2nd Generation Specific (1986-1992) 1986-1992 Discussion including performance modifications and technical support sections.
Sponsored by:

rear end strength?

Thread Tools
 
Search this Thread
 
Old 10-03-02, 11:44 PM
  #1  
I stretch 315/30/18

Thread Starter
 
projectsupramk3's Avatar
 
Join Date: Sep 2002
Location: Port St. Lucie, FL
Posts: 19
Likes: 0
Received 0 Likes on 0 Posts
rear end strength?

ok, so after going through about 7 pages of useless info from the search i'll have to post. does anyone know how much torque the s4 n/a rear end can handle, what about T2 and all the rest?
Old 10-05-02, 06:10 AM
  #2  
Lives on the Forum

 
RETed's Avatar
 
Join Date: Feb 2001
Location: n
Posts: 26,664
Likes: 0
Received 16 Likes on 15 Posts
Anything over 200lb-ft on a NA read diff is asking for trouble.
The turbo one can handle up to 350 lb-ft reliably.
Others will argue otherwise...


-Ted
Old 10-05-02, 09:45 AM
  #3  
Senior Member

 
incendui's Avatar
 
Join Date: Dec 2001
Location: Longmont, Co
Posts: 297
Likes: 0
Received 0 Likes on 0 Posts
well, right now i have the s5 na diff with a tII engine, and it seems to be handling it so far (previous owner did a half assed swap, how the driveshaft is attached is terrifying). Its an open diff though, and im thinking theyre a little bit tougher than the lsd. wheel tends to spin before it can put and real torque down.
Old 10-05-02, 02:31 PM
  #4  
Full Member

 
NA86RULZ's Avatar
 
Join Date: Dec 2001
Location: New Haven, CT
Posts: 187
Likes: 0
Received 0 Likes on 0 Posts
Can I put a TII tranny in my '86 NA? I need a new transmission, and I figured a TII tranny would work fine. If I can, how will the preformance of the car change?

Mike
-------------------
'86 NA
Old 10-05-02, 07:22 PM
  #5  
Need donor car in Fairfax

 
darkwaveboi's Avatar
 
Join Date: Nov 2001
Location: Northern Virginia
Posts: 1,759
Likes: 0
Received 0 Likes on 0 Posts
it wont do much at all.

Just put an NA in there.
Old 10-05-02, 09:33 PM
  #6  
I stretch 315/30/18

Thread Starter
 
projectsupramk3's Avatar
 
Join Date: Sep 2002
Location: Port St. Lucie, FL
Posts: 19
Likes: 0
Received 0 Likes on 0 Posts
hey, thanks RETed thats just what i wanted to hear. one more question, does the t2 diff have the same bolt patterns as the n/a, so i can just switch them out?
Old 10-06-02, 02:50 AM
  #7  
Lives on the Forum

 
RETed's Avatar
 
Join Date: Feb 2001
Location: n
Posts: 26,664
Likes: 0
Received 16 Likes on 15 Posts
The diff will drop right in, but the half axle shafts are different bolt pattern and the pinion is longer (and thus the diff housing is longer) for a turbo - this obviously makes the driveshaft bolt pattern different with a differing length.


-Ted
Old 10-06-02, 12:08 PM
  #8  
Driving RX7's since 1979

iTrader: (43)
 
HOZZMANRX7's Avatar
 
Join Date: Aug 2001
Location: So Cal where the OC/LA/SB counties meet
Posts: 6,096
Likes: 0
Received 8 Likes on 8 Posts
My friends at Mazdatrix tell me....

that a driveshaft from an automatic is close enought to correct length to connects a NA Tranny to a TII 3rd member (diff). BUT, you will need to swap out the half shafts from a TII as well as the bolt pattern is indeed different to NA half shafts.

Suggestion, see if you can get a rear diff from Japan. Much more money. But, I remember reading on a previous thread that they are 4.3 gear ratio. Do a search and you'll find what I'm talking about.

Old 10-06-02, 01:25 PM
  #9  
Rotary Freak

iTrader: (10)
 
gnx7's Avatar
 
Join Date: Mar 2001
Location: San Francisco, CA
Posts: 2,085
Received 19 Likes on 9 Posts
THere is a TurboV6 powered GXL pushing in excess of 450hp/450ft/lbs tq thru the stock N/A posi diff with no problems launching on Nitto DR's.

I have a T2 diff and I expect it to handle 600hp and 600ft/lbs of torque launching on slicks soon (upgrading turbo). I have thoroughly abused this diff with about 400hp and launching on 5-10psi off the E-brake on slicks with no problems.

Get an upgraded HD diff mount from Mazda Competition (Mazda USA Motorsports division). They are much stronger and only about $50 made of much harder rubber.

-GNX7
Old 10-06-02, 02:57 PM
  #10  
Lava Surfer

 
bingoboy's Avatar
 
Join Date: Mar 2002
Location: Kailua, HI
Posts: 2,354
Likes: 0
Received 0 Likes on 0 Posts
wouls a GTUs 4.3 lsd diff bolt up to a different NA rear?
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
Th0m4s
Build Threads
25
02-26-19 02:04 AM
coltboostin
Rotary Drag Racing
0
08-20-15 11:37 PM



Quick Reply: rear end strength?



All times are GMT -5. The time now is 01:30 AM.