Air box sound reduction trumpet removal (My experience)...

[RipGroove]

So got bored today and removed the trumpet and blocked the vac pipe. Engine completely standard otherwise. I can definatley confirm a noise increase lower down the revs (engine sounds very nice now I can actually hear it), can't feel any gain in performance (as expected) but more importantly haven't felt a drop either, no engine light either so I'll definatley be leaving it off.

As far as I can see its sucking in no more hot air than it does with the trumpet in place.

 

[TomsF1]

iv only picked my car up on saterday and have looking at that thinking what the hell is that there for?? can u shed light please? lol

 

[RipGroove]

iv only picked my car up on saterday and have looking at that thinking what the hell is that there for?? can u shed light please? lol

Have a search on the forum, seems its there to reduce noise at low revs, it stays closed at low rpms and opens up at higher rpms. I personally dont see the harm having it open all the time.

 

[walkie86]

Did you remove the acoustic valve (plastic butterfly contraption at the end of the secondary intake hose) or the noise-reduction tube under the battery that connects to the main intake pipe?

 

[RipGroove]

Did you remove the acoustic valve (plastic butterfly contraption at the end of the secondary intake hose) or the noise-reduction tube under the battery that connects to the main intake pipe?

I removed the acoustic valve.

 

[walkie86]

Sweet. I just removed mine.

My seat-of-the-pants dyno showed a slight increase in low down torque

 

[syston1988]

could someone post a pic of what to remove please?? Thanks

 

[Ollie RS]

+1 for me please ^^^^^

 

[RipGroove]

Remove the trumpet that was here, and block the vac pipe that's left...



All it takes is a 10mm socket and something to block the vac pipe with (I used a 4mm steel dowl pin)

Will be adding a cold air feed to mine down to the front somewhere.

 

[walkie86]

I removed the vac pipe with the acoustic valve and just screwed a small self tapper into the tube the rubber vac pipe attaches too. Looks neater with no vac pipe dangling off.