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Yeah. air pressure leakdown test is where I would be headed next here, using one's ears to determine whether it's the valves or bores/rings leaking... -
More likely you didn't bed the rings in correctly and have glazed the bores. Running with misfires on a fresh build is somewhat of a no-no. Surely no-one "smoke tests" the combustion chamber? That's what a leakdown test is for. Smoke testing is, um, a bit of a wank at best, and only really useful for external pipework. -
Well, obviously that kit is not a relocation kit or anything other than just the original isolators and the like. I would suggest that it should be a matter of just bending up some flat bar to build a mount over the top of some other diff, with the flat bar held to the back of the diff by the rear hat bolts. A little welding, a little thinking about how to secure the front of this structure, maybe some different hoses in case you can't get it in just the right place.
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Pay diff/trans workshop to do this. Nope. Z32 turbo ran R230 with 6 bolt GTR style axles. All other Z32 were R200. Basically same same as other R32 stuff. All were a viscous waste of space.
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So, I'm not a diff swapsies specialist, but I am pretty sure the 300zx ran an R220 not and R200 like the C34 Stagea, so I think it is of no use to you. As you said, all you need to do is get the centre swapped in the diff you have, which might be best done by a diff specialist. The current centre is probably desirable to someone to track so an easy path might be to swap your mechanical centre for someone with a standard centre (which is a viscous LSD, and almost certainly won't have any limited left). The only thing you have to watch swapping R200 internals between diffs is that the number of splines on your car's stub axles has to match the donor car, or you need the centre+stub axles and make sure they have the same number and pattern of bolt holes as your rear axles. You swap your current ratio onto the new centre so you don't have to worry about matching the front. Alternatively, centres like the Nismo pro are much gentler (and have adjustable "tightness") so you could buy on of those from somewhere like Jesse Streeter or Nengun (noting it may cost you 1234% extra in tariffs by the time it lands)
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