Volkswagen under investigation over illegal software that masks pollution

[theresanothersteve]

...What I have noticed since the recall is the engine runs faster at motorway speeds. At 100km/h, the engine now runs at just a tick under 2000 rpm. Previously, I recall it used to be around 1800 rpm...

Makes no sense unless they changed the gearbox, diff, or wheel sizes. Or anything else that changes the overall gearing.

Is it changing into top gear post update?

[VW Convert]

What I have noticed since the recall is the engine runs faster at motorway speeds. At 100km/h, the engine now runs at just a tick under 2000 rpm. Previously, I recall it used to be around 1800 rpm.

Whilst I can accept that fuel consumption may have increased, it is a physical impossibility that engine RPM for a corresponding road speed to change unless transmission overdrive ratio or diff ratio or tyre rolling radius is changed. Installing a new engine management program cannot do this.

Cheers

George

[buzzvic]

Perhaps I remember wrongly pre update as I was not expecting the recall and hence was not paying particular attention to these things.

The first thing I noticed was the FC was increased. I did not pay much attention until I was in the M7 one weekend and noticed the engine speed at 2000 rpm at 100km/h.

I did change to a new set of tyres (same specs as the original) a week before the servicing but I doubt the diameter sifference between a worn set and a new set of tyres would be significant.

Perhaps it has always around this engine speed and my brain trying to rationalise a reason for the increased FC.

[Transporter]

Maybe winter fuel has something to do with it as well.

[VW Convert]

The other thing is if the flash has changed the speed or resistance point for top gear in the dsg to engage. Certain 6spd cruisers in the first batch had a similar problem where 6th wouldn’t engage until you where doing over 100kph. Toymota fixed that.
So if vw made it so 7th didn’t engage until either 100kph plus or very light accelerator pedal , you end up in 6th doing higher rpm using more fuel.

AFAIK, this vehicle would have a DQ250 6 speed DSG rather than a 7 speed, these are generally programmed to engage 6th gear under normal conditions i.e. not heavy throttle at around 60-70 Km/h and would be well and truly in 6th well before 100 Km/h when cruising on a freeway. If you're suggesting VW have made a change that increases the speed at which 6th engages by somewhere up to 30 Km/h I think you're way off the mark.

Cheers

George

[Umai Naa!!]

Considering the gearbox is not flashed as part of the recall, I'll also submit a vote for BS.

[buzzvic]

I had the DSG serviced as part of the 60k service when the recall was applied. Not entirely sure what was exactly done.

Yes, it is the 6sp DSG model.

Anyway, it is more than likely that my recollection prior to recall is not accurate.

[Umai Naa!!]

They replace the oil and filter as part of the service. It's not flashed.

The recall is entirely a seperate thing.

[VW Convert]

There are several who are reporting increased fuel usage, and for people to throw insults without any other suggestions, solutions or ideas for that increase is typical childish bully boy behaviour.... You would think people would know better, but I guess that’s why they want to kill this thread.

I don't see anybody insulting or bullying buzzvic, I do see people questioning (as they are entitled to) his assertion that the road speed at a given RPM had changed, something that is a physical impossibility for a re-flash of the ECU to cause.

Cheers

George

[buzzvic]

To be honest, it does not bother me as this is the nature of the internet and forums.

However, perhaps some members here may aassume that I am trolling the issue which is not true. My only intention is to share my experience and as I mentioned, my recollection may be wrong.

From my perspective, there is no point continuing this discussion in this thread. I have asked a question in the Passat thread and someone indicated that a similar question has been asked in Facebook (which is definitely not me, unless someone asked on my behalf).

Makes me wonder about the issue if someone else is asking a similar question in a different forum though.