Transmission slipping? Maybe some other weird thing?

[razorlab]

What risk is there to a running a high gear/low RPM/high boost situation?

LSPI can be a real SOB.

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[underdonk]

LSPI can be a real SOB.

I thought those were the speed chatters! I understand the principle, but is that really a concern with the B58? I've lugged the engine in the car plenty of times before because I'm a shitty driver and never had (audible) issues with this. Certainly nothing dramatic enough to throw a code, which I imagine the electronics in this car would do if there was something potentially damaging occurring. Note I'm not trying to be argumentative, just trying to learn. I've built plenty of NA motors for track work before, but only one other turbo motor, and it did not have this issue.

 

[razorlab]

I thought those were the speed chatters! I understand the principle, but is that really a concern with the B58? I've lugged the engine in the car plenty of times before because I'm a shitty driver and never had (audible) issues with this. Certainly nothing dramatic enough to throw a code, which I imagine the electronics in this car would do if there was something potentially damaging occurring. Note I'm not trying to be argumentative, just trying to learn. I've built plenty of NA motors for track work before, but only one other turbo motor, and it did not have this issue.

It can become more of an issue after tuning when people only tune for WOT or when they just up the torque/load request curve from stock and suddenly the car is requesting 700 Nm at 2,000 rpm.

The Supra ECU has some great logic to help prevent it as much as possible.

My VW's on the other hand....

 

[underdonk]

It can become more of an issue after tuning when people only tune for WOT or when they just up the torque/load request curve from stock and suddenly the car is requesting 700 Nm at 2,000 rpm.

The Supra ECU has some great logic to help prevent it as much as possible.

My VW's on the other hand....

Funny you mention it, the other motor I didn't have any issue with this in was a 1.8T VW motor. Maybe I just got lucky, but it was built for track use, and it seemed like (upgraded) electronics and quality lubrication did a good enough job addressing it that I wasn't able to blow it up as much as I tried.

 

[razorlab]

Funny you mention it, the other motor I didn't have any issue with this in was a 1.8T VW motor. Maybe I just got lucky, but it was built for track use, and it seemed like (upgraded) electronics and quality lubrication did a good enough job addressing it that I wasn't able to blow it up as much as I tried.

Right, but are you going WOT in 5th at 20mph?

 

[underdonk]

Right, but are you going WOT in 5th at 20mph?

Not on purpose.

 

[BLACK SHARK]

여보세요. 방금 MHD에서 커스텀 튜닝을 마쳤습니다. Pure 800, E40, Meth, Xhp 튠 등
부스트를 구축하는 동안 약 3k rpm에서 6단에 바닥을 쳤을 때 차를 처음 운전할 때 tranny는 짧은 중립 회전수(미끄러지는 것과 같은)에 들어가 약 30초 동안 잠들었습니다. 잠자라고 하면 패들 변속을 할 때 화면의 수동 기어가 위아래로 움직이는 것을 볼 수 있었지만 tranny 쪽에서는 아무 일도 일어나지 않았습니다. 그것은 단지 같은 기어에 머물렀다. D로 전환하고 약 20-30초 후에 원래 있어야 할 스포츠 장비로 돌아갔습니다. 6층에서 바닥을 쳤을 때 이것을 다시 복제할 수 있었습니다. 이런 일 없이 3-4-5에서 바닥을 칠 수 있습니다. WOT에서 5-6에서 이동했지만 발생하지 않았습니다.
코드를 스캔했고 DME에서 이 코드를 얻었습니다. 전송 중인 코드는 없습니다.

10D000 - 연소 엔진: 토크 제한이 활성화되었습니다.

나는 608whp와 597tq로 매우 보수적으로 조정하고 있습니다.
이것에 대한 모든 빛은 정말 감사하겠습니다. TIA
[/인용하다]

 

[tanabersx]

Just for an update my car started with this exact slipping in 6th. Now is CLEARLY slipping no doubt about it. Tranny is going to Pure next week for stage 1, just figuring out how to freight ship it to them.

 

[kfer]

Hello. I just got my custom tune done on MHD. Pure 800, E40, Meth, Xhp tune etc.
First drive of the car when I floor it in 6th @ around 3k rpm while building boost, The tranny went into a short neutral rev(like slipping) and went to sleep for about 30 seconds. When I say sleep, I could see the manual gears on the screen moving up and down when I paddle shifted but nothing was happening on the tranny side. It just stayed in the same gear. Switched to D and after about 20-30 seconds It went back into the sport gear it was supposed to be in. Was able to replicate this again when flooring in 6th. I could floor it in 3-4-5 without this happening. Even shifted from 5-6 at WOT and did not happen.
I scanned for codes and get this code on DME, no codes on transmission.

10D000 - combustion engine: torque limitation active.

I’m at a very conservative tune with 608whp and 597tq.
Any light on this will be really appreciated. TIA

I think you are facing the same problem as me.
The fault code you mentioned comes from the TCU and is a sign of "slipping". But there is another way to analyze the problem. You use MHD, so you can also log. There are 2 important things in this log. The first is the "Torque Limiter Status" - which will show you 1048576 what the limit means.
The other is "torque at the clutch". I think at the point where your transmission starts to fool you, the torque is too low and the above code shows up.
I'm trying to explain what I learned from the xHP guys. The transmission prepares the line pressure for the requested torque (this torque is the value that the DME transmits to the TCU, so the value you see in your log). Since the gearbox (without xHP) has a limit of approx. 550Nm, the MHD tuning (and I guess the others too) does a big trick. It sends lower values than the actual value (around 500Nm in a Stage 2 tune) and so the DME is happy and we hope the gearbox can handle the torque even with lower line pressure. The goal of the xHP would be to eliminate these limitations from the transmission, but having the DME send the downscaled torque readings has no effect. So the slip is there because the gearbox is making line pressure for 500Nm, but you're pushing it at 800Nm. The solution would be to ask your custom tuner to correct the torque readings.
Another alternative could be a Custom Tune from xHP, where they increase the pressure values (e.g. at 500Nm apply a pressure that belongs to 800Nm).

As you can see in my screenshot, before it happens the RPM starts to increase faster (sign of slip) and then the limit kicks in.
At this point I have torque in the 650-700Nm range but DME has only reported 450Nm. When the value was increased to 600Nm the problem went away.

 

[tanabersx]

Thanks for that thorough explaination. Currently on the break in process for stage 2 Pure. Lets see how it handles. Thanks!

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