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Karpaazio · Joined: 03 May 2011 Posts: 121 Location: Finland

So I started thinking about does the N/A distributor change timing with overpressure, normally there is vacuum but in my case my 924 N/A is turboed so does the timing adjust work anymore on overpressure? and is there a difference in late 931 distributor to N/A?
_________________
Porsche 924 1978 Cabrió:
http://www.garaget.org/?car=219790
Porsche 924 widebody (next up?)
Toyota Crown LS110 1983:
http://www.garaget.org/?car=260537
Audi a6 2.7tt quattro 2000 daily driver

leadfoot · Posted: Fri May 03, 2013 6:20 pm Post subject:

N/A has mechanical and vacuum advance,

once you hit boost there would be no advance from the distributor, you would want to retard the ignition if anything...

stu
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1981 ROW 924 Turbo -
carbon fiber GT mish mash
LS1 conversion in progress...

Karpaazio · Joined: 03 May 2011 Posts: 121 Location: Finland

Thank you stu!

But am I able to retard it enough just by adjusting the distributor?
_________________
Porsche 924 1978 Cabrió:
http://www.garaget.org/?car=219790
Porsche 924 widebody (next up?)
Toyota Crown LS110 1983:
http://www.garaget.org/?car=260537
Audi a6 2.7tt quattro 2000 daily driver

leadfoot · Posted: Sat May 04, 2013 10:46 am Post subject:

That will retard the whole ignition curve and mess with the entire powerband and idle...
IIRC the early 931 used a vacuum and boost adjustment on the distributor before they went to DITC. Keep in mind the ignition curve is set for a different combustion compression ratio and shape, it may work but i would plot the mecanical and v/b curves and see if thats what your after.
Stu
_________________
1981 ROW 924 Turbo -
carbon fiber GT mish mash
LS1 conversion in progress...