I looked at the specs for your F22, and I wonder if the low compression ration has an effect. If I had to guess, I'd say the Pulstars have more of an effect for higher compression ratios and higher red-lines.

 

Yes, my thoughts exactly. Im still learning about how engines work but I think it may be the kinda situation similar to octane levels. Higher octane for high performance engines and in normal cars it doesnt make too much of a difference. A spark is a spark and the RPMs dont go as high or perform well as high. Also the sophistication of the computer controlling all this. Plus I used the pulstars for gas efficiency and not performance.

One thing about the f22 is it was designed to deliver very good gas efficiency for 150hp. It may be 'maxed' out in that category?