Originally Posted by Jim981CS

I cannot comment on the the effectiveness of the FVD tune over the Cobb tune but only share my experience of the Cobb with PDK flash. I installed aFe catted headers and PSE with the Cobb 93 octane stage 2 tune with PDK aggressive flash on my 2014 CS. I nstalled all of this closely together so I did not evaluate the upgrades separately. My butt dyno noted a notable improvement in acceleration and elimination in the 3000 rpm torque dip. I also mounted the Cobb on the dash and set it up to monitor the actual coolant temperature, oil temperature,PDK temperature, transmission oil temperature, PDK race start counter and Lambda. You have a choice or monitoring six functions out of dozens and dozens of options including clutch pressure, engine timing,exhaust gas temperature……….and data logging. You can also add pro tuning if you even more power. I am happy with their system and feel I have sport’s chrono performance including launch control with their PDK flash.

With regard to the 25 hp difference between the 3.4 engine in the 981 and the 911 I saw a technical article that claimed that the 911 has a hotter cam with a 5mm higher valve lift. I always assumed the the 911’s extra 25 hp was in the software.
Jim

Originally Posted by Nip are

That's interesting they say the 991 has 5mm more valve lift. 5mm is a lot! Do you happen to know the source for that article?