You people and your intake manifold hysteria, all Greg had to do was thank Hogan's once on TV. Guess the advertising paid off.
It really is a matter of the car tune-up matching the engine power and driving. For whatever reason, KB had the cars tuned almost perfectly for their engine power. Same with AJ in Bandimere. Nobody has put more laps on the mountain than AJ.
Let's look a little deeper while still barely scratching the surface:
10,500 Rev Limit -
1. Fewer Revs = Less Horsepower - Even if you lose torque per stroke, the more strokes in a given time will make up the torque loss.
2. Fewer Revs = Different Clutch Tune - Engine not spinning as fast makes less clutch plate load. If you were revving way upstairs to shift and just lost 1000-1500 RPM at your shift points, you will probably be blowing through the clutch when you shift if you leave everything alone.
3. Fewer Revs = Motor falls deeper at gear change. If your gear splits and clutch tune were creating a 2200 RPM drop once shifted, and you were shifting at 11,000, Motor falls to 8800, getting back in the primary powerband much faster. Again, back to 10,500, motor now falls to 8,300. Again, do you have enough clutch on to make up the 500 RPM difference? Can you change gear splits without killing clutch or bogging motor once in high gear because the jump from 4th to 5th was too wide?
4. Fewer Revs = Different Rear Gear = Different transmission gears
5. Fewer Revs = Shift the power band back to a more useful range under new rules and find the power you used to have with 1,000 less RPM.
EFI -
1. How close can you mimic the fuel delivery behavior of your carbs?
2. Airflow differences between the big single TB and 8 carb barrels?
3. Injector atomization vs. Carb. How much cleaner is the air/fuel mix?
4. If injectors are more efficient, how much more efficient? You're probably going to be rich as hell if you use base fuel flow numbers from the carbs.
5. Rich mixture = Less Power/Engine Acceleration, which is crucial since PS cars spend most of the run with the clutch locked to the motor.
Shorter Wheelie Bars -
1. How much harder do you have to hit the tires at launch with gear/clutch/RPM to keep the front end down?
2. How much is too much?
3. Can you change weight around to mitigate the effect?
4. What can you change in suspension settings?
5. Tire Pressures?
6. Launch RPM?
Not even scratching the surface there are already 16 things to consider and learn with the changes and all 16 need to be dead on the money to get the best pass for the conditions. And you get conflicting data all the time, more power on the dyno, slower on the track. More power means the ability to burn more fuel, but where in the RPM range does it need it and where doesn't it? Another problem can also be that engine builders can get hung up on making power at Max RPM, but on the track the car only sees max RPM for .2 seconds the entire lap. Makes big power on the dyno, but every time the driver pulls the next gear, it's down 50-100hp off that max number trying to grunt it's way back up and everyone is wondering why it isn't running better with that big power number.