Quote:
Originally Posted by Evan Fullerton
A stock 3.2L isn’t recommended to exceed the factory redline unless it has ARP rod bolts. Redline on 3.2L are set by the chip in the ECU. Need an aftermarket eprom tune to change the redline. With ARP rod bolts and well setup valve train 7200-7300 is the accepted max recommended RPM until you start changing valve springs and rods.
3.0L stock are good to 7000 ish because of the larger factory rod bolts. These the redline is controlled by the distributor rotor if so equipped. Early 911S I think is 7300…… but they all vary a bit depending on the actual spring in the rotor.
Only really of importance for Autocross as none of them will make much power over 6500 with stock cams and intake.
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Awesome thanks for the super thorough response!!
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