I'm pretty sure the S2000 gearbox can't handle much, definitely no where close to the v160 and probably less than the stock FD. The newer RX-8 gearboxes would be a better option, but the shifter is quite a bit forward.

 

I have a 20b FC and FD and they both use the original tranny for the cars. I took out the rear bearing in the FD and the first time I rally slammed it from a standing start, due to torque flexing. You really need to add drivetrain bracing such as Bonzai Racings excellent differential brace. You have to remember that an 800 hp 3rotor is relatively easy to build and that is around what the top 2rotor dragsters are running and you'll never see a stock tranny in one of them. The point is that the instantaneous torque abuse of drag race type driving on a high horsepower car is going to tear the stock drivetrain up however I have never had an issue on the street or a roadcourse, when I wasn't abusive, with either my FC or FD.

 

Hello mate,

I am looking to get a getrag Supra 6 speed gearbox. I understand that you supply an adapter plate to fit supra gearboxes to FD.

Can you contact me please on gillanis@hotmail.com

I need few adapter plates

Thanks

Syed

 

im running at 831hp and with all the research i have done i found that the T56 magnum is the best choice for the price and street. it hold 700 torque in stock trim and you can even upgraded up to 1000 torque with only a couple of changes. the GM gears are very close to the stock FD gears. there are 2 gear rations 1 is 2.66,1.78,1.30,1.00,0.80,0.63, and the other is 2.97,2.10,1.46,1.00,0.74,0.50

 

how is the bell housing project coming along RZ?

 

I should have another prototype within 2 more weeks I will keep you posted this time I sent them a bellhousing sO they could measure it

 

Here is another option and a more cost effective one.

T56 adapter plate that will allow you to run the standard GM t56 bell housing with starter .
At the same time run any after market GM type flywheel/ clutch combinations 8.5 7.5. etc. The nice future about this option, it opens the door so you can run sprung clutch combos for 8.5 .

Cost wise will be half of any other kit or build your own out there.

Thank
Chip U

 

That's nice but that option wont work for me since my engine is moved back 5 1/2". Gm bell housing is too fat for me.

 

Here is some food for your thought ...

 

i just picked up a c4 auto from nc transmission in puerto rico bolts right in then im using a ford 9 inch from grannys out of concrete washington good for a 1000 hp

 

seems to me like its between a t56 and the getrag then...i know a couple of guys are running the t56, but i've had a difficult time finding someone runing the v160.
Thoughts on both? Crispness? Feel? Torque Rating? Ease of fitment into various platforms? Im sure all of these things come into effect when deciding. Just curious as to what owners of the different setups have to say...

 

I did alot of research before going with the T56 magnum. it's the best transmission out there. Price brand new its around $2800-$2900, stock it can handle 700 torque, 6 speed transmission and parts for it are very available. Also if you would like to handle more than 700 torque several companies offer upgrades up to 1200hp and even with the best upgraded you are probably looking at $6000-$7000 for the entire trans and it would be a transmission that can hold 1200hp and be completely streetable transmission. I considered the V160 but for a new one it cost around 6000+ plus it probably can only handle around 700hp reliable, but when they break they are very expensive to fix and not alot of people know how to work on them and the ones that know are alot of $$$$$$$. so for me it was a easy choice to go with the t56 magnum. also im working with a company to develop a custom SFI certified bellhousing that will bolt on to the t56 magnum and to the 3 rotor. so it would be a bolt on kit. also on all other parts so it would be a complete bolt on kit for the FD's. Hope it helps.

 

I'm going to input on this since i've been using the T56 successfully for over a year.

the getrag is know to handle 1000hp no problem but is also a lot more expensive. I have a t56 from a GTO upgraded with the kit from tick performance and i have never had a problem. i've launched the car with the 2 step, shifted @ 8500rpm, beat the heck out of it and still shifting fine. i actually had it open and inspected and it's like new inside. i think the entire swap cost close to 4k-4.5 and is the best option for the 20B swap..lots of parts to customize it how u want it.

save time and money and go this route as it has been proven by numerous members on this forum.

 

Gentlemen...exactly the kinds of responses im looking for.

 

BewTew, how would you say the tranny feels when shifting. Crisp? Accurate? I do believe i've read through your thread a couple times but cant remember off the top of my head. Ease of repair and initial costs are very important factors to consider. Thanks for the insight.

Anyone running the Getrag to offer a comparison?

 

i have been on the supra forums and that is one of the main complains,of the getrag are rebuilding them its around 1500-2000 and a brand new trans runs you around 5-7k. Also if you are interested on going the T56 route i have a torque bar brand new for the t56 conversion. its a bolt one same one that bewtew has on his car. For the money the t56 is easy to rebuild, upgrade, parts, many swaps have been done on FD's and great transmission.

 

Great Thread Guys!! Im planning the R154 swap into mine with in the next few months...

 

It's looking like a domestic transmission is the most cost effective solution.

I'm interested is hearing more about that ChipMotorsports adapter plate.

 

Interesting..american muscle meets rotary POWA!
I wonder what kindof difficulties i would encounter trying to adapt a magnum t56 to the rx8 with a 20B...Time to go talk to Rgonza!

Any complaints/praises on how the t56 feels compared to the native rx7 five speed/miata six speed in the rx8?

 

I have been working with a company to develop a SFI bellhousing to mate to the t56 magnum and also to the 20b without a adapter plate i should be receiving the new prototype this week. I have some pics of the 1st prototype but the circunference was too small. I will keep you posted. Also the benefit over the adapter plate is that the bellhousing also acts like a scatter shield since its SFI certified. and no customization, it would be a complete bolt on, we are working on a full kit just to drop it in a FD.

 

RZ, when do you expect to have the 'final' prototype complete? Pricing yet?

 

i should be receiving the new prototype in the next couple of weeks if that one fix great then that should be it. Price still needs to be determined we dont know until final product is made. I will keep you posted. Here is a pic of the bellhousing on the transmission.

 

Nice! What wall thickness is the bell housing?

 

Does the T56 feel like you are shifting a truck compared to the FD or FC??

 

I'm not an expert, but I have noticed that different cars utilizing the T-56 don't always feel the same. (some more notchy than others)

But that might be a mind over matter issue.

Every T-56 I have the oppertunity to run through has never felt like a truck transmission.