looking to get your input on which final drive should I settle with if im going to put down abt 600-700 whp?
im running fully built gsr boosted. im planning to stay away from dog box and sychrotec offers 2 different final drive on carbon sychros.

 

btw its between a 4:40 or 4:27 and which one will give me the best benefits.

 

btw im looking in between a final drive of 4:40 or 4:27

 

my 2007 civic hybrid puts out 85 square feet of boost

 

The following information is assuming that you are using a GSR gear set.

With the 4.4 Final drive and using a 24.5" Tire:

Turning the engine to 8500 RPM you will trap 139 MPH in 4th Gear
Turning the engine to 9000 RPM you will trap 147 MPH in 4th Gear
Turning the engine to 9500 RPM you will trap 155 MPH in 4th Gear
Turning the engine to 10000 RPM you will trap 164 MPH in 4th Gear

With the 4.2 Final Drive and using a 24.5" Tire:

Turning the engine to 8500 RPM you will trap 143 MPH in 4th Gear
Turning the engine to 9000 RPM you will trap 152 MPH in 4th Gear
Turning the engine to 9500 RPM you will trap 160 MPH in 4th Gear
Turning the engine to 10000 RPM you will trap 169 MPH in 4th Gear

So depending on how high you plan on turning your engine and what trap speed you expect the car to achieve, you can make your choice!

 

thanks i talk to david from sychrotech and he help me out base on my built