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Registered
Join Date: Dec 2014
Posts: 13,823
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Bosch CIS Help
I have a 1980 sc and the CIS is toast. I have a 1981 CIS to replace it.Am I going to run into problems with the addition of the temp switch and additional throttle position switch? Do I have to have these hooked up to run properly on my 1980 motor??
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02-23-2015, 03:48 PM
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grateful user
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It will work.
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fully disassembled, blasted, customized and restored 75 targa with factory hard top, 993 style turbo ft fenders, steel flares, C2 bumpers and rockers, 82 3.0 sc 9.5/1 engine with PMS flywheel, 964 cams, flowed heads, ssi's short geared 915 w/lsd, polybronze, bilstein,working lambda, modified and highly tuned cis, tensioners, pop valve, backdated exhaust and heater, 2300 lbs. no bolt left untouched. 1970 911E. Nice car but needs a re-do. |
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02-23-2015, 04:13 PM
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El Duderino
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Is the temp switch you're referring to the 15°C switch? If so, the ECU uses that as part of the cold start enrichment equation. You might be able to just ground it. I'd have to go back and look up the behavior.
Not sure on the TPS I know there are some differences in K-Jetronic from year to year -- some are more significant than others -- but I can't remember what they were. Have you looked at Jim Williams' CIS website yet? Edit: This should help with some of the differences. Check out the bottom of the page. Does your '80 have a spot in the case for the 15°C switch? It's usually right under where the A/C compressor mounts about the tensioner housing. Also the PIN outs on the wiring harness appears to be different. Dennis (timmy2) might be able to help you there. 911 CIS Primer - CIS Lambda Last edited by tirwin; 02-23-2015 at 04:23 PM.. |
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02-23-2015, 04:16 PM
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Registered
Join Date: Dec 2014
Posts: 13,823
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Its the additional 15 degree tps switch and the temperature switch they added in 81. Could someone send a link to Jim Williams site? Thanks
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02-23-2015, 04:56 PM
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75 Porsche 911
bike
1970 porsche E
1983 Porsche 911SC Coupe
2011 Mercedes-Benz E350 Cabriolet
