Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

Go Back   Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum > General > Tech Talk

Tech Talk Technical Discussion About The Nissan 240SX and Nissan Z Cars


Reply
 
Thread Tools Display Modes
Old 08-29-2019, 10:41 AM   #1
Tieny
 
Join Date: Jul 2014
Location: DMV
Posts: 15
Trader Rating: (0)
Tieny is an unknown quantity at this point
Feedback Score: 0 reviews
Which transmission is this?

I've been trying to figure out where this tranny came from for the longest time. It has three sensors on it (Neutral, OD, and Reverse). So I'm thinking its an s14 tranny, BUT... there is no hole on top of the bell housing for the CrankShaft Position Sensor. Is this an s14 or s13 tranny? Also this it labeled TA-71B #2.
Tieny is offline   Reply With Quote
Sponsored Links
Old 09-06-2019, 06:45 AM   #2
jr_ss
Post Whore!
 
Join Date: Dec 2005
Location: Pa
Posts: 6,410
Trader Rating: (35)
jr_ss has a reputation beyond reputejr_ss has a reputation beyond reputejr_ss has a reputation beyond reputejr_ss has a reputation beyond reputejr_ss has a reputation beyond reputejr_ss has a reputation beyond reputejr_ss has a reputation beyond reputejr_ss has a reputation beyond reputejr_ss has a reputation beyond reputejr_ss has a reputation beyond reputejr_ss has a reputation beyond repute
Feedback Score: 35 reviews
Send a message via AIM to jr_ss
How about a picture? You describe what could be hundreds of transmissions. Try again.
__________________
*My SR20VET* Does your VTC gear rattle in your S14/15 SR? PM me.
jr_ss is offline   Reply With Quote
Old 09-06-2019, 07:52 AM   #3
Tieny
 
Join Date: Jul 2014
Location: DMV
Posts: 15
Trader Rating: (0)
Tieny is an unknown quantity at this point
Feedback Score: 0 reviews
Hundreds? Probably more like two or three... If ya'll really knew about these transmissions, all the information I gave to identify it should be right there to figure it out.

From what I searched and found so far:
S13 transmissions usually have 4 sensors on it. (Neutral, OD, TOP, and Reverse)
S14 transmission usually have 3 sensors on it. (Neutral, OD, and Reverse)

One difference is that the S14 trannys have the hole on top of the bellhousing for the crank position sensor. This is the reason you can't use an S13 tranny in an S14 chassis without throwing a code unless you drill that hole in.

So yeah this thing I'm trying to figure out: I have 3 sensors on mine (probably came from an S14 right?) But I don't have the crank position hole slot (wait, it can't be from an S14 then...?) Hmm.. maybe someone swapped the bellhousing (nope can't be.. its definitely a KA housing and the sensor that's different is on the same front half as the housing)
Maybe there was an older type S14 that didn't the bellhousing crank position? Or maybe from a later model type S13 that started transition? The model number should tell exactly where it came from (TA-71B #2), but seems there's nothing on google about the #2 type...
Tieny is offline   Reply With Quote
Old 09-06-2019, 08:01 AM   #4
tuzzio
Post Whore!
 
tuzzio's Avatar
 
Join Date: Oct 2013
Location: Western Mass.
Posts: 2,603
Trader Rating: (3)
tuzzio is close to perfectiontuzzio is close to perfectiontuzzio is close to perfectiontuzzio is close to perfectiontuzzio is close to perfectiontuzzio is close to perfectiontuzzio is close to perfectiontuzzio is close to perfectiontuzzio is close to perfectiontuzzio is close to perfectiontuzzio is close to perfection
Feedback Score: 3 reviews
The time it would've taken to post a picture is the same amount of time it would've taken to not be a dick. That attitude won't last long around the zilvia vultures.

You're asking for help. Provide the information asked for.

Try again.
tuzzio is offline   Reply With Quote
Old 09-06-2019, 08:37 AM   #5
Tieny
 
Join Date: Jul 2014
Location: DMV
Posts: 15
Trader Rating: (0)
Tieny is an unknown quantity at this point
Feedback Score: 0 reviews
Hey wasn't trying to be a dick. Jeez I even reworded that so many times without trying to sound like a dick too... =/

Can't upload photos, its been giving me errors even though the image is like a 50kb jpeg..
Tieny is offline   Reply With Quote
Old 09-06-2019, 10:05 AM   #6
tuzzio
Post Whore!
 
tuzzio's Avatar
 
Join Date: Oct 2013
Location: Western Mass.
Posts: 2,603
Trader Rating: (3)
tuzzio is close to perfectiontuzzio is close to perfectiontuzzio is close to perfectiontuzzio is close to perfectiontuzzio is close to perfectiontuzzio is close to perfectiontuzzio is close to perfectiontuzzio is close to perfectiontuzzio is close to perfectiontuzzio is close to perfectiontuzzio is close to perfection
Feedback Score: 3 reviews
www.imgur.com
tuzzio is offline   Reply With Quote
Old 09-06-2019, 01:32 PM   #7
jedi03
Nissanaholic!
 
Join Date: Jul 2008
Location: albuquerque
Posts: 1,836
Trader Rating: (8)
jedi03 is on a distinguished road
Feedback Score: 8 reviews
lol many transmissions look similar to description@ but you try googling the numbers
jedi03 is offline   Reply With Quote
Old 09-15-2019, 12:22 PM   #8
Kingtal0n
Post Whore!
 
Kingtal0n's Avatar
 
Join Date: Jul 2005
Location: South Florida
Age: 40
Posts: 4,827
Trader Rating: (17)
Kingtal0n has a reputation beyond reputeKingtal0n has a reputation beyond reputeKingtal0n has a reputation beyond reputeKingtal0n has a reputation beyond reputeKingtal0n has a reputation beyond reputeKingtal0n has a reputation beyond reputeKingtal0n has a reputation beyond reputeKingtal0n has a reputation beyond reputeKingtal0n has a reputation beyond reputeKingtal0n has a reputation beyond reputeKingtal0n has a reputation beyond repute
Feedback Score: 17 reviews
Send a message via AIM to Kingtal0n
you can get two different 5-speeds in the same year

some have reverse synchros, some not,
some have different 5th gear ratios
some have updated shift fork hardware
silvia trans is similar to but many differences from KA trans including synchro rings

The only really important thing that makes any difference is the gear ratio of 5th, and the fork if you can get the good ones, or install a good 5th fork (they break and lead to infamous 5th grind)
The s13 trans have shorter ratios, the S14 trans has a better cruise ratio, so we always want the identify and use the better overdrive for economy

spin output shaft vs input shaft and try to identify the ratio of 5th
Kingtal0n is offline   Reply With Quote
Old 09-16-2019, 10:46 AM   #9
duballstar37
Zilvia Junkie
 
duballstar37's Avatar
 
Join Date: Aug 2007
Location: Eastbound and Down
Posts: 495
Trader Rating: (10)
duballstar37 is on the path to ruinduballstar37 is on the path to ruinduballstar37 is on the path to ruin
Feedback Score: 10 reviews
Quote:
Originally Posted by Kingtal0n View Post
you can get two different 5-speeds in the same year

some have reverse synchros, some not,
some have different 5th gear ratios
some have updated shift fork hardware
silvia trans is similar to but many differences from KA trans including synchro rings

The only really important thing that makes any difference is the gear ratio of 5th, and the fork if you can get the good ones, or install a good 5th fork (they break and lead to infamous 5th grind)
The s13 trans have shorter ratios, the S14 trans has a better cruise ratio, so we always want the identify and use the better overdrive for economy

spin output shaft vs input shaft and try to identify the ratio of 5th
Can you please elaborate on the difference in gear ratios between S13 and S14 transmissions? I swapped a S14 KA trans onto my S13 SR (swapped the bellhousing) and the gearing felt identical.
__________________
P.A.T.T.
duballstar37 is offline   Reply With Quote
Old 09-17-2019, 05:43 AM   #10
jr_ss
Post Whore!
 
Join Date: Dec 2005
Location: Pa
Posts: 6,410
Trader Rating: (35)
jr_ss has a reputation beyond reputejr_ss has a reputation beyond reputejr_ss has a reputation beyond reputejr_ss has a reputation beyond reputejr_ss has a reputation beyond reputejr_ss has a reputation beyond reputejr_ss has a reputation beyond reputejr_ss has a reputation beyond reputejr_ss has a reputation beyond reputejr_ss has a reputation beyond reputejr_ss has a reputation beyond repute
Feedback Score: 35 reviews
Send a message via AIM to jr_ss
Quote:
Originally Posted by duballstar37 View Post
Can you please elaborate on the difference in gear ratios between S13 and S14 transmissions? I swapped a S14 KA trans onto my S13 SR (swapped the bellhousing) and the gearing felt identical.
All USDM transmissions have the .759 ratio for 5th or overdrive. The transmissions that back the Sr20de and DET come with varying 5th gears. Depending on what motor you have, some are .759(S13) and some are .838(S14/15).
__________________
*My SR20VET* Does your VTC gear rattle in your S14/15 SR? PM me.
jr_ss is offline   Reply With Quote
Old 09-17-2019, 11:34 PM   #11
Tieny
 
Join Date: Jul 2014
Location: DMV
Posts: 15
Trader Rating: (0)
Tieny is an unknown quantity at this point
Feedback Score: 0 reviews
Quote:
Originally Posted by duballstar37 View Post
Can you please elaborate on the difference in gear ratios between S13 and S14 transmissions? I swapped a S14 KA trans onto my S13 SR (swapped the bellhousing) and the gearing felt identical.
Gears 1-4 are identical between the KA and SR trans. The SR trans will have a slight higher gear ratio (0.838) than the KA trans (0.759) with a few exceptions in some Silvia models that also have an SR at 0.759. At highway cruising speed with the SR (0.838) you'll probably sit at a higher rpm compared with a KA (I wanna say probably about 300-500 rpms higher?)

If transmission is benched, one way to check is by marking a tooth on the output shaft. Put it in 5th gear and spin the input shaft one revolution. If the mark is now 7-8 teeth away from the original position it has a 5th gear ratio 0.759. If 4-5 teeth away, 0.838.


Quote:
Originally Posted by Kingtal0n View Post
you can get two different 5-speeds in the same year

some have reverse synchros, some not,
some have different 5th gear ratios
some have updated shift fork hardware
silvia trans is similar to but many differences from KA trans including synchro rings

The only really important thing that makes any difference is the gear ratio of 5th, and the fork if you can get the good ones, or install a good 5th fork (they break and lead to infamous 5th grind)
The s13 trans have shorter ratios, the S14 trans has a better cruise ratio, so we always want the identify and use the better overdrive for economy

spin output shaft vs input shaft and try to identify the ratio of 5th
While rebuilding my trans I found (at least on my model trans) that the only thing that actually engages 5th gear is a small retaining clip on the 5th fork rod. This clip is forced against the fork which engages the hub. It was somewhat warped, loose, and was free to spin. Once this clip breaks off it ends up getting incomplete 5th gear engagements.

My trans has a 0.759 gear and does not have a reverse synchro. After searching for a long while I haven't found any full rebuild tutorials anywhere on the net for a 240 transmission. I'm thinking of possibly making a video of a full teardown disassembly and rebuild.
Tieny is offline   Reply With Quote
Reply

Bookmarks


Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not 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

Forum Jump


All times are GMT -6. The time now is 06:37 AM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
vB.Sponsors
Copyright ? 1998 - 2022, Zilvia.net