Does the FC come with LSD?
If not then what other companies make them?
Thanks!

86B~

 

Some of them did others did not.All Turbo II Rx-7s came with LSD for sure as did the 89-90GTUs.As for the rest seems the overall conensus is it's luck of the draw.Some GXL's did some didn't.87-88 GTU did, 89-92GTU did not.As for after market you can get a Torsen which is supposed to be very good.Mazdatrix and Rotary Performance sell them.RP also sells Kaaz diffs.
http://www.rx7.com

 

Close, but this should be clearer:

ALL FCs with the big brakes up front(4 piston) should have the LSD rear. T2 rears will not fit an NA without serious drivetrain modification. Some say the GXL from 89-90 and coupe for 91 might not have LSD, but all that I have seen DID have it. They are identified by:

1) tag on the back of the LSD filuid fill bolt saying LSD fluid blah blah...
2) turn one wheel and the other turns same direction
3) turn driveshaft and both wheels turn same way(best test)

Non turbo LSD's bolt into any other non turbo with no mods.

BTW I have an LSD diff for an NA if youre interested.

 

That is not correct.

Once again for someone that didn't search before asking this question:

What had LSD standard from the factory:

86-88 GXL
87-91 T2
88 GTU
89-90 GTUs

Now some 86-87 GS/Sports had them as an option, as did some 91 coupes.

BUT NOTHING ELSE, came standard with them.

Some people have also reported some 89-90 'verts had them, but it was not an option, so it was more than likely refited by the previous owners or dealer installed. The 'vert was already pushing over 3000 lb and adding more weight by a LSD would also not made sense.

The 4 pot brakes had nothing to do with it other than the car didn't come with a LSD unless it also had the bigger brakes. But just having the bigger brakes didn't mean it has a LSD.

 

EVERY 86-7 Sport Ive ever seen had the big brakes. IF it didnt, it wouldnt be a sport, now would it?

EVERY 89-90 gxl/91 coupe had big brakes that I have seen. I think I remarked that some of these cars might not have the LSD to match, but I know for a fact that all of them I have personally seen did. For those of you who say you own an 89-90gxl/91 coupe w/o LSD maybe, just as stated above, a PO retrofitted an open rearend not klnowing the difference when theirs tore up.

I know alot of you like to quote the dealer borchures and stuff that listed available options, but I like to quote my experience with over 50 FC's to date and personal observation.

 

I (as well as family members) bought several FC RX-7's new. And I can tell you and even post the window stickers that came with MY cars like my 87 sport and prove that even though it came with the big brakes, LSD was not standard.

If now you can say that you bought your RX-7 from a dealer new and it came with LSD and ones not on my above list, I will be happy to eat my words. Post a factory window sticker. Run a vin at a mazda dealer. Prove me wrong.

BUT you are completely wrong in saying that if the car came with the dual pot (or 4 piston) brakes it came with an LSD. Either your observations are wrong or you are testing wrong. It doesn't matter how many cars you have worked on anymore than that I made my living working on cars for 15+ years.

For example my 88 'vert has the 4 piston brakes... and it most certinly does not have an LSD. Yet some people claim that they did.

The 89 and 90 GXL came with 4 piston brakes, and it does not have an LSD.

Perhaps you have seen a lot of series 4 GXL models since they and the SE/Base model were built the most often.

 

Thanks for the info guys!

86B~

 

I guess between people like you and tmak26 who say no and people like me who say yes, a satisfactory resolution will never be reached, since this thread has been going ever since I can remember the forum being here.

Probably the best happy medium to reach is this:

you keep driving your dealer bought, LSD-less sports out in Cali, and Ill keep driving/selling my LSD equipped sports and GXLs here in east Tn, and we'll all be happy. I might look into modifying my testing procedures, but for now looking for the LSD tag on the rear plus spinning the driveshaft only to watch both wheels spin forwards will do for me. I suggest to the other curious forum members these tests as well.

Have a good day!

 

Not to beat a dead horse, but the tag only came on the series 4 cars.

The series 5 cars, came with a fluid type LSD not a clutch type, so there was no need for the special lubricants tag that the clutch type LSDs required. Only 90w.

 

I have an 89 GXL parts car and it doesn't have LSD but it was also an automatic.Spin one wheel and the other one does nothing if I remember right(it's been about four months since I had the rear jacked up and did the test)needless to say I was disapionted as I thought it would have it.From what the two of you are saying Icemark and hypntyz7 I come to the conclusion that unless it is a TII or a GTUs there is no garauntee that it has LSD unless you recieve the cars original window sticker with the car.The only way to know is to jack the rear of the car up and perform the aforementioned tests.I see no need to argue as I believe you both to be right about what you have each personally seen.That is why I think it is luck of the draw on getting an LSD.If your buying a car and LSD is crucial to you decision take it and get it put up on a rack and spin the wheel and driveshaft.I also believe the car has to be in neutral for this test to work as you can't spin the driveshaft with it in gear.I will recheck my parts car sometime.

 

Go for the best Torsen around, i did!

www.gurumotorsports.com

 

S5 GXLs dont have the LSD. I have one, i know

 

To verify you've got a (working LSD), just to a burn-out.

Watch out with any test (even the above one), because the factory (clutch-type) LSD is notorious for wearing out within 30k-50k miles - moreso on turbos.

1986-1988 Zenki FC's only came with factory clutch-type LSD's.&nbsp 1989-1991 Kouki FC's came with factory viscous-type LSD's.

Clutch-type LSD's can wear out.&nbsp Viscous-type LSD's cannot, but these functioning are highly dependent on fluid condiiton.

Torsen (short for Torque Sensing) is fine for moderate powered vehicles.&nbsp FC's running serious power (400+hp) will probably break Torsen diffs, as the worm gears are very delicate.

Currently, the only brands of aftermarket LSD's available to the FC3S is:&nbsp Mazda Competition/Mazdaspeed, KAAZ, and Cusco.



-Ted

 

And the Guru from Australia!

www.gurumotorsports.com

 

According to the website their LSD's are Series 1-3 only. That's no use to me!

 

Hi, I just phoned them up, the wbsite is a bit out of date! They have gone away from doing a Torsen for the FD but instead are in final devt of an adjustable Plate one for the FD, more details will be on the web soon! Apparently better than the Torsen for the FD!

 

Doh, and you didn't know that?

http://fc3s-pro.com/TECH/MODS/DT/lsd.htm
(new section!)



-Ted