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 :D

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 :D

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 :cool:

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.

That E30 though :party:

Nice work Harald; impressive to see it working, but I guess that's what doing things properly gets you. Eager to see that in "fast" mode.

P.S. Got any more details on that E30?

That e30 has 840awhp and runs a stock dct with upgraded clutches:)

I did a little test with higher boost and quicker gear changes yesterday.
I didnt have to room to stay in it for several gears ør high rpm but it's fast.. 1.9 bar boost.

2nd to 5th gear

Awesome

Looks awsome congrats!!! Is there anyway i could buy or have made a controller for the dct gearbox like yours?
Thanks.

https://www.eliseracing.com/syvecs-h-pro-dct-gearbox

Maxx ECU will have a standalone DCT ECU soon. This one is designed to PnP into a BMW BMW E90/E92 DCT

Maxx ECU also has an ECU that will control the K24 now. Our project will get a Maxx ECU. Cost more than Harald's system but easier.

That's awesome! I'm running a maxxecu race right now... So if I ever decide to go K24 (which I really want to), this is a nice incentive.

A local bike shop that I work with uses the MAXX ECU on Busa's. We are planning a build for a 750whp EFR Busa build this winter using one. I am hoping to get one into my personal miata either in the winter or spring. It looks like a fun ECU to play with an has some decent features built out of the box that make it cost competitive.

Jesus man, that's fast. Really fucking fast. Can't wait for some good daytime videos, great work!

These gearboxes will get stuffed into a lot of cars very soon. a PNP solution is much easier, but when i started this there was really no options for me. And the M4 gearbox is still not controlled by maxx.
I am thinking of upgrading my cars ECU, but i will probably wait until there is a well proven solution that also controls my M4 DCT :)
We have several gearboxes now and plan on running these in rx7s, and cosmos as well.

For a k24 with high revs the m3 gearbox will be really nice.

Also.. my friend with a turbo LS chevy nova has been running his DCT box with stock clutches and around 700 whp for a couple of months now with no issues even launching with 325 wide R888s. so they should be plenty strong for our small cars :D

What about speed signal? Does the DCT box have a sensor or from where do you get a speed signal?

No speed signal from the transmission as the newer bmws use the abs sensors.
My car has never had ABS, but i have retrofitted a couple of hall effect sensors for wheelspeed (senses the wheelbolts passing by) and i will be running that signal from the rear into a dakota digital unit that translates and calibrates the signal to a signal a NB cluster can use, i then will install a NB cluster with custom gauge faces etc in my car to get everything working, and get a 300kph speedo and 9k rpm tacho i want

Not too difficult to put a hall sensor or input yoke of diff. Simple square wave signal. Converting tone ring signal into required format for ECU can be more difficult.

The V8 miata guys use a dakota digital unit that can translate my existing speed signal to something the NB cluster can understand.
https://www.dakotadigital.com/index....=287&mode=prod

i already have 2 hall effect sensors going to my ecu for tractioncontrol.

Great to see,

Ive now started on my build now. Ive been using the RX7 gearbox on my K20 turbo RX7 but the gearbox syncros always take a smashing.
MAXXECU and M3 DCT box going on mine next.
Look forward to playing with it. 1 worry is the width of the box. not allot of room for an exhaust now.
My exhaust fits down the other side of the trans tunnel... ohh well might be a bonnet exit next haha.


Keep up the good work

width and height is an issue if putting it in a mx5 chassis. you will need to widen the tunnel to fit a exhaust past the transmission, and probably raise the engine a little bit. but its a freakin cool swap when its done :D

A friend of mine is swapping a DCT onto a 4Liter jaguar inline 6, supercharged and turbocharged and north of 1000whp. in a old opel blitz truck that weighs about the same as 3.5 mx5s and its still within the limits of the gearbox according to those that have tested big power :D

https://cimg7.ibsrv.net/gimg/www.mia...b78b806259.jpg

Holy moly. My m3 is DCT and this is a fucking win. Impressive fab work and a hell of an idea.

If parts were made available for sale, would there be any interest? i can make and supply 7075t6 billet flywheel adapter with ss2541 Splined adapter for DCT transmissions. Will bolt on to a miata 1.8 flywheel and mate to a DCT perfectly.
Engine mounts to raise the engine the correct amount could also be made, and probably the trans mount. custom driveshaft can be made but shipping would be expensive from norway.
A kmiata 6speed e46 bmw trans plate would have to be sourced in the US(no point in shipping it back and forth).

I would be interested if parts of a kit would be available separately.
I live in Turkey and shipping + customs is a major ordeal for me.
I can source the transmission and make the adapter plate and the driveshaft. What's difficult is the sexy bits - controller, paddle assembly, etc.

BTW, I am following your project very closely.
If there was a way to combine our systems, the end result would be nothing short of fantastic.

Im very interested in this! When do you think you can start making them?

There would likely be a market for this kind of product, but understand that it's niche product on top of a niche product, so the market would be somewhat limited. As a result, the pricing would need to be kind of high to make it worthwhile to produce and sell, which would further limit the market.

That being said, I think this would be BADASS to have on my Miata!

I would definitely be interested in this.

If parts were made available, you sir would truly be a scholar and a gentleman. I think this is tremendous and for those of us that are capable enough and resourceful this would be a great option to have available with your tried and true custom parts !

Would you be willing to measure the distance from the crank/input shaft centerline to the bottom of the pan? Would the m4 trans be drastically different than the 335 trans?

I've got bad thoughts of using one of these behind the LS in my Miata. Engine can't move though. Also the trans controller is a big stumbling block, not gonna spend $2k willingly on the ECM. Anyone been able to get the stock TCU to work? I can send some can data from the megasquirt but not sure it'll be enough for the TCU to function.

Or just tell me your ECM will cost less than $1k and I'll throw money at you.

Bronson. i can check that distance, i have a few of these transmissions now :D
BUT.. i needed to raise the stock miata engine 15mm to make the trans pan flush with the frame rails..
People have been using a few very expensive Syvecs ECU's and maxx ecu.. but even the highend driftworks buildt E30 with a V10 and DCT running syvecs are now so tired of not beeing able to get consistent results out of running the stock BMW TCU.. that they are also converting their trans to a standalone controller.. The bmw TCU combined with a aftermarket ECU controlling it, is just not a stable setup. it sometimes just does whatever it feels like.

I do not make the transmission controller in my car. mine is from the swedes behind DKGECU..

Thanks for the input, you were a little vague about which ECM you were running or I'm just bad at reading so thank you for sharing, I'll look into those guys and see what I'm up against. Those shift times are intoxicating.

not only the shift times are cool.. but we are running this trans with stock clutches on a 750whp ls turbo chevy nova on 335 wide r888 tires, and it holds up fine :D its a stronger transmission than any miata can ever need :D

Agreed on all accounts, I'm only making 400 whp or so. The gear splits are very nice too. Sucks not rowing your own gears but this could be worth quite a bit of time on the average road course

it feels kinda cool just staying in the throttle, feeling a endless push of power, no turbolag between gears. feels like my ducati panigale with a quickshifter :D and with the right diff ratio it will have a nice cruising speed, and tighter ratios than my 6 speed did

Hi!! Wanted to know if you could give or sell the CAD file of the splined adapter or just the spline im making a adapter for a diferent engine and you would save me a huge amount of time please pm me of you can help me out thanks!

I love this project. Do you know how much this trans weighs?

I won't testify to it, but IIRC from when I had my 135, the trans is in the 175-180 lb area.

That seems crazy heavy. It doesn't look any larger than the ZF 6-speed we use, which only weighs 96 lbs. I'm sure it's heavier but I'd like to weigh one.

Trans weighed 80kg including 8?! Liters of oil.. Keep in mind that that also includes the clutches capable of handling 700ft/lb
But yeah its a heavy bastard. i weighed a 6 speed manual diesel trans at 55kg, and the miata 6 speed at 35kg. So it adds weight to the car, but it more than makes up for it with short gear ratios and fast shifting. And the weight is placed down low and in the middle of the car.

2 clutch packs, solenoids, sensors, mechatronic unit, pump, all these add to the weight. The DSG on a VAG car is about 25kg heavier than a manual.

You all need to get together and have a k-swapped DCT love child MX5
.

Well done Harold! While I appreciate your vision and resourcefulness in making at all work it’s the fabrication quality that’s got me the most impressed. I’ve spent a lot of time around fabricators over the years and while most “got the job done” there were a rare few that had the great vision to make it a work of art as well. I’d put you in the later bucket. Mad props!!!

It’s pretty funny to find thread this thread while searching for a way to fit a BMW Samsonas transmission to my Miata. While possible I just don’t have the skills or the appetite to pull it off like you did. If I had your skills I’d be putting the BMW engine in there too! Dry sump S65 4.4 stroker engine. 600hp 😳 It’s all from a BMW E36 track car I am looking to part out.


https://cimg3.ibsrv.net/gimg/www.mia...666eb44f1.jpeg

Thanks for the kind words :)
The samsonas box should be epic, just install a different bellhousing on it as the V8 bellhousing is quite big. if you can get a bellhousing for a e46 6slinder car it should bolt up fine :)

Hi Harold, I’m in the same boat as Bronson. I also have a V8 Miata with a T56 gearbox that I want to get rid of so badly I can’t stand it. Did you ever happen to get that measurement on the centerline to the bottom of the transmission so we can see if this would work in a V-8 swap Miata?

thanks in advance
Chris