Power Limits Of Exhaust With Silencer

[AngryRB]

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?

[Moodles2]

General rule of thumb (not exact) 2.5" flows 250kw, 3" flows 300kw, 3.5" flows 350kw etc.

[TiTAN]

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]

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]

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.

[AngryRB]

its off the car at the moment, and the 4inch nur spec is on, just the db issue, guess ill have to try a middle muffler, or two...

[R31Nismoid]

Where is the silencer on the 3.5" system?

If you can just cut it out - sounds like the best solution?

[AngryRB]

its in the rear muffler, i guess its worth a try, save me some money at the exhaust shop too

[Piggaz]

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]

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]

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]

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]

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 May 1, 2012 by SliverS2

[Bsa]

Put a mid muffler just up from the diff there should be a space for it

[zebra]

Lol redback

Find a decent muffler please

Borla/hooker/magnaflow/Remus etc

All have GOOD 3 1/2"-4" mufflers in a heap of sizes

[AngryRB]

cheers an invaluable input, ill mention those brands to whoever is fitting it.

[zebra]

Get a tape measure measure up and order the muffler from the USA and then pay pennies for it to be fitted

[DVS JEZ]

+1 for a hooker muffler. My drifter has a full 3inch straight through exhaust with 1 hooker muffler at the back. Best sounding RB i have heard for a while

[AngryRB]

What is a hooker muffler like , is it a big oval design? Would it be loud enough for cops to pull you over?

[AngryRB]

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.

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

Edited May 2, 2012 by SliverS2