Thread: Diesel Exhaust Silencing.

IMO you'll need a resonator on the back as well as a main muffler going from my experience with a 3" exhaust on a Tdi.

The resonator I have is just a perforated tube type, but it works well.

Without any silencing at all the resonance was horrific, the cab become a resonator
The noise was shocking too, it would have well and truly exceeded any noise test you'd care to name at WOT, including an F111 at take-off I'd reckon.

I'm going to try a Hooker Aero chambered muffler.
It's a straight through design but has a venturi section at the beginning followed by a larger, perforated chamber to slow the gas speed and hopefully break up the sound waves.

I have one, but the wrong one turned up (offset) and it's been a few months and the importer hasn't got any centred/centred's in yet (or as of December)



The other type I wanted to try was a Moroso spiral type, but they didn't have stocks of those either.

Hello
I run a straight through exhaust 3 inch on my TD5 and get a bit of a drone with a VNT there was more of a drone with normal turbo, depends what you are looking for a nice note..........or something that makes it go better.
Ian

I run standard size pipe on my Disco 1 TDi, I replaced the original LR muffler with a same size straight pipe and left the original LR resonater on the rear, no droning, pleasant, non obtrusive sound and goes a bit better, esp. off the mark, cost $50 fitted, Regards Frank.

^ thats what I've got on my Tdi,no drone at any time. Pat

Originally Posted by Tank

I run standard size pipe on my Disco 1 TDi, I replaced the original LR muffler with a same size straight pipe and left the original LR resonater on the rear, no droning, pleasant, non obtrusive sound and goes a bit better, esp. off the mark, cost $50 fitted, Regards Frank.

Originally Posted by PAT303

^ thats what I've got on my Tdi,no drone at any time. Pat

When you go up in diameter from stock with a small displacement engine is when you start to have noise/drone problems.

On this same topic....now, don't laugh - but what might be best for a 2.25D? I will be getting an exhaust in the next few months....

Originally Posted by Johnno1969

On this same topic....now, don't laugh - but what might be best for a 2.25D? I will be getting an exhaust in the next few months....

Nothing larger than 2" tube, mufflers of your choice.

Thanks guys.

So just to be clear, perforated straight through resonator in the middle and a baffled muffler out the back?
As I understand it, you need to break the resonant frequencies in the middle of the pipe and then the muffler/silencer at the end is for taking out the residual pulsing?

I want this to be no noisier than any other standard diesel ute/4wd. It's a fully stickered work car.