Topic says it basically. Here's my setup, ZC SOHC and I'm gonna be running a t3 super 60 turbo on built bottom end and head good for 9k rpms. My goal is I want to be well into the 12's if not high 11's. So my question is, should I go with the really long hf tranny and use more boost or use my extremely short zc tranny and use less boost /gear based boost control? Thanks for the input.

 

zc tranny.

 

anybody else??

 

longer gears for boost rumor must be stopped.

ZC

 

Neither....LSD tranny geared to your specs.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Ace$nyper &raquo;</TD></TR><TR><TD CLASS="quote">longer gears for boost rumor must be stopped. </TD></TR></TABLE>

But it helps with backpressure so you don't lose power!

 

ZC tranny W/ more boost..... If your shooting for 11s anyways... Good Luck...

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by CRX Toad &raquo;</TD></TR><TR><TD CLASS="quote">Neither....LSD tranny geared to your specs. </TD></TR></TABLE>
Arn't some ZC trannies LSD or that just urban myth?

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by drdisco69 &raquo;</TD></TR><TR><TD CLASS="quote">

But it helps with backpressure so you don't lose power! </TD></TR></TABLE>
oh w3rd

 

The HF trans is junk for anything performance oriented and yor assumption of more boost with a longer geared trans is incorrect, get an LSD ZC trans or a hybrid trans with an aftermarket LSD

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by K20EF8 &raquo;</TD></TR><TR><TD CLASS="quote">The HF trans is junk for anything performance oriented and yor assumption of more boost with a longer geared trans is incorrect, get an LSD ZC trans or a hybrid trans with an aftermarket LSD</TD></TR></TABLE>

Well, I talked to the guys at effinmotorworks.com and I'm probably gonna have them set up custom gears for me along with carbon synchros and lsd. Cuz there is no way I'm gonna be using my zc the way it is. Hittin redline (7k) at only 115 mph isn't gonna fly... Thanks for all the imput guys! Appreciate it!

 

Longer gearing is only good if you can make low end power..

 

The reason people say that long trannies are good when you have more power is based more on old ways - mainly v8's. Slushboxes back then could be modified to shift lightning-fast (my th350 3spd in my '67 chirps 3rd with only a stage1 B&M), and based on how my mom's '67 vette's cable tranny is a bitch - easier to use. There's also the fact that more torque meant more displacement - which usually ment lower redline (with all things being equal).

The fact is that in the quarter mile, its best to have your car almost redlining in 4th at the 1320 mark. The ZC and SI tranny would be nearing 110 with small tires in the top of 4th, IIRC.


Try this with your numbers, see what you get.
http://crx.honda-perf.org/math/index.html

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Ace$nyper &raquo;</TD></TR><TR><TD CLASS="quote">longer gears for boost rumor must be stopped.

ZC </TD></TR></TABLE>

One can only try.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Ace$nyper &raquo;</TD></TR><TR><TD CLASS="quote">
Arn't some ZC trannies LSD or that just urban myth? </TD></TR></TABLE>

Some DOHC ZC engines (and only this engine, not sure which years) had an optional LSD. i remember that.

Out of the two choices, ZC and low boost or HF and high boost, I say Zc and low boost.

But why not get the ZC tranny with high boost?

 

So I have another question. What transmission do I have??? because I rip through the gears extremely quick and in 5th gear I'm already at 7k at only 115 mph. And that tranny calc. says that in 5th gear at 7k I should be at like 140 mph with a zc tranny. So, I'm confused... (not suprising I know)

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by QuarterMileMaster &raquo;</TD></TR><TR><TD CLASS="quote">So I have another question. What transmission do I have??? because I rip through the gears extremely quick and in 5th gear I'm already at 7k at only 115 mph. And that tranny calc. says that in 5th gear at 7k I should be at like 140 mph with a zc tranny. So, I'm confused... (not suprising I know)</TD></TR></TABLE>

maybe a hybrid zc/si??? man those are like the b-series j1 tranny speeds....what size tires like 10's lol, with my crx si tranny i was maxing 3rd out at about 95-97mph.

edit btw that was with 195/60/14

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Mach69 &raquo;</TD></TR><TR><TD CLASS="quote">

One can only try.

Some DOHC ZC engines (and only this engine, not sure which years) had an optional LSD. i remember that.

Out of the two choices, ZC and low boost or HF and high boost, I say Zc and low boost.

But why not get the ZC tranny with high boost?</TD></TR></TABLE>
not to call bs but I've heard it just never seen it if you or somone could get a pic to make me happy i'd be thrilled.

I've heard yes and no on dohc zc lsd trannies from many great members here.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Bserieskllr &raquo;</TD></TR><TR><TD CLASS="quote">

maybe a hybrid zc/si??? man those are like the b-series j1 tranny speeds....what size tires like 10's lol, with my crx si tranny i was maxing 3rd out at about 95-97mph.

edit btw that was with 195/60/14</TD></TR></TABLE>

I don't think it's a hybrid because I got it from Hmotors and usually the zc/si hybrids have higher top speeds not lower. My tires are 205/50/15's btw. I heard of a possibilty that there is a rare zc with si gears and a 4.44 final drive. That's the only thing that would really make sense at this point. Anybody else got any useful info??

 

on my 91 DX I hit 100 in 5th at 4500rpm
I jumps off the line too
made my buddy with a mint 91 SI go WOW
It goes to 6k w/o fuel cutoff too

BTW it is a JDM D15B

not doing qtr miles though
just DD

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by QuarterMileMaster &raquo;</TD></TR><TR><TD CLASS="quote">So I have another question. What transmission do I have??? because I rip through the gears extremely quick and in 5th gear I'm already at 7k at only 115 mph. And that tranny calc. says that in 5th gear at 7k I should be at like 140 mph with a zc tranny. So, I'm confused... (not suprising I know)</TD></TR></TABLE>

Thats pretty odd. Obviously its not the Hf tranmission, that thing can go to 170. (its exageration of how high its geared).

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Ace$nyper &raquo;</TD></TR><TR><TD CLASS="quote">
not to call bs but I've heard it just never seen it if you or somone could get a pic to make me happy i'd be thrilled.

I've heard yes and no on dohc zc lsd trannies from many great members here.

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

I wish I could prove it to you man, I really do. I remember reading it on a site somewhere, but that was so long ago that there is no way I can get back to it. I don't even know if that site was 100% accurate. I do remember reading it though. You can contact hmotors to see if they have ever had an oem LSD equipped dohc zc transmissions.

 

Here is some info on the L# JDM ZC tranny. It does exist!!
<A HREF="http://tjshondas.20m.com/l3.htm#noise
" TARGET="_blank">http://tjshondas.20m.com/l3.htm#noise
</A>

 

go with the zc tranny with the si 5th and final drive

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Ace$nyper &raquo;</TD></TR><TR><TD CLASS="quote">
not to call bs but I've heard it just never seen it if you or somone could get a pic to make me happy i'd be thrilled.

I've heard yes and no on dohc zc lsd trannies from many great members here.</TD></TR></TABLE>

ZC w/LSD does exist, I had one that I recently sold to a member on this board.

 

It'd be really great if I could figure out what kind of transmission I have, it's driving me nuts...

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by QuarterMileMaster &raquo;</TD></TR><TR><TD CLASS="quote">It'd be really great if I could figure out what kind of transmission I have, it's driving me nuts...</TD></TR></TABLE>

Are there any numbers or stamps on the transmission. Something like L3xxxx?