Compressor Whine

Originally Posted by Eric SDV6SE https://www.aulro.com/afvb/images/bu...post-right.png
I will get the baffle removed and a straight section welded in. Friend of mine did the same with his D4 (now moved onto a D5...) sounded much better.

I've run mine with the safari snorkel intake facing backwards and with a filter sock on when on the beach and dusty bush tracks, crack the window open and you hear both wastegates through the intake, sounds really cool.

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Originally Posted by DiscoJeffster

Well strictly speaking you can’t hear the wastegate as it’s exhaust side, but you can hear the effect of reverse flow though the compressor of the turbo on throttle lift off as air reflects with nowhere to go. [emoji2369]

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As in the waste gate dumps unused/unneeded exhaust gas into the exhaust? With less sound suppression in the way (middle baffle removed), you can definitely hear a lot more engine activity through the exhaust system, wouldn't you be able to hear the 'dump' of gas with a modified exhaust?

General question - There is only one wastegate on the primary turbo, none on the secondary, or did I get my facts wrong when reading something in the past?

My understanding is (and I'm happy to be corrected) that both turboes are vacuum controlled waste-gate units.

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Originally Posted by Celtoid

I was originally concerned about just taking the car to any exhaust place but definitely wasn't going to take it to LR, as they would charge an arm and a leg. So I went to MR Automotive in Redcliffe for advice and they stated that any reputable exhaust place can fit or fabricate a replacement but some folks opt to remove it completely.

They recommended Jack Beedham's Exhaust & Brake Centre, as they use him regularly and he is familiar with LRs, but when I went in it was chaotically busy. A few days after that visit I happened to be talking to a friend who stated that she grew up with Rob Bliss, who has an exhaust place at Geebung. He was super busy too ..... COVID Cash .... go figure [bigrolf] .... but fitted me in. Rob repeated MR's words and stated that lots of guys get the baffle removed even when serviceable, just to get a bit more exhaust sound. I like how quiet the D4 is but also didn't mind the thought of a bit of growl. ~$200 sealed the deal, Vs close to a $K I imagine, for something else to be fitted or fabricated. He literally just cut off the baffle and stuck a straight section in it's place, leaving the tailpipe mufflers in place. Nothing special.

It is quite a different sound and I think the car is running a bit better, which I was told may occur as the engine will breathe better. I could be imagining things though ... LOL!!!

You do hear a lot of waste gate action and gear changes .... especially as the 8 speed changes so often. The car has a definite rumble sound now :-).

...... and apparently you can hear the secondary turbo .... [biggrin]

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Do/did they just weld a section in or flange each end?

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Originally Posted by Dagilmo

Do/did they just weld a section in or flange each end?

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They just welded a Y shaped pipe in place which joined the two existing tailpipes with mufflers to the straight section that comes from the engine end.