Carbon build-up in DI engines

FlyByGTI · 07-29-2014, 02:20 PM

Quote:

Originally Posted by Mitco39

Thats not entirely true. I have seen the inside of diesel engines on farm trucks driven by old farmers with nothing out of the ordinary in terms of build up. I mean you always will have some but nothing to affect performance a noticeable amount or anything like that. Surely nothing like that picture. I suggest deleting the external EGR where ever possible, its just not a good setup. Most new cars just have a internal EGR by changing the cam degrees with respect to each other.

I bet if there was a way to turn this off on the Z you would see both fuel mileage and power gains from it. The Z does not have external EGR system on it, so it only leads me to believe it is controlled by the VVEL.

Hmm definitely an interesting idea. I wouldn't have initially thought of the EGR being controlled by the VVEL but that would make sense.

DLSTR · 07-29-2014, 03:26 PM

VW/Audi have addressed the build - up problem in the newest designs. That being said its not a game ending deal to have this problem. You figure maybe once in the life of the car you will have to clean. Most folks just dont keep them that long to begin with. I wont have my GTi until 100kmiles. If I do it would be a MIRACLE

FlyByGTI · 07-29-2014, 03:36 PM

Quote:

Originally Posted by DLSTR

VW/Audi have addressed the build - up problem in the newest designs. That being said its not a game ending deal to have this problem. You figure maybe once in the life of the car you will have to clean. Most folks just dont keep them that long to begin with. I wont have my GTi until 100kmiles. If I do it would be a MIRACLE

Yeah. A lot of people keep them forever or find something new. I know I had about 53k miles on mine before I sold it for the Z. Wound up doing a valve cleaning right around 48k but there wasn't anything I didn't dislike about the car. Just wanted something new.

Magic Bus · 07-30-2014, 05:05 PM

I have a 11 GTI which my wife now drives and probably have the worst driving scenario for it. Short city, stop & go trips as her job is only 4.2 miles away in the city. While no dyno to actually prove the loss in power, my butt tells me, the power has dropped since new.

The Z on the other hand.....no issues

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07-29-2014, 03:26 PM	#17 (permalink)
DLSTR A True Z Fanatic Join Date: May 2011 Location: Süd Germany Posts: 2,462 Drives: 21Supra 2.0/22 M240i Rep Power: 21267	VW/Audi have addressed the build - up problem in the newest designs. That being said its not a game ending deal to have this problem. You figure maybe once in the life of the car you will have to clean. Most folks just dont keep them that long to begin with. I wont have my GTi until 100kmiles. If I do it would be a MIRACLE

07-30-2014, 05:05 PM	#19 (permalink)
Magic Bus A True Z Fanatic Join Date: May 2012 Location: Honolulu Posts: 1,427 Drives: 17 6MT M2 Rep Power: 18754	I have a 11 GTI which my wife now drives and probably have the worst driving scenario for it. Short city, stop & go trips as her job is only 4.2 miles away in the city. While no dyno to actually prove the loss in power, my butt tells me, the power has dropped since new. The Z on the other hand.....no issues