EGR OFF EDC16CP34 Audi 2.7

Post #1

Sava

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Hi guys,

I am trying to do an EGR OFF on a EDC16CP34 Audi 2.7 and i saw online that one the simpler methods to do it is by zeroing the hysteresis maps, if the egr valve is functional.
In my case everything works properly except a clogged cooler. I also have a healthy DPF and want to keep it that way.

I think I've found the maps at the following addresses:
• 1C66D6 "Bosch 16" (8x1)
• 1C66F8 "Bosch 16" (8x1)
• 1C673C "Bosch 16" (8x1)
• 18B0E6 "Bosch 16" (8x1)
• 18B108 "Bosch 16" (8x1)
• 18B14C "Bosch 16" (8x1)

But I am not sure which of them or how many of them should I modify: 2, 3, 4 or all of them.
On another forum I got an edited file from an helpful user. In his version, only one map is zeroed out, along with changes to other addresses that I don't fully understand. It may very well be a viable solution but because i didn't got to explain there my need to have the DPF still regenerating and also to keep the valve connected, I am not sure if he took that into consideration.
I have attached here both files.
It would be very helpful if someone could give me a good piece of advice.
Thanks!
 

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Post #2

I don't think it is good idea to remove egr and keep dpf. as egr is also working on dpf regeneration.. So if by remove egr you mean totally close it - remove dpf too. Just my suggestion. Im not pro tuner. but I have a lot experience in this theme. We do eur3 downgrade on almost all cars around my country, and we seen a lot of variance (paid pro solutions + free solutions)
 

Post #3

That is a valid point, thanks for your reply and suggestion. I'm trying to tinker with the ECU as little as a can, and turning the EGR off via hysteresis seems the simplest way to do it. I don't need or want to remove the DPF or cancel error codes.

There are documented cases of users who have managed to deactivate the EGR and still keep a fully functional DPF. In fact, on other specialized forums, there are entire threads dedicated to the relationship between EGR Off and DPF regeneration. My conclusion from researching them is that the DPF can absolutely stay active as long as the EGR is deactivated the right way.

That is exactly what I am trying to achieve here. I just need to identify the right hysteresis maps because, if I understand the logic correctly, some of them are responsible for special operating conditions, including the DPF regeneration cycles themselves
 

Post #4

I went on and zeroed out the first and third maps on both blocks. The EGR valve is shut without any DTCs and the DPF is regenerating normally. I am very satisfied with the results.
 
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