My FE/Performance Project

[imzjustplayin]

Originally Posted by pgfpro

My transmission has a .750 5th gear(P20/B000 92-95 Civic Si / 93-95 del Sol Si D16Z6) I'm going to a .702 5th gear(P20/B00 92-95 Civic EX D16Z6.)
They share the same
1st gear 3.25
2nd gear 1.90
3rd gear 1.25
4th gear.909
final gear 4.250 ratios the only difference is the 5th gear .702/.750.

I know its not to much of change but my plans are for only a 5 mph increase at the same rpm using the .702 with a taller tire.(so I can cruise at 65mph freeway speed)

I tried a VX tranny with my engine combination and it actually was a lot worse then with the Si trans.

Now if I had better aero mods I could use the VX transmission at a higher mph and it would probably work very well.

If a VX transmission is too tall, then try the final drive CX transmission from the '96-'00 Civic or the final drive from a M/T HX '96-'00 Civic. You're not going to notice an improvement from .75 to .702. If you're not aware, the HX and CX transmission from a '96-'00 Civic have a final drive of 3.722. This is taller and therefore better than the 4.056 of the DX/LX Civics but not nearly as tall as the 3.25 of the CX/VX Civics of 1992-1995. I'm considering that final drive ratio if I find that the CX/VX transmission that I plan to swap into my Civic is too tall to be driveable, a concern that you seem to have as well. Yes it'd be nice to bring that .75 down to .702 but I think it'd make more sense to change out the final drive as you still have a very short final drive what with that SI transmission and all.