I am a super satisfied 991.1 TTS 2015 owner overall. I have been embattled with my local Porsche dealership and Porsche Australia about a ' hissing' whistly noise that comes from everytime deceleration below 2200 rpm. It's sort of an annoying hisss Similar to a sort of prolonged hiss you hear when a Commercial passenger Bus or a long wheel 16 wheeler truck would create as it decelerates to come to a halt next to you or when a bus pulls into a bus stop.
Porsche claimed that it's a standard stock sound / noise which all TTS make from the "pop up" valves. They even sent the digital recordings of the sound to Porsche Germany and sent me the official response that it's normal.
My dilemma is that is it true or is it Fake news ? ? Do all you TTS brethren eXperience it ? If so, Is it me or does anyone agree that's it's annoying as it's always there and reminds you of a truck pulling over ? If not, any advice or comment would make me eternally grateful ?
I simply am struggling to accept that a world class supercar will allow for pop up valve noises to be a permenannt feature ?
Please help guys ?
Ashar

 

I don't have that problem with my 2014TTS.

Jeff

 

While mine's a .2, from the description it doesn't ring a bell. Mind posting the video?

 

Guys thanks so much .
I will and I might just post the Porsche Australia and Germany response here. Could a few more perhaps 10 memebers verify no hissing sound from pop up valves when coming down from 2000 rpm please ?
So guy it's all smooth engine sound no artefacts or noise from you ?
Can I please have 10 plus affirmations from here so I can attach it to my letter of challenge to Porsche Australia ?.
Is there. Tech guru on 991 tts here who can also verify/ please ?
Thanks a million guys

 

My car has always had that sound. It's just part of the experience 21k trouble free miles in 2 years. Coast to coast rallies. Half mile and quarter mile races. Tracking at COTA. You name it.

 

sdg1871 thanks so much . Now that's part relief part more confusing . So you're absolutely sure it's normal ? You reckon it's. a TTS sound or would you know it's also on 991 turbos ? Like our friend with the 991.2 above can anyone shed some light whether Porsche eradicated this hiss in the .2 engine ?

 

Yes I believe it's normal it has something to do with the diverter valves but I'm sure technical experts on here like Sam or Tom could explain. I love the sound.