Saturday, November 19, 2011

How major is the difference in the transmission between a manual 1995 mazda rx7 and a manual 1990 rx7?

I have a 1990 Mazda rx7 and want to do a swap with the 13B cosmo eunos out of the 3rd rx7s (93-02). Does anyone know how much of a major difference between the two transmissions are and maybe where I could find the correct one?|||The Cosmo 13B-RE bolts onto the stock FC transmission with no problem. The Cosmo 13B-RE only comes with an automatic transmission option, so it will most likely have a counterweight and flexplate attached; if your engine did not come with a counterweight, you can use a Kouki FC3S/FD3S stock flywheel or automatic counterweight. If you are going to use an aftermarket (lightened) flywheel, the automatic counterweight is required. The automatic transmission counterweight makes it easy to install an aftermarket (lightened) flywheel in this case. Be sure to install a new pilot bearing and pilot bearing seal before installing the clutch.





now the 13b-REW from the 93+ will fit on the stock transmission with some small mods. But i wouldn't recommend that swap because its to much work. if you plan on hopping it up the stock turbo 89-91 13b-dei would way more bang for the buck. most people swap out in favor of a larger single turbo anyways.|||B.H is spot-on with this. One thing to consider is that the 13B-RE from the Cosmo isn't much of an upgrade over a stock Series 5 13B Turbo (89-91). In my opinion, the extra 30hp isn't worth the work to mess around with wiring, engine mounts, engine management and so on. If you're gonna build mounts, it's probably best to go all the way and just go 20B like I did. The mounts are the same for a 13B-RE too





Just keep your stock FC transmission. The N/A ones have been proven to handle 400+hp in a daily driver by Aaron Cake. If you've never heard of him, he's one of the admins at the rx7club and REALLY knows his stuff. And he's a cool guy to talk to too. The TII transmissions are even more stout, so it just depends on what you have to start with.





Flywheel: You'll need a stock S5 or FD flywheel, depending on your transmission. For aftermarket lightweight flywheels, get the rear counterweight from either a S5, FD or 13B-RE Cosmo. They're all the same part number





On my Series 4 20b FC (yup, a 1987!!!), I'm using a Series 5 J-Spec Turbo transmission, FD Clutch and ACT Prolite flywheel

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