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According to this http://www.nismo.co.jp/en/products/competition/lsd/pdf/lsdpro_price.pdf you have a couple of possibilities.

If your car is auto or tiptronic auto, then you have a 4.083:1 LSD using a viscous centre. That is very similar ratio to the usuall 4.11 in manual turbos, but does in fact have a different number of teeth on the crownwheel and pinion set.

If your car is a manual, then it gets a little more muddled. The options include a 4.363:1 LSD using either a viscous or helical centre. The way to find out which it is is quite simple. Jack up the whole rear end, put it in neutral, handbrake off and turn one of the wheels. If it is a viscous centre then the opposite wheel will turn in the same direction as the one you are turning. If it is helical then the opposite wheel will turn the opposite direction, just like an open diff. You can work out the ratio by counting how many turns of the tailshaft occur for one complete turn of a wheel. You may prefer to do two turns of the wheel to make it easier to count how many turns of the shaft, because 4.1 and 4.36 are kind of close together and may be hard to tell apart.

According to this http://www.nismo.co.jp/en/products/competition/lsd/pdf/lsdpro_price.pdf you have a couple of possibilities.

If your car is auto or tiptronic auto, then you have a 4.083:1 LSD using a viscous centre. That is very similar ratio to the usuall 4.11 in manual turbos, but does in fact have a different number of teeth on the crownwheel and pinion set.

If your car is a manual, then it gets a little more muddled. The options include a 4.363:1 LSD using either a viscous or helical centre. The way to find out which it is is quite simple. Jack up the whole rear end, put it in neutral, handbrake off and turn one of the wheels. If it is a viscous centre then the opposite wheel will turn in the same direction as the one you are turning. If it is helical then the opposite wheel will turn the opposite direction, just like an open diff. You can work out the ratio by counting how many turns of the tailshaft occur for one complete turn of a wheel. You may prefer to do two turns of the wheel to make it easier to count how many turns of the shaft, because 4.1 and 4.36 are kind of close together and may be hard to tell apart.

that's exactly the kind of answer i was looking for, thanks so much for that! :)

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