Guys,

Have any of you tried running an MX5 diff in your non turbo gen 2? I have heard they bolt directly in and the offset is correct?

 

Uh...Im assuming you mean the whole rear end?


You know those are only 6inch rear ends?


You know they break at around 200 hp?


You know most of them are either open or viscious LSD's?

 

the 94+ miata diffy is supposed to go right in, and its a torsen too

mike

 

I dont know about fitment on a FC, but some 94+ Miatas have the torsen LSD, and it is fairly strong. Many people are pushing 250rwhp on FMII powered turbo miata, and the stock driveline seems to handle it quite well. Anything after that HP level is where you see things breaking though. I dont think it would be of any concern to a N/A FC though.

 

Is that why all the guys making bigger power try to upgrade to the rx rear ends?



EDIT: And whole rx drivetrain for that matter.





The bottom line is why would you ever want to put a Miata rear in an RX?

 

the miata tranny and rear end (94+) is the same as the na fc's stuff

mike

 

I never said a miata driveline was better, nor did I say it was a good idea to swap one into a FC. It wouldnt IMO. And yes people upgrade to FC drivelines, but its only around or after that 250rwhp mark, and its a T2 driveline they upgrade to. The N/A FC one is probably only minimally stronger than a miata's... I was just saying that a miata diff (94+ anyway) isnt all that weak..

 

The Torsen diffs are a very popular upgrade to a NA RX7 and do indeed bolt right in. They have proven their durability in ITS competition with motors putting out as much as 200 hp (that's about all a legally modded ITS motor will make). I believe the Mazdaspeed website even lists the RX7 as an application under the Torsen part number.

 

thanks for the info.

Am I correct that the turbo diff size is different to the non-turbo diff size then on an FC (Gen 3)

 

The ring gear diameter is larger on the Turbo models.

There may be other differences, but that alone will keep you from swapping between the two.

 

Actually, Ive heard of miata guys using the n/a FC diff b/c its stronger than the miata one, and bolts right in.

 

The centre or the gears?