Quote:
Originally Posted by JDM_Import
Im aware this kit makes more grunt down low hence why I chose the 210. I find it more benifitial since I daily my car and mostly street driving is done under 5k rpms. Honestly Ive never considered changing final gears but Ive heard guys changing them and getting more torque. Whats the difference between 3.9 vs 4.56? Correct me if Im wrong but from my understanding changing final gearing your sacrificing top speed for wheel torque?
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Yes, pretty much. The difference between gear ratio (in this case 16.5%) is the difference in top speed per gear, as well as the torque multiplication from gearing. One will do 93mph and the other 80mph in the same gear at same RPM. But the second one will have 16.5% more torque to the wheels in each gear. although you lose that advantage momentarily when you have to shift to the next gear both wasting shifting time as well as losing wheel torque from the gearing and the first one can ride out in same gear longer. You really need to choose a FD specifically for your intended use of the car and know why you want an FD swap for in order to choose which ratio is best.
But generally a shorter FD (higher number) will pull and feel more aggressively. with FI though going higher isn't really needed, and a lot of times people go longer (lower number)