I'm Back! '90 GTUs

[infernosg]

Originally Posted by TitaniumTT

Absolutely correct. Not to mention the 5.11 gears and Hoosiers that put way more strain on a tranny.

How I'd love to have a 5.11:1 final drive ratio. Looks like the highest option other than complete custom for the FC is Mazdatrix's 4.77:1.

Originally Posted by project86

Even with the 350 hp number in mind? At this point my plan is to do a NA 3 rotor when its time to do the engine swap. Its what i really wanted originally with my old car (or an RE swap but i don't want to deal with turbo now). I guess I shouldn't have been so vague in the beginning with this question. So now its all out there.

Im probably really showing my ignorance now but why would it be a expensive/confusing to just swap a TII transmission in? Seems like that option would be less expensive than buying another trans and then having a shop swap the gears and mod the input shaft?

Oh, I didn't realize you were planning on swapping a 20B. 350 hp in a naturally aspirated 20B is optimistic without sacrificing some drive-ability, but that's another conversation. I still think as long as you're not beating on the car constantly (hard launches, constant high-RPM driving, etc.) the N/A gearbox will be fine. You can always change the fluid more often to be safe.

My comment about the complexity was assuming the stock N/A 13B. To switch to a turbo gearbox you need a turbo clutch and flywheel, starter, and unless you want a custom driveshaft to the stock N/A rear end, the turbo differential as well.

[project86]

Originally Posted by infernosg

Oh, I didn't realize you were planning on swapping a 20B. 350 hp in a naturally aspirated 20B is optimistic without sacrificing some drive-ability, but that's another conversation. I still think as long as you're not beating on the car constantly (hard launches, constant high-RPM driving, etc.) the N/A gearbox will be fine. You can always change the fluid more often to be safe.

I think the 350 number is attainable from what I've been reading lately. I came across a thread on the other forum that a guy did a 3 rotor na build for his FD. The made 345whp. His comments were that the car was just fine on the street drivability wise minus his clutch choice. So i am hopeful.

Originally Posted by infernosg

My comment about the complexity was assuming the stock N/A 13B. To switch to a turbo gearbox you need a turbo clutch and flywheel, starter, and unless you want a custom driveshaft to the stock N/A rear end, the turbo differential as well.

That makes perfect sense. Im glad to know that that miata gear swap is still on the table.