rpm limit for 930
#3
Rennlist Member
Phil, do all 3.3L cars have the same redline...6800?
The factory rev-limiter is CDI-based, correct? Do you know at what RPM the CDI pulls ignition? 7100? 7150? I've spun my [warm] motor to 7000 many, many, times and have yet to trip the factory fail safe.
Just curious...
The factory rev-limiter is CDI-based, correct? Do you know at what RPM the CDI pulls ignition? 7100? 7150? I've spun my [warm] motor to 7000 many, many, times and have yet to trip the factory fail safe.
Just curious...
#7
If your going to track it, I would get it dynoed to see where the torque & power band are. On my 3.5 twin plug street motor peek torque is at 5,000 rpm, and peek h.p. Is at 5,500. While I can take it to 6800 rpm, I don't see any benefit shifting there. Just my .02.
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#10
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#11
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Per the Porsche Katalog, rotor p/n 930 602 901 01 is used on all 930's from '75-'89, EXCEPT, on the US 930.68 motors of '86-'89, which use rotor p/n 930 602 902 00.
The 901 01 rotor used in my '79 has the built-in speed governor. I'm not familiar with the 902 00 rotor so I can't say if it has the governor or not.
#13
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The speed governor function is built into the 901 01 rotor and actually is pretty simple. As engine RPM increases the distributor rotor spins faster and faster until centrifugal force overcomes spring tension on a metal contact that shorts out the ignition. That's why, when you hit the rev limit ("Speed governor"), it feels like you've lost half of your spark plugs and your timing's gone all to hell. It is in effect, shutting the engine down from higher RPM's.
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#14
Drifting
Well the bad thing about tripping the rotor based RPM cut off is you loose spark but not fuel and you spray a bunch of gas into the cylinders that doesn't burn right away.
Phil
Phil
#15
Rennlist Member
Phil, would you happen to know if the later, '86-'89, cars employ a similar ignition-based rev-limiter? Or?