One of these engines is currently for sale in Ontario, Canada. Price $10,000. Just check Kijiji. Ad 1035926596.
Ad says it’s out of a 2007 S6. If anyone out there has a C6 and wants to drop a V10 in it, this is your chance! lol
Thanks for the tip. That one has been up awhile.
I wouldnt pay more than a couple grand CAD for a used v10 engine. There is one guy in the US right now who has a perfectly running used one for $3k. Still, I wouldnt count on it being anything better than a good core.
The v10 short blocks I referenced are Audi reman or new. That is a huge difference compared to a used engine. Even the Audi reman should be like getting a new engine. So, if you just wanted something stock, then that is probably your best bet.
Next option is getting a good core and then having JHM do the rebuild. You are probably looking at about $20k USD, but you are getting something that is redesigned and bulletproof. If I ever have a problem with my engine, this is what Ill be doing.
With any of the used engines, you have a big chance of getting something that has problems. That is why I wouldnt pay much at all for them. Only good if you have a car with a blown engine, and want to swap in a used one so you can just sell the car. Then maybe you dont care about having something solid, and the risk of getting a bad engine is worth it for the price.
Good point. Audi refurb is basically brand new.
Can anyone confirm whether the Avant (wagon) V10 is in North America? That’s interesting trivia to add to this thread for the wagon fans. I personally love the Audi boats.
Nope. Only engines in the C6 Avant in North America are the 3.2 and the 3.0t, with the later being the obvious choice for any AudiRevolution member
I have the “01L” transmission (five speed auto) in my C5 S6 Avant. Gonna need a rebuild before the project is done. And I agree manuals are totally overrated. I prefer manual, but the Tiptronic shifts faster than a human being. Giving up the manual won’t be as hard as giving up smoking, but I think it’s a habit that most of us will have to change.
I’m not sure who will be doing my transmission yet. Maybe I can get it done in Detroit at the same time as the engine rebuild.
Where is 517 Transmission located?
When it comes to a performance transmission rebuild, I am in the situation where I dont know who to trust.
Sam at 517 seemed to be knowledgeable when I talked to him on the phone, but then there was this…
http://www.audizine.com/forum/showthread.php/576924-BUYER-BEWARE-SAM-at-517Trans
If you need the transmission rebuilt, I would not go to any shop directly. You are a one time customer to them, no matter how much you tell them that youll spread the good word and your car will be featured on forums, etc., etc.
What I would recommend is that you talk to CV or JHM, and let them arrange the deal with the transmission shop. OR, get a transmission rebuild kit that is approved by them, and have them do the work, or let them find someone who can.
The more I know about modding Audi’s, the less people in the industry that I trust to do any work on them. So, in my case, I only feel comfortable giving my mod money to those listed above, and the people that they approve.
That is just my opinion anyway.
Good call. Great thread. Best to leave a transmission rebuild in the hands of repeat customers.
Now that you mention it, I remember a similar conversation from when I bought the S6 boat. Excellent perspective.
Transmission stuff definitely ask CV. We had a few local guys that were very sharp with these transmissions. The 5 speeds are not to hard rebuilds. It’s just about getting the right parts.
Maybe v8a6 let clochner now about some of the more off topic posts. He can split the thread here to keep the technical stuff and keep some of the S6 chatter talk into its own thread. Keep things more technical
wonder if we’ll see 400 whp and/or 115 mph all motor out of one of these…
If that comes to fruition, I expect a 2010-2011 S6 in my future.
Good idea. Ive been super busy as of late, but I agree, this dump needs a cleanup. If I ever have some free time, Ill go through and make a list for clochner of all the stuff I think should be moved
Given the excitement. I would be down to get a big body car like this too
hey man… you are talkin about the S6 like she’s a plus size model LOL
^^ Fixed
For sure, man. Just let me know. Would be happy to help. This is obviously one of our up and coming platforms on AR. Great to see it growing.
I am hoping we may be able to get close. 400 awhp would definitely be a nice number, but I would say anything above 375awhp would be impressive.
400 awhp
There is a guy on Audiworld who did quite a few dyno runs from stock, to modded, to carbon cleaned plus mods. If there are any dynos that make sense to me from a v10 S6 (i.e. look accurate), it is probably his.
stock (pre carbon clean - where most stock cars probably are at before they get heatsoaked and start pulling timing)
288 awhp
289 awtq
APR tune/miltech catback/msds filters (pre carbon clean)
313 awhp
320 awtq
http://forums.audiworld.com/picture.php?albumid=161501&pictureid=222395
http://www.audiworld.com/forums/a6-s6-c6-platform-discussion-58/apr-tuning-c6-s6-review-2775392/
APR tune/miltech catback/msds filters (post carbon clean)
342 awhp
338 awtq
http://forums.audiworld.com/picture.php?albumid=161501&pictureid=227808
So, if we estimate drivetrain loss at about 27%, then that puts the power at some around
470 chp
460 ctq
These are just estimates. But if you guess that the S6 is at 450hp with an S8 stock tune (same engines, with the S6 detuned from the factory), then getting up to 470 chp with an APR tune, catback, carbon clean, and filters seems reasonable to me. That is if Audi is telling us the truth regarding the S6/S8 chp
Back to the 400 awhp goal… we would need to somehow get another 60 awhp (about 80 chp) more to reach 400 awhp, if the data is solid.
So, remove the cats, do headers, 3-inch catback, a JHM tune, lightweight wheels and rotors, intake path modifactions, intake spacers, 94 octane tune, etc. I think it is possible. However, there is no guarantee, and it wouldnt be easy for sure.
And, this is only if we believe his dyno numbers. You never know what the place selling the tune has done to make it look great on the dyno. That is why everyone around here only puts so much faith in the dyno.
If we could get 400 awhp out of one of these, with a 27% DTL, you are looking at about 550chp. That would be crazy. And what I think would be even better is the low end torque. It would be such an awesome street machine.
115 mph trap
I think the trap speed is going to give a much better indication of the power of these cars than the 1/4 mile time. The new Audis with launch control are going to get off the line WAY quicker. But once rolling, I think a properly modded v10 S6 is going to pull pretty hard.
I’m not track expert, so I could only compare to know results on similar cars.
APR measures the C7 S6 4.0 TFSI stock with 93 octane:
12.216 sec
112.42 MPH
APR stage 1 C7 S6 4.0 TFSI
11.628 sec
117.83 MPH
So, if we can achieve a 115 mph trap, I would say that would be pretty impressive. From a roll, you are beating the newer S6s and S7s. And a stage 1 APR S6 is likely going to be a bit faster on boost. But, there will be absolutely no lag at all with the v10 NA engine. So, if you catch any of the turbo cars off boost, you might get a nice little jump on them. Of course, this is all speculation at this point. A 115 mph trap on these cars would be an amazing achievement, so we’ll just have to see how things go.
Saki, I know you are the expert at track calculations and extrapolations. If we can get one of these cars to 400 awhp, what do you think our trap would be on a 4300 pound car plus driver?
BTW, if anyone can get an actual weight for one of these cars, that would be amazing. I have seen anywhere from 4200 to 4400 pounds. We need to get one on an actual scale. As stock as possible would be great.
If you look at the dynos, they are pretty much flat on the HP after 6100rpm, or so.
Does that mean there is a bottleneck somewhere? This chart is a rough guide for max HP for exhaust systems
http://www.ls1gto.com/forums/attachment.php?attachmentid=149219&stc=1&d=1332948156
And the following thread from Justincredible is a MUST READ for anyone considering an aftermarket exhaust of the Audi NA v8 or v10
http://audirevolution.net/forum/index.php?topic=3080.0
Stock S6 dual 2.25 = 371hp
Milltech catback for the S6 2.36 (not listed in the chart) = somewhere around 400-420hp
The max HP rating in the chart is not a hard stop. It is a recommended diameter for an average modded car, where the exhaust starts to become a restriction.
This could account for bottleneck, or a decrease in efficiency at least.
Could the stock cats be the bottle neck? How much timing is being pulled due to their role in heatsoak? They definitely are not of the most efficient design, as we have already talked about at length.
There are a couple interesting things to note about the dynos
- Max torque is pretty close to Max HP
This is something you see on a lot of modded Audis. On my old C5 A6 4.2 (which more or less had an D2 S8 engine) the max torque exceeded the max HP when all was done (278 awhp and 296 awtq). Kind of interesting when Audi reports the stock D2 S8 torque as 317 lb-ft and 355 hp.
Now, I had extensive modifications, an awesome tune, and a 6speed swap. So, it is not a direct comparison at all. But having the max torque exceed the hp was not something that I had expected.
Some Audis have torque limiters built into the tune for the lower gears and rpm (e.g. B7 RS4), that can be deleted with a tune. However, I dont think that is what we are seeing here. Even the stock dyno has a consistent curve when compared to the APR (pre carbon clean) one. Either Audi is understating their torque on the stock cars (maybe because they do limit it in lower gears? Dyno is likely in third) or they are overstating their HP.
- HP flatlines at about 6200 rpm
Obviously the dyno guy sees it flatlining too, because on the last dyno he stops at about 6100rpm, I am assuming because the car reached the point where it wasnt making anymore HP
Audi states the following for the v10 S6
Power (SAE): 435 hp @ 6,800 rpm; 398 ft lb of torque @ 3,000 rpm
So, they believe that the car should keep gaining up until pretty much redline.
If the car wasnt bottlenecked at higher rpm, and the HP curve keep on the same line, then the car could have possibly picked up another 15-20hp at the wheels by 6800. Just speculation, but something is definitely holding it back up top.
- What is the real max torque and how can we measure it on a dyno on a car with a tiptronic trans?
Going back to Audi, they state that max torque is at 3000 rpm. Well, it is hard to dyno a tip trans Audi in third at 3000 rpm. On the dynos, you can see them rolling into it at about 3700rpm on the best one.
With the S4 JHM header cars, they had about 50 lb-ft more torque at the wheels (IIRC) and it came on about 1000rpm sooner. If we see a similar gain on the v10 (v10 FSI should see 25% or more gain over S4 v8) then we would be looking at somewhere around 60 lb ft tq gain at 2000-2500rpm. If you go WOT at 2000 RPM in any gear but 1st, then the car is going to immediately down shift (probably a couple gears)
Maybe the best way to get a measurement on the dyno would be to have a custom “dyno” tune for the car that holds third. I dont know if this is possible or not though.
So, why does max tq at 2000-2500rpm matter, if we can only get there for a split second in first at WOT? In a 1/4 mile run, the car will shift at about 4500rpm or higher after 1st
https://www.youtube.com/watch?v=vBQf6RnWpGE
Huge torque at low RPM equals smooth, effortless, instant response power at part throttle, without the car downshifting. In other words, the perfect street car. And in first gear, neck breaking pull if you slam the pedal to the metal from low RPM. I think that the 1/4 mile, trap speed, dyno, etc, are only tell part of the picture of the v10 S6. To get the full experience, I think a drive of the car would be necessary. I think the car is going to feel even faster than what the numbers show, especially when you hear that v10 exhaust wail under increased load 
It’s going to take some real work to find the true bottleneck at each level. I think your going about it the right way. It will be interesting to see how your car turns out.
Agreed 100%
I just did a rough count and there are at least 10 different physical components that could account for some or all of the bottleneck to reach 400+ awhp, and I am probably missing some. Good thing there are a group of guys much smarter than me working on the project 
What is the S8 exhaust diameter like?
And the V10 GALLAR8O