Exhaust modification

[Izso]

Guys,

I have a 3" straight flow exhaust setup on my turbo car. I have a mid-box resonator (pretty large one and is straight flow) and a pretty large straight flow rear muffler. But it's still loud and the droning at 2.6-3k rpm is killing me since I'm in that rev range a lot.

I've been reading up about side-branch resonators and helmholtz resonators. It's those weird branch exhaust add-ons that apparently take away the droning by cancelling out certain frequencies depending on length of the resonator.

Anyone tried this with positive results?

 

[stupidcar]

I have seen Adam LZ doing this on his 350z, dual. Useless. Apparently well known brand still.

 

[^pomen_GTR^]

my suggestion is better and cheaper to go with dual resonator instead...


this frequency tune especially exhaust require a lot of trial and error...

 

[Izso]

I have seen Adam LZ doing this on his 350z, dual. Useless. Apparently well known brand still.

Well known brand? Didn't know there's branded resonators out there. It didn't help to reduce the drone for Adam LZ? I'll go google this.

my suggestion is better and cheaper to go with dual resonator instead...


this frequency tune especially exhaust require a lot of trial and error...

Well, if I can't fit another reso then I won't really have much of a choice. Trial and error is scary

 

[vr2turbo]

That is the reason, I don't use my VR for outstation. The droning is really bad........lol

 

[mag9556]

change back to ori setup with bigger inch pipe not more than 2.5 inch, it will be smooth and nice sound like feel nothing..

 

[Izso]

change back to ori setup with bigger inch pipe not more than 2.5 inch, it will be smooth and nice sound like feel nothing..

I'd have to change a lot of things if I did that. Including the downpipe, manifold, turbo housing... not gonna happen

 

[vr2turbo]

What about the resonator box you have been asking the rest to try out, will that unit help?

 

[Izso]

What about the resonator box you have been asking the rest to try out, will that unit help?

no cuz I need 3".. that's 2" only.

 

[vr2turbo]

no cuz I need 3".. that's 2" only.

So getting a box with that size also less? Never touch exhaust for a long time already. My VR one stainless steel since transplant......lol

 

[Izso]

So getting a box with that size also less? Never touch exhaust for a long time already. My VR one stainless steel since transplant......lol

Not less, just not a lot of demand so not a lot of people sell

 

[vr2turbo]

Not less, just not a lot of demand so not a lot of people sell

That is always the problem, like rare cars, less parts. Non common tyre size also difficult to find.....

 

[^pomen_GTR^]

no cuz I need 3".. that's 2" only.

i got a suggestion... find a place where lorry/busses do their exhaust... those kind of shop can custom muffler?resonator according to your size...small or big also can...

coz 3" is common for lorry and busses...


downside is probably come in normal mild steel...no SS material..

 

[vr2turbo]

But his car not so mush space like lorries and buses.....hhahahhahha

 

[Izso]

Let's see how it goes. Until I get the car back I won't know how best to proceed.

 

[vr2turbo]

Let's see how it goes. Until I get the car back I won't know how best to proceed.

We got a MIG welder and DIY......hhahhahahhahaha

 

[Izso]

We got a MIG welder and DIY......hhahhahahhahaha

who has the welder?

 

[vr2turbo]

who has the welder?

Sorry, wrong tense. Should be we "get"...lol
I only know Joe has but that is in his work place.....lol

 

[WilsonTHarv]

Guys,

I have a 3" straight flow exhaust setup on my turbo car. I have a mid-box resonator (pretty large one and is straight flow) and a pretty large straight flow rear muffler. But it's still loud and the droning at 2.6-3k rpm is killing me since I'm in that rev range a lot.

I've been reading up about side-branch resonators and helmholtz resonators. It's those weird branch exhaust add-ons that apparently take away the droning by cancelling out certain frequencies depending on length of the resonator.

Anyone tried this with positive results?

View attachment 571443 View attachment 571444

I have seen a video on youtube about installing helmholtz resonator on a galant vr4 to reduce drone ... he get a quite positive result with it ,maybe you could check it out if u haven't watched it .

 

[ixeo]

if I had to guess, from my own experience it’s because the diameter of the pipe is on the big side thus it drones.

 

[Izso]

I have seen a video on youtube about installing helmholtz resonator on a galant vr4 to reduce drone ... he get a quite positive result with it ,maybe you could check it out if u haven't watched it .

Yeah thanks. Will look at that

 

[^pomen_GTR^]

if I had to guess, from my own experience it’s because the diameter of the pipe is on the big side thus it drones.

told him to reduce the size... but he didnt want to...

 

[WilsonTHarv]

Yeah thanks. Will look at that

Here's the link

 

[6UE5t]

Use mugen style twin loop muffler at the rear, it sounds soft/not droning but yet still sporty. I'm using that type of muffler on my Mark X and pretty happy with them but not sure if it is suitable for high powered turbo cars and if it's available for big 3' pipes like yours.

 

[vr2turbo]

I think you original muffler the fiber glass all gone already. Like my VR when new it does not drone that bad, but after years of use the drone has become louder.....lol