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)
911rs

spark plugs for 964 C4 3.8 mod 89

Recommended Posts

hi,

I´ve the following modifications:

3.8 engine forged pistons 11:4

perfect bore 102 cilinders

rs cams

titan valve retainers

special valve springs

cup pipe

no cat

dme remap

95 oct gas

Bosch FR5DTC spark plugs!!

the engine runs realy B) :) .

I would like to know if you could recomand me another typ of spark plugs for better performance?

thnx in advance

911rs

Share this post


Link to post
Share on other sites
    You can remove these ads by becoming a Contributing Member.

If it's running fine and the plugs have a good colour then why look for something different?

Share this post


Link to post
Share on other sites

your right.

but I´m looking for better type of plugs for example platinum! actualy have bosch FR5DTC for stock engine.

any idea?

regards

911rs

Share this post


Link to post
Share on other sites

Hello

first you should contact the engine builder and ask them for there advice. The 3,8L Conversion was done by the factory and some tuners as well. However while they mostly used the same hardware they can have different CC Ratios in the Head and therefore different Compression Ratios. While the Knock detection will prevent missfire it will not detect a hot spotet Spark plug melting down into the engine.

Bosch is a good brand but i prefer the more trouble free NGK (BCPR7ET/BCP7ET), Champion (RC7YCC) or Beru (14FR5DTU) Brand.

If there is any trouble with the ignition you can try to use Bosch F5DTC without surpression Resistor.

The F5DTC works better under lean conditions and seems not to foul as fast under oil in the combustion.

Both are issues with old & worn engines but mostly the NGK oder Beru work with resistor as well and they are much cheaper to have.

While Porsche intruduced the 993 they swaped to FR6DP Plugs for extended Service life but soon replaced them with FR6LDC from the 993TT.

For extended Service live the NGK BCP7ET worked very well on stock engines and will fire much leaner mixtures then the stock spark plug. However Porsche Factory Service don´t recommend the 3 or 4 Tip Plugs as as the spark will not ignite on the correct spot wich translates into retarded ignition and less peak power.

Porsches don´t likes the Brisk as they seem to have much shorter service life the the maintenance scedule and they tend to "stick" in the head risking expensive treat repair however mostly you also find someone greased the plugs at the last installation.

Grüsse

Share this post


Link to post
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.