Butterfly valve on exhaust?

[rolibaf45]

Hello all.

I've searched everyone and can't really find any information regarding a butterfly valve on a diesel? Is not a good idea because carbon buildup would be very fast ultimately sticking the

 

valve one way? I just bought a 2005 3500 that I use for my personal truck as well as my tree service company I started this year. I have removed the catalatyc converter as well as the

 

silencer ring and air baffle on the turbo. I do a lot of in town work and would like to keep the quiet disposition of the truck while going to and from jobs but I also put a lot of miles on the

 

highway pulling very heavy loads of wood and saw chips. I think this set up would be ideal for me and my situation. Any help would be appreciated!

[rolibaf45]

2 hours ago, rolibaf45 said:

Hello all.

I've searched everyone and can't really find any information regarding a butterfly valve on a diesel? Is not a good idea because carbon buildup would be very fast ultimately sticking the

 

valve one way? I just bought a 2005 3500 that I use for my personal truck as well as my tree service company I started this year. I have removed the catalatyc converter as well as the

 

silencer ring and air baffle on the turbo. I do a lot of in town work and would like to keep the quiet disposition of the truck while going to and from jobs but I also put a lot of miles on the

 

highway pulling very heavy loads of wood and saw chips <removed> I think this set up would be ideal for me and my situation. Any help would be appreciated!

thanks in advance for any useful input.

Edited August 4, 2023 by Duncan
spam link removed

[GTSBoy]

Put the f**king catalytic converter back on it and stop being a f**king retard.

[hattori hanzo]

37 minutes ago, GTSBoy said:

Put the f**king catalytic converter back on it and stop being a f**king retard.

 

 

lol Hollier than thou much  

 

 

[joshuaho96]

4 minutes ago, hattori hanzo said:

 

 

lol Hollier than thou much  

 

 

Nah full decats are obnoxious AF to everyone behind you in traffic. If it's not a track car you trailer to and from the track you should run a cat.

[GTSBoy]

5 minutes ago, hattori hanzo said:

 

 

lol Hollier than thou much  

 

 

f**king kÜnts that drive decatted anything on the streets, let alone f**king 3500 series trucks spewing diesel soot all over the place can all go and f**k themselves and their sisters. And anyone who supports their right to do so can pull their pants down and wait in line too.

[soviet_merlin]

Spam bot shenanigans? Same post from 2014:

https://www.cumminsforum.com/threads/butterfly-valve-on-exhaust.1342561/

Yeah, it sticks a sneaky link into the quoted post. Though that original post looks like a real person. I hope he reconsidered it since.

[Duncan]

+1 point for soviet_merlin spotting the sneaky spam (now removed)

-1 point to gts_boy for going off at a bot

[GTSBoy]

Just now, Duncan said:

+1 point for soviet_merlin spotting the sneaky spam (now removed)

-1 point to gts_boy for going off at a bot

Nah, I got to go off at hattori hanzo as well, so I probably come out even.

[hattori hanzo]

for the record I do have a functioning cat 

but go back 10 years ago and a broomstick mod was  encouraged on this very forum! 

[joshuaho96]

7 minutes ago, hattori hanzo said:

for the record I do have a functioning cat 

but go back 10 years ago and a broomstick mod was  encouraged on this very forum! 

Probably the average age of everyone here has moved up a decade too and people have re-learned the lessons of the 50s and 60s. Only takes a small group of people decatting their cars to have a significant impact on local air quality. 

[r32-25t]

Only cat I’ve got is a hello kitty cushion sitting in the back seat 

[MBS206]

My current daily drive has no cat converter.

My previous daily driver has no cat converter.

 

Granted, previous one is old school Diesel.

Current one is an EV

[PranK]

2 hours ago, hattori hanzo said:

for the record I do have a functioning cat 

but go back 10 years ago and a broomstick mod was  encouraged on this very forum! 

Yeah I'd agree with that. My Gtst had a gutted cat. Made people sick behind me.

Now I'm keen to buy high flow dumps for the 335i and they're twice as expensive as the catless dumps! Its not surprising why people ditch them.

Btw, this looks familiar... https://www.cumminsforum.com/threads/butterfly-valve-on-exhaust.1342561/

 

[PranK]

4 hours ago, GTSBoy said:

Put the f**king catalytic converter back on it and stop being a f**king retard.

I don't think OP actually exists but I do like seeing you go off at it.

 

[GTSBoy]

I normally report the bots rather than getting sucked in by them. There was something about this one though....Aroused the need to kill.

[The Bogan]

On the bots topic: I too was an idiot and decatted some, yeah, all, of my old street cars thinking that that would give me more powers

It did make the exhaust a little louder, and I may have gained a killerwasp or 2, but the fuel smell was fairly horrible 

He'll, the bogan cruise ship had 100 cell cats when I first got it, they did nothing for removing the stink

Replacing the 100 cell cats with some actual Euro spec ones fixed the stench

For a potential killerwasp or 2 running a decat on a street car is silly

And this guy doesn't want to kick you in the balls >

[Dose Pipe Sutututu]

30 minutes ago, The Bogan said:

Replacing the 100 cell cats with some actual Euro spec ones fixed the stench

Euro 4 or 5 or 6 spec?

I'm heading down the same path (soon), however might do a 3" AES valve to bypass the cat/mid muffler and join back to the rear muffler if post turbine pressure creeps up.

Similar to this:

https://www.facebook.com/project7dere/posts/pfbid02TRQxyu9g19CJc1wit6yddh9WyDhjo3uabivNzsG5r5DhjWkg2ZPfgtUuLG4rGMhVl 

i.e. no Western Sydney GT-R mode

[R3N3]

We have pretty loose emission laws here in NZ and I did not need a cat to keep my car legal…. However I may look to install one in the future as I’m hoping it will also remove a db or two from the volume of the exhaust.

[Murray_Calavera]

1 hour ago, Dose Pipe Sutututu said:

Euro 4 or 5 or 6 spec?

I'm heading down the same path (soon), however might do a 3" AES valve to bypass the cat/mid muffler and join back to the rear muffler if post turbine pressure creeps up.

Similar to this:

https://www.facebook.com/project7dere/posts/pfbid02TRQxyu9g19CJc1wit6yddh9WyDhjo3uabivNzsG5r5DhjWkg2ZPfgtUuLG4rGMhVl 

i.e. no Western Sydney GT-R mode

 

If you get a chance to do before/after dyno runs when you throw the real cats in I would be super keen to see the results