Does anybody know how high my crx would rev at 70mph if i put a zc tranny in?
I have an 88 Crx dx with a SOHC ZC and stock dx tranny (which is not the greatest by any means) and i was looking into the zc tranny but i still need reliability and some decent mpg. So if anybody has this setup and could give me some info on how they like it i would appreciate it.

 

dual cam trans or ssingle cam zc trans. i am assuming the latter. I had an l3 zc single cam zc trans. had a great gearing ratio except on the highway i was turing 4k rpm's at 75 mph.

 

My D16a6 was faster with my DX trans than the SI that's in it now. I can't pass 115 now, however, with the DX, I had the needle buried. The only downfall of the DX trans is the bearings. Other than that, the only thing different is the final drive. Same for the Sohc ZC tranny. Either way man, here's a little more info. http://www.knology.net/~jedikl...s.htm

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by h8tred &raquo;</TD></TR><TR><TD CLASS="quote">My D16a6 was faster with my DX trans than the SI that's in it now. I can't pass 115 now, however, with the DX, I had the needle buried. </TD></TR></TABLE>

From my understanding there really no difference in gearing from 88,89 and 90,91 dx to si gearing as long as it’s a 5 speed . 4 speed well just through it away. Or it could be used as a large paper weight lol ive been told that si/dx trannys have better gearing than ZC trannys. ive hade a lot of both si and dx and I cant tell the difference but there was this one Si tranny I had bought from ATTARCO that must have been geared or something but it made my single ZC really move. Lol sorry for the life story.

 

how do you tell the difference between the zc dohc tranny and the sohc tranny by just looking at it?

 

The only difference with the SI/DX is the final drive, the DX has a longer/taller final drive hence the higher top speed. Depending on mods, the si will be quicker, but if you're putting down some power, the DX final drive in an SI case would be better...

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by h8tred &raquo;</TD></TR><TR><TD CLASS="quote">The only difference with the SI/DX is the final drive, the DX has a longer/taller final drive hence the higher top speed. Depending on mods, the si will be quicker, but if you're putting down some power, the DX final drive in an SI case would be better...</TD></TR></TABLE>

wouldnt that be just a stock Dx trans since the Si and Dx have the same gears????? but a diff final drive? my zc tranny (equal lenghth axles) has a tad bit longer gearing then my Si trans. the zc gears r like right in between the Si and Dx. the zc has the same final drive as the Dx but the gears r shorter then DX but a tad longer then SI.

my zc revs high on the freeway. say 75 mph is about 4k
i honestly love my zc trans. it ran 2 tenths faster at the track. but that was probably because i have equal length axles now. the gearing is good. but having the axles is a plus.so is having a stock LSD

 

No it wouldn't; the Si case has a bigger differential bearing which is supposidly stronger. The ZC transmission IIRC has the same ratios as the Si except for the ZXi's with the 4.437 Final drive.

The DOHC ZC transmission has the shorter gears; it's pretty much the 3.25 1st with the 1-4 gears the same as the 86-89 Integra transmission, 5th a tad shorter, and taller(3.88) final drive.

 

Si ZC
1st 3.25 3.25
2nd 1.894 1.944
3rd 1.259 1.346
4th 0.937 1.033
5th 0.771 0.878
final 4.25 3.888

 

Those are DOHC ZC ratios. SOHC ZC is the same as Si.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by K2e2vin &raquo;</TD></TR><TR><TD CLASS="quote">No it wouldn't; the Si case has a bigger differential bearing which is supposidly stronger. The ZC transmission IIRC has the same ratios as the Si except for the ZXi's with the 4.437 Final drive.

The DOHC ZC transmission has the shorter gears; it's pretty much the 3.25 1st with the 1-4 gears the same as the 86-89 Integra transmission, 5th a tad shorter, and taller(3.88) final drive.</TD></TR></TABLE>

not all the Si trans have the bigger bearings. sum have the smaller ones

 

I am going to pull this one back from the dead for a new question.

could I take 2-4th gear sets out of the dohc zc trans and put them into the si case?

if you go to this site and check out the graph, you'll see what I am after. a much shorter 3rd and 4th gear, but with the stock si 5th for highway driving.
http://www.fatboyraceworks.com...are=1

(well, this chart is a comparrison between a stock 95 civic si trans and the modded crx zc/si trans. I was thinking of assembling the crx zc/si cable trans and putting it into the 95 si, with the hasport hydro to cable trans adaptor of course)

and if it does fit, do you know if the 5th gear syncro can handle that steep a change from 4th gear?


Modified by crxcess at 4:10 PM 4/2/2008


Modified by crxcess at 4:18 PM 4/2/2008

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by crxcess &raquo;</TD></TR><TR><TD CLASS="quote"> could I take 2-4th gear sets out of the dohc zc trans and put them into the si case?
</TD></TR></TABLE>yes, just use the entire ZC mainshaft and 3rd and 4th gears with the Si 5th, put the ZC 1-4 and Si 5th gears onto the Si countershaft and install it all into the Si case using the Si differential - you end up with a ZC/Si hybrid