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SATINSTEEL1LE · 08-07-2022, 06:05 PM

What you are hearing is what everyone with a ZL1 and rotofab eventually complains about. When you are mildly accelerating, you are hearing the whistling of air going through the bypass valve in the blower. When you give it enough beans where the bypass closes and you start to register boost, thats when it stops.

Completely normal and nothing you can do about it.

Edit - with a closed air intake like the stock one, you wouldn't hear this. So when the rotofab goes on, its introduced. My 18 did it with the rotofab and my 21 does it same with the RF. My buddy's 20 with the rotofab does it as well. I've heard this on at least 5 ZL1s with rotofabs.

08-07-2022, 06:05 PM	#6
SATINSTEEL1LE Account Suspended Drives: 21 ZL1 Join Date: Feb 2022 Location: South East Posts: 662	What you are hearing is what everyone with a ZL1 and rotofab eventually complains about. When you are mildly accelerating, you are hearing the whistling of air going through the bypass valve in the blower. When you give it enough beans where the bypass closes and you start to register boost, thats when it stops. Completely normal and nothing you can do about it. Edit - with a closed air intake like the stock one, you wouldn't hear this. So when the rotofab goes on, its introduced. My 18 did it with the rotofab and my 21 does it same with the RF. My buddy's 20 with the rotofab does it as well. I've heard this on at least 5 ZL1s with rotofabs.