egr adjustment through vag-com

[rampage]

I was looking at the guide for vag-com, and it said that it should be possible to adjust (downwards) the rate of EGR. What's the difference between doing this and doing a 'EGR delete'? Is adjusting it through the controller almost just as good?

Please no comments about emissions, I live in Michigan and if they start emissions testing here the fact that my car pollutes will be the least of your worries because it will probably be the start of the next civil war. Beyond that, particulate matter conteracts the effects of greenhouse gasses, google 'global dimming'.

 

[Lex4TDI4Life]

Well, with a full race pipe/EGR delete you will have NO exhaust gasses passing through your intake at all. This should lead to virtually zero built up of schmutz in your intake. The EGR adaptation through VAG COM merely reduces the amount of exhaust gasses going through your intake.

Personally, I have my EGR turned down through VAG COM and am running an elephant hose from my CCV. I havent checked recently, but this should be sufficient to keep my intake clean.

 

[rampage]

Thanks... And nice avatar.

 

[Lex4TDI4Life]

There are a couple other downsides to a full EGR delete. One is that you lose your anti-shudder valve. This valve keeps your car from shuddering on shut down and may be of some assistance if your should ever have a runaway engine due to a turbo seal failure.

Another is that you will probably get a check engine light which can only be permanently removed through being chipped (RC, Alligator, etc).

 

[rampage]

Is there a thread that explains "elephant hose from CCV"?

 

[Lex4TDI4Life]

Do a search on it, or, even easier, look in the HOW TO thread at the top of the TDI 101 forum.

 

[rampage]

Thanks... there's tons of good info here but sometimes it helps to have someone point you in the right direction... I see there's multiple variations on the CCV mod.

 

[mgranic]

Do you have the details on what to set the value(s) for the EGR in VagCom?

Well, with a full race pipe/EGR delete you will have NO exhaust gasses passing through your intake at all. This should lead to virtually zero built up of schmutz in your intake. The EGR adaptation through VAG COM merely reduces the amount of exhaust gasses going through your intake.

Personally, I have my EGR turned down through VAG COM and am running an elephant hose from my CCV. I havent checked recently, but this should be sufficient to keep my intake clean.

 

[n1das]

Another is that you will probably get a check engine light which can only be permanently removed through being chipped (RC, Alligator, etc).

Doing the VAG-COM EGR adaptation mod (for off-road use only of course ) also appears to help lessen the possibility of triggering EGR-related codes.

The ECU determines if the EGR is working or not by looking for a corresponding drop in MAF numbers whenever EGR is requested. Doing the VAG-COM EGR adaptation mod causes the ECU to look for a smaller drop in the MAF numbers. The ECU can't tell if the EGR is there or not and the conditions it's looking for are always satisfied. This is not a guaranteed thing and YMMV but several TDIclubbers have noticed that doing the VAG-COM EGR adaptation mod appears to lessen the likelihood of triggering an EGR-related code.

Good luck.

 

[Honeydew]

Do you have the details on what to set the value(s) for the EGR in VagCom?

http://www.ross-tech.com/vag-com/cars/tdi.html

Some members including me noted a slight MPG and performance drop with the EGR turned down via vag-com. There are threads about it.

 

[TornadoRed]

The ECU determines if the EGR is working or not by looking for a corresponding drop in MAF numbers whenever EGR is requested. Doing the VAG-COM EGR adaptation mod causes the ECU to look for a smaller drop in the MAF numbers. The ECU can't tell if the EGR is there or not and the conditions it's looking for are always satisfied. This is not a guaranteed thing and YMMV but several TDIclubbers have noticed that doing the VAG-COM EGR adaptation mod appears to lessen the likelihood of triggering an EGR-related code.

This likelihood is even greater if you have an older TDI, like 2000 or older. So the OP may be able to disable the EGR completely after modifying the EGR duty cycle with VAG-COM.

Note: There is a right way to disable the EGR, but I have also heard that there's a wrong way. Do a search on "EGR" and "golf tee". This thread is a good place to start.
http://forums.tdiclub.com/showthread.php?p=1766265

 

[Chris03jetta]

I recently used vagcom to change my egr, and noticed a huge difference in power, for the plus!! The car has more power and at different rpm then it did before. I thought this was weird. e.g. before my car would be a little sluggish from 100 to 120 then would pull as it should but now the car pulls hard from 90 all the way up. Thats all i changed so the egr adaptation is what is causing the increase in power. I never expected this to happen and it doesn't make any sense but i'll take it.

 

[Krusshall]

Some members including me noted a slight MPG and performance drop with the EGR turned down via vag-com. There are threads about it.

Has anyone quantified the mileage drop after adapting the EGR? I want to maximize my mileage but also want to minimize intake gunking. I originally set the value to 33768 but then got scared about loss of mileage so I set the value so that the air intake volume is reading around 300 mg/stroke.

An interesting side effect of the EGR adaptation is that it significantly reduced (the 33768 setting essentially eliminated smoking) the amount of black smoke when the engine lugs. Anyone have any thoughts as to why?

 

[Chris03jetta]

I havent checked my mpg yet since this is the first tank, but would the adaptation turned all the way down affect the fuel mileage?

 

[TornadoRed]

Has anyone quantified the mileage drop after adapting the EGR? I want to maximize my mileage but also want to minimize intake gunking. I originally set the value to 33768 but then got scared about loss of mileage so I set the value so that the air intake volume is reading around 300 mg/stroke.

An interesting side effect of the EGR adaptation is that it significantly reduced (the 33768 setting essentially eliminated smoking) the amount of black smoke when the engine lugs. Anyone have any thoughts as to why?

I never saw any change in fuel mileage with the EGR adaptation, either better or worse. If there is any change, it is difficult to measure because other factors may be more significant. These would include changes in driving patterns, changes in ambient air temp and humidity, changes in fuel quality, and fluctuations in the level of each fill-up.

As for a reduction in smoke, this makes sense if the engine is combusting less recycled exhaust gases and more oxygen.