Unfortunately it is more like engine, manifold, pipe, clutch set up, drivetrain efficiency, track size, track layout, track surface, and most improtantly drivestyle combo that will yield long runtimes.
The 9901 is supposed to be the long runtime with softer bottom type pipe. I personally like the 2096 and the 9853 pipes. I have all three and it is not always the 9901 that yeilds the longest runtime for every track for me.
Experiment. Because some pipes, you may loose a little runtime, but you may be generally faster around the track.
Originally Posted by
Maximo
runtime is mainly to do with the driver and his/her skill tuning the engine...I can make about anything make 10 minutes with careful tuning, even modified 28's...........My advice is match the engine to your driving style first, then start worrying about runtime.....
Ok, thanks for the input guys. I'll start out with a PLUS-4BTT and a 9901 pipe and the 41021 mainfold.
Any thoughts about vernti size? If my goal is making 10 minutes pitstops would I use a larger or smaller venturi? Or does the PLUS-4BTT have a "sweetspot-size" venturi?