i have a 91 crx with a d16z6 motor and tranny. i only have two aftermarket parts on it which are headers and intake... what can i do to my engine/tranny so that im not pushin 4k rpm going 70mph in 5th gear???

 

you cannot have a d16z6 tranny because it is hydro, your crx is cable, unless you converted it...

Anyway, get an SI transmission. You'll be changing your speed:rpm a little bit with that. But there isnt really anything you're going to be able to do to get higher speed but at a lower rpm.

Upgrad your valves/retainers/springs
-Bigger TB with port matched IM
-Good header (4-1)

 

oh ok, ill give that a shot. thanks brotha!

 

Get a DX or HF trans. But your acceleration will go down slightly.

 

Why either of those two? Because of the longer 5th?

 

and lower final drive, way lower

 

Im about to start rebuilding my 90-91 ex/si tranny pretty soon. Have to replace the throwout and input shaft bearing. I've always wanted to try and put an LX 5th gear onto an si/ex tranny.

 

I would just throw an HF 5th on there personally... I have though about doing that, but look at the gear specs and velocity ranges first, so you can understand how comfortable the engine will be shifting between the two... Engine work is not going to lower your rpms for certain speeds, the gears are set at a certain ratio, and those ratios do not change with engine work, only tranny work. You could get better fuel efficiency out of it if anything, but not lower rpms...