How this idea? 20B + RX8 Transmission

[project86]

Originally Posted by TitaniumTT

Oh I will Even if it blows up on the first dyno pull, and I mean REALLY blows up as in the case flex's and the gears sheer teeth, then I will say - yeah, the trans is weak. But if they keep failing in the way that I have ALWAYS seen them fail, then no, I will continue my stance that the trans is just as strong as the others, just built with looser tolerances and an inherant design problem.

Like DJ said though, alot of it is in how the trans is shifter.

Personally I HATE the Type-R box. I hate everything about it. I hate the ratio's, I hate the weight, I hate the fact that it shifts worse than any of the trucks that I've owned. The only good thing about it is it's a known strong box that can take ton's of torque.

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.

[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.

[project86]

ill give the ratios a looksy. havin a 6 speed would be kinda cool

[Renesisking]

I have an RX-8 with over 85K on the tranny and I've had no issues. I know quite a few people that ran Esmeril Turbo kits or even the Greddys and they've had no issues with the bump in torque. I was talking to Dave at KDR and he said as long as its within reason and you don't drive like a maniac you won't blow through your tranny (same goes with the motor). Him and I have been tossing around the idea of dropping a NA 20b in my car all while using my same transmission. Since I plan on keeping it in NA form, Dave said the RX-8 transmission will do just fine. As far as the balancing goes, you are just better off taking weight off of the front end than you are adding weight on the rear. I didn't think you could move the 20b back 6 inches in the FDs.

[TitaniumTT]

Originally Posted by Renesisking

I have an RX-8 with over 85K on the tranny and I've had no issues. I know quite a few people that ran Esmeril Turbo kits or even the Greddys and they've had no issues with the bump in torque. I was talking to Dave at KDR and he said as long as its within reason and you don't drive like a maniac you won't blow through your tranny (same goes with the motor). Him and I have been tossing around the idea of dropping a NA 20b in my car all while using my same transmission. Since I plan on keeping it in NA form, Dave said the RX-8 transmission will do just fine. As far as the balancing goes, you are just better off taking weight off of the front end than you are adding weight on the rear. I didn't think you could move the 20b back 6 inches in the FDs.

I must say I agree with Dave and with your experiences regarding the trans.

You could move the engine 6" back in the FD, you'll just have to cut the firewall out and fab in a new one. Sounds easy right

[Renesisking]

Now you got me thinking about how much I'd have to cut on the 8 in order to get a proper balance. There was a company that was supposed to make a bolt on subframe. They were trying to go about it two ways, I'll try to copy and paste his website link on here, once I find it. They haven't gotten very far as of yet, and I am hoping they do it soon. One of the ways was supposed to come with a subframe with mounts pushed back and a shortened drive shaft so that the steering rack would remain in the same place. The other was a relocation of the steering rack and something else which I cannot remember.

[project86]

im kinda startin to like the idea of this though. now that i know its not gonna take some outrageously priced custom drive shaft.

[djmtsu]

From what I have seen, people who don't know how to shift like a man, but rather a gorilla, are the reason for most transmission failures.

May I present: http://raceroots.com/index.php/produ...cro-saver.html

This should help the retards from overshifting and tearing them up.

[project86]

Originally Posted by djmtsu

From what I have seen, people who don't know how to shift like a man, but rather a gorilla, are the reason for most transmission failures.

May I present: http://raceroots.com/index.php/produ...cro-saver.html

This should help the retards from overshifting and tearing them up.

bahahahaha... silly retards

[project86]

Thats actually a cool idea. i like it.

[Renesisking]

I have one, but never put it on.

[project86]

looks like it would work well. these guys must really be pounding through the gears though to be doing that damage. I dont know that i would need one of those but it would be a decent preventative measure though. seems over priced...

[Renesisking]

You can find them on RX-8 club used for cheap-ish.