Worth it too if it means they ditch the EGR

 

Did they really? I doubt it. So one more system to service / break down etc.

sounds like 1 part p155 to several parts water.

 

Wouldnt 5 cups of coffee & a couple of litres of water when stopping at the motorway service station keep it topped up      .

 

Seriously glad i did not buy a Golf diesel instead of my Octy last time, extra cost that you really dont want.

Had Diesel for many years no more, next car petrol .

Did they really? I doubt it. So one more system to service / break down etc.

 

I also doubt it, but why do you need an EGR to reduce NOx when you're using Ad Blue?

Is it still the case that only the Superb in the Skoda range uses adblue?

Is it still the case that only the Superb in the Skoda range uses adblue?

I thought it wasn't AD blue, isn't it cerium based stuff to help the dpf work.

Sent from my Nexus 4 using Tapatalk

I thought it wasn't AD blue, isn't it cerium based stuff to help the dpf work.

Sent from my Nexus 4 using Tapatalk

No idea, the manual's in German

The superb is not ad blue.

It's dpf fluid as the dpf is well back from the engine.

AFAIK only VW in the VAG stable use adblue, and that the system used was codeveloped with Mercedes.

Have noticed a few adblue pumps appearing at filling stations, one or two of which are too small a forecourt for HGV's.

 

First time I came across the stuff was last year while on a rather long coach run through Finland and Norway; crew had drums of the stuff with them, as they couldn't guarantee getting it locally.

 

 

TP

The only pumps I've seen are HGV ones

The only pumps I've seen are HGV ones

 

Definitely seen them for smaller vehicles; BP site at Willerby on the A164 is a good example and its not suitable for HGV.

 

http://sewell-group.co.uk/services/retail/find-store/

 

 

TP

I also doubt it, but why do you need an EGR to reduce NOx when you're using Ad Blue?

 

Probably to reduce the amount of Ad Blue used, so that it is a service replaceable item and not a consumable item like petrol. Also to warm up engine faster, especially in winter.

Probably to reduce the amount of Ad Blue used, so that it is a service replaceable item and not a consumable item like petrol. Also to warm up engine faster, especially in winter.

 

I'd still rather be rid of the bloody thing and have to fill up at the petrol station every few tanks.

BMW X5's, X6's and 5GT's use it in the 3ltr and above engines.

More often than not, it isn't explained at handover so the 1st thing the customer knows about it is the warning, then the £120 bill for a refill. Ouch.

£120 to refill?

My word there is a lot of nonsense being speculated about in this thread!

Just be glad it's not a sodding Citroën!

My van ran out of the cerium based stuff awhile back, company paid for a refill (£120) and it was warning me again within 10 miles - apparently the pump has failed, still (10k miles later) waiting to see if they'll get it replaced.

I'm now driving a van that will fail its mot next year & waiting for the DPF to clog with soot because it won't regen.

Van is on 123k miles now so is well out of the warranty.

our whole fleet runs on the stuff and the boss's are going ape **** on how much they are using

 

ah well

Probably to reduce the amount of Ad Blue used, so that it is a service replaceable item and not a consumable item like petrol. Also to warm up engine faster, especially in winter.

You don't run both together, SCR using the adblue and an EGR system both do the same thing by different methods, to reduce the NOx output from the engine. SCR uses a catalyst in which the adblue is added to cause a chemical reaction to reduce the NOx level. EGR uses cooled recirculated exhaust gas in order to reduce combustion temperature which also reduces NOx output, you then have a DPF to reduce the soot level, which is regenerated occasionally by burning extra fuel in the engine to raise the temperature to burn off the excess soot.

Ian

I agree in theory, however the current VAG practice is rather different, including the new Passat.  In theory, you don't need to run both EGR and SCR together in an engine designed for SCR, ie with much higher combustion temps burning out the soot before it makes its way to exhaust. However, current VW engines are designed with EGR in mind, and SCR injection is only an afterthought/EU6 bodge.

 

Quick look at ETKA for the new Passat will convince you that it still has EGR and DPF, and an SCR system chucked in on top. Between the EGR/DPF and the SCR systems, it makes for a lot of possible failure points. The right thing to do would be to remove EGR, but I guess it is a significant redevelopment effort (compression ratio and air/fuel ratios would be different).

Edited 20 October, 201411 yr by dieselV6

I agree in theory, however the current VAG practice is rather different, including the new Passat.  In theory, you don't need to run both EGR and SCR together in an engine designed for SCR, ie with much higher combustion temps burning out the soot before it makes its way to exhaust. However, current VW engines are designed with EGR in mind, and SCR injection is only an afterthought/EU6 bodge.

 

Quick look at ETKA for the new Passat will convince you that it still has EGR and DPF, and an SCR system chucked in on top. Between the EGR/DPF and the SCR systems, it makes for a lot of possible failure points. The right thing to do would be to remove EGR, but I guess it is a significant redevelopment effort (compression ratio and air/fuel ratios would be different).

 

Yep, you have three systems fighting each other. And for that reason, I'm out. I've gone petrol only, they're getting pretty economical now.

https://www.youtube.com/watch?v=1h9hWlvg6sM

Does anyone know if the new EU6 150PS engines, along with the DPF, has ERG and SCR or just SCR?

So people are maybe now giving it more thought as they are looking to change their cars and want or need to run Diesels.

 

Which of the New Volkswagen Group cars late 2015/16 with bigger diesel engines and Euro 6 Emission Engines will be Ad Blue Systems,

is it all of them?