Zero to 60 converting to DCT

[aus335iguy]

I was hoping they would drop in a dct

So apparently they need someone in Australia that can convert the car to MSD81.

 

[NoGuru]

Yeah I saw that yesterday. I was really thinking the ZF8HP70 would be the better route but both are good options.

 

[Torgus]

Interesting choice as it is like 5k in parts to upgrade the DCT...after buying the used DCT and paying a qualified shop to swap in the parts it has got to be almost 10k I would think all said and done.

 

[SLOWESTN54]

I'd assume they will be doing the swap themselves. Also, if you bought a parts car couldn't you hopefully just pull things out of one car put it in the other, do all necessary coding and send it?

 

[Torgus]

I'd assume they will be doing the swap themselves. Also, if you bought a parts car couldn't you hopefully just pull things out of one car put it in the other, do all necessary coding and send it?

I assume that as well.

But can they build the DCT when the time comes? I assumed you needed to send it to a shop? Either way I still say around 8-10k everything included:

5k upgraded DCT parts from SSP
2k for the donor car
Cost to install upgraded DCT parts? 1k in tools if you DIY.
MSD81 upgrade $600
Fluids $500
DCT flash tune $750

I believe I have read that the stock DCT gives up the ghost around 600 ft lbs of tq. Which he should be able to make with a single turbo easily.

 

[RuskiRacer]

The stock dcts can take around 600 ftlbs give or take depending on the fluid being used and the size of the transmission pan along with if your using any additional transmission coolers. Dcts run pretty hot from when I've rode and drove cars hard with them

 

[Torgus]

The stock dcts can take around 600 ftlbs give or take depending on the fluid being used and the size of the transmission pan along with if your using any additional transmission coolers. Dcts run pretty hot from when I've rode and drove cars hard with them

https://www.sspperformance.com/bmw-dct-heavy-duty-transmission-cooling-package.html a steal at 2k

The DCT is bad ass but expensive to fully upgrade. For an automatic I think the Guru 6HP26/28 upgrade might be the most economical choice.

It is interesting the title of the video is 'best trans for high HP' because the only thing proven is the manual by far.

 

[SLOWESTN54]

I assume that as well.

But can they build the DCT when the time comes? I assumed you needed to send it to a shop? Either way I still say around 8-10k everything included:

5k upgraded DCT parts from SSP
2k for the donor car
Cost to install upgraded DCT parts? 1k in tools if you DIY.
MSD81 upgrade $600
Fluids $500
DCT flash tune $750

I believe I have read that the stock DCT gives up the ghost around 600 ft lbs of tq. Which he should be able to make with a single turbo easily.

Ahh now i see. I think their plan was to simply just use XHP to turn up the line pressures and hopefully keep the clutches from slipping. I highly doubt their going to build the DCT.

https://www.sspperformance.com/bmw-dct-heavy-duty-transmission-cooling-package.html a steal at 2k

The DCT is bad ass but expensive to fully upgrade. For an automatic I think the Guru 6HP26/28 upgrade might be the most economical choice.

It is interesting the title of the video is 'best trans for high HP' because the only thing proven is the manual by far.

Can speak from experience the 6HP26 can take some abuse for sure

 

[RuskiRacer]

https://www.sspperformance.com/bmw-dct-heavy-duty-transmission-cooling-package.html a steal at 2k

The DCT is bad ass but expensive to fully upgrade. For an automatic I think the Guru 6HP26/28 upgrade might be the most economical choice.

It is interesting the title of the video is 'best trans for high HP' because the only thing proven is the manual by far.

Yes I definitely agree manual will take 800+whp with ease the 26/28 upgrade is what I wish they would have done . May end up doing that for a 135 single turbo customer of mine

 

[Torgus]

Ahh now i see. I think their plan was to simply just use XHP to turn up the line pressures and hopefully keep the clutches from slipping. I highly doubt their going to build the DCT.

Yeah, hopefully the line pressure etc. is enough. He mentioned building the DCT in the video which is why I brought it up. Right around 13 minutes in. Hopefully he can get away with not needing to, it is an expensive endeavor.

I guess it really just depends on how much he abuses the car and what power he is making if the DCT will last..

 

[SLOWESTN54]

Yeah, hopefully the line pressure etc. is enough. He mentioned building the DCT in the video which is why I brought it up. Right around 13 minutes in. Hopefully he can get away with not needing to, it is an expensive endeavor.

I guess it really just depends on how much he abuses the car and what power he is making if the DCT will last..

Sorry i probably missed that. I do remember him talking about wanting to go towards 750whp with a single setup. Maybe if they keep the torque low they'll be fine?

 

[NoGuru]

I have done fluid and filter changes on mine and run xHP stage3 and keep Tq below 600. Never had a slip yet.
Launching sucks with DCT though, you will never be as fast as the others for launching.

 

[Torgus]

I have done fluid and filter changes on mine and run xHP stage3 and keep Tq below 600. Never had a slip yet.
Launching sucks with DCT though, you will never be as fast as the others for launching.

That is one of the reasons I was thinking the Guru 6HP26/28 might be the ideal automatic over the DCT(both are types of automatic transmissions) both for cost and application.

The DCT is probably slightly more useful on the track. But straight line, highway, launching, 1/4 mile, daily driving, I think the 26/28 would win out between the two. Not that the DCT is bad in any way, don't get me wrong.

 

[NoGuru]

That is one of the reasons I was thinking the Guru 6HP26/28 might be the ideal automatic over the DCT(both are types of automatic transmissions) both for cost and application.

The DCT is probably slightly more useful on the track. But straight line, highway, launching, 1/4 mile, daily driving, I think the 26/28 would win out between the two. Not that the DCT is bad in any way, don't get me wrong.

I would agree with this.
If I blow the DCT I would consider switching to the Guru depending on what happens. It hurt my wallet to think about upgraded clutches for the DCT.

 

[aus335iguy]

This is the misconception about the DCT. The same (very similar) box with very similar clutches in an m5 handles the torque just fine. Same for people who’ve put it behind big v8 drag cars running single digit ETs. It also launches just fine. The secret to making it handle the power is actually the engine control unit

A lot of the issues with DCTs in n54s is how it’s tuned and how the DME reports torque. If you delve into the world of tuning(I’m told) not many tuners actually know how to report torque properly on a DCT.
Good example is people stating that you need XHp to up line pressure to 18bar.... apparently this can be done stock with reported torque from the DME. The DME has logic that limits certain things. The DCT software has been cracked now.

Well soon see I suppose.

 

[carabuser]

I watch their videos too, probably my favourite youtube channel. Partly for the N54 content and partly for the aussie backdrop. Even coming into their winter it's blue skies and t-shirt weather where it's been 12C and raining here for entire month so far. They have a pretty solid collection of cars too. I love my N54s but if I had a V10 M5 parked in the garage I'd certainly use them less.

I'm glad to see them going DCT purely for a little variation, they already have a load of slushbox cars sat around.

He does talk about going single turbo but then mentions wanting a fast 0-60 then also mentions he wants a good daily driver. I think those 3 goals are mutually exclusive. They already have that powerglide single turbo car so I don't know why they'd bother with another one trick pony, makes much more sense to turn the car into a fast daily.

 

[SLOWESTN54]

I watch their videos too, probably my favourite youtube channel. Partly for the N54 content and partly for the aussie backdrop. Even coming into their winter it's blue skies and t-shirt weather where it's been 12C and raining here for entire month so far. They have a pretty solid collection of cars too. I love my N54s but if I had a V10 M5 parked in the garage I'd certainly use them less.

I'm glad to see them going DCT purely for a little variation, they already have a load of slushbox cars sat around.

He does talk about going single turbo but then mentions wanting a fast 0-60 then also mentions he wants a good daily driver. I think those 3 goals are mutually exclusive. They already have that powerglide single turbo car so I don't know why they'd bother with another one trick pony, makes much more sense to turn the car into a fast daily.

Their E60 M5 is really the car that deserves a DCT Swap

 

[StevieJ2]

I assume that as well.

But can they build the DCT when the time comes? I assumed you needed to send it to a shop? Either way I still say around 8-10k everything included:

5k upgraded DCT parts from SSP
2k for the donor car
Cost to install upgraded DCT parts? 1k in tools if you DIY.
MSD81 upgrade $600
Fluids $500
DCT flash tune $750

I believe I have read that the stock DCT gives up the ghost around 600 ft lbs of tq. Which he should be able to make with a single turbo easily.

xHP announced a few days ago they're testing a new e8x DCT flash that should hold +/- 1000nm/730ft lbs. 600ft lbs was the cut off with their current tune and 19 bar pressure.

 

[aus335iguy]

xHP announced a few days ago they're testing a new e8x DCT flash that should hold +/- 1000nm/730ft lbs. 600ft lbs was the cut off with their current tune and 19 bar pressure.

With just a software change ... imagine that

 

[aus335iguy]

I hope the zero to 60 guys understand how the JB4 reports torque. Once you glaze clutches there’s no going back.
He’s mentioned in the video that the car is spinning tyres on upshift …but… could it be slipping instead ?