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  #1  
Old 04-06-2014, 02:50 AM
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Bimodal exhaust - can it be modified?

G'day,
Has anyone looked into ways to modify the Bimodal exhaust to keep it always open (Loud)?
I know in other cars (HSV's) with bimodal exhausts there are ways to reverse valves etc to stop the air pressure from running to the exhaust butterflies that cause them to shut at certain revs.
Thanks for any info!
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Old 04-07-2014, 08:53 AM
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Re: Bimodal exhaust - can it be modified?

You don't want to do this. The valves are pretty much always open anyways. They only shut when MDS is engaged. The SRT is nothing like the Cayenne or other brands with valves. With them you are correct, open the valves (sport mode) and it gets noticeably louder. The SRT is not like that. They are primitive mechanical valves whose only purpose it to make MDS mode sound less like a weed eater. Keeping the valves permanently open will not make it louder.

If you insist, just wire them open.
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Old 04-08-2014, 08:04 PM
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Re: Bimodal exhaust - can it be modified?

Quote:
Originally Posted by A-kon View Post
You don't want to do this. The valves are pretty much always open anyways. They only shut when MDS is engaged. The SRT is nothing like the Cayenne or other brands with valves. With them you are correct, open the valves (sport mode) and it gets noticeably louder. The SRT is not like that. They are primitive mechanical valves whose only purpose it to make MDS mode sound less like a weed eater. Keeping the valves permanently open will not make it louder.

If you insist, just wire them open.
Thanks for your insightful response.
In my last HSV, the valves would close between 1500rpm and 3500 rpm effectively muting the lovely V8 sound. I was hoping the SRT didn't have the same system.
I've heard removing the middle muffler can give a bit more V8 roar so that might be my first mod when my car arrives in June.
Cheers
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Old 04-22-2014, 02:43 PM
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Re: Bimodal exhaust - can it be modified?

It also makes the jeep have a flutter sound at idle. I will trade a great idle sound for a slightly louder mds... I have mine always open...
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Old 04-23-2014, 06:41 AM
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Re: Bimodal exhaust - can it be modified?

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Originally Posted by gnasty1521 View Post
It also makes the jeep have a flutter sound at idle. I will trade a great idle sound for a slightly louder mds... I have mine always open...
Agreed.. How do you keep yours always open?
Thanks
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Old 04-23-2014, 10:49 AM
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Re: Bimodal exhaust - can it be modified?

Turn the knob to hold the valve open then take one of the ends of the spring and move it two positions. If it stays open you are good. If the valve does not stay open, put the spring end back to the original position and go two places in the opposite direction. Very easy, and doable with just hands.
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Old 04-26-2014, 05:58 AM
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Re: Bimodal exhaust - can it be modified?

Quote:
Originally Posted by gnasty1521 View Post
Turn the knob to hold the valve open then take one of the ends of the spring and move it two positions. If it stays open you are good. If the valve does not stay open, put the spring end back to the original position and go two places in the opposite direction. Very easy, and doable with just hands.
Thanks buddy - I'll give it a go!
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Old 05-03-2014, 05:58 AM
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Re: Bimodal exhaust - can it be modified?

How did it go?
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Old 05-07-2014, 06:51 AM
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Re: Bimodal exhaust - can it be modified?

Finally got the car today... So will give it a go in the next week
Thanks for the info
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Old 05-07-2014, 03:36 PM
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Re: Bimodal exhaust - can it be modified?

Just re-read your posts. BTW I removed the rear mufflers (or resonators nobody seems to know) right by the rear bumper.
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