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Registered
Join Date: Aug 2015
Location: Cologne / Germany
Posts: 707
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Quote:
I have the late heads with smaller ports.
I’m going with the backdated SSI exhaust,
Seems like that’s the nice safe upgrade since
I need one.
Thanks
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You'll suffer from mid range torque loss. The benefit of 964 cams is rising the power band on high revs from 5500 Rpm and above. And in case of engines with small ports – here for a sufficient airflow the diameters are too small for a benefit of cams with power present on high revs.
See in this thread further below, its in german, but an online translator will make it at least a bit clear for you:
http://www.elfertreff.de/showthread.php?t=26670
Especially this one where you can see more or less whats the approx. difference between SC and 964 cams in a 3.0 CIS engine.
The whole torque will be moved forward to higher rev areas.
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911 SC 3.0, 1982, black, US model – with own digital CPU based lambda ECU build and digital MAP based ignition control
All you need to know about the 930/16 and 930/07 Lamba based 911 SC US models:
https://nineelevenheaven.wordpress.com/english/
Last edited by AndrewCologne; 05-08-2020 at 04:50 AM..
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