Guys, what do you all use for transmissions on your cars? I've read from numerous posts that the stock FD tranny is good to around 550 hp. I've been throwing around the idea of buying a supra transmission but have to do more research. Seems to me the stock TT supra trans is good to like 800 hp w/o mods.

Any input would be appreciated!!!

Thanks

Travis

 

Please don't all answer at once, I know I'm a post killer but jeeze...

I know a number of people here on the boards have 20b's installed in their cars. What did you do or what type of trans are you using?

 

i dont see why the stock t2 or 3rd gen tranny wont be up to the task if its a street car....if u plan on dropping the clutch at every stop light then do what im doing, call up kennedy engineering to get a ford T-5 adapter plate....what this adapter does is mate the t2/rx4 style bellhousing to the ford mustang T-5 tranny.....now the stock t5 will need upgrading, so call Gforce transmissions and ask for a complete dog box rebuild with ur gear ratio that'll handle most of what u can throw at it for about $2700...BTW u get to use ur mazda flywheel,pressure plate & starter the only thing that u gonna change is the clutch disk which will have to be ford/mustang stuff....hope this helps

http://gforcetransmissions.com/tran_gt-5.asp

http://kennedyeng.com/other.htm

 

That's exactly the input i'm looking for.. keep em coming!

 

550 hp? HP isn't what breaks trannys...it's torque. And the last time I heard of someone breaking a tranny w/ a 20B was a Russian who broke it at about 750 horses, which is prob 650+ ft lbs of torque.

In the 20B FAQ (see the sticky at the top of the 20B section) it talks about 20B tranny options. One thing I didn't find on it are the diff HKS options, since HKS seems to have these super hush-hush parts that I only come across by accident in a magazine or something. Apparently they have upgraded components available to build the stock FD tranny to withstand more torque, and they also have a 5 speed dogmission. I dunno if they have other options as well, nor do I know how to find out about them, because neither are listed on their USA website.

 

Do you know if the shifter location will remain the same as the Fd's? Also is the T5 the same tranny thats used in an LS1?

 

Unless you are going to alot of drag racing and have to slam through the gears the stock tranny should hold up pretty good, @ one point I toss'd around the idea of changing out my tranny with a T56, but I think I'll be okay with the stock tranny and just having the gears cyrogen'd

 

I've heard good things about the Guru Dogbox tranny, but it's very costly at around $5000 (I think). http://www.gurumotorsports.com/products/gearbox.htm

 

I dont think so.

If you granny your car around, it will be fine. But if you drive it like you built it, it will break. My buddy, Art Baldwin, makes about 350 rwhp and drives his car the way it was made. Not really abusive, but rather road racing and what-not. He has gone through a few transmissions. The input/output shaft is the weak link for the most part.

Depending on the model, most T56 transmissions are rated for under 400 ftlbs of torque. I believe the viper transmission is rated at (a conservative) 550 ftlbs.

My car made 610 ftlbs @ 13.5 psi. It lived through the dynos, and the traction (or there lack of) helps save the transmission as well. But if I were to drive it the way I plan, I wouldn't think my transmission would last.

Hell, 5th gear on the highway: Cruising along at 75 mph. Go to pass another car. Give it gas. Instant boost. Torque pops 5th gear into nuetral. Two transmissions this has occured on. One used but good shape(60k miles), one basically newly rebuilt (less than 1k miles). When I give it gas in 5th gear, I have to rest my hand for a little pressure to ensure it doesn't go into neutral. Ask a few people who I took for a ride at RR.

 

Really? I remember talking to you about that @ RR but I thought you said that happen'd because that tranny was going bad. Huh, well I guess I'll just have to see how this 99 tranny holds up. Thanx for the info Mike.

 

Yeah, I thought that was the reason as well. It was the 1st transmission (60k mileage one). I never anticipated the torque would do that. I replaced it with a rebuilt one, and it did the same. The other transmission works perfect in a 93 RX-7 with about 370 rwhp. No bumping out at all. It is my logical conclusion.

 

Red.. if you had a manual trans from a MKIV laying around would you put that in?

I can have my parts cryo'd here in town for free but there's not much sense if it wouldn't stick in gear.....

 

I think a G-force upgraded T-56 tranny would be a excellent choice for you RED(if it fits). With so much low end torque from your 20b, you could also easily save a little gas on the highway with it's taller 6th gear. Also throw in the fact that they're rated up to 800 ftlbs.

 

red, arent those t56 ratings in first gear, or at some stupid thing. like very underrated. i dont remember where i saw this, probably something dealing with jimlab

HKS makes a dogmission (striaghtcut gears). Never heard of them making beefed up synchro style trannies

os giken and i think cusco and maybe a couple other places make beefed up stock style gearsets called crossmissions (close ratio).
They also have stronger shafts, but only one of them. i forget wether it is input or output. Dragon has one. Don't remember if he could break his or not.
They have 1-3 gear sets and full 1-5 sets. with different gear ratios also so you will have more room to run out the gears and maybe a little more traction.

anyone ever used one of the "crossmissions"?

People keep saying the t56's dont fit, because of weird bellhousings and the starter. I have seen someone w/ a JC 20b cosmo who put a t56 and a big single turbo on his car. Not sure if he ever finished.

-Ben Martin

 

what about the tremec TKO 600?
1,599 with T5 bolt pattern

 

24 hours continuous.

 

So does anyone make a bell housing to fit a T-56 on a rotary? I'm seriously thinking if using an upgraded gforce T-56 for my 20b project. This would be a cheaper alternative compared to the 5k for a guru dog box. Plus I could take advantage of the tall 6th gear for the highway.

I know I know fuel mileage and 20b don't mix but, it would be nice to have the best of both worlds. A T-56 would make that possible. Plus the shifter on these things feel solid.

 

I'd be interested in a bellhousing also. What clutch would you use with this though?

-Destin

 

I have had the same problem that Red Rx-7 is having. After driving my rx-8 3 rotor for couple of month and after finishing red rx7 car and seeing the torque both engine put out. I really didn't think they would break that bad unless I was drag racing. But they do. I have been working with liberty racing transmission on building a 93 fd stock transmission up (so you don’t have to go through all the heached of buying a t56 and adapter plate). We took a liberty Pro racing transmission similar to what you will find in many pro team these days, (which can handle well over 1200 pounds of torque) and we put it in a 93 Mazda FD tranny. Of course all the gears and forks had to be modified using the best material possible in order to get the strongest transmission in the market. Greg @ liberty tranny also spend a lot of time & RD because we wanted a tranny that can be clutches but at the same time be able to downshift (unlike the Pro version for drag cars) there’s over 100 different gear ration that you can pick from. If you are interested on it or want more info, send me an email to acostaracingll@aol.com

 

I'm sure that 1200 ft/lbs would come at a pretty penny. Would this be a cost effective solution compared to a noisy 5k guru dog box? A tranny that holds up to 600ft/lbs would be more than enough for me. Also I understand that your not trying to give too much info (which is why you would rather us e-mail you) but, a little more info (like shift feel, noise, or any other minor details) would be great for this thread.

 

sorry didn't want to give to much info here becuase the Moderator would deleted it, stating that i'm trying to advertise a product. but anyway. the shift feels just like a normal tranny. you wouldn't notice the different unless someone told you. i have install two already one in my rx-8 and one in chuck's rx-7 in michican and so far i haven't notice any noise coming out of the tranny. like i said we work hard with liberty to make shure this tranny for daily driven friendly.

 

here are two picture of the gear set put out. as you can see they are all straight cut and very strong. fully clutchless. with overdrive.

 

.

 

This set was designed to fit in the fd case right? Will they be offering anything for the fc?

-Destin

 

What are the gear ratios? Are there any options on ratios?