which transmission for 20b?
 

is the factory fd gear box strong enough for a 650-700hp 20b for street use and tracks on the weekend? I considered a viper t56 but im concerened about getting the gearing right. also I prefer the 5 speed , but not if I have to rebuild it every time i turn around.

try the Supra MKIV Getrag tranny.

call Carlos Lopez // CLR racing, he sells a adapter kit so you can fit the tranny on a 20b

hi,

Does anyone know how the Supra gearbox goes in a FD tunnel? From memory they are a substantially bigger gearbox than the FD 5-spd and would need fairly substantial mods to the tunnel and PPF??

cheers,

Rob.

CLR Getrag V160 to Rotary Kit
 

It's been quite a long time since I've been on the forum.

A friend/ customer informed me that ppl. were looking for this information.
These pics illustrate how the Supra 6 speed box fits within the Tunnel of the Fd.
This installation illustrates a 20b on a stock sub-frame.
The engine in it's present location sits slightly higher than stock or substantially higher than those using aftermarket sub-frames, and still there is plenty of space. The Tunnel is stock.
The PPF. must be replaced w/ a Torque Arm like what the V-8 guys use.
A Transmission mount and custom Drive shaft must be fabricated

http://smg.photobucket.com/albums/v1...h_P1016136.jpg

http://smg.photobucket.com/albums/v1...h_P1016111.jpg

http://smg.photobucket.com/albums/v1...h_P1016110.jpg

can you post more information on this setup please GT1?

Here are larger images


Attachment 710098

Attachment 710099


Attachment 710100


There is adaquate space both on the Tunnel both on top of the gearbox and below.
On this instalation, there are (2) two 3" inch down pipes in the lower right side, one for each Turbo.

how much is the kit?

Here are pics of the full Kit on a rather large rotary engine !

Attachment 710108


Attachment 710109


The Kit consist of exactly what U see :
The adapter plate, a custom built "Tilton" style Starter, the Starter mount, and all the hardware.

It requires the use of the smaller diameter "NA" style aftermarket Flywheels.
The larger Turbo flywheel will NOT fit within the Getrag's Supra type specific bell housing limitations.

There are countless Manufactures of these type of Flywheels, ie:
Fidenza, Tilton, Quarter Master, Bilington, Mazda-speed, ACT, and so on.

Clutch packages are also abundant in many different configurations like dual disk, triple disk, 8.5" diameter, 7.25" , 5" or even 4.5"
I have heard of 1 particular 10" dual disk setup ... BUT have not confirmed it.

Also, there are many types of friction materials available to suit any particular need, application or budget.
Anything from Organic linings to Ceramics, to Sintered Iron facings to full Carbon/ Carbon.

I will try to post this information on all the other threads on the subject of transmission options for High powered Rotary engines.

Price for the Kit is: $ 1795.oo + Shipping.
You must provide the gearbox and the Clutch & Flywheel package.

Kits are available and in stock.


GT1-20b
CLR. Motorsports Ltd.
(305) 235 3696

man.. that's like a 7k upgrade for a tranny. i def have to think about this one

does the shifter line up in the stock position? can you post some interior shots to confirm please?

Also, I noticed the pictures do not include a mount for the transmission. I would think for the price, a solution for mount this transmission to the stock fd mounting spots would be included, otherwise this is an incomplete solution. Just my opinion tho.

I am not trying to take away from Carlos.. But I do think there are other options besides the Supra 6speed.

I'm personally interested in the SMG from a BMW M6 (7 speed sequential shift) & the viper T6060 transmission. The M6 SMG has its clear advantages but like the supra trans, it's about $4k (used). Seems like the T6060 transmission would be a good solution too in addition to the plethora of options.

^--- +1

What he said..

GT1-20b, why does this engine use '74-'75 housings?

i would speculate those pictures are of a dummy block. probably for test fitting the trans.

couldnt use 74-75 housing with 20b irons anyway.


EDIT: on second thought, the completed engine is a 4 rotor, and doesnt have the 20b mid piece. Perhaps he constructed the 4 rotor with pre 86 irons?

Looks like 12a housings as well.

does a T2 or FD tranny fit the 20b?? jus asking...

Fairly certain.

Also, how much abuse are you going to put it through? I know a guy down here that has a 600whp FD that he dragstrip launches (on full slicks) through the stock drivetrain, and it doesn't break (well not all the time :lol:)

all rotaries since 74 have had the same bellhousing bolt pattern. only exception being the fd auto 13B, which had an extra bolt hole.

So yes, it will work.

So the length and spline of the supra transmission shaft fits without modification?

do you have any more pics of this engine??? looks like a 4 rotor to me

ok cool, cuz i will be beginning 3 Rotor FC project sometime next month and i have a FD and T2 tranny in my garage just sitting.. so i will try and bolt one of these up, and my car will be only a weekend drifter..

Has anyone tried using the Honda S2000 transmission as it can handle high rpm & hp and can also fit within our transmission tunnel. It has to be one of best 6 speed trannys available.

can it really handle 500+ ft-lbs of torque? I havent heard that, and it would surprise me if true...

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

transmission
 

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...

T56 Magnum
 

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?

getrag
 

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?

T56 magnum
 

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?

T56 magnum
 

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.