well aidan grenaded his 3.9 last week and he's not even at 300whp so be careful

Was his a MSM Torsen? That's what I meant, I know people have broken regular torsens at dragstrips, but I haven't seen anybody fail a MSM torsen.

3.9 is a regular. I honestly dont think it's bigger or stronger, I just dont think many people drag race on MSM torsens, and the ones that do are mostly stock or bolt ons so they're not making any sort of significant power. just speculation tho

I can tell you 6 sp + 3.9 sucks on the street.
3.6 is noticeably better.

My old 5 sp + 3.9 was wonderful on the street. I miss it dearly.
Its gears 1-4 are similar to a 6sp + 3.3.

The roadstermiata 3.3 group buy is dead.

The MSM never came with a Torsen.

oh right, it's bosch or something right?

I grenaded my 4.1 torsen at around 220whp, 190lb/ft. But according to my logs I was nowhere near peak power when it blew. Probably more in the 170-180 in first. Leafy did the same with a lot more power. I was on relatively sticky tires on one of the best drag strips on the east coast. So there was a ton of grip. Wheelhop killed it, I doubt it was power.

The torsen is made by Bosch. Its the fujitshisushijdm tochicafukaokinawa thing.

The MSM is a Tochigi-Fuji.

That's what I meant

http://www.mazdausa.com/MusaWeb/pdf/..._specs_MIZ.pdf

http://www.miata.net/garage/diffguide/

Bosch made it but the type it is is a Tochigi-Fuji. I remember the original ad for it lol.

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<br />I was close.

Props for trying lol

Ok so it's a Bosch LSD. I guess the question of whether it's any stronger than any other LSD is still an unknown. I think I read it's the same LSD used in the S2000. I guess I'll look into that and see if any S2000 owners break them as much as you guys break torsens.

The S2000 guys have mods they do to the diffs to handle their big turbo motors. Billet caps, preloaded caps, etc. Search Puddymod.

cap straps
https://www.miataturbo.net/attachmen...ine=1433960510

solid crush collar
http://www.s2ki.com/s2000/gallery/pa...979__file__med

plus nicer hardware, cryo, REM, bla bla bla.

They ball on a different budget

<p>Revisiting this because I think there was false information posted above. The MSM diff is a Torsen, just called something different. Bosch sold the Torsen name so they had to call it the&nbsp;Bosch torque sensing limited-slip rear differential. The rest of the miata line up switched to the TF in 03 but the MSM didn't.</p><p>Which LSD in an MSM [Archive] - MX-5 Miata Forum</p><p>http://forum.miata.net/vb/showthread.php?t=508115</p><p>http://www.s2ki.com/s2000/topic/7755...-differential/</p>

I don't even know who to listen to anymore

lol

<p>@turbofan&nbsp;is your rear diff still apart?</p><p>Its pretty well assumed that the MSM diff is the same as the S2000, and thats definitely a Torsen.</p>