which one is better , people have said zc is better but i dunno

 

Si for fuel economy, ZC for racing. Si is generally considered the best compromise.

 

the DOHC ZC's came with optional LSD! always a plus

 

Go with the zc tranny from http://www.hmotorsonline.com if you want accelleration. It's a different type of zc that uses the si 1-5 gears but a HUGE 4.43 final drive. Basically, it RIPS through the gears like you wouldn't believe. I've got a sohc zc with just a homemade intake and 2.25'' exhaust and I run a 14.9 on kuhmo tires. Although, if you want fuel economy definately go with the si tranny.

 

ill tell you flat out gas economy is better with the si tranny but the zc pulls harder threw the first three slightly. you can also swap some of the gears from single cam trannies to make a hybrid. i have seen people do that to customize their own gear ratios but stock for stock zc tranny takes it!!!! the only thing about the zc tranny is you have to swap axles and make sure you get the half shaft with it.

 

hey i was wondering how mucha zc tranny from h motors cost with shipping i see that its 100$ but how much is shipping with it

 

I think they charge $100+ to ship it.

I just bought an Si tranny with ZC gears in it. Cant wait to try it out.

 

Anyone have any input on the gas mileage with a ZC tranny? Like 5, 10 MPG difference then Si?

 

the tranny will bolt up toa d15b motor without having to change axles or half shaft right

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ijjz &raquo;</TD></TR><TR><TD CLASS="quote">Anyone have any input on the gas mileage with a ZC tranny? Like 5, 10 MPG difference then Si?</TD></TR></TABLE>

Well, I've got a zc tranny and my best friend has the si tranny and he gets about 30mpg and I get like 27 so not that big of a diff. Get a zc

 

Not bad of a difference at all.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by bbrian &raquo;</TD></TR><TR><TD CLASS="quote">the tranny will bolt up toa d15b motor without having to change axles or half shaft right</TD></TR></TABLE>

can anybody answer this question because i would also like to know. thanx.

 

bump, i would also like to know

 

I know that question can be anwsered with a search. I've seen it asked before but i don't remember the anwser.

 

so...are we talking about the sohc or dohc zc? does it even matter?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote &raquo;</TD></TR><TR><TD CLASS="quote">the tranny will bolt up toa d15b motor without having to change axles or half shaft right</TD></TR></TABLE>

So far as I know, all the ZC transmissions use an intermediate shaft and equal-length axles. The intermediate shaft has a larger male end on it than Si, DX, or Si stock axles (where it goes into the differential), so stock USDM CRX axles won't fit. Also, the engine blocks on the HF and DX don't have the mounting holes for the intermediate shaft's mounting bracket where it mounts to the block. Some of them have the places for the holes, and some actually HAVE the holes, but they're not threaded. The Si (D16A6) block DOES have the holes, tapped and threaded and ready to go, because that engine was used in the '88-'91 Civic AWD Wagon, which also got an itermediate shaft (but it's not the same shaft as the ZC one; it's *close*, but not identical).

Soooo... If you're mounting a stock ZC tranny to a stock D15B2 or D15B6(that IS the HF block, I think?), you need to find a solution for the axle, or at least for the driver's-side axle. Some of the later D15 blocks, or some of the JDM D15s, may have the mounting point for the intermediate shaft on them; I don't know for sure.

There have been people who say that you can use some Accord driver's-side axle on the ZC to do away with the intermediate shaft (it should be an '86-'89 Accord axle, if I remember correctly, because the '90-up Accords also got an intermediate shaft), but I've never tried it so I can't say if that's true or not.

If you don't have a place to mount the intermediate shaft to the block, one solution is to do away with the ZC differential and swap an Si differential into the transmission in its place; this will allow you to use stock Si or DX axles, at least on a DX. The HF might not be that easy, since it has different-sized hubs that generally don't fit DX/Si axles.

There ARE solutions, but none of them are dead-simple swap-n-go solutions for dropping a stock ZC tranny into a stock HF or DX. Even on an Si, it's not really plug-n-play: you still need the intermediate shaft and different axles ('90-'93 Integra non-ABS, I think is the typical solution, and removing a dust-seal clip on the driver's side hub to stop it from binding), or you can get custom axles made to fit, or you can customize the tranny to use your stock axles by swapping in your differential (which you can also do if you've got a DX or HF). It all adds expense over and above the cost of the ZC transmission.

Does any of this info answer your questions, or just raise more questions, or both?

Mike

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Kwicko &raquo;</TD></TR><TR><TD CLASS="quote">So far as I know, all the ZC transmissions use an intermediate shaft and equal-length axles. The intermediate shaft has a larger male end on it than Si, DX, or Si stock axles (where it goes into the differential), so stock USDM CRX axles won't fit. Also, the engine blocks on the HF and DX don't have the mounting holes for the intermediate shaft's mounting bracket where it mounts to the block. Some of them have the places for the holes, and some actually HAVE the holes, but they're not threaded. The Si (D16A6) block DOES have the holes, tapped and threaded and ready to go, because that engine was used in the '88-'91 Civic AWD Wagon, which also got an itermediate shaft (but it's not the same shaft as the ZC one; it's *close*, but not identical).

Soooo... If you're mounting a stock ZC tranny to a stock D15B2 or D15B6(that IS the HF block, I think?), you need to find a solution for the axle, or at least for the driver's-side axle. Some of the later D15 blocks, or some of the JDM D15s, may have the mounting point for the intermediate shaft on them; I don't know for sure.

There have been people who say that you can use some Accord driver's-side axle on the ZC to do away with the intermediate shaft (it should be an '86-'89 Accord axle, if I remember correctly, because the '90-up Accords also got an intermediate shaft), but I've never tried it so I can't say if that's true or not.

If you don't have a place to mount the intermediate shaft to the block, one solution is to do away with the ZC differential and swap an Si differential into the transmission in its place; this will allow you to use stock Si or DX axles, at least on a DX. The HF might not be that easy, since it has different-sized hubs that generally don't fit DX/Si axles.

There ARE solutions, but none of them are dead-simple swap-n-go solutions for dropping a stock ZC tranny into a stock HF or DX. Even on an Si, it's not really plug-n-play: you still need the intermediate shaft and different axles ('90-'93 Integra non-ABS, I think is the typical solution, and removing a dust-seal clip on the driver's side hub to stop it from binding), or you can get custom axles made to fit, or you can customize the tranny to use your stock axles by swapping in your differential (which you can also do if you've got a DX or HF). It all adds expense over and above the cost of the ZC transmission.

Does any of this info answer your questions, or just raise more questions, or both?

Mike</TD></TR></TABLE>

^ VERY good info about fitments. Wish i had someone write somethin like this for me months ago. something to add - supposedly you can pop an integra diff into the si or zc tranny. doing this, you can figure out a way to get the equal axles (pretty sure the integra axle, though fitting into the tranny, wont be right length for an ef.)