Stronger Transmission Internals, Wishlist

[Speedhead]

Hi,

I am currently investigating the topic with regards to developing stronger transmission internals. When you're able to send 520 Nm into the tranny, that question comes by itself...

Here I would like to ask the community to shed some light on the top problem spots, with regards to:
- strength/torque capability
What are the weak spots?

- what additional optimisation can be done, especially regarding forced induction applications (DIT, FA20D with turbo)
i.e. Gear ratios, shifting process (not really convinced by the shifting time/smootheness.

Together with a partner, we are currently planning to develop complete gearkits in 2versions:

A) synchronized daily driver version capable of 600 Nm
B) fully sequential racing spec gearbox with even higher torque rating

So any input is very welcome

[tahdizzle]

[cdrazic93]

I am verrrryyyy interested in this thread...

From what I have read about this 6 spd is that its like glass.

First off, syncros are usually always a weak point.
Secondly, when the final gear is lowered there is less stress on the gearbox
thirdly, those who push the car to its limits seem to sheer 4th gear in particular.
Finally, those who have opened the manual 'box up have noted that there is tight living quarters in there for the gears, unless you have an iconel gear set i have no idea how your going to fix the stock box holding capacity.

Some describe a grinding between 1st and 2nd in cold weather. Im going to chalk that up to trans fluid as well in case you wanted to look at that.

Food for thought.

[continuecrushing]

what if each gear had a turbo? To help with speed

Or, if the gears were made of unobtainium?


Also, you'll make far more money silencing the "crickets" that so many people are "concerned" about than a stronger tranny

(hehe)

[spitfire481]

My built trans should be done before summer. A lot of things internally are being replaced/upgraded and geared more for big power, turbo setups. I'll be sure to test it hard with around 600whp and 26x10.5x15 Mickey Thompson radials haha

[Shit Luck]

Why not just cryo the stock parts???

[rlpaul]

Originally Posted by Shit Luck

Why not just cryo the stock parts???

Didn't @Reaper do this? With not much success? I'm pretty sure somebody did if not him.

[Hyper4mance2k]

The problem with the trans is it's the same unit in the V6 Camaro. It's just a mass produced cheapy. It gets the job done where it needs too w/o being too expensive.
If you want a good trans get a T5WC or a Getrag, or a t56, etc. Bell housing adapters are a much more feasible means to an end then working on this slouch of a transmission.

[Reaper]

Originally Posted by rlpaul

Didn't @Reaper do this? With not much success? I'm pretty sure somebody did if not him.

I did. It didn't work.

[Jeff Lange]

Originally Posted by Hyper4mance2k

The problem with the trans is it's the same unit in the V6 Camero. It's just a mass produced cheapy. It gets teh job done where it needs too w/o being too expensive.
If you want a good trans get a T5WC or a Getrag, or a t56, etc. Bell housing adapters are a much more feasible means to an end then working on this slouch of a transmission.

I know this is an old thread, but if it was the same transmission as the Camaro it would probably be fine. The FR-S/BRZ transmission isn't related to any Camaro transmission at all, and is physically half the size of the Camaro V6 transmission.

Jeff

[GsxrMe]

It's called a custom bell housing and the TREMEC T56. Vendors and developers have been talking about making something a drop in kit for years but nothing happens. Just over priced gear sets with 1 year warrantys.

We can use a hydraulic throw out bearing and ditch out shift fork that tends to break at the same time.

The supra trans is an option but the cost for the kit and used transmission isn't worth it for 80% of us.

[Hyper4mance2k]

Originally Posted by Jeff Lange

I know this is an old thread, but if it was the same transmission as the Camaro it would probably be fine. The FR-S/BRZ transmission isn't related to any Camaro transmission at all, and is physically half the size of the Camaro V6 transmission.

Jeff

Quoting a months old post does nothing to better this thread, unless you think starting a fruitless argument somehow makes a contribution to the wealth of knowledge. The Rx8 and the NC Miata AZ6 transmissions look nothing alike, but they are nearly identical internally. I was told by multiple aftermarket parts manufacturers (a clutch manufacturer included) that the Aisin transmission in our car shares its architecture with the Aisin trans in the V6 Camaro. Take that for what you will...

[Jeff Lange]

Wasn't intended as an argument, just wanted the correct info out there. For future people like me that stumble across the thread looking for info.

For what it's worth the Aisin trans in the Camaro was an AY6 (also used in the CTS, IS250, Tacoma, FJ Cruiser, Mark X GRMN, etc.), which is a tailset design and has a fully-supported output shaft and an integral bellhousing. The FR-S/BRZ used the smaller AZ6, which is an older, more conventional design.

They are both made by Aisin though.

Aisin AZ6:


Aisin AY6:


Side by side (AZ6 on the left, AY6 on the right):


Jeff

[Hyper4mance2k]

My bad the Camero got the AY6. I thought it was also an AZ6.
Still AZ6 has been unable to hold up in just about everything it's been put in.