Calculating Final Drive on an unknown transmission - D-series.org

Go Back   D-series.org Motor Mayhem & Suspension Satisfaction Transmission alley

D-Series.org is the premier Honda All Forum on the internet. Registered Users do not see the above ads.
Reply
 
LinkBack Thread Tools Display Modes
Old 05-02-2005, 04:39 PM   #1 (permalink)
stickershop
Guest
 
Posts: n/a
Default Calculating Final Drive on an unknown transmission

How does one calculate the final drive on an unknown tranny without opening the case and counting teeth?

I know that some people rotate the input shaft 10 times and see how far the differential has turned. As far as I know, all 1st gears on the L3 transmissions (88-91) are 3.250. How does the math behind that work?

10/3.250/(final drive ratio) = (rotations of differential)?
  Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
Old 05-02-2005, 06:35 PM   #2 (permalink)
Brokedick Millionaire
 
transzex's Avatar
 
iTrader: (59)
Join Date: Dec 2003
Location: Cincity OH
Posts: 40,195
Rep Power: 108 transzex is on a level you can only DREAM about! ! !transzex is on a level you can only DREAM about! ! !transzex is on a level you can only DREAM about! ! !transzex is on a level you can only DREAM about! ! !transzex is on a level you can only DREAM about! ! !
transzex is on a level you can only DREAM about! ! !transzex is on a level you can only DREAM about! ! !transzex is on a level you can only DREAM about! ! !transzex is on a level you can only DREAM about! ! !transzex is on a level you can only DREAM about! ! !transzex is on a level you can only DREAM about! ! !transzex is on a level you can only DREAM about! ! !transzex is on a level you can only DREAM about! ! !transzex is on a level you can only DREAM about! ! !transzex is on a level you can only DREAM about! ! !transzex is on a level you can only DREAM about! ! !transzex is on a level you can only DREAM about! ! !
iTrader Score: 59 reviews
Default

use 5th gear..........that helps 2 ways...............

First, you could have a STD 4 speed tranny, no 5th!!!!!!!!! dead give away.
Second, if it is a HF tranny, it will be very evident!!!!!!!!

10 / 5th / FD = xxxx

HF
10 / .694 / 3.250 = 4.43 turns of the diff

DX
10 / .771 / 3.889 = 3.33 turns of the diff

Si (big bearing case)
10 / .771 / 4.25 = 3.05 turns of the diff

Now the key is to reverse engineer.

5th gear, 10 turns, # of diff turns, figure out what is closest.
__________________
Mista Bone



To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.


Quote:
Originally Posted by patprimmer RIP
I will always feed an inquisitive mind, prod a lazy noob and blast a disrespectful bum.
transzex is offline   Reply With Quote Quick reply to this message
Old 05-03-2005, 02:36 PM   #3 (permalink)
stickershop
Guest
 
Posts: n/a
Default

Ok...so an SOHC ZC from a ZXi would be:

10 / .771 / 4.437 = 2.92 turns of the diff

And a normal ZC would be:

10 / .878 / 3.888 = 2.93 turns of the diff


Hmmm... I'm guessing first gear is the way to go on that set of transmissions.

ZXi in 1st

10 / 3.250 / 4.437 = 0.69 turns of the diff

ZC in 1st

10 / 3.250 / 3.888 = 0.79 turns of the diff

Possibly using even more turns of the input shaft to separate out the results a bit more?
  Reply With Quote Quick reply to this message
 
Old 05-03-2005, 03:54 PM   #4 (permalink)
 
iTrader: (0)
Join Date: Nov 2003
Posts: 643
Rep Power: 0 HumanResource is trying to make new friends
iTrader Score: 0 reviews
Default

Dab some white out on the diff and case at 12oclock
dab some white out on the input shaft and the case at 12
put it in 2nd

spin input shaft 10 times
if it's 0:15 Min it's an Si 4.25 FD (these came on some of the larger diff trans)
a lil before than it's ZXi 4.437 Territory
A lil after that it's DOHC ZC 3.88 territory

I got a DOHC ZC and the SOHC ZXi, now who's gonna help me swap gears???
HumanResource is offline   Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the D-series.org forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in



Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Display Modes

Posting Rules
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


iconAll times are GMT -8. The time now is 08:47 AM. | Welcome to Forum, please register to access all of our features.