FWD tranny for Rotary

[Rotary Inspired]

OK guys I am looking to know what tranny is the smallest and strongest FWD tranny Mazda made. I need it to withstand 200hp and the smaller the better. Any help would be greatly appriecated.

I am working on a rotary swap into a FWD car w/ a tiny engine bay. Thanks in advance.

If this thread needs to be moved feel free.

[95ProLeila]

*sigh* the forum isn't even a month old and we're already getting these questions . . .

[Marc]

*sigh* the forum isn't even a month old and we're already getting these questions . . .
Don't hate.

[MazKid]

So, you're going to put a 13B TII motor in a Festiva?

Good luck with that. It would be a lot of work. Pretty much any FWD Mazda transmission can take 200hp. You'll have to make an adapter plate thingy, fully custom linkage, etc. That's just for the transmission, the engine is even more work.

[pigeon]

If you have a crashed RX7, you're a machinist with access to the tools/equipment/materials, and have good mechanical knowledge....

it wouldnt be THAT hard to do.

[Suzuka323]

If someone can get a 13BTT in a Tercel, it can be wedged into a Festiva!

[1967cutlass]

*sigh* the forum isn't even a month old and we're already getting these questions . . .


Yeah god forbid someone asks a question about FWD mazda transmissions on "The international FWD Mazda Enthusiasts' community" website. You need to chill out.

[1967cutlass]

Good luck with that. It would be a lot of work. Pretty much any FWD Mazda transmission can take 200hp.

Back that statement up with facts, I dare you. Why don't you stay out of threads that have content which is over your head.

Anyway to add my input, the G series is the strongest one I can think of that wouldn't have a ton of electronics. The other ones like the F series and automatics wouldn't hold up as well. I don't know much about the actual dimensions of the trannys but I'd imagine that a G series+rotary wouldn't take up much room.

[NEGATiZE]

Hmm, I found this car on the internet but know nothing about it.

[mazdaracer]

damn, good find. mmm, RHD too

note to owner: BADASS DUDE! but must remove those 4 chrome bling's immediately :)

[NEGATiZE]

I concur.

[SgtRauksauff]

hmm.. Carbureted, with an open element filter. And what appears to be an FMIC behind the grille.

same car in both pictures? supercharged and not turbocharged? All show and not as much go as possible?)

I've seen those pics before, but i never noticed that inconsistency before. ah well. still badass by any means. I need a 13B TII for my MX3..... ooh..... and an RX7 rear end while I'm at it... the mx3 just looks like a miniature FD, doesn't it, or is it just me?

--sarge

[9zerO]

I think they used a g-gearbox, but I could be wrong.

[BuGS]

They used a Motorcycle Tranny If i remember, and that is a 12A, if you look to the right of the filler neck you can see the A.

They have info on it in some NZ forums.

It is also in a BF 323.

[PseudoRealityX]

So, you're going to put a 13B TII motor in a Festiva?

Good luck with that. It would be a lot of work. Pretty much any FWD Mazda transmission can take 200hp. You'll have to make an adapter plate thingy, fully custom linkage, etc. That's just for the transmission, the engine is even more work.

Back that statement up with facts, I dare you. Why don't you stay out of threads that have content which is over your head.




Ok...

Trannies are rated upon how much torque is transmitted, not horsepower. Infact, you design the input pinion and gear set to wear your desired lifetime, with a slight bias towards failure on the side of contact stress, and that gives you your facewidth. From there, you work out a duty cycle that you plan on seeing from the car under it's normal life, and then do analysis on each of those gears seperately. 1st, 2nd, and 3rd are all designed based on max-acceleration conditions, due to them having very few cycles, and the gear ratios end up making them pretty thin to withstand normal duty cycles. 4th in a lot of boxes isn't it's own gear, and is rather a 1:1 between the input pinion and gear, and 5th is ALWAYS designed based on fatigue life rather than max acceleration situtations.

And for that last reason, that's why the weak point of the Mazda FWD trannies is always 5th.

Note*: this doesn't go into the design of the differential, which in some cases is the obviously weak point in these trannies.

[SgtRauksauff]

cool! that's the kind of information I like to learn. Now, if only I had access to a machine shop and fabrication equipment, materials, and the knowledge to run them.. I'd be building my own transmissions to withstand max acceleration from torque of about 300ft-lbs, and make sure the diff was set up to not be the weak spot. If there was a weak spot, I would really really really prefer it to be the passenger side CV axle. :)

The one thing that still kinda bugs me about that car, though, is that it seriously looks like an intercooler behind the bumper there, but the engine shot shows a carbureted 12A, with no forced induction of any kind. So, are my eyes playing tricks, is it two different cars, or the same car but different times, or do I just need to get some sleep?

Oh, and the wheels bug me too, but that's just a personal thing with bling, about which insults I will not sling, no matter how much they bring, even if they are the king. Why? It just ain't my thing.

--sarge

[Lex]

Maybe thats not an FMIC, maybe it's a huge oil cooler?

[SgtRauksauff]

but it looks like there is a huge red silicon joint coming out of the left side of it.

and that looks like bar-and-plate to me, not one huge tube running back and forth..

but, no big deal. still a cool ride. I've got a buddy with an '82 RX7 with a 12A that he's going to be doing the Holley 4bbl carb and probably a Racing Beat exhaust. probably a little port and polish too, maybe.

--sarge

[silverchris]

I think that swap was done by nocamz motor sports in NZ
There is a thread on mazda323performance.com somewhere about it I think

[BuGS]

ya, the IC was from the B6t that was in there before. They left it in there to be funny. If you look you can see the IC couplers but no piping :)


But it is a 12A with a racing holley carb setup.

[Boostedpro]

OK guys I am looking to know what tranny is the smallest and strongest FWD tranny Mazda made. I need it to withstand 200hp and the smaller the better. Any help would be greatly appriecated.

I am working on a rotary swap into a FWD car w/ a tiny engine bay. Thanks in advance.

If this thread needs to be moved feel free.


Late 80's Mazda 626/MX-6 FWD Trans for the 2.2 liter SOHC works. It's the same engine used in the MAzda B2200 pickups that everyones does rotary swaps into so all you need is that FWD trans and an adapter plate from a rotary performance website or shop and you're on your way.

[jnorion]

Wow... so the rotary Protege idea that's been kicking around for so many years may not be as far-fetched as we thought?

[BuGS]

Sounds like they just swap the bellhousings from an RX7 to the Truck Tranny :(

[jnorion]

But he's saying that the 626 or MX-6 has the same engine as the truck, so the tranny from one of those should bolt up to the rotary with an adapter plate. You don't need the truck tranny.

[BuGS]

But he's saying that the 626 or MX-6 has the same engine as the truck, so the tranny from one of those should bolt up to the rotary with an adapter plate. You don't need the truck tranny.

NO!!! They don't make adapter plates, they take the bell hosuing off of a RX7 tranny and put it on the Truck tranny to get the turck tranny to bolt up to the 13B. So the 626 tranny won't bolt up unless we swap bellhosuings, but that doesn't work...

[jnorion]

Ah... I see the problem now. ;)

[josh95mx]

Ok...

Trannies are rated upon how much torque is transmitted, not horsepower. Infact, you design the input pinion and gear set to wear your desired lifetime, with a slight bias towards failure on the side of contact stress, and that gives you your facewidth. From there, you work out a duty cycle that you plan on seeing from the car under it's normal life, and then do analysis on each of those gears seperately. 1st, 2nd, and 3rd are all designed based on max-acceleration conditions, due to them having very few cycles, and the gear ratios end up making them pretty thin to withstand normal duty cycles. 4th in a lot of boxes isn't it's own gear, and is rather a 1:1 between the input pinion and gear, and 5th is ALWAYS designed based on fatigue life rather than max acceleration situtations.

And for that last reason, that's why the weak point of the Mazda FWD trannies is always 5th.

Note*: this doesn't go into the design of the differential, which in some cases is the obviously weak point in these trannies.

if 5th is the week point, then why does almost everyone blow 2nd?

and the week point is the Diffirential; in the F series anyways.

[BuGS]

I got a lead on a company that might make an adapter...

[firelizard]

if 5th is the week point, then why does almost everyone blow 2nd?

Over zealous driving? 2nd gear is a lot of fun.

[MSteele323]

That would be awesome If one could put a Rotary in a BG 323

[kitty]

if 5th is the week point, then why does almost everyone blow 2nd?


Miss shifts from 5th to 2nd :sad2:

[96Familia]

http://www.trademe.co.nz/Browse/Listing.aspx?id=63588151&key=320175

It's a 12a, hooked up to the standard 1500 box, so if it blows it'll be sweet as to replace.