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Nice write up. I've done some research as well on the Audi forms and it seems the RS4 and S5 owners with the V8 FSI recommend de-carbon every 50,000 miles. The last time I took my A4 to the Audi dealership for maintenance I asked the service advisor how much they charge for a decarb, I was quoted $500.

I only have 32,000 miles on the odometer so I think I'll wait until 50k miles to either do it in my garage or have it done at the Audi dealership.

I like direct injected motors but the downside is carbon buildup.
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Yeah, 50 000 seemed to be the magic number from what I found too. It's hard to say what effects the differences in the RS4 and basic 4.2 have on the carbon buildup. Hopefully some more people can post their findings when they have the cleaning done (yourself included) so we can possibly figure out the general trend with these particular engines. $500 sounds pretty reasonable, too (assuming you're talking about your Touareg and not the a4). I figure if I had to do it again, I could do the whole job in 6-8 hours. ~2-3 for manifold removal and reinstall, and the rest for cleaning. I'm sure there are better and faster methods of cleaning than what I did.
Have you read this thread?

http://www.clubtouareg.com/forums/f92/jhmotorsports-goodies-installed-4-2fsi-210073.html

There aren't many V8 FSI Touaregs out there. 2007's came out mid year and 2009 V8's were shipped here for VW corporate employees. That left 2008 and most were VR6 models with some V8's and a handful of V10 TDI's.

The RS4, like the R8 is a more high revving engine (redline 8,000 RPM) and since they are performance cars, I think their drivers tend to rev them more than a SUV. This leads me to believe that the Touareg may need to be decarbed more often than the Audi. But that's just my opinion.

The S5 B8 has the same basic motor as ours and JHM has a good write up about their S5 build, check it out. It includes pics of their decarb of the motor.

I'm just wondering if it is worth my time (8-10 hrs) to do it myself. The Audi service rep says they decarb lots of FSI motors. Since Audi makes the 4.2 V8 and my VW dealer sees very few V8's I figure they would be better off doing the work on my 2008 Touareg V8.
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Probably a dumb question but does using "TOP TIER" additized fuel play any role in helping reduce or slow down the rate of carbon buildup?
I've heard that the better quality gasoline you use the less chance for excessive carbon buildup that's why I fill up at Chevron..

Another good idea is BG 44k.

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I haven't seen it sold at auto parts stores but it is available at my local Audi dealership. The parts guy said its one additive that is not snake oil and that it actually reduces carbon buildup. It's also sold here at the BMW and Mercedes parts department as well. Go figure. I use it in my Touareg and Audi but I cannot confirm the results.
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Because not 100% of the gasoline is burned during the combustion process.

Poor quality fuel may leave unburned elements to stick on the valves and ports and BG 44k may help reduce this.

There is no proof that top tier fuel or additives reduce carbon buildup but if Audi recommends it, I figure I'd give it a try. There are also proven benefits to using top tier fuel and BG 44k for fuel the system and injectors.
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This one puts out too much product. My mechanic bought one like this and said it didn’t work. I used a cheap under $ 20. 00 one which definitely had it’s faults but worked pretty good. Bottom line is it’s a real PIA job. I first scraped everything I could off walls and valves and vacuumed scrapings out with 3/8” tube taped onto my shop vac, then used small media blaster with walnut shells for final clean. Since I did both our FSI’s, when you move that Touareg to Utah I’ll be here to give you a hand Perry 01 View attachment 204841 View attachment 204849 View attachment 204857 View attachment 204865 View attachment 204873
I like your final results. My Touareg will be there next February. I’d also like to replace the trans and diff fluid as well as de-carb the intake.
 

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Be happy to help with all of the above. Any progress on brake vacuum pump?
My extended warranty expires at the end of this year. I’m waiting for something else to pop up and include when I take it to the dealer to resolve the brake vacuum pump issue.
 
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