Timing to Non-California Spec?
 

Hi All- Have a 77 911S California Spec, the timing is still set to 15deg after TDC at idle with Vacuum line on. Is there any advantage to going to 0 Deg like the 49 State cars without making any other changes aside from blocking off the egr? Also, the 49 state cars specs suggest pulling the distributor vacuum when setting timing, but when I remove the vacuum line my idle jumps to 2200RPM. Not sure whats happening there...

BTW, emissions are not an issue where I am.

Thanks!

dave...I have a Calif. '77.. and to my understanding Calif. 911's has a funny advance curve if set to stock settings for initial timing..they made them run cleaner, for smog testing, by running the engine very retarted at idle and low rpm's..so, the engines will run hotter at idle and low rpm's...what I did was disconnect the vacuum permanently..then lower idle..then set total advance at 35 degrees..

..if in a mountain region.. you may want to pay attention for under 2.5k pinging..you may have to run 2 deg. or 4 deg. less total timing to enjoy your better running 911..........Ron

thank's Ron. I'll see if I can back the idle down without the vacuum hose connected.

Dave