Diverter valve and intercooler upgrade questions.

[LaserSVT]

Yes, more noobish questions that I am sure have been asked a million times. I dont know what i am doing wrong in our search function but even if I just type "Intercooler" and tell it search titles only it says "No matches"

Meh, so here it is. The Wagner intercoolers look very nice but do they make a noticeable difference in IATs that would allow for a nice bump in turbo pressure? Due to the larger size is there any increase in turbo lag? Are there better intercoolers? Are there ones that allow you to retain the factory fog lights, the ricer in me likes them.

For the diverter valves, my past turbo Audis always had issues with them and I was surprised to see OEM ones on my car.... at least I think they are OEM. I have seen a couple diverter valves that allow a little boost to go to the atmosphere to get that blow off valve sound. Again, the ricer in me likes that. Not the super loud kind but just a little "pshhh" is nice. I know the Turbo XS are supposed to be junk but are there any good ones that wont cost a couple fingers? Also even though its only a little atmosphere vent will it effect the cars computer at all? Like stumble or idle funny because the air it measured wasn't fully returned?

Thank you gents that actually answer these questions I am sure you are sick of.

I am a fast learner though and usually a few months after owning a different kinda car I can become quite the knowledge base on it because I am so passionate about it.

[DHall1]

It may serve you to try water/meth injection to deal with IAT control.

I have always run stock diverters with no issues. Ymmv

[LaserSVT]

I guess first things first and I need to log or even see what the IATs actually are. I cant wait for FIS to get that dang module back in stock so I can read all that in real time.

[RS Sick]

The Wagner intercoolers look very nice but do they make a noticeable difference in IATs that would allow for a nice bump in turbo pressure? Due to the larger size is there any increase in turbo lag? Are there better intercoolers? Are there ones that allow you to retain the factory fog lights, the ricer in me likes them.

For the diverter valves, my past turbo Audis always had issues with them and I was surprised to see OEM ones on my car.... at least I think they are OEM. I have seen a couple diverter valves that allow a little boost to go to the atmosphere to get that blow off valve sound.

My experience with intercoolers: from what i've seen, all stockers leak to some extent, starting with passenger side. Before i bought vagcom I attempted to seal stockers with JB weld but didn't pressure test before refitting, so i probably didn't get all the leaks. Once I got vagcom the stockers would only hold 1650 mbar to redline where now I can hold ~1750. Never measured IATs before, but I could for a sample now that they're on. If someone has repaired stockers they can measure IAT and if the ambients are close we should have a good comparison.

Check that 115 log from yesterday, i hit "full" requested by 3400 rolling into throttle in 3rd so it doesn't feel laggy, but again without stock for comparison not sure how far off it is. IMO, they're worth piece of mind knowing they're not leaking. I purchased full kit (ICs, silicon hoses, CF shrouds, and even new Norma clamps if you want to use them) from Horsepower freaks aka vivid racing for $1,450 using 3% off promo code. I kept factory fog lights by reusing stock plastic mesh guard.

[DHall1]

I hold 1750 with stock ic

[RS Sick]

I hold 1750 with stock ic

did you have to repair them? All stockers in your collection hold 1750?

[DHall1]

Stock ic never touched
90 deg heat
I just made a run

[lswing]

Here is a chart for the Wagner's. I noticed a slight bit of lag compared to stock IC's due to the extra volume, slight though. Cooling effect seems good. Apikol and a few other companies can build similar IC's using stock end tanks for a reduced price.

http://audirssix.com/images/rs6-wagners.jpg?lbisphpreq=1

Stock dyno graph from the manual, see how HP takes over as torque (and usually boost) tapers off. Stays similar when tuned, just more of both. I'll try and dig up a sheet from my dyno runs.

http://audirssix.com/images/engineTech.jpg?lbisphpreq=1

[lswing]

did you have to repair them? All stockers in your collection hold 1750?

My ~10 second run was on stock IC's, they were tested and confirmed to not be leaking. Small leaks can be patched up with JB Weld or other methods. Not all stock IC's leak, but many do. You can achieve a lot with them actually, but more cooling and assurance that you won't get a leak is worth the upgrade.

Edit; Boost was around ~2,000 mBar. Upgraded IC hose system from Venair, pressure tested, no leaks anywhere...makes a huge difference, zero leaks that is.

[lswing]

Stock ic never touched
90 deg heat
I just made a run

How is the gas quality down there? :hey:

Pretty sure on my ~10 second run I had the speed juice in my tank also, usually would add some to boost octane before I put the W/M kit on. Guessing you're dumping in the Aces IV with your crap gas and hot weather.

[DHall1]

Gas sucks

I run Costco w/aces

I need w/m

I hate to say this but the Wagner ic temp graph is a complete sack of warm $ hit. The stock ic temps do not react in such a manner at all. Not even close. Somebody is getting creative with the crayolas again. I hate it when companies do that.

[LaserSVT]

I thought these cars only did 11s at best?

[lswing]

I thought these cars only did 11s at best?

Just 0-100, no distance involved.

[lswing]

Gas sucks

I run Costco w/aces

I need w/m

I hate to say this but the Wagner ic temp graph is a complete sack of warm $ hit. The stock ic temps do not react in such a manner at all. Not even close. Somebody is getting creative with the crayolas again. I hate it when companies do that.

Yes

Yes

Yes

I would agree, chart seems a bit exaggerated.

[LaserSVT]

So if I understand this right there is probably a 90% chance I have a boost leak with stock ICs? I would suppose that my IC couplers that have clamps on them that are literally ground in half probably cant hold in all that pressure? <- BTW that is me and sarcasm. The night before the truck came to take my car in for the recall I was attempting to adjust my coilovers (didnt have the wrench so there was more goodness to order) to raise it up to make it easier for the tow truck to not destroy my bumper I had noticed on both sides that the IC hose clamps were ground down to as little as 1/8" wide in a couple spots.
Time to find another belly pan! Also why I decided now that the wrenches are here that the car is going to get nearly an inch added to the front. LOL

Anyway, I digress. So these cars have boost leak issues. Good to know. Helps me justify paying $1500 for some intercoolers and some hose couplers. Oh snap! I just remembered I bought some really expensive T-clamps couplers like 5 years ago for a project that fell through. Been starring at those $14 each (for a freakin hose clamp!) things on my shelf for 5 years now.

RS Sick! Thanks for the info once again. All you guys are really great at knowing where the deals are! I thought that intercooler set was $2000 and thats all there was to it. Much easier to justify $1500.



I love this car way too much. I usually keep a car 6-8 months, fix it, mod the hell out of it, get bored and sell it. In the last 20 years I have been through.... I dont know how many cars. Some of the cooler ones were Porsche 993, 964, 996 and 3 944s, 4 Corvetts, 27 Mustangs and I forget if 4 or 5 were Cobras, 13 Mark VIIIs (some are on at least 40 peoples desktop backgrounds), 3 Audis, Couple Mercs (hated that 98 E420 to death), 7 RX-7s - 4 were turbos, few Z32-300Z, Two Ferraris - hated them but they were the bad ones. 1984 Mondial and I forget what year the 328 was...... and just so much more.

Well the RS6 was quite literally a car I lusted after for 10 years and spent the last 3 years suffering driving a 96 Silverado every day so I could pay cash for when the right RS6 turned up. So this one is mine forever and no intentions of letting her go so I want to do it all the best I can and compared to all the other Audi sites and groups I signed up for this place and the people in this thread have taught me more about this car in a week than I ever thought I knew about the car.



Still have that one lingering question, what about the diverter valve?

[DHall1]

Just wait till you get it back and send me data logs.

I believe the SRM intercoolers are better than Wagners. But its just a hunch at this point

[LaserSVT]

SRM, will go check those out now. Thanks! As for the data, yeah just got to get the car back. My buddy is always... strange about his equipment so I think I will just buy my own system.

[RS Sick]

My bad fellas, I was under the wrong impression the stock ICs had a much higher leak rate.

Laser.... these two have forgot more than I will probably ever know about the RS6; heed their advice before dropping $1,500.

[LaserSVT]

Dangit David! I just checked out that intercooler, very nice. But they have one other part they sell for the RS6...... *drools*

https://scontent-dfw1-1.xx.fbcdn.net/hphotos-xap1/v/t1.0-9/12004941_10205324670699583_1783314456897370277_n.j pg?oh=c6271c42d605fa859ed4682f391e7227&oe=566AF5AF
https://scontent-dfw1-1.xx.fbcdn.net/hphotos-xpt1/v/t1.0-9/12033152_10205324671619606_268963997679976612_n.jp g?oh=410c7048c21bd97ae6ba46257756a33a&oe=566A9A66

[Other_Erik]

Bill

You don't need to replace DV's unless they go bad. When they do, that's when you replace them. Don't bother otherwise, it's not a preventative thing unless you're planning on making your living putting the beast down the 1/4 mile.

As for the search function, it's easier to go to google and type in your search term along with "site:rs6.com" in the search box. The first link to load may go to a porno site, but if you go back and hit the link again it'll come to the right place.

O_E

[LaserSVT]

I had just figured with modifications that they would need to be replaced. I am originally from the 2.7T world where if you did a tune you had to do intake boot (blew mine up first day with chip) and that their diverter valves broke and broke often. I did go through several OEM sets.

Glad that in the big brother it seems they figured out those issues. :)