Quote:
Originally Posted by tobluforu
I have a 72 911. Has anyone disconnected the vacuum advance\retard via just plugging the vacuum lines? If so, what does this do over all-idle and high rpm. I run 87 octane, have the timing advanced like crazy and it never pings. If I plug the lines, will I get more advance?
Thanks
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On my 73S if set idle timing to 5deg ATDC(vac connected) then disconnect and plug line and time at 6000 RPM I only get 33 deg. what I have done is split the difference at idle to around 2 deg ATDC which brings my 6000 advance to 36 deg.
If I plug vac line and time idle to 5 deg BTDC my idle is so high I almost have to close the air screws. this does give me a more crisp idle, especially during warm up, but I loose a little throttle response. This is due to losing that immediate advance from ATDC to BTDC. Also, with the air screws turned closed I have to turn down the idle circuit which means less air and fuel in the combustion chamber.