Specifications of stock d14 gearboxes

[saxophonias]

There several stock transmission combos, available for d14 which were mounted in different honda chassis. In this topic everything about gear ratios and final drives available.

[saxophonias]

Gear ratios are probably the most important thing to make you go fast. Depending on the tuning stage there is the appropriate gearbox to match the power and torque curve. Let us mention the stock numbers

[edit by Dodo]Sorry to be obnoxious, but I rather give my verified specs first and not only in the 7th page of this topic
1st 12 - 39 => 39/12 = 3.250
2nd 22 - 42 => 42/22 = 1.909
3rd 28 - 35 => 35/28 = 1.250
4th 33 - 30 => 30/33 = 0.909
5th 36 - 27 => 27/36 = 0.750 <--- yup!

Final 17 - 69 => 69/17 = 4.059

Reverse 13 (- 29) -41 => 41/13 = 3.154 <--- for if you ever wondered

Verified by opening up my own D14A3 1998 Civic City (1.4i) transmission, perhaps not the truth for everybody, but I guess the 5th gear is important to note for many of us. End of obnoxiousness.
[/edit by Dodo]

D14A3/4 Z2/3 GEARBOX
1--3,250:1
2--1,909:1
3--1,250:1
4--0,909:1
5--0,702:1
FD--4,058

And this is the gearbox of the other d14 engines met on M series
http://img268.imageshack.us/img268/2447/gearboxn.jpg
Practically the d14a8 gearbox has shorter 1st, sligtly 2nd and 3rd and vastly shorter 4rth and 5th. Have a look

D14a4 D14a8
1-- 58 50
2-- 98 95
3-- 150 145
4-- 207 185

I have swapped the d14a8 gearbox which is not ontly shorter but closer as well and i am very happy with it. Pull at low and mid revs is like dream. This was the major drawback a4 gearbox. All gears drop at 5000rpms after shifting slightly before the rev limiter and when changing from 3rd to 4rth revs drop at 5900! If your engine has a lot of power at the end of the powerband then you will feel great difference.
Have a look

This is my stock d14a4 gearbox. See km per gear and revs.
http://www.youtube.com/watch?v=E_wPsVJz7_U

This is the stock d14a8 gearbox on my ej9
http://www.youtube.com/watch?v=covtr4cC6L0

These 2 videos are captured on the same place, same conditions.

Here watch the shift from 3rd to 4rth
http://www.youtube.com/watch?v=U-4bEEJWXis

[baz]

Wow, didnt knew that!

I will keep that in mind for my upcomming project

[mynameisowen]

wow that is a big difference, i will deffinately consider swapping for an A8 box, any complications with the swap??

[saxophonias]

if you can get your hands on one for a decent price it will be good. You can still swap the d13 civic dx eg version. It's a good option, same final drive shorter 2nd and 3rd but not so good 4rth and 5th. Another drawback is that it's older and its fork is not so strong as the ek s40 versions.

[Dodo Bizar]

Some D14, at least D14A3 have better final gear, I got 4.250.

[nope] edit in 2015: counted teeth now and it is 4.059 (the 4.058 is actually 69/17 is 4.05882353 which I round up to 4.059 rather . [/nope]

[mynameisowen]

how do you know what your final ratio is joris?

[Dodo Bizar]

With the speed/tyre ratio calculators out there I confirmed it (including calibration errors of gauges).

Easiest way approximatly is to check speeds in 5th gear at 4000 rpm. If you have 140km/h like my you got probably the 4.250 ratio. If you only rev 3800 you got the 4.058 probablly. Things are a bit flaky since you need to know your error in the speedometer and rev meter as well. I happened to do so since I datalog rev and have a speedometer calibration done at this dyno-centre were I usually go. Turned out I had an 6/7% gain on it.

[nooooooooooooooooope] see 2 messages earlier, in 2015 I finally opened up the tranny and counted teeth, for some reason I apparently can't calibrate for shit [/nope]

[mynameisowen]

cool man nice job

[Law_]

With the speed/tyre ratio calculatros out there I confirmed it (including calibration errors of gauges).

Easiest way approximatly is to check speeds in 5th gear at 4000 rpm. If you have 140km/h like my you got probably the 4.250 ratio. If you only rev 3800 you got the 4.058 probablly. Things are a bit flaky since you need to know your error in the speedometer and rev meter as well. I happened to do so since I datalog rev and have a speedometer calibration done at this dyno-centre were I usually go. Turned out I had an 6/7% gain on it.

Mine based on this is 4.058.
At 140km/h i have 135km/h with 175/70/R13 Tyres.
GPS measures give an 8km/h excess at this speed.
Very anoying that error...
French cars like Citroen and Peugeot dont used to have it but it is common in Japanese / German cars.
Cheers