Home / Toyota Supra Forums

Go Back   Toyota Supra Forums! Join the Supra forum! > Performance, Modification, and Maintenance Forums - for generation specific discussions > MKIII Supra

Reply
 
Thread Tools Display Modes
Old 12-29-2012, 03:57 PM   #1
907mge
20psi boost
 
907mge's Avatar
 
Join Date: Dec 2009
Location: Harrisburg
Posts: 759
907mge is on a distinguished road
Default Whats LSD ratio came in what supra?

I was wondering what my 90 NA auto should have in it? I would like to put in an lsd but am a little unsure what is in it now for the open diff. Also I have a 3.9 and 4.3 any recommendations on the that?
907mge is offline   Reply With Quote
Old 12-29-2012, 08:50 PM   #2
Sonyps307
Lexus & 550's
 
Join Date: May 2010
Location: Baltimore
Posts: 526
Sonyps307 is on a distinguished road
Default

My 89 na has the 4.3 LSD rear in it.
Sonyps307 is offline   Reply With Quote
Old 12-30-2012, 12:06 AM   #3
cre

Toyota
Racing
Development
 
cre's Avatar
 
Join Date: Apr 2007
Posts: 5,036
cre has a reputation beyond reputecre has a reputation beyond reputecre has a reputation beyond reputecre has a reputation beyond reputecre has a reputation beyond reputecre has a reputation beyond reputecre has a reputation beyond reputecre has a reputation beyond reputecre has a reputation beyond repute
Default

All N/A's came with a 4.30:1 open or the optional 4.30:1 LSD.
'87 and '88 Turbo models came with a 3.91:1 LSD.
'89 through '92 Turbo models came with a 3.73:1 LSD.

There was an optional Torsen differential offered only on 1JZ models (JDM only) I can't remember the ratio.
__________________
If something breaks or you need to contact a member of the administration please post HERE. Unless it's a private or administration matter please post it on the forum. It benefits no one else if car related questions aren't posted for future users and takes away from the time I'm able to spend helping on the rest of the forum.

If you're so inclined I'm always more than happy to accept tips via PayPal.
Tip Jar --->
cre is offline   Reply With Quote
Old 12-30-2012, 02:46 PM   #4
907mge
20psi boost
 
907mge's Avatar
 
Join Date: Dec 2009
Location: Harrisburg
Posts: 759
907mge is on a distinguished road
Default

Ok, thank you. Would there be any benefit to switching to a 3.9?
907mge is offline   Reply With Quote
Old 12-30-2012, 10:52 PM   #5
cre

Toyota
Racing
Development
 
cre's Avatar
 
Join Date: Apr 2007
Posts: 5,036
cre has a reputation beyond reputecre has a reputation beyond reputecre has a reputation beyond reputecre has a reputation beyond reputecre has a reputation beyond reputecre has a reputation beyond reputecre has a reputation beyond reputecre has a reputation beyond reputecre has a reputation beyond repute
Default

Well, you'll see somewhat better highway cruising mileage but beyond that it depends largely on your driving style. Your city and aggressive driving mileage will most likely take a hit as your acceleration will be worse and you'll have to apply more throttle or you'll have to stand on the throttle longer to reach any given speed. If you're a laid back, 'I'll get there when I get there' sort of driver and you want a mild improvement in mileage then go for it. The mileage improvement isn't huge. The LSD is definitely worth having over the open diff in most cases but you might want to see if you can find a 4.30:1 LSD from another N/A first.

Your speedometer and odometer will be off unless you swap in the speedo drive gear from an auto equipped MKIII. The speedo drive gears from the W58, the R154 and the A340E are not interchangeable.
__________________
If something breaks or you need to contact a member of the administration please post HERE. Unless it's a private or administration matter please post it on the forum. It benefits no one else if car related questions aren't posted for future users and takes away from the time I'm able to spend helping on the rest of the forum.

If you're so inclined I'm always more than happy to accept tips via PayPal.
Tip Jar --->
cre is offline   Reply With Quote
Old 12-31-2012, 02:54 AM   #6
907mge
20psi boost
 
907mge's Avatar
 
Join Date: Dec 2009
Location: Harrisburg
Posts: 759
907mge is on a distinguished road
Default

Yeah you confirmed what I was thinking. I do have a nice 4.3 that I think I will use then. Thanks
907mge is offline   Reply With Quote
Reply

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
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Forum Jump

Similar Threads
Thread Thread Starter Forum Replies Last Post
Begginer to SUPRA and cars, I GOT A FREE SUPRA, PLEASE HELP!! 89MkiiiSupra Non-Generation Specific Questions 5 06-01-2010 06:48 AM
Kill Board! Isphius Show n Tell 95 01-25-2010 05:05 AM
Questions about MKIV Supra ukno0003 MKIV Supra 5 11-06-2008 10:53 AM
Dream Offer Karma_Supra MKIV Supra 22 10-17-2007 03:04 PM
new here and thinking about getting a Supra WhisPer MKIV FAQ 20 03-17-2007 01:35 PM


All times are GMT. The time now is 05:16 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2020, vBulletin Solutions, Inc.

1986



1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87