nicholas9976

I saw there was a very simple modification to the air intake of 997.1 Carreras that gave an awesome (to my ears) racecar-like sound. Basically they just blocked the Helmholtz resonator which muffled the intake noise especially at certain sound frequencies, and for added points put in a high-flow aftermarket intake filter. The Fabspeed Cold Air Upgrade Kit was one product that did this:
http://www.fabspeed.com/porsche-997-...r-upgrade-kit/

You can hear the sound this modification produced for 997.1 cars in these videos:
(skip to 4:00 minute mark for the engine sound)
(skip to 4:40 mark for the engine sound & discussion)

My question is whether there is an air intake upgrade or hack that will deliver a similar engine sound for the 997.2 Carrera S?

JCD911S

Get rid of the airbox and get an open intake system with cone filters. That'll make the intake more audible.

nicholas9976

Has anyone done this (removed airbox & changed to cone filters) to the 997.2, and did it make a significant difference/improvement to sound like in the 997.1 videos above?

I saw the engine diagram in the brochure for the 997.2 has a "resonator". Will blocking this improve sound like blocking the Helmholtz resonator did on the 997.1 ?

Tj40

There are a bunch of threads on replacement intake systems - most manufacturers market them as cold air intakes - a lot of people here point out that they probably just suck more hot air from the engine bay.

Increasing the intake noise is probably the least contentious claim these systems bring! As with anything whether you like it or think it's worth the money is down to your personal opinions.

There was one good thread if you do a search where an owner recorded the MAF readings off the ODBII port and showed that airflow did increase under certain conditions I believe for the fabspeed system. People claim more induction noise but I don't think there are any greater video clips demonstrating this effect - as with exhaust mods a video clip is not nessesarily the best guide on judging these things.

nicholas9976

For the MAF readings thread, I assume you are referring to this one:
https://rennlist.com/forums/997-foru...surements.html

Maybe I can ask that poster ( gasongasoff ) what effect the mod had on sound.

gasongasoff

That's me. Definitely a much louder noise from about 5000 or so up til redline. I really like it, personally. Below 5000 rpm, the CAI might add a bit of volume, but right when you hit about 5000 rpm it probably doubles in volume.

I think the only effective sound mods to the 997.2 airbox involve replacing the bottom cutouts with a mesh screen (if your vehicle doesn't already come with it) and/or just removing the top cover (although I don't think that's a great idea for a number of reasons). I did try placing the bypass valve on permanent vacuum by bypassing the vacuum solenoid, but it didn't seem to make that big of difference in sound.

Someone posted a youtube clip of a 997.2 with just the fabspeed CAI driving through the canyons. Perhaps someone knows what I'm talking about and can post it.

In terms of CAI actually being a hot air intake - according to my measurements, this is true when your vehicle is travelling less than about 50 mph or so, or if it's stop and go. When you're at freeway speeds continuously, it's just as good as the OEM airbox.

nicholas9976

Hi Gasongasoff, many thanks for your nice reply. I have been searching Youtube but only found 997.1 videos or ones with the exhaust replaced as well. Would love to see that 997.2 with CAI going through the canyons video if someone can post a link to it?

To clarify, is the CAI you used this one: http://www.fabspeed.com/porsche-997-...intake-system/
It's the only one Fabspeed seem to sell at the moment?

BTW, do you think I would get an approximation of the CAI sound if I took off the airbox top cover just for a very quick test to see if I like the sound? (including together with my Porsche Sports Exhaust when activated by button).

Was the sound similar to what you hear in the second video I posted above at the 4:40 mark?

I just fell in love with that RRRAAAAAAA sound that builds to a redline gear-change climax.... love it.

JCD911S

Here's a 997.2 with the intake in question. Listen and see if it's what you're looking for.

Own Goal

^ I have as above with the stainless version plus PSE with the Sharkwerks X. It screams. Inside the car above 5000 makes some sweet noise.

Redhot2474

I have a 997.2 with a fabspeed intake, definitely changed the sound - Especially from 5k on - I just also added gundo , the 2 combined definitely give an interesting sound ....

mk85911

When I test drove a 2010 997.2 C2 I loved the induction sound. I subsequently purchased a 2011 997.2 C2 and I thought the induction sound was a little subdued vs the 2010. The dealer parts department compared the intake systems for both years, and claimed they were identical.

Several months passed between my test drive and the arrival of my 997, so I certainly could be mistaken re the perceived difference in induction note, plus I was more conscious of break in RPM on my car. But there is another difference between the two cars, to wit, the 2010 had the stock radio, whereas my 2011 was ordered with the Bose system which seems to have more equipment located between the engine bay and the rear seat, and I suspect that may cause some attenuation of the induction noise. Just my theory.

Anyway, the induction noise is still pretty darn good, and I ordered PSE on my 997.2, so I've got a sound I'm extremely happy with. And the radio sounds good. Mike

phaphaphooey

I am quite pleased with the increased sound on my carbon fiber fabspeed unit for my 997.2. It really howls above 5k or so as others have said but there is also a much more throatier sound at lower rpms with large throttle openings and even a metallic hissing sound of the air going past the throttle plate in the throttle body at a smaller throttle opening when the throttle plate is just barely open. If you like mechanical noises (which I assume most people on this board do) it is a welcome upgrade as the .2 in stock guise is much too quiet, both on the intake side and the exhaust side.

However, I will say that while it is too quiet, the OEM airbox on the .2 is very well engineered and world's better than the .1 intake air box.

gasongasoff

I think the 2nd video you linked in your original post is the one I'm thinking of.

Yep, that's it.

Possibly. There's still some noise cancellation even with the cover off, though, but worth a shot.

Yes, very similar, but it's hard to tell because I'm listening to it on lousy speakers.

John@Fabspeed

Thanks to those who chimed in with some feedback on our intake for Nicholas

Our Competition Intakes for the 996-997.2 Carreras have consistently been one of our most popular products. The build of engine sound as you crest into the higher RPMs is intoxicating, and one of the best bang for the buck enhancements to the driving experience. Nicholas i'm quite confident it will exceed your expectations

nicholas9976

Hi John, many thanks for your reply, will contact Fabspeed to place an order in the near future.
I noticed that you offered a CAI for the 997.1 that also had a cap to seal off the Helmholtz resonator (sealing it off increased the intake sound significantly). I believe a number of other suppliers produced 997.1 resonator caps as well, but I haven't found any 997.2 resonator caps so far. I am wondering why your 997.2 product doesn't have such a cap? I noticed an item labelled "resonator" on the engine diagram in the 997.2 PDF brochure on the Porsche website. I am wondering if you may know whether sealing this is possible and if so will it increase the intake sound?
Thanks.