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Old 5th December 2019, 06:48 PM
NightOwl NightOwl is offline
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Default EGR and a couple of related questions

My 3.0 TDI has about 250K km and I have been considering deleting and/or blocking the EGR. Question is, should the EGR be deleted in the ECU or is it enough to just block it with a plate? And, if its being deleted, is it necessary to add the plate?

Next item to consider is the swirl flap housing. I guess it's just a matter of time before they give error messages. Or they have actually, but it hasn't returned. I've seen pictures of the housing and I'm pretty sure mine is no better, so I've been thinking to buy new ones as I don't plan on spending hours to clean out all of the carbon build-up. Any thoughts?

The engine has a so called stage 2 tune, means it should have close 300 bhp. Would the carbon build-up in the plastic intake duct over the engine restrict the airflow in a way that it should have been cleaned out or replaced as well? As far as I know, the MAP sensor is located at one of the inter coolers, so any loss in pressure after could lead to loss in power?
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2006 Audi A8 3.0 TDI Quattro Sport
A8 W12/S8 Brakes front and rear (385mm/335mm)
Focal and JBL speakers, Helix amps
S8 anti-roll bars front and rear
Complete rear LED taillight
Xenon fog lights
All interior LED
S8 rims 9x20"
Stage II tune
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Old 5th December 2019, 11:46 PM
snapdragon snapdragon is offline
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Pulling off the vacuum pipe and putting a ballbearing or a snipped off artist's brush handle has the same effect as an EGR plate - it just stays closed. You will get an EGR - Insufficient flow error code and light though. It will need to be turned off in software. Note this will make the engine sound more dieselly.

Flaps, they server a purpose so may as well wait until they fail. I cleaned my whole post EGR intake out at around your mileage, the ports to the inlet valves in the head were almost completely bunged up in sooty sticky coke, I scraped it off in lumps. Expected a noticeable increase in performance afterwards but there was none I could perceive.
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Old 6th December 2019, 07:13 AM
NightOwl NightOwl is offline
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So what you are saying is that I should delete the EGR in software only and don't care about the swirl flaps before they fail completely. Also cleaning out the intake duct and swirl flap housing is a waste of time?

Reason I'm asking is that I did an acceleration test with VCDS connected after the tune, and 0-100 km/h was slower than stock factory data by 0.4 seconds...
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2006 Audi A8 3.0 TDI Quattro Sport
A8 W12/S8 Brakes front and rear (385mm/335mm)
Focal and JBL speakers, Helix amps
S8 anti-roll bars front and rear
Complete rear LED taillight
Xenon fog lights
All interior LED
S8 rims 9x20"
Stage II tune
S8 Grill
Reply With Quote
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