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By joshuaho96 · Posted
Downshifts are harder on transmissions than upshifts, the input shaft naturally slows down once disconnected from the engine so the synchros aren't doing all the work. There's no "natural" tendency for an input shaft to increase RPM. Something is not right there, I don't have a great answer on what. You can try a dedicated GL4 75W90, I plan to switch to Motorcraft XT-M5-QS which is supposedly a very good 75W90 for NB Miatas which have a weirdly sensitive transmission from the factory. I would chase down why your clutch is making a hissing noise, that's not normal. It might be no big deal but in the absence of anything else to investigate I would look at that. -
^^ It's a valid point. Sometimes you (and in this case, I) stand too close to the problem to see the solution. The oil control thread eventually came to a recommendation about running lines from cam covers and sump to the catch can. -
Realistically, if you're trying to give airflow up from the sump, to the breathers, and then that excess will vent through the catchcan, skip the cam covers, and take sump straight to the catch can. -
Consider it as a G25-550 in a T3 .63 rear housing. So performance wise will be very similar. -
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