RS4 B8 Noisey from cold

[Roadrunner01]

Hi All,

I'm new on here and I've had a look but can't seem to find the answer.

When I 1st start my RS it sounds like a bag of bolts for about 20 seconds or so.

Is this normal??

[Thundercliffe81]

Hi All,

I'm new on here and I've had a look but can't seem to find the answer.

When I 1st start my RS it sounds like a bag of bolts for about 20 seconds or so.

Is this normal??

Ha.

You've described the sound perfectly. Yes. Exactly that and it's normal from what I gather.

Are you starting in comfort? Try cycling through to comfort with ignition on then to dynamic or Individual with engine set to loud. THEN start the car. And put the rear seat down haha.


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[Surrey Sam]

The cold start up sequence is louder due to a secondary air injection system. This system pumps additional air into the exhaust stream at the cylinder head to dilute the unburned hydrocarbons created from the cold (inefficient) engine. The now better mixed exhaust gasses can then be catalysed more efficiently by the catalytic convertor in this cold engine state. Once the engine starts warming up, the inefficiency improves to a level where the secondary air injection system is no longer necessary and it stops, the engine idle reduces and the car becomes quieter.

[noddy]

I love it and the its 100% normal, it is actually something that gives the car character lol. If you stand outside an listen you can hear it switch back to normal after 20seconds or so


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[jangol]

I love it and the its 100% normal, it is actually something that gives the car character lol. If you stand outside an listen you can hear it switch back to normal after 20seconds or so


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Likewise, I love that sound also on cold startup, with my JCWeldfab system sounds it roars for a few seconds & wakes the street up embrace it


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[noddy]

I love it and the its 100% normal, it is actually something that gives the car character lol. If you stand outside an listen you can hear it switch back to normal after 20seconds or so


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Likewise, I love that sound also on cold startup, with my JCWeldfab system sounds it roars for a few seconds & wakes the street up embrace it


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It reminds me of an old school dtm v8 on start up, I agree embrace it!


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[Crapsurfer]

Yep. Love it, especially at six in the morning throughout the summer when all my neighbours windows are open, then I drive off in sport.

[jangol]

Yep. Love it, especially at six in the morning throughout the summer when all my neighbours windows are open, then I drive off in sport.

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[Roadrunner01]

Thanks guys,

Very much appreciated