[Ravenseal]

Originally Posted by Geighty7

How made are you on a scale from 1-10 that I don’t have to pay a dime and still bang more gears in an hour than you do in 3 years?

Strong words from a poser who thinks blowing up his transmission is "driving hard".

[Geighty7]

Originally Posted by Ravenseal

Strong words from a poser who thinks blowing up his transmission is "driving hard".

Nobody blew up their trans. Once again you’re making things up and sounding stupider and stupider with every post.

It’s actually hilarious watching yourself dig you’re own stupid grave

[Ravenseal]

Originally Posted by Geighty7

Nobody blew up their trans. Once again you’re making things up and sounding stupider and stupider with every post.

It’s actually hilarious watching yourself dig you’re own stupid grave

It's 2024. You can keep banging dudes hard all you want.

[BradMX5]

I know we’re talking trannies here but pretty sure you’re thinking of the wrong ones.

[reallymarkedup]

Why do I keep ending up here? I know better than to click on this thread.

[dienstag]

What does winning an argument like this even look like? Maybe there are no winners, or maybe we all are? Maybe the real winners are the gears we banged along the way?

[BroDoze]

This thread has potential…

[Geighty7]

Originally Posted by Ravenseal

It's 2024. You can keep banging dudes hard all you want.

Haha maybe I will don’t tempt me

[Geighty7]

Originally Posted by BroDoze

This thread has potential…

It’s the best thread on here cmon man

[Sleeper]

Still picking the 6MT over the ZF8 any day.

[BgsDks]

And to think I expected diplomacy and genteel discourse in BMW Welt.

[Geighty7]

Originally Posted by BgsDks

And to think I expected diplomacy and genteel discourse in BMW Welt.

Negative ghostrider

[BgsDks]

Originally Posted by Geighty7

Negative ghostrider

My years on Mustang6g will then help me navigate this jungle.

[MisanoblueZ4]

This thread is a banging good time!

[D.Yooras]

Originally Posted by BradMX5

Just one for me. I traded for the ND2 after that.

They did 4 each. One was even a built one from a cup car.

It was a car originally designed for the 1.5l engine. Last minute their US CEO pushed them to throw a 2.0l engine in it because in America we don’t like tiny engines I guess.

The transmission was already designed close to breaking point (weight savings) so throwing more power at it wasn’t the move.

There are two issues I see here having familiarity with transmissions and the production of them. Mazda did all of their testing around the 1.5L which, if what you're saying happened is indeed what happened (which is highly likely), then the transmission was developed around that engine package with lower torque thresholds.

The other possibility, and/or contributing factor, is that Mazda is having problems with heat treating the internals in production. In Spec Miata, Mazda starting offering "new" transmissions for sale which are effectively a reproduction of the original transmissions (which was originally for the RX7 so it was actually overbuilt for the tiny miata motor) which blow up on track in otherwise stock cars (drivetrain wise). These transmission out of original production NEVER have that issue, even pulled from donor cars with 250k+ on the ODO. You buy a "new" transmission and a few races later you're being hauled back by the wrecker.

Heat treating parts, especially transmission parts, is a very fine balancing act and, if you get it wrong, the result is the same. A gear that is heated too long will not have enough "give" and will start cracking, allowing teeth to break off. Don't heat it long enough, and you'll have a gear that's too soft which allow the teeth to fatigue (from excessive movement) and will eventually fall off and blow the transmission up. That's not even mentioning the other processes and timing surrounding the process

Right now, if the company making that NA/NB transmissions is the same one making the ND transmissions, it's likely they have a heat treating problem. Honda CTR's also like to shell third gear on the track for what I can only imagine is the same problem (too much torque and/or bad heat treat), especially considering the CTR transmission is, for the most part, the original K series transmission with an oil pump sitting over the 3/4 gears.

I think the bigger issue here is that all the manufacturer thought us neanderthals would have put down cave man clubs and bought cars with automatics by now, so they stopped developing manual transmissions back in the early/mid 2000s. What they don't understand is that I think I speak for most of us when I say that, I'm not going to buy a small sports car with a slushbox automatic. A proper DCT, I can be convinced if a manual option doesn't exist but this whole, "omg lets stick a ZF8 in every car" thing needs to stop or we'll all end up having to buy Mustangs or GM products.

The best part is the G8Xs automatics are tuned so they have the same lurchy low speed behavior as a DCT even though they aren't. Why the hell would someone want a slushbox with the same low speed drawbacks as a DCT but without the shifting performance? /rant

[aerobod]

Originally Posted by D.Yooras

There are two issues I see here having familiarity with transmissions and the production of them. Mazda did all of their testing around the 1.5L which, if what you're saying happened is indeed what happened (which is highly likely), then the transmission was developed around that engine package with lower torque thresholds.

The 6-speed SkyActiv transmission must be the issue here, as the S5A 5-speed transmission Mazda used in many Miatas up to the NC is able to take decent power levels and take lots of abuse. It is still used (typically in combination with 2.0 Duratec engines) in various British specialist cars with power levels up to 220bhp stock.

[BradMX5]

Originally Posted by D.Yooras

There are two issues I see here having familiarity with transmissions and the production of them. Mazda did all of their testing around the 1.5L which, if what you're saying happened is indeed what happened (which is highly likely), then the transmission was developed around that engine package with lower torque thresholds.

The other possibility, and/or contributing factor, is that Mazda is having problems with heat treating the internals in production. In Spec Miata, Mazda starting offering "new" transmissions for sale which are effectively a reproduction of the original transmissions (which was originally for the RX7 so it was actually overbuilt for the tiny miata motor) which blow up on track in otherwise stock cars (drivetrain wise). These transmission out of original production NEVER have that issue, even pulled from donor cars with 250k+ on the ODO. You buy a "new" transmission and a few races later you're being hauled back by the wrecker.

Heat treating parts, especially transmission parts, is a very fine balancing act and, if you get it wrong, the result is the same. A gear that is heated too long will not have enough "give" and will start cracking, allowing teeth to break off. Don't heat it long enough, and you'll have a gear that's too soft which allow the teeth to fatigue (from excessive movement) and will eventually fall off and blow the transmission up. That's not even mentioning the other processes and timing surrounding the process

Right now, if the company making that NA/NB transmissions is the same one making the ND transmissions, it's [...]

I believe the Miata was built more around the manual and not automatic. Same with the new GR86. They’re both one of the few cars where the automatics are a good deal slower than the manual lol.

I blew 3rd gear in my first 5k miles of the car. By the time I got my ND2 they were on revision 5 of the transmission and I believe the 2019 and 2020 are the ones to get. They changed something in them after that and they’re having issues again. Someone posted the schematics from a 23 and it’s missing a part that the 19 had.

Had they designed the car with the 2.0l from the beginning I’m sure they would have designed a slightly beefier transmission but I’m sure would still have issues handling any minor power upgrades.

Would be nice if they over engineered like BMW but that would mean a chunky Miata.

I absolutely love mine and I know I’m going to miss it. Trying to go into the M2 without comparing it to the Miata because I know it’s not a fair comparison. At least I know someday in the future I’ll get into another even with their glass transmissions

[BradMX5]

Originally Posted by techwhiz1

That sounds like a driver issue.

Except it’s a known issue with the car and there’s a lot of people with the same experience.

The 2016 was definitely the worst of them.

Almost 80k miles on my 2019 and 0 issues.

[DeadlyDrop]

Any update on this matter? Geighty7 I also have 6MT and was following your issue closely. Were you able to figure out if issue actually was bent shift fork? How hard were you shifting? Do you tug the gear in anticipation of next shift? (ex. pulling down when its in 3rd gear before pressing clutch down)

I am not asking this question to derail the thread but to learn from this lol just want to know how aggressively you shift in this car, I been driving manual car for most of my life and I usually have too much mechanical sympathy to slam gears, since synchros do need some physical time to mesh tooths in between the shift.

[Geighty7]

Originally Posted by DeadlyDrop

Any update on this matter? Geighty7 I also have 6MT and was following your issue closely. Were you able to figure out if issue actually was bent shift fork? How hard were you shifting? Do you tug the gear in anticipation of next shift? (ex. pulling down when its in 3rd gear before pressing clutch down)

I am not asking this question to derail the thread but to learn from this lol just want to know how aggressively you shift in this car, I been driving manual car for most of my life and I usually have too much mechanical sympathy to slam gears, since synchros do need some physical time to mesh tooths in between the shift.

It ended up being a super weak gear selector guide rod not wanting to slam gears. They offered to replace it with warranty but it’ll likely keep doing the same thing as BMW has not upgraded their manual platform since the first iteration of the F-chassis.

This car doesn’t like to slam gears like a Tremec, but can. You just need to finesse it perfectly. I still don’t recommend it. Thankfully I did not get all the way in 2nd at the top of 3rd when moving into 4th, I just bounced right off it and grinded the gear decently. Engine spun to 7.2k but limited on the limiter.

No damage to trans or engine that we got from code and it drives normally and I’ve gotten on it plenty since that happened.

The solution would be a new gear selector like a SSK or the CAE. This will void your warranty with trans related future issues that may arise but will mitigate this flimsy issue.

TL;DR: S58 too fast for 6MT components, not the actual trans though. Temperamental and likes to be driven hard but not drag racer hard, but will if you really finesse the car and have perfect clutch drops.

[daddyjaxx]

Money aside, can we upgrade/rebuild our 6MT so we can reliably bang gears?

If someone were to build the world's fastest quarter-mile G8X ZF 6MT, what would be the necessary upgrades for the transmission to survive?

[BradMX5]

Originally Posted by daddyjaxx

Money aside, can we upgrade/rebuild our 6MT so we can reliably bang gears?

If someone were to build the world's fastest quarter-mile G8X ZF 6MT, what would be the necessary upgrades for the transmission to survive?

My guess is a clutch and SSK