Final Drive Ratio, wheel, and WHP changes

Originally Posted by JeffP-Z

Hi Guys,

Been reading this thread and trying to understand all the numbers because I have been thinking about making a gear change as well. I have a 2010 with a 6MT with Stillen Gen 3 CAI, Berk Resonated test pipes, and Ark DT-S exhaust. My diff let got the other night and fortunately for me I already have an appointment to have and OS Geiken 1.5 diff installed. I was thinking of going up to a 3.9 or 4.08 but want to understand if will have the desired effect I am going for, which better acceleration for drag/roll racing performance. It seems like from the info post that the WHP will go down some but the torque will go up. Will this give me that improved acceleration I am looking for or am I misunderstanding?