it and that its bad for the engine."

At the moment I found the car up gears too early..Upgear too early like car driving 55km/h in D7 around 1200rpm, I can hear the engine clonking, not sure if that the right term. Sound like if you starting a manual in second instead of first.

That is the engine labouring, it's basically the engine crying for help because you're putting too much strain on it. It's bad for the engine in the long term.

Thats what I think too, it reminds me of my early days of driving a manual, where putting into 5th instead of 3rd or 4th instead of 2rd.

Not sure if other 7DSG drivers experiencing the same issue of having a higher gear than what it should be. At the moment I either drive it in S or if i see a hill coming, i would accelerate more, forcing the DSG to downgear(s)

I disagree with this notion for the following reasons:

1) you are applying anochronistic thinking to a a cutting edge piece of technology. We are not talking about a 20 year old holden with a manual transmission.

2) I find it hard so believe that VW would design a car with a highly advanced powerplant and automatic transmission and then forget to configure it, so that in its most automatic idiot proof setting "D", it will allow the driver damage it when driving uphill in a liesurely manner .

3)The ECU on the Twincharger and the 7DSG's Mechatronics unit will have all sorts of sensor imputs. I do not believe the designers would allow them to so readily operate in a regime where it could damage itself.

4) The engine is said to develop maximum boost (not torque or power) at a meagre 1500rpm so surely it is designed to run under load in this regime. see Inside VWs twincharger

5) My take on it is, the noise you are hearing is a characteristic of the Twincharger + 7DSG. It might be the supercharger or just the engine itself under load, but I reckon it is quite acceptable and I am happy to drive my car in this range until someone can give me a good reason not to.

As always - happy to proven wrong. Can someone with specific engineering knowledge of these engines clarify this for us? Thanks...

[sillygogo]

Logger:

I am not really sure what is the noise i am hearing. I believe it is because the DSG is in a higher gear than it should be because, the engine vibrates, and "sounds like" in the wrong gear. That was how i found the sunvisor was lose. She is smooth and sweet once it is in to 5 or 6.

I don't think it does any long term damages, however i do believe it is not running as efficent as it should be.

[mickofoz]

It's all perception. I currently drive a Polo GTI. I have always "driven" the car the way I thought it should be driven until I saw a video on the VW German website on how to drive a manual VW for max fuel economy. Basically if you follow VW's recommendations, you will end up in 4th gear by the time you hit 40km/h. I tried it and ended up with a 2l/100km saving. Sure, I thought the engine sounds like it is about stall, but after a while, it started to sound normal. Like I said, what we "THINK" it should sound like, is often not the case at all.

[Grover]

Yes the new VW 7Sp DSG does take "short shifting" to the extreme and while this may result in a fuel saving I do find myself constantly shifting to "Sport" mode for normal traffic light starts and some slow speed corners before shifting to normal "D" mode once it gets over about 30Kph. It just feels better. I think that the right config for me would be to just raise the rev range slightly for the 2 and 3 gear shifts.

That said, "Sports" mode is too much for normal driving cruising.

[pologti18t]

Best fuel efficiency in a petrol engine is moderate to low revs and throttle opened as much as possible (less pumping losses).

Essentially this means you need to accelerate with lots of throttle but upshift early. This is exactly what the DSG seems to be doing. Keeping the maximum load on the engine.

[Dub_Star_V6]

Buy a manual. Problem solved.

[logger]

Very Clever ...but seriously:
There is no Problem to solve in the first place. People are trying to make it one and I would like to clear things up, so a myth does not perpetuate.

So far no one has come up with a good reason not to let this powerplant and transmission operate within the manufacturers design envelope.

[blutopless2]

gee i thought the 6speed dsg in my jetta short shifted way too early...
its in 6th at 60kmh... roughly changes up a gear for each 10kmh increase.
Does the job tho and find that i have learnt when to use the manual mode.

[tinto]

a twin charged car doesn't seem to suffer for it.
The only thing it chews is fuel if you're not on flat ground (as mentioned in the other tune thread).

My gti (dsg 6) changes down much more readily than my tsi (dsg 6) did, but it doesn't have the supercharger supporting act

the dsg mapping for a tsi, tdi and gti are going to match the capabilities of the engine.

[tofo17]

It's all about fuel efficiency, chasing the poofteenth of a litre per 100km savings that consumers seem to love. Remember VW detuned the TSI from the MkV GT (120 something kw?) back down to 118kw. No doubt they've programmed the shift points as efficiently as possible.

[tinto]

^ on flat ground that is true.
Take it up a slight hill and the lack of down-shifting isn't fuel efficient.
Try it yourself

[VeedubTSI]

It all comes down to how you are driving. With all automatic transmissions, they go through a weekly cycle or however how often of re-programming themselves. Or possible from the moment you start driving.

The car learns your driving style through a 'fuzzy logic' (I know someone in this field of engineering who can confirm the existence of fuzzy logic) and adapts to your driving style. E.g. if you drive like a grandma the car will not inject as much fuel and will shift earlier, or if you drive harder the car will dump more fuel and downshift more eagerly, I found this evident and could be rectified in my primary car with taking the terminals off the battery to re-program it however do not do this on any VW as I have only verified this fix with Hondas to this date and I will not take any responsibility if you do it. However, it also depends on everything else such as flat ground, tyre pressure.

The 118TSI does sell on the merits of fuel efficiency and power as I've found with the 3 day old 118TSI it does have a 1 gear: 10kph shift point as I found myself cruising at 70kph in D7. Also upon coming off the line the DSG like any manual gearbox does take time to hook up the clutch as i find it dipping into the 900rpm range upon slight depression of the accelerator and the engine gets to the point where it wants to stall evidently in semi-auto and manual transmissions.

As for the rumbling I find it is like popular belief when driving any car, not feeding enough revs into the engine will cause it to stall and under load it will rumble as there is too much load. It may well be a combination of problems such as too high a gear and all, but this is what I think.

[Corey_R]

Welcome to the forums VeedubTSI.

This thread is a full 1 year old.
The OP, logger, has one of the most extensive DSG knowledges of people on these forums. His name is logger, because he has the abiltiy to log all the stats coming from the DSG. In fact he can prove via logs that the DSG mechatronics does not necessarily adapt to YOUR driving habbits, but rather adapts to the tolerances and wear of the gearbox itself. He can also tell you how to reset the DSG without having to take the battery terminals off.

And really, the purpose of this thread was to state that there, there is actually no problem... logger took a discussion out of another thread to show there was no problem, and when people had nothing more to add, it died a year ago...

[idaho]

Welcome to the forums VeedubTSI.

This thread is a full 1 year old.
...

I was thinking of replying as this was the first time I had seen the thread, but perhaps not. People are often berated for starting new threads without searching for and adding to existing threads, but it seems that searching and continuing on is also frowned upon. If a new group of posters wish to discuss this subject isn't it reasonable to continue this thread rather than start a new one?

[hooba]

I was thinking of replying as this was the first time I had seen the thread, but perhaps not. People are often berated for starting new threads without searching for and adding to existing threads, but it seems that searching and continuing on is also frowned upon. If a new group of posters wish to discuss this subject isn't it reasonable to continue this thread rather than start a new one?

To me it's obvious, nobody likes a smartie who can master the #$@%@! search function on this forum.