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It certainly is. Does that airbox have a Helmholz resonator in it?
The .2 does not have the Helmolz resonator like the .1 cars, but the S (not sure of the base) does have a flap activated by vacuum. See my video below on how it works.
The one thing I never could check, was the functioning of the internal flap (vacuum actuated) deep inside and at the forward-side of the intake plenum. This penum flap is unique to the S and absent on the base model and I wondered if mine was sticky or slow to operate.
I have a standard air intake with factory filters... completely stock.
It certainly is. Does that airbox have a Helmholz resonator in it?
I don't know...I've never inspected it too closely other than removing the cover to change out the filters - this is all one sees after removing the pretty carbon:
I don't know...I've never inspected it too closely other than removing the cover to change out the filters - this is all one sees after removing the pretty carbon:
This part of it is interesting and seems like what's on the non X51 airbox so looks like it may
The Fabspeed intake does not require connecting the vacuum line.
None of the CAIs do. That's why I'm wondering if anyone with this issue has ever tried a CAI to see if it has any effect, even as an experiment. If it does it with a CAI installed too, then it's likely variocam related. If it doesn't, then it's likely something related to the way the air is going through the airbox and the resonator at that specific rpm.
Warning to stock airbox users, if you don't want a CAI for whatever reason, don't be the one to do the test as the increased throttle response and sound may have you never go back
Wow, that is interesting. The X51 option has a different air box than my S. I see on RacerWannabe's air intake, he has the same vacuum solenoid valve on the right side of the box... and it appears the system is the same (maybe) but the tunneling is definitely different. Going for a slightly different tone using the same guts?
The Porsche documentation is pretty explicit that this flap system in the air box is for aesthetics only... they don't hide this fact.
Mr P, you got good eyes!
Peace
Bruce in Philly (now Atlanta)
Last edited by Bruce In Philly; 08-12-2021 at 04:57 PM.
None of the CAIs do. That's why I'm wondering if anyone with this issue has ever tried a CAI to see if it has any effect, even as an experiment. If it does it with a CAI installed too, then it's likely variocam related. If it doesn't, then it's likely something related to the way the air is going through the airbox and the resonator at that specific rpm.
Warning to stock airbox users, if you don't want a CAI for whatever reason, don't be the one to do the test as the increased throttle response and sound may have you never go back
When I installed the fabspeed intake I called them and asked about the vacuum connection they told me I didn’t need it. I’ve gone back and forth between the stock box and fabspeed several times and haven’t noticed any difference other than the sound. I’m currently running stock with BMC filters.
My hesitation is still there... been there for 150K miles of ownership. In the beginning of my ownership, at 23K miles, I spent a few years on and off trying to figure it out.. …
I am convinced it is the low-high transition of valves. Why some of us have the hesitation and others don't? I dunno.
Count me as another nettled by this ~2800rpm bog
2010 CS, MT, 43Kmi
Got the car April 3 of this year, at first *thiught* I noticed it, then increasingly *sure* I noticed it, but was too busy focusing on other new-to-me noises/sensations to prioritize this little bog down
But focused on it today, returning on a ~100mi Hill Country run. Mentally collected my bullets for searching/posing here.
Got home, searched, found this thread, relieved to learn it’s not a signal of anything.
Guess that means I have to turn instead towards this other thing nettling me (what seems to be at times an overly boggy launch in first gear).
Wow. Me too. '09 C4S, 6MT, 48K miles. Thought it was just my car, been running Techron and thinking it made it a little better. Likely just placebo effect. It is a little annoying. Although, I can sleep better knowing I'm not the only one troubled by it.
08-12-2021, 11:20 AM
