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Join Date: Sep 2005
Location: new jersey
Posts: 187
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question about catalytic
I'm in the process of deciding on engine upgrades. A stage 1 approach,bolt on stuff. Turbo, headers and intercooler for my 1988 930 turbo cab.
The question is: What about the catalytic converter? If I do the upgrades, can I keep a cat in place or do I have to forgo it? If I can leave it in place, would it defeat the purpose of upgrading the power? Thanks, Q.
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2004 996 TurboS Cab 2005Cayenne Turbo S 1988 930 Turbo Cab 2004 BMW M3 2007 Range Rover Sport |
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02-14-2007, 10:06 PM
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The cat is after the turbo so you can take it off and put it on as needed for inspection.
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2014 Cayman S (track rat w/GT4 suspension) 1979 930 (475 rwhp at 0.95 bar) |
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02-15-2007, 06:03 AM
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Location: new jersey
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I know that. But is it really that bad to leave it or replace it with an aftermarket unit like the one offered by our sponsor? Not to be green (since my Turbo only gets about 11MPG) but, why not, if it's doable?
Q.
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2004 996 TurboS Cab 2005Cayenne Turbo S 1988 930 Turbo Cab 2004 BMW M3 2007 Range Rover Sport |
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02-15-2007, 07:04 AM
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You will be missing out on HP by keeping the cat. Turbos like very little back pressure.
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2014 Cayman S (track rat w/GT4 suspension) 1979 930 (475 rwhp at 0.95 bar) |
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02-15-2007, 08:07 AM
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Join Date: Oct 2006
Location: Mt Pleasant, SC
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I think also, in additon to the loss of performance, and others please correct me if I am wrong, but with your modifications you will most likely need to "fatten" up the CO which is not good for the cat (clog/ burn it up), and if you run the car lean for the cat then you risk damage to yor engine. Also, the cat generates a tremendous amount of heat that I would think you would want to eliminate...
tim
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Tim 1986 930 Gone:71,2,4 914's, 70T, 71T(RS),77S Last edited by timc; 02-15-2007 at 09:38 AM.. |
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02-15-2007, 08:47 AM
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Me like track days
Join Date: Sep 2003
Location: Kirkland, WA
Posts: 10,209
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Having 'been there', I'll give you a heads up to help you.
Fabricate or have someone fabricate a catalyst just like this:   The catalyst adds a very small amount of muffling to the car and is a straight through honeycomb design for minimal backpressure. Do whatever you want to the car for performance. Lean it out for emissions and *stay off the boost* during that time. That's it!
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- Craig 3.4L, SC heads, 964 cams, B&B headers, K27 HF ZC turbo, Ruf IC. WUR & RPM switch, IA fuel head, Zork, G50/50 5 speed. 438 RWHP / 413 RWTQ - "930 is the wild slut you sleep with who tries to kill you every time you "get it on" - Quote by Gabe Movie: 930 on the dyno |
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02-15-2007, 10:07 AM
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Me like track days
Join Date: Sep 2003
Location: Kirkland, WA
Posts: 10,209
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More pictures and visual information. Build your motor & catalyst and go have fun
   
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- Craig 3.4L, SC heads, 964 cams, B&B headers, K27 HF ZC turbo, Ruf IC. WUR & RPM switch, IA fuel head, Zork, G50/50 5 speed. 438 RWHP / 413 RWTQ - "930 is the wild slut you sleep with who tries to kill you every time you "get it on" - Quote by Gabe Movie: 930 on the dyno |
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02-15-2007, 10:10 AM
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1979 Porsche 930 3.4
