Exhaust Crackle

[deecee]

Any ideas on how to get the crackle sound out of the exhaust (3" pipe) on an S3, under deceleration?

 

I have a new high performance cat, an abundance of 3" stainless steel tubing, and a tig welder.

 

I was thinking of running a straight pipe , but lengthen the overall pipe length by another 6 feet.

 

Any thoughts or advice would be appreciated. 

 

 

DC

[Kimbers]

Dee, I only got it with a non Cat Pipe. And on the Exige it was with a Sports Exhaust.

 

I think your only option would be a new exhaust.

[molemot]

Another SIX FEET????? Crikey...sure you don't mean six inches...??(!) Be hard to find six feet of space in an Esprit....

[deecee]

Nope, 6 feet.

 

I was planning on the pipe going down from the turbo to the back, and then once around the back like a trombone.

 

My idea is to slow down the sound waves by either lengthen the pipe and/or splitting the sound waves.

[molemot]

Crikey...an original idea!!!!! Don't forget to keep us updated on the results...and a recording of the sound would be good, too.

[deecee]

I was hoping someone had already tried it.

 

I was wonder if the system could be tuned by increasing the length by sliding one pipe inside the other.

 

This is either brilliant or I'm in need of meds.

[ChrisJ]

I get a nice crackle from mine (at least it sounds OK from the drivers seat) and I have a bog standard exhaust - new stainless back box, no cat though.

 

Chris

[Simon350S]

6 foot........????!!!!

That's insane.

[pete]

small p####s comes to mind

[molemot]

The First Mate's name was Cropper

By Gawd he had a whopper

Around the deck

Thrice round his neck

And up his **** for a stopper!!

[Bibs]

Mine used to pop and bang a lot with a Quicksilver Supersport and de-cat.

 

Six feet of steel kinda goes against the grain of a Lotus mate...

 

[Simon350S]

Your car did indeed sound cool mate....!

[red vtec]

Mine crackles and it only has the original lotus box on it.

Are you thinking of using a folded horn design? But for that to work you would need a small throat and a much larger mouth than a standard exhaust opening.

[Simon350S]

That's about 6' give it take.

I probably would have strapped it to the spoiler with some triangulated tubing design for support. Would save the boot space for sure...

Happy to help as usual.

[deecee]

LOL...

 

The extended pipe length will wrap around the cavity located between the rear bumper and the tranny, and in place the silencer...I wasn't talking about adding a smoke stack.

 

As I understand it, the crackle is caused by the fuel injection system dumping excess fuel into the cylinder under deceleration so as to avoid a momentarily lean fuel mixture.

 

I always wondered why none of the other manufacturers had to deal with it?