1979 928 Catalytic Converter and Oxygen Sensor Question
 

I sent my '79 928 to SouthAmerica for "future enjoyment". Before the car was shipped, the local dealer here in Canada suggested that "at least" one of the cat converters will need to be changed soon. Since in m country there are no emission regulations for a car this old, I was thinking in removing ALL the converters and replacing them with a sport custom madeexhaust, would this change help the car's performance?...what about the oxigen sensor?
Your opinion will be appreciated.
Many thanks.

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A professionally engineered exhaust without catalytic converters will increase performance. You may find a decrease in throttle response at lower RPM, but you'll pick up some power at higher RPM. As for the oxygen sensor, I would keep the sensor in the loop. Reason being when you are cruising the sensor will be mindful of the air fuel ratio saving fuel, when you mash the throttle to wide open, the DME (engine control module) ignores the oxygen sensor and the fuel mixture goes to a rich mixture which Porsche engineers have determined works better for producing power. So removing the sensor will not increase performance. Remember that you'll be driving a car with no catalytic converters, should you choose to remove them, and the exhaust fumes will be dramatically increased.

- Casey

Good input, Casey.

CIS Kjet on the '79 doesn't have an O2 sensor. :)

Specs on all that MY

77-79 - 3-auto (US) 4.5L-16v M28/04 219 245 8.5:1 K-Jetronic 140 8.5 16 3373
77-79 - 5-man (US) 4.5L-16v M28/03 219 245 8.5:1 K-Jetronic 143 7.5 15.5 3285
77-79 - 3-auto (Euro) 4.5L-16v M28/02 229 250 8.5:1 K-Jetronic 140 8 16 3197
77-79 - 5-man (Euro) 4.5L-16v M28/01 229 250 8.5:1 K-Jetronic 143 6.8 15.5 3197

Porsche 928 Forums dot com - View topic - 928 Engine Types & Performance Data

Sounds like your local dealer is taking you for a "ride." ;)