Good guestion for the room. Racing Beat, in their wisdon, chose to use an automatic trans for their 2nd Gen Tubo Vert . Argument is auto trans does a better job keeping the turbo spinning. Makes sense.

In my future is a T2 engine retrofit into my Vert. I'd like to follow Racing Beats example.

Issue - a 2nd Gen NA Auto trans obviously wouldn't hold up to the power of a T2 engine. I could possibly obtain a J Spec T2 Auto Trans, but repair part availability is an obvious issue.

Has anyone tried to retrofit a 3rd Gen Auto trans into a 2nd Gen?

With just substitution of a 2nd Gen rear counterweight I assume a 3rd Gen Auto Trans would mate to the engine. But:

1. What about the rear mount?
2. What about the shifter linkage?
3. Even more, are any of the various 2nd Gen driveshafts correct length to connect to the rear diff?

Certainly something to ponder.

 

Call Chris Ott from Rotary Performance....he's got a TII vert and should be able to handle your Q's.......972-530-3335.....Personally i would just go with a manual......parts are available and less custom fabrication should be made

 

Custom fabrication is what I'm hoping to avoid. Otherwise, 5-speed is the way I'm going.

 

It basically depends on how you want to use the car. The auto trans wouldn't make a very good road racer. But it works ok for auto cross. It makes for a very quick street gt car.

One annoying aspect of the 2nd gen auto is that it is controlled by its own computer. The stock US software was designed to keep a relatively low torque NA car on the top of the torque curve. So when you put a turbo motor in the car the shift points are wrong. It wants to downshift too much. Maybe the computer can be reprogrammed. I don't know. The lock out feature can be used to control the shift points.

Rob

 

Probably want to swap in the 1988-1991 929S auto trans instead.

 

The FD Auto is the same as the MPV Minivan but w/ different ecu programing - but why not just use T-II auto?

Mariah has built a Convert w/T-II auto. The ECU wiring is a pain because the harness is not set up for an Auto

 

I thought that the NA Auto was the same tranny as the TII auto...

 

Off the top of my head; I would think that the Jspec auto and Jspec TCU is acutally gonna be your best choice. Bolt in factory style and factory drive shafts the right length appeals to the minimalist in me.

Unless it is completely worn, Auto trannys generally not need too many replacement parts and those that do would be fairly interchangeable with the 929s and the US spec 86-88 RX7 tranny.

Plus, the Turbo Auto vert was available in Japan through 92 as a 92 production run even though the FD was also available in Japan at that time, so there should be plenty available.

The other thing that comes to mind is that are we convinced that the Jspec Turbo Auto is really different than the US spec NA tranny?

 

Anybody out there have any experience with a Turbo Auto Trans?

 

The TIIs were NOT available in an automatic, only 5 speed. The FD had an auto as fast autos were popular in the 93-now years.

I suggested the 929-S trans as it's rated for 200-220HP.

 

I dunno what's all the hoopla about the auto-trans.
RB probably went that way cause it was more of a cruiser than a real "sports car".

The turbo (manual) trans is one of the strongest production transmission made.

Don't even bother trying to find a J-Spec auto turbo trans, the car will end up a slug (compared to a similar 5-speed manual).





-Ted

 

Does the bolt patter of the trans housing match up to the 13B Wankle?

Also, what about rear trans mount and driveshaft. Both fabrication chores?

 

You are incorrect. They were available everywhere but here in the states, with a Auto on the turboII.

Check out Mazda japans site, their are pictures there of them, as well as production specs

 

I have.

Rob

 

Check your PM's.

Thanks.

 

Icemark,

Interesting, bet they were a POS and killed 1/4 mile times.

Would be interested to know how they were tuned. If all your power is above 2500 rpms in any gear, wonder how they compenstated?

 

yeah, i got a few RX-7 books when i was in japan and they had reviews of like every kind of FC. including the auto T2's...they seemed pretty slow. about what an n/a would do in the 1/4.......very high 15's

 

Custom mount a tiptronic ;-)
but enough dreaming