How this idea? 20B + RX8 Transmission

[TitaniumTT]

Originally Posted by RETed

Local RX-8 owners have been all blowning up their transmissions, and the local Mazda dealers are tired of dealing with it.
That's basically my "direct" experience with them.
I guess you can argue that the local RX-8 drivers don't baby their transmission...


-Ted

When taken as a group I doubt the HI crowd is any harder on their teams than the group in CT
I doubt that they are blowing apart, stripping gears, breaking shafts or anything else that I would co wider blowing up. I bet each tranny could be fixed with minimal effort/parts. Why Mazda doesn't do this I don't know. FWIW the earlier Raisin boxes found in the Miatas were a better design.

Originally Posted by Rotary Inspired

Titanium,

They were just replacing them. I had a 2nd gear grind occassionally on my 8 when I had it w/ the Aisin trans. I have yet to take the Aisin tranny apart so you may know more than me here on the interals, but I haven't had any problems w/ the TII tranny behind the 20B I helped w/ and that is where I make my recomendations. I just can't imagine putting down that much power the added torque the 20B produces and expecting the 8 tranny to hold. It might be better w/ straight cut gears ie dog box, but again I have not tried. I am just going on what I have seen and had a hand in.

Again, its not a strength issue with the trans. I cannot stress this enough, all the failures the I have seems and spoken to owners about have NOT been caused by applied torque. The TII box is more RELIABLE, I'm not doubting that all I am saying is I have never seen a Renni tranny blow up. I've seen plenty of failures but never seen one destruct from torque

Originally Posted by project86

What is the inherent flaw? How do you usually see them fail? Also what drive shaft would you use to make this work in the fc? That seems like another obstacle.

Its allowing the 2nd gear hub to over extend itself and jam. Trans doesn't shift and sometimes won't even rotate. People assume.... Key word.... That its blown when in reality its completely usable after disassembly. Stock TII driveshaft with a slight mod should work. I'll update y'all in a few weeks when I get it back.

[project86]

Originally Posted by TitaniumTT

Its allowing the 2nd gear hub to over extend itself and jam. Trans doesn't shift and sometimes won't even rotate. People assume.... Key word.... That its blown when in reality its completely usable after disassembly. Stock TII driveshaft with a slight mod should work. I'll update y'all in a few weeks when I get it back.

So this is still a problem even in the newer model 8's? Ill have to be completely honest. It sounds like a pain in the ass. I mean, who wants to have to randomly pull apart their tranny to fix somethin like that? Im still ridin the fence on the subject but if you can convince me it wont be a problem then im cool. I honestly dont have beef with the TII tranny. Although ive only driven one and i only have my honda tranny, NA 7 tranny, and a hyundai santa fe tranny to compare to hahahah

[TitaniumTT]

Originally Posted by project86

So this is still a problem even in the newer model 8's? Ill have to be completely honest. It sounds like a pain in the ass. I mean, who wants to have to randomly pull apart their tranny to fix somethin like that? Im still ridin the fence on the subject but if you can convince me it wont be a problem then im cool. I honestly dont have beef with the TII tranny. Although ive only driven one and i only have my honda tranny, NA 7 tranny, and a hyundai santa fe tranny to compare to hahahah

As far as I know, yeah, it's still a problem. We're working on resolving it with my trans, which is based off the 8. Honestly though, I despise the TII box, I hate the chunky fucker. The Renni box is much nicer to drive, it's just dealing with that hub and properly limiting the travel. We have ideas and will hopefully be pulling it apart friday. It'll will work, I promise you that. Take a look at the ratio's and tell me that it's not a better trans for any ported engine.