CGX car nut:

However, if the valve train doesn’t have any more headroom for a higher RPM limit than that is a fixed variable.  The M139 has the same redline.  

Yes, I noticed that the redline was the same as A45S.  I wonder if it's as simple as using better valve springs or some other bottleneck?


--

 

18 GT3 Manual, 73 Carrera RS 2.7 Carbon Fiber replica (1,890 lbs), 06 EVO9 with track mods. Former: 16 Cayman GT4, 73 911S, Two 951S's, 996 C2, 993 C2, 98 Ferrari 550, 79 635CSi