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Economy/performance issue after VW cheat software update

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Posting this on behalf of a mate. He has a 2010/11 VW Golf diesel. As part of the VW emissions recall he had it done at the local main deal. Straight after the new software update was done he has noti… Read More
marty-401 Avatar
3m, 2w agoPosted 3 months, 2 weeks ago
Posting this on behalf of a mate. He has a 2010/11 VW Golf diesel. As part of the VW emissions recall he had it done at the local main deal. Straight after the new software update was done he has notice a big drop in economy (at least 15% less mpg) and a drop in performance. He has taken it back to the same dealer and they say all is good and no fault codes.

He has checked online and a few others have the same issues.

So does anyone on here have any ideas? Thanks.
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marty-401 Avatar
3m, 2w agoPosted 3 months, 2 weeks ago
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#1
Isn't this what the update does, gives you the true MPG reading and not the inflated incorrect value? Or maybe they have restricted the performance to decrease emissions? I'm guessing they have had to do it to comply to ruling, to save the government increase car tax on the cars later on.
#2
Got the letter over a yr ago but ive not had it done for that very reason
#3
I just typed a lengthy answer and it vanished as the question was moved to ask. Not typing it again. Basically, that's what will happen after the recall
#4
Just reading online and says it restricts fuel usage, so in turn will decrease performance as not as much firing in cylinder. Some have said using higher premium fuel gives a slightly better performance.

Ref : http://www.honestjohn.co.uk/news/volkswagen-emissions-scandal/8-reports-of-volkswagen-tiguans-losing-power-after-ea189-emissions-fix/
#5
But his tank of fuel does less miles than before and the performance has dropped. Surely a lower performance would give more miles to the tank?
#6
This was always going to be an issue with this situation. VW Group would not have taken the massive risk to modify the software on these cars to meet the standard when tested and operate differently when not being tested if there wasn't some tangible advantage.

I would suggest on the face of it he's snookered, going to be very difficult to prove there has been any detrimental effect as a result of this update. If you can get enough people together (which given the might of VW fora should be possible) along with a greedy legal counsel there may be a chance to bring a case but it's not going to be easy.
#7
marty-401
But his tank of fuel does less miles than before and the performance has dropped. Surely a lower performance would give more miles to the tank?

That doesn't follow.
#8
My 1.6tdi golf is on recall too but I'm not going to do it just yet as it doesn't bother me, also holding out for proper compensation too.
#9
Not really, as less power and performance makes the car take longer to get to speed therefore using more fuel. I went from a 130bhp to a 90bhp hoping to save fuel, but found I use more fuel and have less fun! The recalls were all about emissions so vw will sacrifice your performance to meet these standards.
#10
Stu
marty-401
But his tank of fuel does less miles than before and the performance has dropped. Surely a lower performance would give more miles to the tank?
That doesn't follow.
Basically he can't get it to accelerate as fast as before. So you would expect it to be using less fuel.

Edited By: marty-401 on Feb 09, 2017 20:35
#11
marty-401
But his tank of fuel does less miles than before and the performance has dropped. Surely a lower performance would give more miles to the tank?
No. Less performance does not equate to greater efficiency.
#12
VW can't just reduce the cars power - it was sold as a car that would do a certain bhp/speed and MPG,
if they deliberately reduce any of those variables, surely the car owner is entitled to a refund as they are no longer getting what they paid for?? Its just as bad as the emissions scandal itself if so.
#13
marty-401
Stu
marty-401
But his tank of fuel does less miles than before and the performance has dropped. Surely a lower performance would give more miles to the tank?
That doesn't follow.
Basically he can't get it to accelerate as fast as before. So you would expect it to be using less fuel.


Decrease performance + heavier right foot = more fuel being used.
#14
The performance has been reduced to bring the emissions inline with permitted levels. The economy issue is just a consequence of the engine working harder to push the car along.

Probably shouldn't have had it done. Only thing he can do now it get a tuning firm to flash the ECU back to factory standards.
#15
marty-401
Stu
marty-401
But his tank of fuel does less miles than before and the performance has dropped. Surely a lower performance would give more miles to the tank?
That doesn't follow.
Basically he can't get it to accelerate as fast as before. So you would expect it to be using less fuel.

No mate, it's not as simple as that.

As an example - If you see an old diesel banger going down the road with smoke pouring out the back it will be under performing and using more fuel because it is over fuelled.

If, as I have been reading, torque is reduced this will likely be why he's got worse fuel consumption.
#16
The UK government has let VW owners down here. In the US VW are buying back all the diesel cars from their owners and will no longer sell diesel cars in the US.

The only action, so far as I am aware, taken by a UK authority is that of the Mayor of London over loss of Congestion Zone revenue which frankly was a pittance for a half arsed ill thought out claim.
#17
Stu
The UK government has let VW owners down here. In the US VW are buying back all the diesel cars from their owners and will no longer sell diesel cars in the US.
The only action, so far as I am aware, taken by a UK authority is that of the Mayor of London over loss of Congestion Zone revenue which frankly was a pittance for a half arsed ill thought out claim.
What a surprise uk customers get stitched up and the government does nowt. I honestly don't know why anyone would buy a vw group vehicle in the uk after seeing how the USA customers were dealt with compared to the uk.
#18
plodging
Stu
The UK government has let VW owners down here. In the US VW are buying back all the diesel cars from their owners and will no longer sell diesel cars in the US.
The only action, so far as I am aware, taken by a UK authority is that of the Mayor of London over loss of Congestion Zone revenue which frankly was a pittance for a half arsed ill thought out claim.
What a surprise uk customers get stitched up and the government does nowt. I honestly don't know why anyone would buy a vw group vehicle in the uk after seeing how the USA customers were dealt with compared to the uk.

There is likely to be an affect on residual values of diesel cars because of this and the sometimes misguided view of the population on the emissions of diesel cars. Silly unfounded stunts like doubling the cost of parking a diesel car in London are well wide of the mark and do very little to address the problem.
#19
why did he go in for a software update when he car was fine. it was obvious that this will happen they basically use more fuel and less power to burn the emissions that were just being let out of the exhaust and know they need to let u less fumes so either the exhaust needs to be modified or the software needs to be changed so more heat is produced to burn those emissions. bit pointless as car will use more fuel give less mpg and less emissions and aswell the emissions test is stupid it should be for a distance of travel not just how many at certain rpms over certain time.
#20
I had my 2.0tdi passat done, was getting around 43mpg around town before and I'm now getting around 37mpg. I've also noticed that it doesn't have as much 'kick in the ass' torque as it had before when I put my foot down.

But hey, at least they gave me a free official vw umbrella, keychain and pen :|
#21
get it remapped to around 200bhp and bill vw
#22
What VW did was cheat on the emissions, what they have had to do is effectively retune the engine to meet the emissions target, this means less power AND less mpg.

In just the same way the catalytic converter strangles the engine and reduces power and mpg; all in the name of reducing CO2 emissions.

VW werent alone, nor were they the worst; a number of makers are quietly having engines retuned during services, and paying the US government massive fines; of course the UK government are sticking to their original VW lie, that none of it happens here.

Fiat, Mercedes, Hyundai, Toyota, Volvo, Renault, Audi; those are some of the names I seem to remember from the original list of cheaters.


Edited By: Gentle_Giant on Feb 09, 2017 23:55
#23
Volkswagen have just become no.1 car maker in the world perhaps thanks to all this publicity despite it being negative and they can simply detune a car to reduce its performance and efficiency but lower emissions and walk away despite this surely voiding the contract of sale for a false claim of specification. People should be able to return the car and just say 'refund please'.

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