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Discussion Starter #1 (Edited)
Hey everyone.

I've been planning this transmission build for a number of months now and finally it's done!

I've been using an S40B000 5-speed, stock gearing with a Quaife LSD in my '93 del Sol Si since I converted from auto to manual some time back in 2012 (or 2013… I don't remember).

I'm nearing the end of a head build and wanted a transmission with tighter ratios to complement the performance of the engine and suspension at the track. The RPM drop between 2nd and 3rd was pretty significant.

So I did this.

Here's the stock S40B000 gearing:
1. 3.250
2. 1.909
3. 1.250
4. 0.909
5. 0.702
FD. 4.25

Here's what it is now:
1. 3.250 (stock)
2. 1.909 (stock)
3. 1.565 (MFactory)
4. 1.250 (stock 3rd)
5. 0.878 (ZC)
FD. 4.25 (stock)

It's also been rebuilt using the Synchrotech Carbon Synchro rebuild kit.
http://shop.synchrotech-transmissions.com/89-00-Carbon-Rebuild-kit-40mm-BSK-SYN111-D16.htm

Here it is, dressed in gloss black, all tucked into the back of the Jeep:


I just dropped it off at my mechanic's shop earlier this evening. The car should be ready this weekend.

Thanks to Phil from Barrie for the exceptional work! Phil is a transmission artist and I would highly recommend him to anyone. An especially big THANK YOU goes to Kyle (bake82) for the referral.

Here's a link to the car build.

Videos to follow!!
 

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Brokedick Millionaire
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40,252 Posts
ZC = .878

I don't like the spacing of MF 3rd...

Kyle is a dick :)

I love ZC gears...

Depending on use, close ratios might make the car slower, say at Mid Ohio. Those extra 6 shifts per lap take time. Without that time lost, customer reset class track record not long ago.
 

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Discussion Starter #3 (Edited)
ZC = .878

I don't like the spacing of MF 3rd...

Kyle is a dick :)

I love ZC gears...

Depending on use, close ratios might make the car slower, say at Mid Ohio. Those extra 6 shifts per lap take time. Without that time lost, customer reset class track record not long ago.
Good morning Mista Bone! (It's 6am... I'm "risin' 'n shinin'")

I always look forward to your input. Thank you for the correction of the ratio for the ZC 5th. I'll edit my post.

Don't hate on Kyle just because he's from Ottawa... ;)

I'd find a significant drop between stock 2nd and 3rd when at the track. I had limited my previous engine set up to 7200rpm due to the stock valves and springs and stage 2 camshaft to avoid valve float. You can hear the difference between 2nd and 3rd in this 2015 video I took at the Canadian Tire Motorsport Driver Development Track - a short technical track.
https://youtu.be/ghQfQurCIU8

But I understand what you're saying by losing time and speed with more frequent shifts.

Compare that with 2013 at the International Raceway (a much longer and faster track) at the same park in 2013 with the stock transmission and stock engine. I would barely get to the end of 3rd near the end of the back straight. If I can remember correctly, it's a 2 mile straight with a 230' incline. The limited power didn't help.
https://youtu.be/0e2ZTzTcRUw

Given the new engine set-up (I've had a P&P head built with Rocket Motorsports stage 4 cam, valve springs and Ti retainers to go with the 75.5mm P29's) and the new tune I'll be getting with higher redline than the conservative 7200rpm I was running, I'm certain the car will perform better at the track. As for the driver...
 

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ZC = .878

I don't like the spacing of MF 3rd...

Kyle is a dick :)

I love ZC gears...

Depending on use, close ratios might make the car slower, say at Mid Ohio. Those extra 6 shifts per lap take time. Without that time lost, customer reset class track record not long ago.
Since zc gears are so hard to find I was thinking about doing something like
y8 trans
mfactory 1st
oem 2nd
mfactory 3rd
1.066 (I think is the number) 4th
oem 5th
4.25 FD
225/45/15 tires

These drops seem decent, I think its better than making oem 3rd the 4th gear, 90 mph topped out in 4th sounds horrible.
 

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a 3.722 HX final with a 1.00 5th gear is an overall ratio of 5th gear ratio of 3.722:1

Your overall 5th gear ratio is 3.7315.

I'd suggest running a 4.058 final with a 1.00 5th, or a 3.7222 final with the 1.000 5th.
 

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I love ZC gears...
if you're still talking about zc gears in 10 years i swear im going to buy you a old accord sohc and put a 5g prelude trans in it with a 4g prelude vtec 5th lol


------ zc ---- h22
1st - 3.250 --- 3.285
2nd - 1.944 --- 1.957
3rd - 1.346 --- 1.345
4th - 1.033 --- 1.034
5th - 0.878 --- 0.871
fnl -- 4.250 --- 4.266
 

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Brokedick Millionaire
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40,252 Posts
Stock ZC three speed trans (1-3-5) during normal daily drive, 48 mpg if I keep up at 65 mph on the highway.

I would like to try a 1988 3.722 FD in this trans, or a .771 5th.

Mind you, customers of mine are testing at Indy soon for 2017 SCCA Runoffs to seek gearing options while I'm still busting ass to get 2016 Runoffs transmissions ready.
 

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I've tried a lots of transmission combos.

I would never use the .702 for anything, practically worthless.

.771 is a lot nicer, and 1.00 with a 4.0 or 3.7 is nice too. Longer FD makes the 1.565 more useful too.

1-2 has always been a shitty gear change. Sometimes a just say screw it an use the 1.7 2nd with 1.25 or 1.34 3rd to help it out.

Wheres the ZC3-4 reproductions or the new 2nd gears
 
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