Can you tell me exactly how many rpm's your turning a 60mph. When I do the math I get a figure that seams kinda high. I'd like to confirm this before I order a different 5th gear for my planned swap.

Thanks,

Jim C.

 

on a H23A1 5spd. 5th gear going 60mph is almost exactly 3000rpm

its prolly pretty close to the H22A1. looking at the gear ratios.



-Vi

 

What gear ratio for 5th are you using? And what final drive ratio?

My info say's 5th for the 92-96 SI vtec 5sp prelude is .87 . With a final drive ratio of 4.27:1

Giving 135mph at 7500rpm's. When I divide 135 into 7500, I get 55.56 rev's per mile per hour. So 55.56 X 60 (MPH) I get,
3337 rpm's at 60mph

Know when I take the SI (non vtec) and it's 5th gear ratio of .81 and the same final drive of 4.27:1, I get 127mph at 6500rpm's.
I get 3070rpm's at 60mph.

I really hoping that I'm wrong and it's really is at most 3000rpm's.

 

that sounds right. i have the Si (non-vtec) and its almost exactly at 3000rpms (your calculations were 3070rpms) so you're prolly right with the 3337 for the vtec transmission.

ive seen a lot of people take the F22A1 manual transmisson from the S model 92-96 prelude. it has a much taller 5th gear. great for turbo applications and such.



-Vi

 

That's my plan, but I was hoping, really hoping that I was wrong and wasn't going to have to do that. I'll be commuting with the car, so it's really important to me. Thanks for the imput.

I might as well have them inspect the syncro's for 2nd and 3rd while the case is open.

 

prolly good idea to have the syncro's checked. i gotta rev match downshifting to 3rd so it doesnt make a wonderous cruch-grinding noise. better to get that taken care of. make sure you put a good quality MTF in there too. Redline or Honda MTF, is suggested.



-Vi