Quote Originally Posted by hahnmgh63 View Post
Steve, with that Aluminum flywheel you may need some custom chips? I dropped a 3.6ltr 911 '91 year motor in my older '74 911S and went to a lightweight steel flywheel, Aluminum pressure plate package that removed #26 off of the OEM dual mass flywheel and the engine would die after the revs dropped from higher RPM's as is was so much more responsive without the extra weight that the fuel injection's idle circuit couldn't keep up and catch the engine as the revs dropped at idle without a well timed throttle blip around ~1200~1500rpm's to slow the deceleration. I had some custom chips made and all is pretty well now. Of course our Motronic is much more advance than my 1991 911 motor's?
The flywheel pictured is 9 pounds lighter than the solid steel UrS6+ flywheel. I'm hoping that it's not an issue as I've talked with a few folks that are running a similar flywheel with the 4.2 and received positive feedback.