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Old 10-03-2014, 11:23 AM
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I heard this a while back and fell in love with it. It still needs some tweaking, to get rid of that snapping and popping, but very unique. I would have never thought to drop a ferrari 360 muffler in a subaru WRX.
Too bad it wont fit in a sterling...

https://www.youtube.com/watch?v=bKmVfsplSKA

Last edited by ydeardorff; 10-03-2014 at 01:03 PM.
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Old 10-03-2014, 08:56 PM
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Or I could just fork out for a muffler with it designed in.

Bypass exhaust system-db9-muffler-800x466-.jpg

Less than 200 bucks,...

And yes, you read it right it says Aston Martin on it. Its a DB9 muffler with vacuum bypass valves in it.
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Old 10-04-2014, 03:02 AM
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Wow, sit that over the gearbox with reversed J pipes etc, where's the nearest DB9?.
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Old 10-04-2014, 04:59 AM
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You( and others) have mentioned vacuum operated valves a few times. Under boost conditions there is no vacuum(the system is under pressure), where is this vacuum coming from that is suppose to operate these valves??

I think once you get to installing the exhaust and you find out that there isn't that much space to work with you'll be happy with something that will just fit and these dreams of making it sound like something that it isn't will disappear.


Brett
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Old 10-04-2014, 05:40 AM
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I'm in deep doo doo then as my Mercedes has a turbo and vac operated everything, in fact when the pipe from the EGR came off I lost nearly all power, gutless. Think brake servo, that's vac operated. The DB9 sure has boost and vac op, exhaust. Could always run a vac pump as on early diesels.
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Last edited by Peter; 10-04-2014 at 05:43 AM.
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Old 10-04-2014, 06:08 AM
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Quote:
Originally Posted by Brett Proctor View Post
You( and others) have mentioned vacuum operated valves a few times. Under boost conditions there is no vacuum(the system is under pressure), where is this vacuum coming from that is suppose to operate these valves??

I think once you get to installing the exhaust and you find out that there isn't that much space to work with you'll be happy with something that will just fit and these dreams of making it sound like something that it isn't will disappear.


Brett

There isn't vacuum in the intake before the turbo?
Im losing the gas tank in the rear and relocating it to the nose. So there should be room for this in its place. Im just trying to see what my options are, and don't want it to sound like anything but itself. I can audibly identify a WRX from more than a mile away. I don't want that if I can help it.

I know, Im just being fussy

Last edited by ydeardorff; 10-04-2014 at 07:06 AM.
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Old 10-04-2014, 02:58 PM
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Quote:
Originally Posted by ydeardorff View Post
There isn't vacuum in the intake before the turbo?
Im losing the gas tank in the rear and relocating it to the nose. So there should be room for this in its place. Im just trying to see what my options are, and don't want it to sound like anything but itself. I can audibly identify a WRX from more than a mile away. I don't want that if I can help it.

I know, Im just being fussy

Is the turbo located between the engine and throttle body?? If so then yes there would be a vacuum between the turbo and throttle body.

If its located between the throttle body and air filter(this was the setup I was thinking about) then no there would be no vacuum. If you do have a vacuum with this setup then you have a restricted intake.
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Old 10-04-2014, 09:31 PM
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When I was reading this thread I was getting a bit lost to the main purpose of the bypass valve, then I stumbled across this article which is very well written and self explanatory.


http://www.forzacomponenti.com/docum...er%20Paper.pdf

Some of you may find it useful
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Old 10-04-2014, 10:45 PM
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The 2.0 wrx turbo engine is configured as follows:
Aircleaner, turbo, intercooler, intake, engine...


Given the restriction (even if small) between the turbo inlet, and the air-cleaner there should be enough vacuum there to operate the system. If not I can look elsewhere including using the TPS for actuation.
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Old 10-05-2014, 03:47 AM
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As wot I said, init?
You will always find vacuum at the brake servo, trace that back to source.
Bit academic on a small 1641VW, who wants to hear BURBLE BURBLE instead of burble, burble but by tuning harmonics of my exhaust tip length to my inlets and an internal 'whistle' via two straight through Opel mufflers I have a very nice sound at 4,000rpm and up , still sounds like a VW low down though
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