Doing some work to my 2012 4.4 TDV8, engine out to change the washer bottle and make the CD changer quieter. Usual stuff.

One thing that is puzzling me after talking to Daveturbo who runs two L322s, sensible chap.

The exhaust only has a Cat on the drivers side/ Bank 1 . Anyone got a clue why that is? I presume the other side has the EGR but why isn't there a Cat on both sides or aft of the manifold join.

What am I missing?

Click image to enlarge

They are such a complicated setup .DOH. Cant wait to get mine running properly, was great to chat last night. Mercedes AMG w207
E class Cabriolet
Overfinch L322 4.4 tdv8
1987 sierra rs cosworth 3 door white.
1985 escort rs turbo series one.
1992 sierra sapphire 4x4 cosworth red
1993 sierra sapphire cosworth 4x4 silver
1993 sierra sapphire cosworth 4x4 white
1995 ducati 916sp.

Range Rover L322 wrote:

Doing some work to my 2012 4.4 TDV8, engine out to change the washer bottle and make the CD changer quieter. Usual stuff.

Range Rover L322 wrote:

The exhaust only has a Cat on the drivers side/ Bank 1 . Anyone got a clue why that is?

Yes I found the answer - from an Land Rover Chief Technician.

Very broadly:

the sequential turbos mean that at low revs / low heat with high emissions most of the crap comes out of the right hand side. Then when the turbos are spun up the higher temperature burns off the crap sufficiently on the left that it stays within emissions tolerances.

There is some additional magic and wizardry in the gas flows also linked to the EGR which I don't fully understand.

Separately a few of us are researching why EGR delete doesn't work on a 4.4. - I think this is linked.



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