mufflerectomy...

[devonutopia]

So does it improve the exhaust sound of a Normal Remapped TDI such as mine? (ie no induction kit or anything)

simple answer = yes.

I had the standard exhaust with just a decat pipe and hi-flow backbox on and that sounded decent enough with my pre-remap 150hp, then when the remap was done it boooomed big time on full chatter. Now I've got just the single pipe you can hear me coming from half a mile away on full chatter.

 

[prc]

the sound will actually also depend on the remap...
If your running with the vnt.mech fully open the exhaust sound will be slightly different (deeper sounding).

 

[DIFT]

So me with basically a standard 160 with Revo, the sound should fairly decent???

(maybe I dont need a petrol after all )

 

[devonutopia]

So me with basically a standard 160 with Revo, the sound should fairly decent???

(maybe I dont need a petrol after all )

Yup - I never realised the type of map really affected it, but a straight through pipe doesn't sound bad when the map is pushing 2 bar and fuelling like a biyatch.

This vid has some audio, and a lot of smoke.... toward the end of the clip. 3mb

http://altarmoore.com/jason/CCOMBE2006/SMOKE4.wmv

 

[DIFT]

Cool, just need to find somewhere now that can do it, with a Cupra style tip

Bit of smoke there Jason!!!! lol

 

[Red LCR TDI]

Jason, you got no cat either on there then. and it passes MOT's? do they not bother with the cat on diesels, and literally just do a smoke test?

i guess it would only smoke like that under load anyway, so that wouldn't be a prob.

 

[DIFT]

Im going to get this done next week I reckon. Just a small bit of pipe where the back box should be, an then a Cupra style tip on the end.

Hopefully should sound better

(diesel cats are pretty efficient, so im leaving mine on)

 

[devonutopia]

Jason, you got no cat either on there then. and it passes MOT's? do they not bother with the cat on diesels, and literally just do a smoke test?

i guess it would only smoke like that under load anyway, so that wouldn't be a prob.

I wish I knew - I was fearing the worst this coming MOT due to it being its first since the full pd130 conversion and it flew through emissions, and only had minors for other things like well worn front tyres (that WAS a surprise )

But whatever gases the MOT testing machine tests for, a decatted TDI would appear to not emit them?! Also, you might notice mine only smokes under heavy load and W.O.T.... I think the MOT test is done at idle, no load, and just throttle blipped to 3500 and back (or similar?)

Oh, and a cat might be efficient, but its not as efficient as a "space"

 

[DIFT]

Got quoted £120 to take the back box off with a fancy tip. Reckon I take the plunge then?

Im not going to loose any power am I? Guy at the place was a bit sceptical, saying I'd have very little back pressure, and the turbo would hardly spool up. Im sure he's wrong, but anyone want to put my mind at rest?

 

[muddyboots]

I can't see how reducing backpressure can *worsen* turbo spool up

 

[DIFT]

Dont ask me lol, i know nothing. Im going by what you boys have said. Think i'll ring him up and get it done next week

You ever had it done muddy?

 

[devonmikeyboy]

Got quoted £120 to take the back box off with a fancy tip. Reckon I take the plunge then?

Im not going to loose any power am I? Guy at the place was a bit sceptical, saying I'd have very little back pressure, and the turbo would hardly spool up. Im sure he's wrong, but anyone want to put my mind at rest?

HE IS WRONG !

Is that clear enough ?

 

[muddyboots]

Dont ask me lol, i know nothing. Im going by what you boys have said. Think i'll ring him up and get it done next week

You ever had it done muddy?

No, but might consider it when the silencers, sorry - mufflers - rust out and need changing on the Passat...trouble is I'm not supposed to be modding this car

 

[DIFT]

HE IS WRONG !

Is that clear enough ?

Cool, i'll sort this out soon, and get back to you all
Thought I was trying to save up

 

[basstard]

the guy clearly underestands **** of engines,,,
the turbo doesn't need backpressure!!! it's the engine that needs it because of mixture flows into the cylinders,,, but in turbo cars, the restriction is the turbo itself and the engine has enough backpressure,,, I wouldn't do this to an NA car, think we all remember what happened to mk3 golf gti's when all the chavs of long time ago removed the cat,,,

 

[DIFT]

8am tommorow its going in. Still got to decide on what tip to have. Cant wait though, hopfully the car will sound a bit more purposefull (sp?).

Annoyone else getting this done?

 

[muddyboots]

As Stew mentions there's really not alot in the change. You do get better spool-up and cooler EGTs which is a very good thing (and higher mpg).

Just picked up on this quote from earlier.

When you say it improves MPG, is this by any noticeable amount ?

I'm guessing that because the ECU overfuels to try and make the turbo spool up, if it spools quicker that means less fuel used ?

So which of the following do people reckon would give the best improvement on my Passat:
1) Decat
2) Remove middle silencer
3) Remove rear silencer

 

[EdButler]

Wheres the 4th option Muddy?
4) Remove the lot

Ive just had a Mufflerectomy done on mine 3 days ago. I must say it sounds very nice - very deep and raspy, although only gets loud(ish) if you give it some welly. It barks on startup which is my favourite part

Turbo spoolup is definitely quicker and more aggressive, id say it does it in half the time which makes the car somewhat jerky around the city - but who cares!

I have a 53 Ibiza which has 2.25" pipe IIRC. There was only 1 silencer so i guess i only have the CAT now. I went for a 6" x 4" oval with the Cupra Bumper, which looks quite nice, but i believe this is what resonates and amplifies the noise (maybe better going for a twin if you want a quiet option).

Ill try to get some vids up of it...

 

[muddyboots]

Wheres the 4th option Muddy?
4) Remove the lot

That inadvertently happened to me once with a Mk1 Golf.

The exhaust just fractured and broke cleanly apart, just behind the gearbox.
I tied it up so the pipe wasn't gouging along the tarmac, but by the time I'd got home, all the underseal had melted/burnt off the bottom of the bulkhead where it met the floorpan Was getting a bit warm in the car too...

 

[devonmikeyboy]

Out of the three i would say ditch the rear box as that always seems to be the most restictive. Then again l agree with EdButler and ditch the lot if it was my passat.