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Custom Split Exhaust System

futurewa

By futurewa,
in Engines & Forced Induction

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futurewa Contributor

futurewa

Posted
Posted (edited)

Hey Guys

I got my dream car but it's far too loud!

Some specs -

TRUST extended split dumps

EXHAUST TECHNOLOGY custom twin system with Apexi valve and custom cross over pipe...

Pic of split System

Pic of tail pipes

What is my best option for quitening the car down without ruining the performance?

I'd also prefer to keep the tail pipes rather than go for a single big drain pipe.

Thankyou..

Edited by futurewa
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R31Nismoid Grand Master

R31Nismoid

Posted
Posted

Get some decent mufflers mate, looks like you have two pissy cannons and thats it. :)

Which basically wont do anything... ! One of my mufflers is probably better than the two you have.

The cross-over's purpose doesnt reduce noise either, so not sure why you mentioned it :(

I have the same from section as you (Trust extensions), two BIG custom mufflers, 94dB 3.5" all the way and will flow over 350rwkw.

Done and dusted ;)

There have been a few "exhaust noise" threads now, and ive posted pics of mine in there 2-3 times so have a search if you want a visual.

gotRICE? Veteran

gotRICE?

Posted
Posted
sorry, but whats the point of the crossover section?

I think it has a similar effect to a balance pipe in v8's.

If you didnt have it it would be like having two 4cylinder motors creaming their balls off, and you would loose the V8 grumble.

And in this case, two 3cylinder turbo motors.

I wonder what that would sound like :)

STATUS Grand Master

STATUS

Posted
Posted
The cross-over's purpose doesnt reduce noise either, so not sure why you mentioned it :)

it does actually but your right those rear mufflers wont control the noise, must admit though marky mark is without a doubt the best exhaust shop in aus. im sure if you go back and say i want it quieter he will do it.

i wish i had the oppurtunity for him to do my ltd exhaust :) he has done plenty of work for me in the past and shits on anything else i have seen from anywhere.

Adz2332 Grand Master

Adz2332

Posted
Posted
I think it has a similar effect to a balance pipe in v8's.

If you didnt have it it would be like having two 4cylinder motors creaming their balls off, and you would loose the V8 grumble.

And in this case, two 3cylinder turbo motors.

I wonder what that would sound like :)

Yer to start off wid in my torana i had a twin exhaust and it didnt crossover and it had a reali bark sound to it.. sounded reali bad especially when reving up higher... then it was rewelded with a cross over, it lost the bark sound and made the lower V8 rumble stand out more... is beautiful :)

s13_Skyline_inside Proficient

s13_Skyline_inside

Posted
Posted

not a 100% sure but the purpose of the balance pipe on a v8 is to balance the back pressure between the two banks, so its not needed on a turbo car as the turbo's create the back pressue for the engine, not the exaust

but the system looks good, id just chuck a muffler on each side, should quiten it down a bit

R31Nismoid Grand Master

R31Nismoid

Posted
Posted
You'll need a couple (one for each pipe) of centre mufflers or silencers/resonators. That's the only way you'll get it quieter without changing the rear mufflers, which look too nice to change.

silencers/resonators wont do a thing.

R31Nismoid Grand Master

R31Nismoid

Posted
Posted

The cross over is something alone the lines of below, its probably not exact, but yeah... just a starting point.

To even the exhaust pulses/tone. (nfi the true term)

If you have 3 cylinders, and then 3 all the way to the rear without crossing, it sounds retarded as its not even (ie all 6).

So the cross-over lets this occur and giving it a good sound

That said, i had a ZJ fairlane many years ago no balance pipe and it sounded good.

futurewa Contributor

futurewa

Posted
  • Author
Posted

Yep, it's a GTR R32.

Ok, so it seems that I need to replace the existing mufflers with 2 decent big ones. The guy at the exhaust shop wanted to put in a single big muffler in the middle where the crossover is. Will that make the car sound wierd?

DCIEVE Mentor

DCIEVE

Posted
Posted

nice looking exh....are you running cats? (i found one cat was enough in addition to a shitty cannon to get my 26 quiet enough to go over the pits) otherwise some chambered mufflers somewhere in the middle will do the job.

sir racer; I had the same issue and ended up going with a custom made 4" muffler.... couldnt find a 3.5" anywhere (3.5" thin wall stainless is not an easy thing to find either - i ended up paying double for a 3.5" bend what i coudl get a 3" one for, sort off explains the lack of local 3.5" mufflers also)- cheaper in the end to go 4" if there was the room

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