B20b????

[hattech-v]

Hmmm....maybe right maybe wrong but here is how you calculate FD and compare...

GSR: FD 4.400
ITR: FD 4.785

So, 4.785/4.4000 = 1.09, therefore, if you are at 180kmh then your RPM will be...say GSR at 8000rpm then ITR will be at 8720 lah.....which means you will crank will be turning faster than the GSR and get to your peak HP faster and able to hold at the peak power for a longer period of time.....may not answer your question directly but u can make head or tail out of it...

can use this calculation on top speed oso?