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Hey guys and girls I'm at the point where my rb26 BMW is almost ready to go I'm worried the diff will shit itself. So to add a bit of reliability to the drive train I want to install a gtr mechanical LSD now from playing with lots of skylines and sussing out the BMW rear I know it won't be a bolt in solution I have a ideas of how to do it but wondering if anyone has any ideas how to go about this

A supra ma70 will go in without too much drama, they are narrower than the r200.

If you run the 6 cylinder axles, theres just enough room to make axle adapters to the ma diff

I looked at the r200 into mine but they are just too wide / about 340mm vs 260mm

To help you search for Supra diffs

Early 3L Non Turbo - 4.30 LSD

Early 3L turbo manual - 3.91 LSD

Later 3L turbo auto - 3.73 LSD

Early 2L Turbo 4.5:1 open for both auto and manual I believe

2.5L Twin Turbo R manual trans 4.11:1 Torsen center

2.5L Twin Turbo R Auto 3.9:1 Torsen centre

Also B series JZA80 (late model) diff centres allegedly fit inside the MA70/JZA70 diff housing, which can be had in 3.20:1 up to around 3.60:1

I should add that they can be a bit of a pain with big power

as it spins one wheel, then the other, and repeat (was a big problem with some of the older HSV's that had them, I can say I have noticed it with my car though

Horses for courses. Helical (Torsen) diffs feel excellent on the road. Smooth, repeatable, consistent behaviour. Any tendency to shuffle drive from one side to the other with big power could probably be dealt with with some adjustable dampers. I just put an S15 centre (it's helical) into my R32 and it's wonderful.

  • 3 weeks later...

i know its prob not going to sit well with some of the guys on this forum, but i have seen a conversion done on a 3 series BMW using an IRS commodore diff. it was fairly straight forward apparently, but i would make sure to research it. its not a bad idea as theres alot of ratios available and lots of options for centres LSD's, detroit lockers, spools etc.

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