Thread: 3" exhaust on td5

Put a brick wall at the tail pipe end to shut the thing up..

Did he weld it or is it unboltable.. I wouldnt mind swaping my exhuast set up for your 3 inch.

I keeped mine 2.5 inch just put a hi flow center muffla on. Made it go better and no drorring sounds.

so do you think a high flow muffler will quieten it down

Yep and keep the rear brick wall you got on there now.

Gday Noogie - glad you got the Dfer back on the road again after Dargo.

D3Mike in Jan Juc

what is a brick wall?

Originally Posted by noogie

Hi all

I had my 3 " exhaust put in today on my td5.
There was a bit of a communication problem as the exhaust place has put a straight thru exhaust system in.
I did mention to him that I just wanted the centre muffler removed, but he has put a straight thru system in with a small resonator where the small front resonator was.

It sounds good and you can hear the turbo whistle, but it is a little too noisy when you put the foot down and when excellerating/cruising on freeway. It goes better with less turbo lag noticed but I need to quieten it down.
Does a straight thru system have any detrimental effect on the engine?
Should I have the original rear muffler reinstalled into the system to quieten it down?
Any suggestions would be appreciated.

Thanks
Mick

Won't do any harm - in fact it is a good thing.

Sellers of 2.5" exhaust kits will spread rumours of "turbo overspeed", however such a beast is yet to be observed in captivity.

For optimum performance straight through is the way to go but I do understand the noise issue.
A good option would be a straight through turbo muffler in front of the rear diff and the resonator at the back, this will prevent a lot of the noise and remove the drone under load.

Originally Posted by isuzurover

Won't do any harm - in fact it is a good thing.

Sellers of 2.5" exhaust kits will spread rumours of "turbo overspeed", however such a beast is yet to be observed in captivity.

Interesting you still claim this to be 'unseen' yet was proven in Lara - Which can overspeed off the line using its 3" system... Producing a massive boost spike.

Here is some more info: http://www.assuredperformance.ie/ass...0OVERSPEED.pdf

once a turbo is spinning beyond its designed limit, it can reach a point where the impeller fins are moving too quickly to allow air to move in behind the displaced air from the fins. without resistance from the air, the turbo speed skyrockets... this is the one of the reasons for wastegates.

Also, if the turbo reaches a point past the line on the left of a compressor map (I forget what it's called, surge line?) basically the turbo can/will destroy itself. It does NOT have to be overspeeding for this to happen. Very rare on diesels, shouldn't happen if the turbo is selected properly.

http://www.turbobygarrett.com/turbob...Tech%20103.pdf
^^^
By the turbo boys themselves! (See 3rd page "Speed Lines")

The bigger pipes can allow this to occur....


Remember - bigger sells.... Bigger lifts, bigger diameters etc..

If they could sell a 2.5" for $xxx and a 3" for $xxx+ 50% dont you think they would