Tranny
#1
Rotary Enthusiast
Thread Starter
Tranny
Same as my radiator thread. I searched and found a lot of people claiming a lot of different transmissions were the best for the 20B.
What do people think...Clutchless?
What do people think...Clutchless?
#2
Rotary Enthusiast
this of course my good man depends on what youre going to use the car for , is it going to be drag,track or street i think most people doing this are using the stock turboII or stock 3rd gen gearbox , seems to hold fine to a certain power level
some guys where talking about a ford transmision not shure though
some guys where talking about a ford transmision not shure though
#4
Safety Guy
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stock FC TII trans is fine for up to 500 HP or thereabouts for street/track. Drag racing is another animal is you are essentially trying to break everything so the requirements are a bit...more.
#5
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Yeah, obviously it'll also matter how you drive the car. If you go easy on it, the stock stuff will be okay no matter how much power you're making, but if you throw on slicks and try to launch the car hard with gobs of power, then obviously you'll break things rather quickly.
I always used to laugh when John Shepherd would talk about how he "babied" his tranny on his AWD Talon. It's the fastest DSM out there, running crazy times, and he's talking about how he babies it because he runs a modified stock tranny. Sure doesn't look like he's babying it!
I always used to laugh when John Shepherd would talk about how he "babied" his tranny on his AWD Talon. It's the fastest DSM out there, running crazy times, and he's talking about how he babies it because he runs a modified stock tranny. Sure doesn't look like he's babying it!
#6
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Thread Starter
My plan right now is the drive the car, with occassional trips to Atco, and at some point do a little auto x. So basically I need something that is all around multi purpose. Right now its probably just another stock tranny because I am starting to grind going into 5th. However I really like what I have read about the Greddy trans, but I think it was discontinued and cant find the link I had it on.....Anyone ever seen/driven one....nice prce tag on it too.
#7
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I ran a S6 RX7 box in my 20B JC Cosmo, previous to me obtaining it the box had been behind a 600+HP supercharged 20B in a 2nd Gen running slicks at the drag strip for quite some time, box was fine.
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#11
I read somewhere on the forums about it being unfriendly to higher revs because of its synchro design, but I am no expert on the T56.
If I were in a situation to ditch the stock gearbox, I would go with a V161 (the MKIV supra transmission with shorter ratios). Guess the big drag is the custom bellhousing.
If I were in a situation to ditch the stock gearbox, I would go with a V161 (the MKIV supra transmission with shorter ratios). Guess the big drag is the custom bellhousing.
#15
Safety Guy
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I've driven a T-56 on a '96 camaro that was rebuilt with stock ratios but hardened gears and it handles a 10K redline no problem making 900 HP AND 900 torque to the wheels! Don't know how a stock box would hold up but why wouldn't you rebuild it anyhow for this application???
#17
You guys need to check out this thread: https://www.rx7club.com/3rd-generation-specific-1993-2002-16/t56-tranny-fd-609461/ If you go the T-56 route, you need to use the double/triple synchro setup, steel fork, and upgraded input shaft. It's all discussed in the thread. Long read, but worthwhile. And yes, the built T-56s can handle very high rpms and very high torque levels.
Re: the Greddy (and other dogboxes), I'd read these first...
- https://www.rx7club.com/forum/showpo...&postcount=165
- https://www.rx7club.com/20b-forum-95/jerico-5-speed-20b-155219/
As you can see, there's no dogbox you can get that will do the trick w/o an ENORMOUS amount of custom work to fit it into the FD, plus a $10,000+ tab for the tranny itself (ie Holinger). Reason being, all the ones that fit in the FD case a) can't handle the torque, and b) will fail due to the casing flex at higher torque levels.
Basically, the answer is there currently is no REAL answer for serious hp levels. Having said that, however, mirabile my honest advice for you is to keep your power levels LOW, being that it's an early series block. In fact, the top 20B builders in the country (professional racers and consultants for Mazda) testify the block is only good for about 600 - 700 hp at short spurts - and that's assuming it's built and *clearanced* properly, rotating assembly is balanced, the correct seals and rotors are used, and the boost level isn't too high. And even then, you're looking at e-shaft and HOUSING flex past 8K rpm. So honestly, I'd stick w/ a stock tranny if I were you, keep the power level around the 450 mark, and you'll pretty much be fine.
That's my $0.02. But I mean hey, what would I know. It's not like I did any reseach or anything
~Ramy
Re: the Greddy (and other dogboxes), I'd read these first...
- https://www.rx7club.com/forum/showpo...&postcount=165
- https://www.rx7club.com/20b-forum-95/jerico-5-speed-20b-155219/
As you can see, there's no dogbox you can get that will do the trick w/o an ENORMOUS amount of custom work to fit it into the FD, plus a $10,000+ tab for the tranny itself (ie Holinger). Reason being, all the ones that fit in the FD case a) can't handle the torque, and b) will fail due to the casing flex at higher torque levels.
Basically, the answer is there currently is no REAL answer for serious hp levels. Having said that, however, mirabile my honest advice for you is to keep your power levels LOW, being that it's an early series block. In fact, the top 20B builders in the country (professional racers and consultants for Mazda) testify the block is only good for about 600 - 700 hp at short spurts - and that's assuming it's built and *clearanced* properly, rotating assembly is balanced, the correct seals and rotors are used, and the boost level isn't too high. And even then, you're looking at e-shaft and HOUSING flex past 8K rpm. So honestly, I'd stick w/ a stock tranny if I were you, keep the power level around the 450 mark, and you'll pretty much be fine.
That's my $0.02. But I mean hey, what would I know. It's not like I did any reseach or anything
~Ramy
#18
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Originally Posted by rarson
What was the engine attached that was making 900 whp and spinning to 10k??
#19
Rotary Enthusiast
Thread Starter
If only I would be happy with 450. haha. Anyhow, I appreciate the advice, and will most likely break some stock ones. Thing is, if the engine breaks, I will rebuild it.
#20
Well breaking stock ones isn't a prob, cuz they're cheap to rebuild, and easy to source. But replacing gears from a custom tranny (HKS, Greddy etc), good luck. Pretty much everyone is slowly getting out of the FD scene, simply due to age...
And I hope the block doesn't break/blow. Rebuilds on 20Bs are rediculously expensive, and some parts are EXTREMELY rare (irons, e-shaft).
And I hope the block doesn't break/blow. Rebuilds on 20Bs are rediculously expensive, and some parts are EXTREMELY rare (irons, e-shaft).
#21
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Originally Posted by FDNewbie
Basically, the answer is there currently is no REAL answer for serious hp levels. Having said that, however, mirabile my honest advice for you is to keep your power levels LOW, being that it's an early series block. In fact, the top 20B builders in the country (professional racers and consultants for Mazda) testify the block is only good for about 600 - 700 hp at short spurts - and that's assuming it's built and *clearanced* properly, rotating assembly is balanced, the correct seals and rotors are used, and the boost level isn't too high. And even then, you're looking at e-shaft and HOUSING flex past 8K rpm. So honestly, I'd stick w/ a stock tranny if I were you, keep the power level around the 450 mark, and you'll pretty much be fine.
That's my $0.02. But I mean hey, what would I know. It's not like I did any reseach or anything
~Ramy
What is this based on? I was under the impression that the only difference between the early and late 20Bs was the thicker castings on the irons, is there something else I didnt know about? I was planning to pin mine and hoping to make around 750whp, i hope this is still going to be possible...
Thanks
Pat
#22
Originally Posted by patman
Ramy,
What is this based on?
What is this based on?
I was under the impression that the only difference between the early and late 20Bs was the thicker castings on the irons, is there something else I didnt know about?
I was planning to pin mine and hoping to make around 750whp, i hope this is still going to be possible...
Thanks
Pat
Thanks
Pat
Of course, you *can* make more power on the block, and it *has* been done. But I remind you of 2 things: 1) Just because you can doesn't mean you should. There's no telling of how long it'll last, and rebuilding a 3-rotor is not just cost-prohibitive, but many of the parts are very difficult to get ahold of. So even if you have the money, you may not even be able to find the parts. 2) Some of the people well known for making tons of power on 3-rotors are also hardcore racers, which tear down their motors quite often. I have yet to meet someone on the forum who's interested in maintaining that kind of maintenance schedule
Just something to think about...
~Ramy
#23
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well...i think i will continue as planned then...if i do break it, hopefully it will be after i graduate, and i can afford to just get a kiwi kit or something. I wasnt planning on running 750 hp all the time, just at max boost for race days or dyno pulls. 500 or so will be street trim. I never planned on revving over 8k anyway, so thats no problem. The motor will be built by me, so forget about the experience thing. You might think thats dumb, but I've built every single part of my car, and the experience is half the fun for me.
#24
Rotary Enthusiast
Thread Starter
ooooohhhh Ramy. Dont worry so much.
As always your insight is appreciated. It would be too bad to have to rebuild it, but though parts are expensive, I have not found them all to hard to find. Just need to have the time to look.
Getting out of the FD scene? If the scene has been "shrinking" thats news to me. I guess you would know better, since your business is based around it.
Anywho, this thread was based around the best possible choice for transmissions, and what people had done with their 20Bs. The feedback has actually been pretty good before the digression.
Final answer Ramy, what Tranny would you use on your 20B?
As always your insight is appreciated. It would be too bad to have to rebuild it, but though parts are expensive, I have not found them all to hard to find. Just need to have the time to look.
Getting out of the FD scene? If the scene has been "shrinking" thats news to me. I guess you would know better, since your business is based around it.
Anywho, this thread was based around the best possible choice for transmissions, and what people had done with their 20Bs. The feedback has actually been pretty good before the digression.
Final answer Ramy, what Tranny would you use on your 20B?
#25
I wasnt planning on running 750 hp all the time, just at max boost for race days or dyno pulls. 500 or so will be street trim. I never planned on revving over 8k anyway, so thats no problem.
The motor will be built by me, so forget about the experience thing. You might think thats dumb, but I've built every single part of my car, and the experience is half the fun for me.
Originally Posted by patman
well...i think i will continue as planned then...if i do break it, hopefully it will be after i graduate, and i can afford to just get a kiwi kit or something.
Originally Posted by mirabile
ooooohhhh Ramy. Dont worry so much.
I personally think it's very unfortunate that one too many a people take 20B building too lightly, only to realize how serious they *should* have taken it the first time around. I don't want to belong to that camp. The guys down under have TONS of experience w/ 20Bs (as well as rotaries in general), and are simply *years* ahead of us when it comes to these things. So when they speak, I really do listen - esp. when they're professional racers who have been in the game for *years* and are sharing with me their invaluable experience on what went wrong and what NOT to do, and how to do it right.
As always your insight is appreciated. It would be too bad to have to rebuild it, but though parts are expensive, I have not found them all to hard to find. Just need to have the time to look.
Getting out of the FD scene? If the scene has been "shrinking" thats news to me. I guess you would know better, since your business is based around it.
Anywho, this thread was based around the best possible choice for transmissions, and what people had done with their 20Bs. The feedback has actually been pretty good before the digression.
Final answer Ramy, what Tranny would you use on your 20B?
~Ramy