Si Or ZC Tranny for ZC??

[NoBoost]

what would the best tranny be for the zc? the crx si tranny or the stock zc tranny? whch one is better geard for acceleration?

[91ZCcivic]

Im using the ZC tranny right now, but 5th gear is a little short at the high end. I heard that the best is to mix the ZC and the Si trannys together by adding the 5th gear from the Si to the ZC for a better top end. But here's the part that you should really pay attention to. The ZC tranny uses an intermediate shaft for the drivers side axle (two pieces) which are nearly impossible to find for some reason and you CAN'T use the intermediate shaft from the 88-89 Teg. I would personally go with the Si tranny.

[1990civicsiguye]

just what he said if you have both crack it open an put in the si final drive gear otherwise if you dont your looking at like 5500 rpm at 80 mph.....

[katman]

The ZC tranny uses an intermediate shaft for the drivers side axle (two pieces) which are nearly impossible to find for some reason and you CAN'T use the intermediate shaft from the 88-89 Teg. I would personally go with the Si tranny.

If you use a ZC tranny in a 88-91 civic/crx, all you need are a complete set of 90-93 integra axles. The ZC tranny doesn't use any special axles, they're just DA integra axles. I believe there's different lengths in 90-93 integra axles though, so the best solution is to use the int. shaft that comes with a ZC tranny or find a cable B16A int. shaft because they are the same in length.

[Jmorin]

what would the best tranny be for the zc? the crx si tranny or the stock zc tranny? whch one is better geard for acceleration?


Yea, a ZC tranny with the SI 5gear is the best thing you can do.

[91ZCcivic]

Katman is way wrong man. TRUST me I know, I went throught the intermediate shaft thing, I swear to god you'll have to use an intermediate
shaft from a ZC engine only and they are rare as F$#K! You can't use one from an 88-89 teg. Also 90-93 teg axles are the same length. I went through about 5 different axle set ups to see which ones work. I tried to use a 91 CRX si shaft for the drivers side... didn't work. The splines on the tranny side where to small if I remember. I tried an 89 teg intermediate shaft and it didn't bolt up to the engine at all and it has to. I tried to use the ZC shaft with 89 teg axles and they totally twisted up and broke all to hell. Now Im using the ZC intermediate shaft with the 90-93 teg axles on both sides right and left and Im having no problems what so ever. Trust me dude. you can even call the guys at Hasport and ask them. The gay guys at Nippon told me to use 88-89 teg axle... they lied

[3.8turbo]

91ZCIVIC is correct, the ZC int shaft is a completely different animal. no usdm intermediate shafts work. take his advice

[91ZCcivic]

I found all that info out the hard way. Its a soar subject for me hehe. :x

[katman]

Katman is way wrong man. TRUST me I know, I went throught the intermediate shaft thing, I swear to god you'll have to use an intermediate
shaft from a ZC engine only and they are rare as F$#K! You can't use one from an 88-89 teg. Also 90-93 teg axles are the same length. I went through about 5 different axle set ups to see which ones work. I tried to use a 91 CRX si shaft for the drivers side... didn't work. The splines on the tranny side where to small if I remember. I tried an 89 teg intermediate shaft and it didn't bolt up to the engine at all and it has to. I tried to use the ZC shaft with 89 teg axles and they totally twisted up and broke all to hell. Now Im using the ZC intermediate shaft with the 90-93 teg axles on both sides right and left and Im having no problems what so ever. Trust me dude. you can even call the guys at Hasport and ask them. The gay guys at Nippon told me to use 88-89 teg axle... they lied

Well, we all have our personal experiences with these things, and from my past experience on a friends 91 civic Si, we simply used 90-93 integra axles on the 2nd gen DOHC ZC engine we had. Luckily our motor came with the half-shaft and all worked out just fine with the 90-93 teg axles.

I know 86-89 integra axles don't work, one side is too short.

You CAN use a B16A int. shaft though. I've compared both a 5speed 89-91 B16A half-shaft & 89 ZC half-shaft and they're exactly the same. All ya gots to do is compare & contrast before doing any installing.

[91ZCcivic]

Hmm Im not to sure about the B16a Shaft, but I never tried it. The guys at hasport told me the only thing that will work is an original ZC shaft due to the hole pattern on the bracket.

[90SIsohcZC]

I have a sohc ZC with my 90 SI tranny and I really like it. Not to bad in town but has great top end. (i toast my buddy with his 90 DA9 teg) Not sure what it will run but I did do a side-by-side run with my friend in his 01 Z28 (his speedo is farely acturate at those speeds) and he was showing just over 150mph when i finally quit. So I think it can do about 145mph or so.... 8)

[transzex]

145 mph?

How much boost or spray you using?

[91ZCcivic]

damn that 150mph mark sounds hella high. How long did it take to get there? Where you going down hill or something? Thats crazy! Awsome if its totally true. What the heck.. i believe ya. Im going to have to try that on mine now too, but your engine is SOHC, most of ours in this forum are DOHC. Hey.. does anyone know if the ZC ECU's have a speed limiter? I have yet to get over 120 w/o Nitrous.

[90SIsohcZC]

damn that 150mph mark sounds hella high. How long did it take to get there? Where you going down hill or something? Thats crazy! Awsome if its totally true. What the heck.. i believe ya. Im going to have to try that on mine now too, but your engine is SOHC, most of ours in this forum are DOHC. Hey.. does anyone know if the ZC ECU's have a speed limiter? I have yet to get over 120 w/o Nitrous.

It wasn't down hill or anything just a LONG straight. The wind was with me. (which does help but still) The car was taching just under 7000 in 5th. If you work it out it is just shy of 150mph. Like I said before I have a friend with a Da9 teg with no limitor and I can tear him up. Also I have a friend from Cinn. with a turbo 95Ls teg that I can stay side-by-side with over 120. Its all aero. If the wind is against me I can feel a HUGE difference. Also that is with my CAI on which you would have to see to believe. Its bacisly a ram air system and at those speeds it creates just over 2psi of boost. You can see my CAI from the front if you look straight at it. Very nice stuff.

[hatch-attack]

I would just use the si tranny so you don't have to go through all this trouble finding parts

[91ZCcivic]

The Si tranny is the best damn way to go. But I had the Standard 4 speed tranny in my civic originally. So the ZC was heaven. I would go with a Si tranny if I ever do this type of swap again. Or if my ZC tranny goes out.

[davens]

Also that is with my CAI on which you would have to see to believe. Its bacisly a ram air system and at those speeds it creates just over 2psi of boost. You can see my CAI from the front if you look straight at it. Very nice stuff.


I would REALLY like more details on this...pictures and such.

[shlammed]

5500rpm @ 80mph with SI tranny? WTF? I never heard that before...that just makes me wanna not buy the motor now.

[91civicDXdude]

It wasn't down hill or anything just a LONG straight. The wind was with me. (which does help but still) The car was taching just under 7000 in 5th. If you work it out it is just shy of 150mph. Like I said before I have a friend with a Da9 teg with no limitor and I can tear him up. Also I have a friend from Cinn. with a turbo 95Ls teg that I can stay side-by-side with over 120. Its all aero. If the wind is against me I can feel a HUGE difference. Also that is with my CAI on which you would have to see to believe. Its bacisly a ram air system and at those speeds it creates just over 2psi of boost. You can see my CAI from the front if you look straight at it. Very nice stuff.


http://4thgencivic.driftkids.com/hondatech_bs.jpg

just what he said if you have both crack it open an put in the si final drive gear otherwise if you dont your looking at like 5500 rpm at 80 mph.....

The Si Final drive in a ZC tranny will make the rpms HIGHER in any given gear at that mph. the ZC tranny has a 3.8 final like the USDM DX and the Si has a 4.25

[SilentWrath*]

damn, someone threw the bs flag....fight!!fight!!fight!!fight!!

[transzex]

The car was taching just under 7000 in 5th........

I'll assume 7000 rpm was correct, even though likely it was a stock tach in which the rpms would more likely be 6700.

SOHC ZC = standard Si motor.

7000 rpm / 336 / 4.250 / .771 x 22.7" = 144 mph.

You need about a 85 shot of nitrous to obtain that speed on a non VTEC motor.

Funny, I run a 85 shot on a VTEC motor, wonder how I came up with the numbers?????

Your RAM AIR idea doesn't float either. Unless you have a 12"x12" area ducted into the intake piping.

My little D15B7 could hold off 99-00 Si's to 125 mph.

Welcome to Cincinnati, where the shit talking gets DEEP.

[SilentWrath*]

my friend got his 94 accord ex 4dr automatic (f22b1?? i think) up to 145 with 2 other peeps in the car...then he started bouncing off the rev limiter, at first when he told me i didnt believe him, so he did it again with me in the car too

i know stock tach and speedo arent the most accurate, but even if its a little off its still impressive for an accord with an intake

and on my last trip to ATL i got my DPFI d15b2 90 hatch up to 120...i didnt think the slug could do that

[90SIsohcZC]

The car was taching just under 7000 in 5th........

I'll assume 7000 rpm was correct, even though likely it was a stock tach in which the rpms would more likely be 6700.

SOHC ZC = standard Si motor.

7000 rpm / 336 / 4.250 / .771 x 22.7" = 144 mph.

You need about a 85 shot of nitrous to obtain that speed on a non VTEC motor.

Funny, I run a 85 shot on a VTEC motor, wonder how I came up with the numbers?????

Your RAM AIR idea doesn't float either. Unless you have a 12"x12" area ducted into the intake piping.

My little D15B7 could hold off 99-00 Si's to 125 mph.

Welcome to Cincinnati, where the shit talking gets DEEP.

Tape it I shall. Ok lets flame away. I will just tape it and load it up to the indycarz.net site. It might be just a bit before I can have it done. I will post when it is ready. I am not going to start any shit with any of you I actually kinda like this site (for once a good forum), I am I here to stay. If you really don't believe me (in the word of the man himself) I ain't mad at ya. No beef here. But even if it is only taching 6700 that would mean that the 01 Camaro that was RIGHT beside me is also off by huge numbers.....hhmmm..... Oh well whatever floats your boat. Like I said I will just tape it for you guys still like I said no hard feelings here. I expected that kind of reaction, most do the same untill I do it right beside them.