Q: external waste gates on RS6's possible?

[Jimmyz0rz]

I'm not the most turbo knowledged but I am learning, so here is what I want to know. I want to do a setup with a external waste gate like in the pictures i have posted. mainly cause i want to do a vent to atmosphere set up, so the first thing I was wondering was are these exhaust manifolds custom or an aftermarket cause they are all pretty similar, but i did see some key differences which led me to believe they were. and my next question was can you take a Turbo set up like the K04's or the JHM RS6R's and use them as external waste gates over the internals they come with stock? any help or info would be great. I also plan on doing my VTA like the guru pic where the wastegates have a pipe leading to underneath the car that way no fumes will be going through the firewall, etc.

if these are custom exhaust manifolds are their specs i could give a shop to go off of so they could make some without having to pull some off of a junk yard 2.7t or anything of the sort?

thank you and let the flaming begin cause I'm sure I said something stupid somewhere.





I just want to know if its possible to get the RS6 turbos to have external waste gates.

[aysix]

The problem is the gaping hole in the turbine housing.

[Scotty@Advanced]

yes it's possible but alot of work and I'm not sure if the gains will be worth the effort. However I'd suggest divorcing the waste gate flow via the down pipe not by adding an external waste gate.

[naudlee]

it can be done, but is not ideal with the placement of the turbochargers on these cars...

You could weld the flapper shut and add an external gate to the downpipe/manifold/wherever... but why.

The internal gates work fine for this app and would allow for more room, *lol*, than externals....

[Jimmyz0rz]

I just simply love the sound of a vta. I wouldn't route these to the downpipes, I would have a setup like the gruman one where his wastegates have a small pipe leading under the car.

[itguy]

Going to the extent of custom fabrication required for external wg's, you should pick up a set of gt's

[Jimmyz0rz]

Yea except I only want a 400hp s4. If I went gt's I would have to go all out and get the 28rs, and I can't afford that. Besides from all the "eliminator" pics I've seen those have internal wastegates as well.

[dingo7]

Who makes a divorced downpipe that is VTA?

[aysix]

Going to the extent of custom fabrication required for external wg's, you should pick up a set of gt's

stop advertising

[getslideways]

It would be a lot of custom work just to get the sound of a screamer pipe. If that is all you are after, then you might consider just adding electric cutouts to your exhaust. There are also vacuum/pressure mechanically activated valves too if you wanted it to only get loud only after a certain PSI.

Maybe I am misunderstanding what you are after, but I am getting the impression you are not looking to run external gates for any performance benefit, but just for the 'screamer pipe' sound that comes with a VTA or dump pipe setup. In that case, its a bit overkill to have custom manifolds made up with external wastegates, when a simple pair of cutouts would probably get you what you are after for a few hundred bucks. Maybe I mistook what you meant or were trying to achieve though.

[Jimmyz0rz]

No you're right. But idk anything about these cut outs. Ugh. Thought it would be simpler than this. As I saw all those builds with practically the same set up just 770 and gt28. But those turbo's booth come with internal wastegates as well... if I can figure out the turbo part it's self then the rest I don't care about because I know stainless exhaust manifold are going to cost me a pretty penny. Our I could buy some already made stainless exhaust manifolds and have a fab shop cut out and weld a spot for flange for the wastegates. Idk thinking out my ass.

[obijohn22]

It's totally possible. It will not be cheap though. Just depends on how much it is worth to you. If you can't do the work yourself... You will have $3000 into it minimum parts and labor. You could try and find some used log style mani's with wastegate flanges already installed... then you just need the dump pipes made. But it will also require a retune unless you do MBC in standalone.. Then you may have danger to stock block if you have one.... Some things to think about

[FlyboyS4]

Then you may have danger to stock block if you have one....

At 400whp? Or is there something else you are referring to that is specific to the modification the OP wants to make that would endanger the motor.

[Halfbreed]

stop advertising

Really dude. Your getting way to obvious and pushy with your keen marketing ploys.


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[getslideways]

No you're right. But idk anything about these cut outs. Ugh. Thought it would be simpler than this.

Here is a little info on an exhaust cutout and what it does, and how it works from Gearz:




Mechanically Controlled Exhaust Cutout activated only after a certain PSI:




~$350 gets you a pair of electric cutouts, and any decent exhaust shop with any experience doing aftermarket or custom stuff should be able to take care of installing them for you. It might be in your best interest to go to a local performance exhaust shop, tell them you would like to install exhaust cutouts, and have them look at the car and tell you what they can offer for you.

Installing custom aftermarket exhaust manifolds with external dumps, seems a bit overkill on a 400hp build, just to get added sound. Its a bit like killing a fly with a wrecking ball.

[obijohn22]

At 400whp? Or is there something else you are referring to that is specific to the modification the OP wants to make that would endanger the motor.

I was only referring to the fact that RS6's on a stock block and only an mbc in standalone may have long term reliability issues due to boost onset on that turbo. That's all. Rs6's can over power a stock block. Obviously not at 400hp though.

[dingo7]

http://www.maperformance.com/maperfo...2h-ss-evo.html

does anybody make something like this for the 2.7? It works extremely well for high boost evos.

[getslideways]

http://www.maperformance.com/maperfo...2h-ss-evo.html

does anybody make something like this for the 2.7? It works extremely well for high boost evos.

I think the closest thing I have seen to something like that for the 2.7 is a the Labree Split Downpipe. I don't believe it's a completely sealed diversion, so I doubt you could cut the wastegate tube and route it to run open: