After I had finished the sim work on my Stage I project, I soon thereafter began working on a Stage II configuration. Bear in mind that I spent months on the Stage I sim work. A little less than that on the Stage II project. The results were very interesting. I still have the files for both builds. Maybe one day I'll go forward with the Stage II build. The interesting thing was how at the low and mid rpm ranges, the power levels very closely mirrored each other. It was in the higher rpm band where the port velocities of the Stage I ports began to offer resistance to flow that the Stage II configuration just kept climbing as the Stage I configuration began to level out. At a certain point, the Stage II ports would also hit that velocity where resistance to flow began to level out the power level. You see, it's the optimum port velocity through the port and matching that port to a particular rpm band using a camshaft to match that is the key.Don, i'm just thinking more boost = more air in = more power. If you could do some calculations on your software with some changes with valve size and intake CC',head cfm, comparing your heads to typical S2 heads I'd like to see something to support or disprove my theory of this whole debate, that the bigger heads will net no gains with lower rpm's and smaller cams over production heads. PLease take your boost numbers up to 40 psi with air to air inter cooling with a turbo flow about 115/lbs min and 1.28 ar. 1-7/8" headers, 90MM TB. Thanks Ttypewhite for your input, the thread title should be changed I agree. Also the dyno may not be the best to determine how fast the car will go, I agree but it does give some idea, on the direction I am need to go in.
Long ago, I printed out a hp/tq graph that overlayed the Stage I and Stage II power curves. The Stage II power curve made the Stage I power curve look pitiful. But, the difference was only in the higher rpms. I still have that Stage I/Stage II graph comparison printout magnetted to my tool box at the shop. I'll try to remember to take a pic and post it. Or, just rerun the comparison and make a screen shot.