Reply With QuoteSome kind of catalyst warm up cycle. But from what I have read it is just running richer which wouldn't account for the sound change also...
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Volkswagen Enthusiast
Hi Guys,
When my R is cold and idling, it sounds very loud, I actually quite like the sound (I suppose you could say it sounds raw). But then after it begins to heat up it becomes much quieter, I'd like to know what causes this?
I know it's not the flap in the exhaust, since I originally thought it was and I've disconnected the vacuum hose going to it.
Any ideas??
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2020 VW Golf R
Volkswagen Enthusiast
Some kind of catalyst warm up cycle. But from what I have read it is just running richer which wouldn't account for the sound change also...
Sent from my GT-N7105 using Tapatalk 4 Beta
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Manual MY12 RB Golf R | Bluefin Stg2 | Milltek turbo-back
New Dubber
My tsi does this, I just assumed it was the waste gate staying open while the cars rrvs are up when cold
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Volkswagenist
Call normal mine does it sounds almost diesel. Worse in winter
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Current Ride: MY 16 Daytona Pearl Grey Audi S3- Performance Pack 1, Sunroof and Driver assist
Super Moderator
VWwA Super Moderator
See my post on the other forum.
Volkswagen Fan
I've noticed that from cold the ECU map for warm-up it will raise the idle (you might notice on the rpm gauge) and enrich the fuel (you can smell it). This puts the engine RPM at an acoustic sweet spot which makes it sound boomy. Remembering also there's that stupid sound actuator mirroring the engine rpm. The combined effect is the boomy sound you hear. You can use your foot and raise the idle to the same level and get the same effect.
/10c
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