correct, or a mechanical throttle blipper, the transmission control unit does output throttle blip signal that can be used with a solenoid to blip even with a carbed engine if you want to.

 

Very low boostlevel, and softest possible shifting of the gearbox, but it works!
Worlds first 7 speed dualclutch transmission miata turbo

 

So freaking cool. We plan to put one in a Mustang behind a K24 with 90 series EFR next year.

 

Wait what?

 

This is the most winning thing I've seen in a long time.

 

ye felt like it should shift faster
mb you just pushing button too slow lol
cvt next?

 

its probably running less than 300whp now, and slow shifting, it will be a lot faster at full tilt

 

Don't want to hijack Harold's thread. We will start a new thread over on mustang6g and explode some heads when the time comes.

Meanwhile yeah I thought the shifts were a bit slow and clunky. Calzada is going to help us where he can. Whatever we come up with tech-wise will be handed over to KMiata for possible future kit.

 

The shifts maybe clunky because his ECU can't reduce the torque proportionally during the shift as the TCU would normally request to the stock BMW ECU. The shift speed may be increased through the software but this will increase the jerky shift even more.

 

No shift times have been tuned. It has literally seen 10min of use it reduces power for too long as it is now and it was also set in "non sport mode"
It's a lot faster and smoother on my friends chevy nova with the same setup but with more refined tuning

 

If you happen to know the answers, I have a few questions.

How fast in milli-seconds can this transmission possibly shift when tuned for it?

Can it shift with no torque reduction at all?

Could it take 500-600 hp and also shift with no torque reduction?

Max RPM this box can handle?

 

If you’ve ever driven a BMW DCT, sport/m-mode is a pretty drastic different. If that’s equivalent to non-sport mode, then the final tune will be pretty incredible.

 

Correct, this is a street car, so it has a "soft" mode.. and a full on, as fast and brutal as it gets mode.. the video shows the slowest i can get it to shift..
its downright brutal when its full on in "sport" mode..

Video of the same controller in a E30 shows that is doesnt need to bee soft and slow like mine. He runs the same ECU i do.

 

A full shift operation takes about 80ms, but a normal throttle reduce/ign cut time would be around 30-40ms. One clutch starts engaging while the other starts releasing so in does not really drop drive to the wheels.
Its a good idea to run either throttle reduce or ign cut(outputs in the controller for both).
People have run 750nm on the stock clutches at lower clutch pressure levels than we do. around 900nm on stock clutches, closer to 1300+ nm on upgraded clutches. The gearsets seem to take pretty much whatever you are able to put into them

 

Ive seen the DCT behind a honda engine with a turbo in a RX8. so it has been done and is probably a really cool setup

 

Thanks. I need to look more into this. I did my auto swap a few years ago and while it's been bomb-proof reliable and probably 10-20ms shift times with no torque reduction, it's only 3 gears and slushbox. A DCT could be in my future. I will be watching how yours turns out when it's all tuned up.

You mentioned it's a good idea to reduce throttle or cut ignition. I'm guessing clutch wear if you don't?

 

Great work! Pleased to see it running

 

Same here. I do want this trans controller.

 

I was honestly pretty OK with the shifting in the Miata video. That's 7 available gears and consistent shifts about as fast as you could realistically expect to do yourself with an H pattern, but with the ability to do it EVERY time.

Then i saw the E30 video. Holy hell. Yusssss.

 

Correct. My old 135i used this exact same box and it was a night and day difference between the two settings.