Twin GT35's on 4psi

[jolio1994]

Honestly, nobodies ever tested them back to back so who knows; what I do know is that the factory S6/S8 intake manifolds will continue to deteriorate and add to the number of already gutted intake manifolds.

I pulled a stock donor manifold off a car last month, why was it a donor car? Because the intake flaps broke apart and I think a rivet entered cylinder 4 completely destroying everything in its path.

If anything, this would be a good preventative maintenence item if your worried about the European repair kit quality mentioned earlier.

But please don’t take anything from me as hard fact, I’m not staying NA and in my case SHOULD see improvements; just my .02 on the matter.

[Kaclaytor]

It seems like the only option available for s6 owners who don’t want to spend $4000 on new intake, or risk plastic falling into the engine. As well as the $700 air distribution housing that breaks/warps. Both issues my cheap car have.

[audis6]

https://www.drive2.ru/r/audi/s6/718062/logbook/

Anything can be done

[SIX6SIX]

Did they do before/after performance numbers? The last couple guys that did the R8 or Lambo manifold didn’t see any performance increases.

[justincredible]

@Kaclaytor

I have heard that, but have seen zero real world proof. So I think I will give it a shot with before and after draggy results. Biggest issue is lack of tuning options.

You can give it a shot. It’s actually been done several times. Both acceleration wise and I think 1 of the guys that did the lambo did a dyno test and found that he lost 45whp down low and didn’t pick up but maybe 5hp up top.

The best option before you do anything like this would be to just open the intake and gut the intake. There have been several acceleration and dyno tests for this. Both of the test that are on here can be found I’ll search. but it falls into the same as the short runner intake. You loose about 30whp down low and then up top is about the same perhaps slightly more.

Tuning has nothing to do with it. You can have the best custom tune there is and bad hardware is bad hardware. The fact is your cams have a duration and overlap for the multi stage intake. The cams and motor RPM are not set for high rpm short runner gains. As it’s been stated. Look at turbo cars they all have short runner intakes. Look at NA cars that run below say 7000 and look at all their intakes they all share the same things for a reason.

So in the end it’s a hardware issue not a software issue. Again if it was me and I’ll try to search to help find the results already posted on here and create a new post to help @jollo1994 sorry to spam your thread with intake stuff.

I couldn’t have less interest in your project but don’t want to derail your thread. as this seems to this point be the most talked about part of your project. LOL And I’m thinking this isn’t the thing you’re looking for people to talk about.

[jolio1994]

The adapter came in and is a beautiful work of art. ~$350 to have each side CNC’d is still mind blowingly cheap to me though, but anyways…

I have plenty of room to drill it out and weld some aluminum injector bungs into it as well as install some 550cc ev14 injectors and radium fuel rail.

Things to do still include reconverting the car back to a return style fuel system and mount the aem fuel pressure regulator on the firewall. I guess I need to order the direct injectors deletes as well.

[jolio1994]

To add from my last post, I had the adapters reversed (first picture shows it covering the fuel rail bolt hole). No issue, just figured it was worth mentioning…

I’m also have a full race spec harness made for the 5.2 and MaxxEcu Pro. Measurements were taken and can easily be replicated for a stock C6/D3 if anybody gets tired or their crummy harnesses.

If you have ever followed Norbert on the old 5 cylinder stuff, you’ll know he’s the best of the best!

[jolio1994]

Past few days were a little slow at work so I used the mill to drill into the adapter flanges at 30°. From there I was able to weld in some ev14 fuel injector bungs as well as mill off the insides of the bungs.

I more or less guesstimated on where they should sit, but it looks like they will allow for decent mixture properties with the boosted air . With that being said each port is spaced out to 3.543" (90mm) so they’ll line up beautifully either way. Plenty of room to run either the AMS / Radium Fuel Rail. Also painted the Valve Covers over the weekend. Thing is lookin absolutely MINT. Going to be a few weeks since I’m out of Avant spending money though

[10Banger]

Shaping up very well man! Props to constantly trail blazing on this

[audis6]

Keep all drawings if someone will doing same there is reference what how to do.

[jolio1994]

I will definitely keep this up so long as it doesn’t get moved to the misc category. Nobodies done anything with these other than simple bolt ons, but with them so cheap it’d definitely be cool to see more builds out there.

In the end I guess this can more or less serve as a pathway for others to follow if they choose to do so. With that being said I still have questions and need answers; mainly on sorting out the breather hose setup and electronic thermostat.

I ordered a PWN controller so start fiddling with values for the thermostat; It’ll be interesting to get that setup on the Maxxecu. Regarding the breathersetup, I’m still not sure. Need to do more digging.

Lastly, I got the exhaust manifolds, dump pipes, and downpipes blasted so I can get all that stuff Cerakote’d. I’m thinking a bronze’ish/gold?

[jolio1994]

I f*cking throught it would be more of a bronze’ish color instead of pee gold . Just curious… has anybody ever ran these with a catch can and if so did you drain it back into the valley?

[jolio1994]

Radium Fuel Rails came in today! Fit like a glove into my modified RS6 intake adapters I drilled and welded bungs into (if you’re ever doing it… 3.543" bore spacing is right on the money )

Need to make some tie down brackets for them and tackle the DI delete plugs with the heads on; should be fun!

Heat management is the name of the game now!

[jolio1994]

Motorsport spec harness is nearing completion and Norbert @srs_motorsports sent me some updates. He has all the proper measurements for factory C6 S6 engines and can make more (Potential group buy if mods approve?)

This one has been kitted out with provisions for the RS6 intake manifold MAP sensor and EV14 fuel injector plugs. Absolute unit of a harness and will be worlds above the deteriorating factory harness.

[jolio1994]

Radium offers a beautiful dual stage PCV / Seperator for the Audi R8’s, but requires a turbo inlet to rout it back into under boost.

Maybe have to look into cutting some holes in the headlights; it’s a tight fit! Lol

[jolio1994]

Rolled the car out today since I felt it hadn’t seen sunlight in ages. That Merlin Purple still pops even covered in dust

Radium fuel system and PCV should be here later this week as well as the DI plugs that’ll require tapping the cylinder heads.

After that we wait on the MAXXECU and harness and get to street tuning!

[jolio1994]

Little update! 5.2 V10 harness for MaxxEcu Pro is done and is a beautiful work of art

DI holes are tapped and plugged, Radium Fuel Filter and AOS-e are mounted (drains back into engine). The ChaseBays FPR will be here tomorrow and all the -6, -8, and -10 lines and fittings can get plumbed aswell.

Radium Fuel Rails are tied down the the head, I’d say we’re just about there!

Question… do any of the markings on the stock crank pulley indicate TDC, and if not does the JHM one have markings? I’ll need something for the first start-up to verify timing

[jolio1994]

Harness and ecu will be here tomorrow… Chase Bays Adjusted FPR installed, and fuel lines are all done minus the crossover for the rails, breather hoses are routed (excess gasses venting into downpipe and oil is draining back into the block).

I painted the strut tower and Radiator mount black post picture so thats pretty sick…

Basically just need to wire in the MaxxECu and figure out a base tune.

[jolio1994]

Had the catch can routed backwards… FIXED!

Anyways, Ready to throw the harness on and wire the ECU when they clear customs…

[DC-S6]

Incredible progress and I am really curious to see how the internals manage with the eventual power increase!