Truenotch

Muffler Tech

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Removing cat converter from 3AU 1500cc 4 banger, good practice to replace with resonator or not required? Will end up replacing most of the exhaust with 38mm tube and a new muffler as it's rusted out. So before I tuck the exhaust up too high, thought I better check about needing a resonator in there to keep things sounding as pleasant as it can. Don't want rasp.

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Will be louder.  So yeah  put something in its place if it only has one other muffler in the system

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larger size piping with resonator and  turbo or baffle type muffler vs larger size piping with two turbo or baffle type mufflers vs  smaller piping with resonator and straight through muffler

thoughts on performance/loudness? e.g . say 2.5" vs 3" on 200hp engine

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reso and baffle type mufflers will cut out different noises,  so always good idea to have one of each, to try avoid having  drone or rasp. 

depends how the 200hp is being made.  something na with big cams and overlap  is going to work best with least exhaust pressure possible.   otherwise 2.5" will be plenty. 2.5" bit easier to make quieter,  although 3" doesn't have to be loud if done right.   

if going with a baffled muffler , i'd step up the muffler a size or 2.  as pretty much none of them will flow as much as the pipe size they are made for. no point running  big tube then putting a cork in the end of it

to try shut the starlet up with 3" system, i run 2 reso style straight throughs,, then an oversized baffled muffler at rear to keep flow up.  

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Are there certain reso's that are better than others? Have seen a few brands (Coby, M&H), some with fibreglass, some with stainless fill. Worth upsizing muffler on a shit motor? 

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On range rover (4.6 V8) I put reso about 500mm after collector (2.5) then m&h flow master copy, 2.5 to the back. 

I just guessed where things would fit really, though I could move them around if need be. 

Roudy down low then gets quieter as revs increase. 

Anything to do with muffler placement? 

Shitty 60s tech RV8? 

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2 hours ago, Bling said:

Are there certain reso's that are better than others? Have seen a few brands (Coby, M&H), some with fibreglass, some with stainless fill. Worth upsizing muffler on a shit motor? 

Have driven a few cars with 3.5" exhausts, with adrenalin r straight through mufflers that work much better than you'd think - not that loud, no drone. All turbo cars though. 

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14 hours ago, kpr said:

reso and baffle type mufflers will cut out different noises,  so always good idea to have one of each, to try avoid having  drone or rasp. 

depends how the 200hp is being made.  something na with big cams and overlap  is going to work best with least exhaust pressure possible.   otherwise 2.5" will be plenty. 2.5" bit easier to make quieter,  although 3" doesn't have to be loud if done right.   

if going with a baffled muffler , i'd step up the muffler a size or 2.  as pretty much none of them will flow as much as the pipe size they are made for. no point running  big tube then putting a cork in the end of it

to try shut the starlet up with 3" system, i run 2 reso style straight throughs,, then an oversized baffled muffler at rear to keep flow up.  

this is on the 124 with supercharged 2L.  its 2.5" with a 2.5" coby and currently a 2.25" turbo style on the back as it was too noisy with a 2.5" straight through. both were just cheapies form chase. the whole thing is a bit crap as I have modified it a few times over the years and it gets banged up pretty often as there isn't much room to tuck things up under the 124 chassis which then makes vband clamps and flanges leak.

Also depending on how link/sequential tuning goes I could end up taking the S/C off and going turbo so Im thinking of going larger pipe size to future proof. Thinking oval tube so still 2.5" deep but 4" wide,  similar flow to between 3" and 3.5" . There really is only room for 2 silencing things,  one before the diff ~ 400mm x 225mm  and at the back similar size and has to be pretty shallow for a muffler, cant be much more than 125mm deep so no barrel type with dumpy tip may apply

11 hours ago, cletus said:

Have driven a few cars with 3.5" exhausts, with adrenalin r straight through mufflers that work much better than you'd think - not that loud, no drone. All turbo cars though. 

 good to know, I have been looking at their stuff, not cheap but when you compare to shipping similar spec stuff in it works out OK.

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if you want to make it better with what you have.  swap that 2.25 out with same design, but a 3".  keep pipe after muffler 2.5"  and shouldn't be much if any louder

But yeh if you are going to build a whole new system, with turbo a possibility.  what you have in mind should be good.  probably want to run a baffled muffler at rear supercharged  to keep noise down.  swap it out for a straight though if go turbo.  turbo stuff is easy to shut up

actually, just put a turbo on it to start with

 

 

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