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Big Boost With Exhaust Bung

Nocturnal
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Nocturnal Explorer

Nocturnal

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Car is running nice now that it is finally on the road. But the exhaust noise that it makes are un-bare-able. How do you guys get along with a car that is louder then mine is beyond me, I got an headache after just 30 minute of driving...slowly...

MUST BE OLD AGE KICKING IN!!! eek.gif

Anyways, to "supress" the noise as my neightbors wouldn't like it much either, I have got myself an Apexi ATS (Active Tail Silencer). I didn't go for the butterfly valve one is because I want something that is automatic, and I heard that the electronic version of the butterfly valve can go wrong and not open when they are suppose to. So full boost + close butterfly valve = Turbo in the Bin...

Saying that, the ATS silencer does open up on high load, but I am not sure how much it restricts the flow still. Right now I am limiting boost to 1.3Bar because of the restriction worries. The same setting on the boost controller without the exhaust bung will give a 1.35Bar boost.

I just want someone a bit more technical to confirm me that it is safe to run high boost (aiming for 1.6bar) with that bung. If it isn't safe, then what should be the limit.

The exhaust is a 90mm exhaust with no center silencer, the ATS is a 115mm one. The turbo is an HKS TA45S Turbo so most of its power will be from 5K-8K. It also run a screamer pipe so it will ease the exhaust flow a bit when it is on full boost.

Thanks for the help. I am enjoying every minutes of it (finally!!!)

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https://www.sau.com.au/forums/topic/167962-big-boost-with-exhaust-bung/
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Devils_Advocate21 Mentor

Devils_Advocate21

Posted
Posted

Better off getting an inner muffler along the way, ditch the cannon and go a better dual muffler at the end of it or add a resonator along as well, much better options take your pick. Good luck with that

Cheers

A

MANWHORE Grand Master

MANWHORE

Posted
Posted

mate, those exhaust thingies are shit. I have both an insertable bung that can go in the end. heavily robs power, and makes revs climb very slowly.

I also have an exhaust control valve - same as the bung. makes it a lot less powerful. revs climb about 1/4 the speed it used to. and the worst is, it's nto that much quieter.

Nocturnal Explorer

Nocturnal

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Posted

The Apexi ATS made a difference for sure. You can talk with it in, you cannot think with it out.

When it is on boost, all valve open, and screamer pipe on full chat, its fine. It is when you are driving normal speed at 120km/h that it really kills you.

I'll get it on a dyno and see how it goes. The 115mm bung was able to flow the same horsepower on a 300hp BCNR33 GTR, so it isn't that restrictive... Dyno show no difference around 300bhp as confirm by the American magazine dyno

But it is a big difference when you are talking about double of that power. :rant:

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