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Power Limits Of Exhaust With Silencer

AngryRB

By AngryRB,
in Engines & Forced Induction

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AngryRB Grand Master

AngryRB

Posted
Posted

Just want to know has anyone reached 300kw with a silencer in the muffler,

I'll be getting my car tuned next week , would like to see 280-300kw,

Has a GTX3076 0.82 , external 44mm tial, tomei 256cams, 3 1/2inch exhaust but the muffler has the 2 1/2inch silencer. I've tried a 4inch Nur spec muffler on the rear but its crazy loud, and i could try another muffler in the front and that might help but i like the sound of the fujitsubo muffler as well cause its quiet at slow speeds.

So interested in opinions, will this muffler really hold the setup back enough to not use it ? If i cut the restrictor out how much louder will it be?

TiTAN Grand Master

TiTAN

Posted
Posted

piggaz managed to push his past 300kw with the 2.5" restrictor in it, but the turbo setup was capable of significantly more power and made significantly more power when that exhaust was removed.

change the muffler for a larger one or add a larger middle muffler and chop out the 2.5" restrictor plate.

AngryRB Grand Master

AngryRB

Posted
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how much power is significant?

The 4inch nur spec just sounds loud and drony, would i use a resonator or a muffler to bring out the RB sound? Just tossing up wether its worth losing some power to maintain a nice sound.

R31Nismoid Grand Master

R31Nismoid

Posted
Posted

Paul was also on E85, which changes the rules a little bit.

I've pushed a 3" exhaust to 370rwkw no problems when not using PULP.

2.5" will hurt the power, i certainly wouldn't push the car with such a small restrictor in there.

As you are external gate as well (assuming), that will also make it a bit easier. Still though... get it removed.

Piggaz Grand Master

Piggaz

Posted
Posted

piggaz managed to push his past 300kw with the 2.5" restrictor in it, but the turbo setup was capable of significantly more power and made significantly more power when that exhaust was removed.

change the muffler for a larger one or add a larger middle muffler and chop out the 2.5" restrictor plate.

400, well 402 but for an extra 5 psi (30 psi) it only made it 414. Now in a step back in turbo size with a twin 3 inch exhaust it was sitting at 426 with 8 psi less. Only changes were exhaust, dumps and smaller turbos. Oh and even back to factory airbox!!

Air has to get in AND out!

Would have loved to have seen a back to back with just the exhaust change.

How much of a restriction will a 2.5 inch hole will be on this car is anyone's guess. Maybe drop the 'diff back' once it's all done and do another run. That will give you the answer and only take a few minutes.

XKLABA Grand Master

XKLABA

Posted
Posted

400, well 402 but for an extra 5 psi (30 psi) it only made it 414. Now in a step back in turbo size with a twin 3 inch exhaust it was sitting at 426 with 8 psi less. Only changes were exhaust, dumps and smaller turbos. Oh and even back to factory airbox!!

Air has to get in AND out!

Would have loved to have seen a back to back with just the exhaust change.

How much of a restriction will a 2.5 inch hole will be on this car is anyone's guess. Maybe drop the 'diff back' once it's all done and do another run. That will give you the answer and only take a few minutes.

me to, especially with the RSs to see if it also help them come on sooner

AngryRB Grand Master

AngryRB

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I think ill just see what the tuner recommends, hard to see where a muffler could be welded in at the front, not much room with a lowered car, but at the back i can see a huge muffler could be put in there, so hopefully theres some decent 3.5inch ID mufflers that flow well and also cut down the drone and noise.

How do people bring out the meaty RB note? is it to do with the resonator or the muffler or even the tune???

MBS206 Grand Master

MBS206

Posted
Posted

I think ill just see what the tuner recommends, hard to see where a muffler could be welded in at the front, not much room with a lowered car, but at the back i can see a huge muffler could be put in there, so hopefully theres some decent 3.5inch ID mufflers that flow well and also cut down the drone and noise.

How do people bring out the meaty RB note? is it to do with the resonator or the muffler or even the tune???

There is HEAPS of room up near the gearbox for a VERY decent muffler.

I had a 5" body on mine near the gearbox. (In fact, it's still there...)

AngryRB Grand Master

AngryRB

Posted
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Posted (edited)

so tell me , how did it sound then? what brand of muffler, redback has been mentioned by an exhaust shop,

from what i can see under there the dump and cat take up alot of room, i dont wanna chop it all up and make a mess and have to waste money if its not neccessary.

was that an oval muffler? what power did yours make too?

if im going down this track of having a bit of a noisy exhaust then id atleast like to hear the meaty angry RB note, quality still not just loud noise.

Edited by SliverS2
AngryRB Grand Master

AngryRB

Posted
  • Author
Posted (edited)

went round a few exhaust shops today, was told theres not enough room for a muffler anywhere but the rear, and the ones they showed me looked cheap and nasty like they imported them from china, brands like redback, gennie where mentioned and prices of $350 spoken about so i just got the fujitsubo welded back on for now,

going to see what it can do on the dyno, maybe have the catback removed to see the difference before doing anything more, so ill be a ginnea pig for this experiment. :whistling:

having thoughts about cutting it out too, wonder if a 3inch pipe could be welded back in to mimick the silencer effect?

Edited by SliverS2

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