trooper0641

Which one?

bagpipe goatee

i believe theyre not too far off, i remember a couple threads on this like a week and a half ago. basically, the zc has close gears themselves but the differential is the same as the dx tranny, and the si has the same gears as the dx tranny, but a shorter differential, so if you take the si differential and put it in the zc, you have a pretty short transmission.

zccr-xsi

ok the si l3 is the best for accl. the dx is 4 speed which would be great for turbo.the zc is same as the si tranny but longer 5th gear if u put the 5 from the zc in the si tranny that is the best for the zc.now it also depnds on what u going top be doing drag racing raod racing autocross then ull have to play with trannys and gears.but for all round daily driver i would go with the l3 with zc 5th gear in it.

4drEF

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by vteckillenzc &raquo;</TD></TR><TR><TD CLASS="quote">ok the si l3 is the best for accl. the dx is 4 speed which would be great for turbo.the zc is same as the si tranny but longer 5th gear if u put the 5 from the zc in the si tranny that is the best for the zc.now it also depnds on what u going top be doing drag racing raod racing autocross then ull have to play with trannys and gears.but for all round daily driver i would go with the l3 with zc 5th gear in it.</TD></TR></TABLE>

Why do you say a DX tranny is better for turbo?
Just so you can stay in boost longer and not shift as much?
AFAIK that doesn't exactly mean you go faster.

I have an Si L3 with ZC 1~5 gears in it.
I would not recommend putting ZC 5 in with the Si FD if you plan to do any freeway commuting.
At 70 mph with 15" wheels I'm revving over 3,500 RPM. At 80 it's up at the 4,000 mark.
The good side is that the car RIPS through all the gears!
Acceleration is better than just a stright Si tranny.

The 'best' combo I have read about so far is the Si FD and gears except swap out 3rd and 4th for the ZC ones.
That keeps it nice and tight along with decent freeway cruising.

QuarterMileMaster

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by bagpipe goatee &raquo;</TD></TR><TR><TD CLASS="quote">i believe theyre not too far off, i remember a couple threads on this like a week and a half ago. basically, the zc has close gears themselves but the differential is the same as the dx tranny, and the si has the same gears as the dx tranny, but a shorter differential, so if you take the si differential and put it in the zc, you have a pretty short transmission.</TD></TR></TABLE>

First off, quit saying differential. I think what you mean is FINAL DRIVE. And the dx and si tranny's are closer than the dx and zc. I've had experience with all four types (dx/5spd, std/4spd, si/5spd, zc/5spd). If you want the best stock tranny for accelleration go to http://www.hmotorsonline.com and buy their version of the zc tranny. It's actually a rare form of the zc with the si gears but a HUGE 4.43 final drive (si final drive: 4.25) and it's only $50. The si tranny is ok but still too long if you want hard accelleration. Now, if you want the best tranny you can get and don't mind paying $600, then go to http://www.effinmotorworks.com and get them to build you a zc/si hybrid. With that tranny you have the typical zc gears (which are evenly spaced ) for 1st-4th. Then they use the si 5th gear and FINAL DRIVE to create hella accelleration but you still have good top speed as well.

jlicrx

to answer the original question - the Si transmission (with final drive factored in) has shorter 1 thru 3 gears - the ZC (with final drive factored in) is shorter in 4th and 5th

Si - 13.81 - 8.05 - 5.35 - 3.98 - 3.28
ZC - 12.63 - 7.56 - 5.22 - 4.01 - 3.41

trooper0641

so...the zc tranny is shorter than the si tranny? which one are we talking about the dohc zc or the sohc zc? does it make a difference? I just want the shortest gear ratios possible.

SwissChEz82

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by trooper0641 &raquo;</TD></TR><TR><TD CLASS="quote">so...the zc tranny is shorter than the si tranny? which one are we talking about the dohc zc or the sohc zc? does it make a difference? I just want the shortest gear ratios possible.</TD></TR></TABLE>

I'm pretty sure they're the same. You can find the ratios here:

http://www.thezcr.com/modules....cat=5

davens

Effinmotorworks is no longer offering hybrid transmissions. We are filling exisiting orders but after that, no more. Try Gearspeed.

For the best acceleration:
dohc ZC 1-4, Si 5th and Si final drive

A stock ZC vs a stock Si...neither one is better then the other.

ExospeedAMcrx

before you guys buy a ZC tranny.
theres different ZC trannies that we've encountered.

We bought 7 ZC transmissions last year and opened them all up. checking the gears and FD that come in them.

1. ZC transmission with OEM LSD
- contained Stock USDM Si gears with a 4.4 FD

2. ZC trans
- contained "ZC" gearset with 3.88 FD
-this is the desired gearset but not the FD

3. ZC trans
- contained the USDM Si gearset but with 4.4 FD


What we did was use the ZC gearset with our Houseman 4.6 FD
and installed a Quaife LSD for our CRX

SwissChEz82

Is there any external methods of telling what's inside?

ExospeedAMcrx

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by SwissChEz82 &raquo;</TD></TR><TR><TD CLASS="quote">Is there any external methods of telling what's inside?</TD></TR></TABLE>

I thought there was from certain #s on the casing, but our theories were wrong.

QuarterMileMaster

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by davens &raquo;</TD></TR><TR><TD CLASS="quote">Effinmotorworks is no longer offering hybrid transmissions. We are filling exisiting orders but after that, no more. Try Gearspeed.

For the best acceleration:
dohc ZC 1-4, Si 5th and Si final drive

A stock ZC vs a stock Si...neither one is better then the other. </TD></TR></TABLE>

Why aren't they doing the hybrid tranny's anymore??

davens

We're not going to do them as a regular off the shelf service anymore. There's several reasons as to why...supply/demand vs cost, availability of zc cores, etc.
We'll still build them under very specific circumstances. If you're really serious about wanting one, I'll go into details...contact me via the email link off of our homepage.

Joey Scheffler

I have no problem with a zc 5th gear I'm running 70mpg at about 2,900rpm and 80 mph is 3,300. I don't know how many zc trans you have driven but I have a lower Rpm then you do. Amazingly it's pretty awesome to have that ability because I can get to my gears way better. Just would like a 6th gear to lower the rpms a little more in a chance to create better fuel economy at 70-80mph. I'm also running the 14inch stock wheels😂

Bently_Coop

Twelve year thread bump.

@4drEF

4drEF

Why

4drEF

I was on 16's and what you are describing makes me wonder.
is your ZC a DOHC ZC trans?
Did you swap out the final drive?