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Registered
Join Date: Jan 2002
Posts: 4
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Cat Conversion on 3.2
Does anyone have any experience installing a catalytic converter onto a non-cat 911? My '89 3.2 won't pass it's next emissions test (in Switzerland) & it would be a shame to part with a car that has only 50k miles on it. Is it just a matter or buying the parts (cat + gaskets less than $500 from Pelican) and having them installed or is there more that I am missing? Any suggestions are much appreciated. Thanks Dbchob
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02-08-2003, 01:36 AM
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911 user
Join Date: Sep 2001
Location: East of Eden, West of the Sun
Posts: 2,411
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I am anything but an expert however, my understanding is:
The original cat equipped models had a lower compression ratio. This was to do with the non availability of higher octane unleaded fuel rather than any technical issue. As 98 octane unleaded is freely available in Switzerland this is not an issue for you. O2 sensor on exhaust feeding to dme. I do not think this is critical to your needs, it would depend on what exactly is tested and checked. The dme may need a new chip because of changes such as the cat and/or 02 sensor. You may also need a sound panel under the car if they test for noise levels. I also have a vague idea that Swiss spec cars had an air pump similar to the SC. You may also need that if they are checking for original fitments. How come your car is in this situation - recent import?
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Where once the giants walked now Mickey Mouse is king. My other car is also a Porsche. |
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02-08-2003, 02:19 AM
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If you understand German make sure to search the archives at www.elfertreff.de
It's a fantastic site - loads of Porsche info. Search for "Kat nachrüstung" "Cargraphic Kat" "Lenz" Also visit www.netmotor.de (kat leistungs kit) |
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02-08-2003, 02:57 AM
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Alter Ego Racing
Join Date: May 2002
Location: Florida
Posts: 5,553
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Hopefully this helps, I had to install a cat on my 78 (with an 87 3.2) and what we did was to cut the headers, install flanges and used replacement cats from a Mazda Miata (One on either side). Install looks clean and have not had any problems.
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International GT Champion; Porsche GT3 Cup Trophy Champion; Klub Sport Challenge Champion; Rolex Vintage Endurance Series Champion; PCA Club Racing Champion; National Vintage Racing Champion |
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02-08-2003, 07:21 AM
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911 user
Join Date: Sep 2001
Location: East of Eden, West of the Sun
Posts: 2,411
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How much power did it feel you lost with the Miata cats and how did it do on emissions tests?
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Where once the giants walked now Mickey Mouse is king. My other car is also a Porsche. |
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02-08-2003, 08:48 AM
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Alter Ego Racing
Join Date: May 2002
Location: Florida
Posts: 5,553
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It does feel like I lost any power, actually low end feels stronger. Noise levels are way down (I have SSI's and a B&B single outlet).
Emissions past way OK even with a modified chip. I can try to take some pics if interested. By the way, I used replacement cats from Pep Boys (very inexpensive!) and assumed that since I'm plumbing 1.6 liters to each side and the cats are for a 1.8-2 liter engine it would work OK. Not too scientific but results are good. Juan
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International GT Champion; Porsche GT3 Cup Trophy Champion; Klub Sport Challenge Champion; Rolex Vintage Endurance Series Champion; PCA Club Racing Champion; National Vintage Racing Champion |
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02-08-2003, 03:07 PM
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911 user
Join Date: Sep 2001
Location: East of Eden, West of the Sun
Posts: 2,411
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I would love to see some pictures and any details on the conversion.
It seems as if the Green emissions Goblins are going to get their way in Italy and within a year or so it won't be possible to take a non cat car into many cities during business hours. I was playing with the idea of getting a utility car or fitting an oe system if it came to pass, but fitting a couple of cats as you did seems a much more fun option as well as being a lot cheaper. I found this whilst netsurfing. I don't know how viable it is. http://www.hydrodrive.8k.com/webnews.htm http://www.hydrodrive.8k.com/PRESS%20RELEASE1.htm
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Where once the giants walked now Mickey Mouse is king. My other car is also a Porsche. Last edited by Milu; 02-09-2003 at 05:23 AM.. |
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02-09-2003, 03:29 AM
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Registered
Join Date: Jan 2003
Location: Dublin, CA
Posts: 6,276
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Since 1987, Porsche had only two two major 3.2 engine types for the Carreras. But the engines had different "solutions" for certain market conditions, resulting in four 911 Carrera engine variations.
The Type 930/20 engine, without catalyst, developed 231 hp for Germany and RoW markets. Type 930/25, with catalyst, produced 217 hp for the United States, Austria, Switzerland and Japan. Australia has a different unit, also labeled 930/21 but with 207 hp, while Sweden got Type 930/26 with 231 hp with no catalyst. Each version required a corresponding DME control unit, all kept on hand at the Stuttgart-Zuffenhausen assembly line for installation as needed. If your car was originally made for your country and no changes were make to it, you can assume that the engine and DME are matched for your country. Check for a sticker, probably on the driver's door jam, that indicates what market the car was made for. I would suspect that your oxy sensor may be the cause of the higher emissions. If they go bad, they have a significant impact upon both emissions and driveability. They are fairly economic to buy and easy to install. I would start there. A cat should last more than 50K miles unless leaded gas was used in which case a cat would give up its life very quickly. Good luck and let us know what you determine to be the cause of your car's higher emissions. Thanks
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Sergio The GT Lid Whisperer PCA 42yrs - National DE Instructor / Ex-RGruppe #197 '19 718 Cayman S (9th Porsche/1st with PDK) '14 Subaru Forester XT (Porsche support vehicle) |
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02-09-2003, 06:58 AM
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The Cuddly One
Join Date: Nov 2002
Location: Milan, Italy
Posts: 1,515
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Quote:
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-Isa 911E 3.0 (Tristezza, the Rattus Maximus) and Jimmy the Mini lll Dum vivimus, vivamus! Man braucht nicht reparieren was funktioniert! |
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02-09-2003, 07:30 AM
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Registered
Join Date: Oct 2002
Posts: 6
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Check out the Lenz PowerKat System for the C1, approved
by the TUV in Germany, with a performance increase to 240 - 260 HP. www.lenzmotorentechnikusa.com regards John
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volle Kanone 1987 3.2 Carrera 1978 3.0 Ruf SC 1976 3.0 Carrera - sold 1972 2.4 911 S - sold 1972 2.4 911 T - sold |
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02-09-2003, 10:42 AM
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911 user
Join Date: Sep 2001
Location: East of Eden, West of the Sun
Posts: 2,411
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John Desmond:
Very interesting conversions, esp the Ultra. HP results seem very high (80hp over Euro standard) for camshafts and external mods only. I'm looking forward to learning more on this conversion. Dbchob: Are you still with us? Isa: Facetious technical comments from some one who only mastered the coffee machine last week? 
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Where once the giants walked now Mickey Mouse is king. My other car is also a Porsche. |
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02-10-2003, 08:55 AM
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Registered
Join Date: Jan 2002
Posts: 4
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Everyone, thanks for the great input. I have been following up on most of it to see where it can take me. For background, my car is a 930/20 engine without cat (tx Sergio) that I brought into the UK 4 years ago.
Now I'm trying to take it into Switzerland (an '87 Cabrio with only 50k miles would be a shame to part with) but it would need a cat - Swiss regulations. I followed up on the Lenz Powerkat suggestion (tx John) which sounds good in terms of performance, but at a cost of $3k ($4.6k to get to 260HP), it's a bit steep. So I am still looking for other options. I have calls into two London Porsche centers for estimates on what the conversion will cost. I'll keep my fingers crossed and I'll post updates. If anyone has any other suggestions or cheaper routes, I'd appreciate them. TX DB |
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02-14-2003, 07:39 AM
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