Reading my statement, I said it will be a 6500rpm engine once in the car, not make HP to 6500rpm!
If you have an engine that makes 500HP at 5700rpm, and maintains within 10HP of that for 500rpm after peak, you need to run past peak in order to take advantage of that HP. It takes TIME for the engine to put that to the wheels and accelerate the car so you need to rev the engine past 5700 rpm and in this case it'll probably like between 6200-6500 before a shift.
But having said that...once he puts exhaust on the car, and ANY changes made from dyno testing can lead to less rpm or less HP in the car.
I had a customer dyno a 505 Mopar and made 768HP at 6400rpm and he said at the track it ran best shifting at 6200rpm....????
So I started asking him questions about what he changed and basicly he added an exhaust system with cutouts that unbolt and that's how he ran it.
Well they were 6" too short over the extensions we used on the dyno to get good HP so he dropped the system (which weigh'd roughly 60lbs.)and added the correct extensions and picked up 3mph and .2 with no other changes!!
