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Old 12-11-2015, 11:13 AM   #1
ac427
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Arrow Flap or no flap - Does it effect performance ?

Aplolgies if this has been covered before but....

Lots of non CSL owners keeping banging on about the CSL snorkel flap and low down torque.

I know loads of you guys remove the flap because it can be a bit problematic.

Is the flap just for noise reduction or does it actually help low down torque?

Have you guys noticed any real difference with and without the flap?
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Old 12-11-2015, 01:11 PM   #2
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I find my car runs better with the flap on and working. Without it it seems to lack low down torque and I experience the odd bout of jerkiness from the engine. Situations where I'd notice it the most were for example; slowly turning off a junction onto a steep hill in say second gear.
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Old 12-11-2015, 02:24 PM   #3
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Flap on flap off no difference in performance but a bit easier to drive cold

Broken flap 0-30 bhp less.
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Old 12-11-2015, 02:41 PM   #4
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Quote:
Originally Posted by shimmy View Post
Flap on flap off no difference in performance but a bit easier to drive cold

Broken flap 0-30 bhp less.
Ta Shim, So it's easier to drive when warming up the engine or when the air temp is low ?
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Old 12-11-2015, 03:04 PM   #5
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It is a little more jerky to drive when its cold.. but i think once its warmed up there is no real difference. But you get a deep growl below 3000RPM when you push the noise pedal... i love it


The flap's main job is to reduce noise emissions.
When you read your DME with tool32, it even is called "Geräuschklappe" which literally translates to "noise flap".
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Old 12-11-2015, 04:00 PM   #6
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It may be called the "noise flap", but I believe it is also used to tune the intake volume to regulate the intake air speed for driveability at low rpm speeds (hence why it is reported that below a certain rpm, flapless (oh er ) it creates hesitations at certain rpms / throttle sweeps as the change in air speed is too great for the ECU to regulate / deal with.
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