Originally Posted by
Sulland
I tried to find a good dicussion that was going a while back, regarding how much difference 1 mm will represent.
I could not find back to it, but found this old one on the same topic.
Rally3 went up 1 mm from 30 to 31, and got 20 hp more. So it is closing in on Rally2 that officially has 290 and now Fiesta Rally3 with 235 hp.
So my question would be:
If a Ford Rally3 with 1500cc engine was given a 32mm restrictor, how much power would that one gain from 31 to 32mm?
I am guessing that the calculation would not be 100% linear, and we have a difference of 100cc as well.
Is there a simple way to calculate power increase to an engine type, if you increase the restrictor with x mm?