Jump to content

Welcome to RennTech.org Community, Guest

There are many great features available to you once you register at RennTech.org
You are free to view posts here, but you must log in to reply to existing posts, or to start your own new topic. Like most online communities, there are costs involved to maintain a site like this - so we encourage our members to donate. All donations go to the costs operating and maintaining this site. We prefer that guests take part in our community and we offer a lot in return to those willing to join our corner of the Porsche world. This site is 99 percent member supported (less than 1 percent comes from advertising) - so please consider an annual donation to keep this site running.

Here are some of the features available - once you register at RennTech.org

  • View Classified Ads
  • DIY Tutorials
  • Porsche TSB Listings (limited)
  • VIN Decoder
  • Special Offers
  • OBD II P-Codes
  • Paint Codes
  • Registry
  • Videos System
  • View Reviews
  • and get rid of this welcome message

It takes just a few minutes to register, and it's FREE

Contributing Members also get these additional benefits:
(you become a Contributing Member by donating money to the operation of this site)

  • No ads - advertisements are removed
  • Access the Contributors Only Forum
  • Contributing Members Only Downloads
  • Send attachments with PMs
  • All image/file storage limits are substantially increased for all Contributing Members
  • Option Codes Lookup
  • VIN Option Lookups (limited)

Engine Whine Noise


Recommended Posts

First of all, I am new to this Board and it is very impressive. Great advice and knowledgeable members!

I recently purchased (third owner) a MY00 C4 Cab with 12k miles 6 speed. The previous owner (second) installed a Fabspeed Muffler and Headers along with a piggy back computer to max out horsepower and drove the car about 6k in just over two years. The car was loaded with options that brought the MSRP to nearly 102k and it was in showroom condiiton. It's a real beauty and I'm excited to own it.

Now that I am driving the car, I notice a continuous high pitched whine that varies with RPM. Almost sounds like a supercharger (but it doesn't have one). The pitch of the whine goes up with the RPM.

Someone mentioned that all Porsches have this characteristic but usually at redline.

Anyone have thoughts on what it might be? Is this normal?

I'd like to bring it in to the dealer with some info behind me if I can.

Many thanks,

Bob :drive:

Link to comment
Share on other sites

Congrats on the acquisition!

As for the whine - our 2004 996 40th displays a similar sound/whine, rising & falling with rpm's. Go to your/a dealer and test drive a car to get another reference point. I am sure you will hear the same sound........maybe the Fabspeed exhaust set up accentuates it somewhat...........

Link to comment
Share on other sites

Well it looks like I do have a normal condition going here. I checked the air filter and it is a K & N. Should I change it back to OEM to lessen the noise?

ALthough the Fabspeed muffler has a lot going for it... It is just too loud for my taste.

Should I consider going back to the OEM mufflers as well?

Thanks guys for your quick response!

Link to comment
Share on other sites

There are many opinions on the K&N style filter (oiled cotton) vs. the OEM paper element. Various papers have been written that the oiled cotton style allows a greater proportion of super fine grit to pass through the filter, as opposed to the OEM paper elements which seem to do a better job dealing with this fine grit. As for total airflow - one would have to assume that the factory did the job right with filter sizing and paper specification - which would ensure air flow that is more than adequate. Oiled cotton filters do seem to allow a little more induction noise on acceleration - and people in general seem to like that.

Oiled cotton is also able to impact the MAF sensor operation - and can cause CEL events if the cotton is over-oiled.

As for the mufflers - you may want to leave the headers installed, and opt for the Porsche Sports exhaust, which offers some noise modulation if the control system is installed. If you don't want to go to that trouble and expense, then the stock pressed shell mufflers could be the answer. Dansk is a company that also offers OEM style pressed shell mufflers - and if you do your research, the price may be better than OEM factory spares. Of course, there may be some people on this forum who would sell you their stock mufflers.

Link to comment
Share on other sites

Thanks for your advice. 

I am going to opt back to stock mufflers and will leave the headers where they are as you have suggested.

Haven't quite decided on the filter but leaning toward OEM as well.

I have an 04 C4S with under 3K (car was first registered in 5/05). I have the PSE on order, so I will have a low milage set of OEM mufflers. I can't guarantee exactly when they will be available, but it should be in the next few weeks. Also, I don't know if they will fit your car, but I am sure that others here will know. PM me if you are interested.

Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

×
×
  • Create New...

Important Information

We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue.