I have just installed a cold air induction kit on my mk2 vrs. The engine now revs more freely and I can feel it is more urgent. I have noticed however that when i lift off the throttle it sounds as if it has a dump valve. Is this a normal sound or is there something wrong?

On 07/07/2018 at 12:41, Braffmsc said:

I have just installed a cold air induction kit on my mk2 vrs. The engine now revs more freely and I can feel it is more urgent. I have noticed however that when i lift off the throttle it sounds as if it has a dump valve. Is this a normal sound or is there something wrong?

I have a K&N cold air induction kit and had run it with the cover off on my Octavia Mk2 FL VRS TDI.  The whooshing noise under acceleration is loud and sounds sporty.  However, when you suddenly lift off the throttle you hear that noise that sounds like a dump valve and is normal.  It's more evident when accelerating in a high gear, like 5th, then lift off the throttle....

 

I've now got the cover put back on and have the original air scoop modified so that it diverts more air into the connected hose intake to the box and works well.

Thanks for the information