Hello,
12 Turbo S with BMC drop in filter, put on a XXX tune and am getting a whipple type sound when letting off boost in gear. Listen in video below (about 15 seconds in).
Guessing it is time for a new diverter/recirc valve. When i changed the stock units in my 996tt droptop to EVOMS i did hear a little 'whoosh' when building and letting off but this sound from my TTS is different.

TIA!

 

133 views, no replies? yikes

 

Hey! Absolutely your DV's and totally normal. They are the same units you had in the 996TT

 

this whipple sound is normal? wow its crazy sounding

 

You mean whistle right? You are running more boost now so you hear it more. Especially if you added a performance filter.

 

no it sounds like an externally gated big turbo letting off the throttle, not the whoosh sound from my old evoms unit in my otherwise stock 996tt cab, this actually has a whipple sound

if you listen to the video, very closly at about 14 seconds in when i let off the throttle you hear a whipple sound

 

Sam
As always....your the man.

thanks for always getting back

 

Cheers

 

I have that noise as well... had it since i had the car, around 18 months now.. Just had new uprated DV's and it's still there, if anything it's now louder... No idea what it is either though lol...

 

Is your car tuned or so you have a sport filter?

 

When you tune the car, you're pushing a lot more pressure and air flow through the intake tract and diverter valves than there was stock, and it makes a lot more sound--especially with a BMC filter as other Sam said. Based on the video yours are performing properly, no need to replace but we do sell the same valves as your 996TT had for the 997.2TT.

Sam

 

Like the others said, totally normal and totally fine.

But if you want some peace of mind that the diverters are working properly and you won't have issues down the road, they're an easy fix: http://www.championmotorsport.com/pr...p/cmsdv02b.htm

 

Already ordered and being delivered today, installed on monday

 

i am going to try to get a better video, its not a whoosh its a whipple (sounds very electric)

again listen 10-16 seconds in the video closely, its pretty distinct

 

Excellent!

If they're not already pre-installed, make sure you use the yellow springs, since you have a tune.