Turbo with two stage exhaust - RX8Club.com



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Old 06-25-2016, 10:53 PM   #1  
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Turbo with two stage exhaust

This is the exhaust system I recently fitted . It is still a work in progress because I'm not really happy with the tone or the loudness of it . I'm sure with an extra muffler and some tweaks it will sound better .
Reason for doing it was to reduce turbine backpressure mainly as I found that at 400whp the 3" system wasn't doing the job well enough . This setup cut backpressure by a good 5psi at the turbine.
Also I wanted the novelty of having a loud exhaust on demand .
Left side is main 3" exhaust and is nice and quiet for around town and trips. Right side is wastegate only so there is no flow until turbo reaches the set boost pressure.









This is at 4 psi boost:

At 15psi boostpressure :

Last edited by Brettus; 11-02-2016 at 02:17 PM.
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Old 06-26-2016, 02:26 AM   #2  
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that sounds a lot better than I thought it would
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Old 06-26-2016, 03:21 PM   #3  
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that sounds a lot better than I thought it would
It sounds quite good from inside the car actually . Just too loud and too much of a staccato . I think I can improve both of those things ...hopefully ending up with something pretty cool.
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Old 06-26-2016, 03:47 PM   #4  
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Nice!!!
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Old 06-26-2016, 04:09 PM   #5  
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Sounds good man.
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Old 06-26-2016, 05:28 PM   #6  
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I've probably watched this 30 times in the last 10min. The more I listen the more I like it.
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Old 06-27-2016, 04:13 PM   #7  
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It's kinda cool to be able to emit a very loud noise at will .........LOL

From inside it sounds a bit like a high revving v8 on launch control . It's really a LOT louder than that video suggests .

Last edited by Brettus; 06-27-2016 at 04:20 PM.
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Old 06-29-2016, 07:03 PM   #8  
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Quote:
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It's kinda cool to be able to emit a very loud noise at will .........LOL

From inside it sounds a bit like a high revving v8 on launch control . It's really a LOT louder than that video suggests .
If you dont like it that much ill take it

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Old 07-14-2016, 10:06 AM   #9  
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nice work........
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Old 07-15-2016, 01:15 AM   #10  
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nice,

i have missed much.

beers
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Old 07-17-2016, 07:51 PM   #11  
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Doing this is fun ..........

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Old 07-17-2016, 07:57 PM   #12  
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Old 10-26-2016, 10:46 PM   #13  
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Added a resonator to the wastegate side . Much happier with sound . Still loud but not obnoxious like it was .

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Old 10-27-2016, 11:38 AM   #14  
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Sounds mean, I like it.
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Old 07-11-2018, 03:50 PM   #15  
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Just curios why no one done that before on RX-7 or RX-8 to split exhaust pipes on stock rotary engine like here except without turbo (only rx-8 related).

Also any update on this build?
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