The published BHP is 444 (450PS). Check your intake flaps. There's no comparison between the V10 and earlier D2 V8 S8. The V10 is much quicker. I've had both a D2 and still enjoying a D3 V10 after 7 years in my ownership. Hope you update this great post
I am sure the shop mentioned this but dyno dynamics are typically known for lower power readings but it all depends on their correction factors. What you realistically would need to know from them is how much a new bone stock car made. Obviously hard to know now, but if they reg tune audis have them look at their history. Your power may not actually be that much less now, but the graph def looks a bit odd. Great video though and love the before and after analysis!
You need to look much further into this. Healthy V10 S8's are putting 365-370hp to wheels normally. How many miles has the car done and have the spark plugs, air and fuel filters been replaced. Sounds like its got a deeper problem to be losing around 70 ish horsepower. Hope you have some luck with it. Mines has just under 80k miles on the clock and runs like a champ. Regular servicing and good fuel is the key.
The intake on these sedans are essential a ram air set up, Because of this, You'll always make less power on a dyno than when driven. You can follow the air ducting to the just behind the front grille.
Carbon cleaning definitely works.For £90 it made my 140k BMW e45 325i Sport manual with 140k run like brand new! It's now running 207 BHP and 265NM :-)
Target hp should be around 340-350. Recommend doing a few oil changes with some seafoam at 1000 mile intervals, a seafoam intake cleaning, spark plugs , MAF clean and air filters.
any new results?? this is crazy, when i first read about this car I thought it would be so cool to mod one! my 5.7 engine is making 405 at wheels. the right tuner should be able to get these v10's going
Man I was hoping after paying the $1400 you would get like a 100 horsepower increase. At least more than 29hp. That is one beautiful Audi though! I hope you provide additional vids in the future. God bless!
Depends on oil quality, history of regular oilchanges, quality of oil in rear diff, gearbox Ravenol oil, spark plugs replacement every 50k miles, fuel filter replaced every 20k miles, octane levels of fuel, tyre pressures
I agree, maybe the engine has wear and have low compression. With all that money spent in "skilled" labors they should have noticed any manifold flap failure
how reliable has the car been overall, most expensive repairs and recommended things to look out for when purchasing a used with 100k miles on it? what performance mods have you done?
$1400 for a carbon clean bruh i did it for $50 with new gaskets, carb cleaner and a drill with tip ties in it and it came out cleaner than those pictures
Hi Chris. I realise I am late to this conversation but did you find a root cause? I've got an 09 v6 - 3Litre supercharged making 260hp on the wheels. I believe you should be getting more like 370-380 hp on the wheels with the V10. Firstly how many miles on the engine? Secondly a full Audi engine diagnostic sounds like it is well worthwhile? If it's any consolation, once you've got the engine low output sorted, the benefit of the inlet port clean will be more pronounced :)
I don't know if you have checked out JHM they have a bunch of perfornance options now available as well as Audirevolution.net seem to have a good handle on how to get hese cars some power even down into the 12 second mark on the drag strip.
Remove and inspect the intake manifold as told before. Also there are vales at the back of the air cleaner houses. Check if they open when the engine needs more air.
That's the wackiest dyno chart I've ever seen, might want to look into why the power delivery is so inconsistent. I have owned three vehicles and I've had them all on the dyno, none of my vehicles had much power loss- usually about 20-40 less hp then what it has at the crank. Even with the carb cleanout your V10 Audi should put out more power then my 2006 Mustang GT used to, it put out 260hp and mid 280 torque to the wheels with only a 4.6 V8.
This is Audi S8 with V10 engine is not the car that suppose to show results, because this is very powerful engine, which burn the fuel at higher temperature, so there will be not that much significant deposits of carbon! Maybe there is some regular engines to show results! By specs of here: www.edmunds.com/audi/s8/2009/features-specs/ This vehicle is 450 h.p. , so I wonder how it lost more than 150 h.p. just before measuring/carbon cleaning??? Then it got some H.p. more , which is also not the real, because if this engine lose 150 h.p. it will be not working totally... Also, I really wonder how you guys always showing the intake valves??? There is no burning process in the intake valves, so how do you think they will be cleaned by oxy-hydrogen, because oxy-hydrogen is cleaning where is burning process during operation! You better think when you trying to show results of this cleaning, because this video is bad made scenario for results! Same as Chinese with white cloth behind the car is measuring carbon soot! There is many other ways to check what you have done about removing carbon deposits... See this example: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-MIUf8o-_B6Q.html
Any lead on this power loss issue my 07 S8 is feeling like less power and I had carbon cleaning done a year ago with a new intake manifold die to broken arm on it.
Let me help explain. VW is Audi. VW got busted lying about mpgs, the A8 4.2 I have has a recall for emissions because they lied about that too. They are liar's. I had the carbon issue on my 4.2. I've owned a lot of cars and trucks over the years. I have never regreted one as much as my Audi. BY FAR the biggest overpriced piece of unreliable value losing junk I've ever owned. Nothing but issues. Go to the forums. Chock full of common known issues and very expensive to repair anything of course. It's a beautiful car but after that. It is designed to fail on every engineering level in it if it's over 5 yrs old. Planned obsolescence is the business model first and foremost for Audi Corp If you are here thinking of buying a used one run. There is a reason they drop 70% of their value in the first 5years and that's after costing $100k.
There are flaps inside the intake manifold that open and close to redirect air through different chambers for low end torque and higher rpm hp. One of the flaps may be froze or like on mine the arm from one of the motors to the flap had come off. Hope this helps since there is not much technical info on these cars online
Some oil leaks may require engine out which is 40hrs of labor also some hoses require engine out to be replaced,air struts are 700-1700$ per corner,air compressor is 1200$,intake manifold 2500$ plus labor,depends how lucky you are and what previous owner did to it.I want one too.
Also have a look on the wind shield and you can notice that the stickers are different. 1st car - one white sticker in the mid and one in the right; 2nd car - two stickers in the mid !
Check that you airboxes open at high rpm. There are flaps in the box the air filters live. Mine had broken tubes and they wouldnt open, causing a massive drop in intake pressure (too much restriction)
Possible fuel pump or fuel filter issues. Or coil packs. Seems the fuel or spark is having a hard time keeping up with the rpms. Or the valve variable timing is not working correctly. Whats the fuel mixture graph look like?
I would recommend replacing spark plugs and air filters, if you haven’t. Use oem plugs only. If your flaps are getting stuck it would give a check engine light, so I don’t think it’s the flaps.
elxso18 first paragraph last sentence i61.tinypic.com/m81ob7.jpg the reason is pretty simple. There's nothing to detect airflow after the MAF it does all of the measurements before the flaps. So having telemetry on manifold flap position is useless. It already has info on how much air is going into the manifold.
Tyre pressures, RON of fuel should be 98 or 99, quality and condition of wheel bearings, diff oil replacement recently? Brake calipers binding? Compression test carried out on all cylinders? Spark (iridium) plugs every 50k miles are really important.
Not a common fuel rail (run of the mill thickness you'll find in port injected vehicles) it's far thicker and larger but GDI is a common rail multi point injection, it's just direct injection
The fan can't produce a 155mph wind the V10 generates a lot of heat very fast. to dyno these cars the best thing is crank the heater all the way up and place a second fan and or remove the front bumper . then the ecu wont intervene and change the ignition moment all together . even then you'll have a very small window to measure the power . And then there are things like the condition of the coolant it self ,the radiators are they clean ? sometimes they are a little chocked by debris building up over the years . Air filters are they clean, the condition of the Spark plugs make a huge difference with this engine . people underestimate the effect of older spark plugs with high performance engines. and last the type of fuel is it running premium fuel ?
That’s weird my car a 2010 was keeping up with my cousins scat pack and that was before I had it done the carbon cleaning and did some mods to the engine
I live in Woodbridge Virginia. Good luck with the car shopping. Definitely contact an Audi service center with the VIN to see what maintenance has been done.
For sure. Specifically I'm shopping between the S8 and the S6. I haven't quite settled on which I really want yet. If I can independently update the head unit (starting to get a bit dated) for the infotainment system in some sensible manner on either one, it may get the edge. It's either these cars, a 535xi wagon, or an A6 TDI at the top of my shopping list. I have some hard choices to make haha.
Please don't get the 535xi wagon, or ANY wagon for that matter. lol Get the S8 or S6! Whichever one presents the best deal, bang for your buck etc. I LOVE Audi. God bless!
Jarrett Paige I don't know man, it's like that hatchback Ferrari. If you can afford a Ferrari, why the heck would you get that hatchback/wagon lookin thing. lol It's actually starting to grow on me though. It's just 'different'. That's for sure.
Here is a valuable tip: SELL IT! Audi's are getting cheaper in quality every day. Sexy cars but they drop in value like a cinderblock off a roof top. This is because they are NOT designed to last and are very expensive to get parts for and repair. I owned a 2.7T a6 back in the day. I drove it for 10years and it had so many gremlins, today's audi's have more.
Haha I just bought mine for $500!! Seller was going thru a divorce and she didn't have a place to park it at her new apartment. It needed tires, alignment, inner tie rod, battery, spark plugs, and a intake cleaning. Should I flip it? It's fun to drive
The 5.2 V10 engine used in the Audi S8 and S6 (2006 was the release of the new V10 in S6/S8) models is NOT the engine found in the Gallardo or Audi R8. The first generation Gallardo (2003-2008 model years) used the 5.0 V10, an engine that is entirely Lamborghini-designed and Italian-made. The Audi V10 in the S8 and S6 (5.2) is actually based on the newer Audi 4.2 V8 design which used timing chains found in the back of the engine, all they did was add two cylinders. Though Audi had owned Lamborghini since 1998, they did not reach out to Lamborghini for the V10 in said S8 and S6. When Lamborghini needed a new V10 to put in the newer 2nd generation Gallardo and Audi was looking to put a more powerful engine in the Audi R8 (this was around 2008), they decided to codevelop the V10 for these two cars. Audi essentially told Lamborghini that they already had a V10 made a couple of years ago but it wasn't powerful enough and didn't have the high RPMs of a supercar engine. What they decided to do was pretty much scrap the whole engine but kept the majority of the engine block of the S8/S6 V10 the same. But they completely overhauled the rest of the engine resulting in 552hp @ 8,000rpm and 398ftlbs of torque @ 6,500rpm. So no it is not derived from the Lamborghini nor is it a Lamborghini engine but you can say you have 20% of one😉.
Tell me where I can read about the history of the creation of the 5.0 V10 Lamborghini engine? Looking at this engine, I see that the timing chains are also located behind the engine. I also see that the piston stroke of the 5.2 engine is exactly the same as that of the 5.0. And what is characteristic is that it has a long-stroke design. Which is not typical for Lamborghini engines and any Italian supercars. But just typical for VAG engines
@@vana6666 5.0 is the Lamborghini engine, I posted this comment a while ago but Wikipedia has a lot of information on these engines. There are 3 different 5.2 v10 engines from VAG
