Thread: VW caught by the Yanks for breaking emission laws

Gotta say the Puma Defender doesn't seem to blow much compared with our previous 300Tdi, which was pretty smoky at startup.

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Originally Posted by isuzurover

My contacts in the European automotive industry are sure it is not limited to VW.

I have been surprised how much soot I have seen D3s/D4s/RR_Sports emit while driving around.

However for the EU regs (which we also have in Australia), a manufacturer could program a single map to meet emissions at low acceleration rates (as used in the test regulations) but still have plenty of power in the top end. This would not strictly be a "defeat device".

The US/CARB regs were a lot more stringent and use much more realistic acceleration rates, hence the 2 separate maps.

This is a good point,it can't just be VW,if VW felt the need to ''cheat'' the tests I cannot believe other manufacturers aren't either.Another Q,whats the difference between petrol and diesel as far as emissions go?,is it only the NOx and particulate that causes grief with diesels?,I'm asking because how do American 6+ litre V8's pass when a 2.0ltr TD doesn't? Pat

Originally Posted by PAT303

This is a good point,it can't just be VW,if VW felt the need to ''cheat'' the tests I cannot believe other manufacturers aren't either.Another Q,whats the difference between petrol and diesel as far as emissions go?,is it only the NOx and particulate that causes grief with diesels?,I'm asking because how do American 6+ litre V8's pass when a 2.0ltr TD doesn't? Pat

The best collation of emissions standards is here:
https://www.dieselnet.com/standards/

Euro6 emissions standards have very little variation between petrol and diesel - a bit more NOx for diesel, a bit more CO for petrol.

California standards have no difference. That is why it is very hard for diesels to meet them.

Diesels are more efficient but produce more emissions (particularly NOx and CO). It is easier for petrol engines to meet the standards. Also, a 2L diesel at 2 bar boost (absolute) may as well be considered a 4L engine.

Some rules also allow a small number of high performance cars as long as you make enough small cars that run below emissions levels. That is why you see cars like the Abarth and hybrid lambo coming out...

Edit: Also the EU tests use a drive cycle that can best be described as granny out for a sunday drive. It is easy to get an engine to put out low emissions if it isn't putting out much power.

Originally Posted by isuzurover

The best collation of emissions standards is here:
https://www.dieselnet.com/standards/

Some rules also allow a small number of high performance cars as long as you make enough small cars that run below emissions levels. That is why you see cars like the Abarth and hybrid lambo coming out...

So the way to go for manufacturers is to produce LOTS of smaller cars (or buy out small car manufacturers) and then go to town producing W12, 600hp mega cars. As long as the total emissions is within an average, overall limit. The TOTAL amount of emissions is higher, but the average per car is lower.
So more cars = less emissions.

Originally Posted by Gerokent

So the way to go for manufacturers is to produce LOTS of smaller cars (or buy out small car manufacturers) and then go to town producing W12, 600hp mega cars. As long as the total emissions is within an average, overall limit. The TOTAL amount of emissions is higher, but the average per car is lower.
So more cars = less emissions.

Yep,thats about it,all made null and void by the millions of 2 stroke postie bikes smoking their way around the undeveloped world. Pat

Well we got a letter yesterday informing us of the progress of the fix, it's only a software update/reflash for the Amarok according to the letter, and they garrantee it will not have any effect on power and economy.

So we will see if that is true or not soon.

Originally Posted by Redback

Well we got a letter yesterday informing us of the progress of the fix, it's only a software update/reflash for the Amarok according to the letter, and they garrantee it will not have any effect on power and economy.

So we will see if that is true or not soon.

I haven't read this thread, but I expect this to be the case for just about all of them in Aus. They'll just get rid of the cheat software which I understood to be redundant in Aus anyway.

Thats how it's been reported,Oz vehicles never had it operate because they never needed it. Pat