Originally Posted by dinasrt
Perhaps a factor for them in deciding to make a 65mm (in addition to the safety factor) is the ability of keeping a market for their 181's & 185's. ?? I would sure buy a 63 though; today!
Some of the fastest cars here are with the Code3. Having boost build so much quicker with the 181 makes some interesting problems with closed loop fueling. I can get 10+ psi right at 2000 rpms with small throttle openings. This keeps AFRs at 14.7 and I can hear lots of pinging and even some detonation. So I'm forced to punch it!
Also you build more heat at highway speeds raising your overall IATs.
I think the 178 equivilent is optimal.