Changing the final drive to 4.77 or even to 3.9 will dont affect your dyno numbers at all. Same with changing the gear ratios, and the same thing with getting a lighter flywheel. None of these things change your dyno numbers. It does however affect how your car accelerates. As far as drag times go, your just going to have to go to the strip and see how it does, theres graphs of different final drives on this board that show where the diff. FD's are faster than the others but its still hard to correlate that to drag times. I wouldnt go with anything other than the 4.77 for both the ap1 and ap2.

OT: but the guys with ITR's love the 4.928 and go crazy over 5.077 which is very hard to come by.

 

4.77 is probably as far as i would go for my daily driver. if it was strictly for race only then i might get the higher ratio. i will be headed to the strip to see what kind of difference the 4.77's really made for me as everyone with 4.77's 1/4 mile times will vary from driver to driver.

 

What are your RPMs at say 80 mph? 75? 55? Any idea on what you get for gas mileage doin like 75 or 80?

 

5000 @80 mph 4000 65 mph

 

so is it not worth getting the 4.44 or the 4.57? cause those were the two i was looking at.

 

how much of a difference if any does it make between AP1's and AP2's?

 

Getting any of the shorter FD's(4.44 4.56 4.57 4.77) is worth it, each one has their pros/cons. The high revs on the highway wont affect gas mileage but they will affect the engine life and of course more noise. I have been in an ITR with the JDM 4.7 FD and one with the ATS 4.9 FD and both were stock, the one with the 4.9FD pulled a hell of a lot harder.

 

You can also shorten and lenthen the final drive by tire size so its not like your just stuck with 4.77 or any other FD. You can shorten it to 4.9 or make the 4.77 into a 4.57.

 

i had the 4.77 installed in my ap1, and the acceleration was great, but at highway speeds, i was almost in vtec at 74 mph. however, i my rear end went bad, and i'm dropping down the ricks 4.56, which is currently being installed, i'll update the difference when i get the car back.

 

how did your rear go bad? Was it from the current gears.