i was wondering if any of the stock fc rx7s came with clutch type lsd's. i know most turbo II's come with viscous but do any come with a clutch type. thanks for your help.

 

S4 T2s had a clutch type, they went to viscous with the S5.

 

s4's came with clutch type surch under my name for lsd thresds you'll finde a coupple talking about the RX7 LSD's

 

s4 gxl's had um too.. but the N/A diffs are different.

 

so would i be able to fit the clutch type on my 91 na?

 

Which is better.....clutch or viscous? What are the advantages and disadvantages to each?

 

clutch is definetely better. when the lsd oil on the viscous heats up it becomes a open diff. so its a little better then open diff but not really. clutck type always kicks

 

main advantage of clutch over viscous is:

clutch type always grabs regardless, viscous only grabs after the differential has started to spin so there is a loss of traction off the line.

 

http://fc3spro.com/TECH/MODS/DT/lsd.htm


-Ted

 

if this one works its several things about the lsd's that i ahve asked questions about

https://www.rx7club.com/search.php?searchid=427390

to be exact this one has peoples opinions on the difrent lsd's

https://www.rx7club.com/showthread.p...&highlight=lsd

 

" The Zenki clutch-type LSD's are known to wear out within 30,000 - 50,000 miles."



this statement is a little misleading, under 'harsh' driving conditions the clutches may wear out but my car with the original diff with 163k miles on it still has full lock on both axles, those figures represent the low end of the spectrum for those who read it.

 

So my S4 88 TII has the good lsd then......that's good to know. Looks like I'll be taking her sideways soon.

 

no i think it has the viscous. sorry to dissapoint u.

 

but im still wondering will the clutch type bolt on to my 91 na. cuz i got the viscous right now

 

Wait a second......I thought the S4 TII's came w/ the clutch type LSD?
......Correct?

 

No, it has the clutch type. Read above.
If a car has LSD:
86-88 had the clutch-pack LSDs', 89-91 had the Viscous LSD's.


You can swap all LSD's within series (they swap directly across), but you can only use an N/A LSD in an N/A rear end, and a turbo LSD in a turbo rear-end.

SO, yes, you can change out your S5 viscous LSD to an S4 clutch-pack LSD.

 

im not 100% sure but thats wat i heard. cant u feel it though. you know wat. do a burnout a couple of times and have someone stand behind the car to see if both tires keep spinnin at all times. you cant just do it once cuz the viscous will work till the fluid heats up.

 

You are grossly misinformed on how a viscous LSD works.

 

You're right. He's wrong.

 

alright thanks for your help scathcart. ive been asking these questions to make sure i didnt get screwed, cuz i bought a clutch type from a na for a 115$ with the casing and everything

 

Correct me if I'm wrong but I think that visous LSDs only work when the fluid heats up. When it heats up, it expands and causes some plates to contact one another and that locks the diff. Sorry for the vague descriptions but its the best I can remember at the moment.

 

thats right, but like it was said before, too much heat or abuse ( ie drifting event) and it will be worthless. at the same time, drive any car with an aftermarket diff (1.5 way, 2 way) and you will feel the difference between that and a s4 clutch type. just cause its clutch type dont think its the best thing in the world.

 

you could always get a thorsen dif from a miata some guy did a write up on that

and s4 LSD's have a tag on them

 

http://www.negative-camber.org/crisp...c/fcpart17.htm

 

S4 clutch type vs. S5 VLSD: 1 or 1.5 way???