I got an Audi TT 2007 VR6 8J (PQ35) running on EcuMaster Black and DQ250.

The car is still being built. I want to go around 800nm.

While reading the forum I found out about CAN-BUS limitations on PQ35:

What I don't understand is whether it applies to my case (EcuMaster Black instead of ME7.1) or not?

In EcuMaster settings there is a setting called "VAG MDI torque". I found this explanation on EcuMaster's forum:

So here it says EcuMaster sends a percentage of torque, not an absolute number. Thus, a CAN-BUS limit of 630nm should not apply in my case?

Here's my guess how things might work:

• You set max torque to 800nm in the DQ250 tune
• You set VAG MDI torque to 800nm in EcuMaster
• When you're driving full-throttle at 800nm, EcuMaster sends "100%" to DQ250, it applies pressure required for 800nm
• When you're driving part-throttle at 400nm, EcuMaster sends "50%" to DQ250, it applies pressure required for 400nm

Is my understanding correct or not?

Thank you for your answer.

I currently have a TVS Stage2+ tune which has max torque at 500nm. My engine is gonna be tuned by an experienced EcuMaster engine tuner but since he specialises on Japanese cars, he's never set up a car with a DSG. So I'm researching the way Ecumaster talks to DQ250 and what needs to be done. Do I need to set VAG MDI torque to 500nm (current max torque in the TCU)?

DQ250 will shit itself at 630Nm

I'm doing upgrades in stages, first goal is 500nm, ultimate goal is 800nm.

I got reinforced DQ250 gears from Monster Performance capable of 1000whp (multiple cars doing that), I'm not worried about the hardware.

He sold me EcuMaster for my engine, says he doesn't tune DSG cars.

Thank you for the explanation. I also found some "5120 hack but for dsg" which I assume is patching DQ250 code which actually allows 750nm+ (like TVS Stage 4 tune). Are there people on this forum that can do it for money?

I may say - do what you planed and share outcome. Points to look:

Hardware:

Clutch basket - it snaps input shaft from flywheel side - it was mentioned in trail already
Input shafts inside gearbox also teds to bend/twist - rare case but seen happen in drag followed by broken in half
Gears itself - it brakes tooths and burns synchro, even main pair seen broken tooths
Differential - better replace with something more solid - as in stock main axis for satellites tend play up eating material in differential bell with drama followed

Software:

Can it deal with 500nm - yes it can without ASW mods messing up with microslip and suffering bit chaos with improper torque/pressures management. Not ideal but possible.
Patching it - variuos options mentioned in trail. If you investigate bit more you may meet few opensource patches for DQ TQ management for personal use only.
Just buy solution - there no ideal ones - there always will be cons/pross.
External controller also can be option. There quite few in market.

Keep going!



 

I am sure the gearbox software will hold 750nm. But the gearbox will never see more than 630nm and the clutch torque will never be over 655Nm in the gearbox.
Try to actually read what is written...

Stage 4 is for an upgraded clutch pack, not for stock clutch. So you can just decalibrate everything where when gearbox sees 600nm and it is actually 800nm for example, and the clutch pressure can be decalibrated by faking the clutch coarseness constant.
It won't shift the best that way, but it's possible to do. And 99.99% that's exactly how it's done.
You certainly won't be able to do it yourself, but you can pay TVS for the software and clutch upgrade.

Btw the price for that software, clutch and/or calibration is probably higher than buying a used DQ500 and killing immo on it (if you get one that even has immo).
And the only thing the DQ500 needs is a torque limiter increase to hold 800nm. Zero hardware changes and zero chance of shitting itself.

Clutch torque is calculated from clutch coarseness constant and clutch pressure, and that's limited to 500 Nm without a patch (or skewing adaptations, which makes it drive bad). So underreporting it will give you nothing, the gearbox will calculate it exactly the same way as before. The software you have now won't magically do 800Nm.
I have open software on my site (and patch) that will do 600Nm on the standard clutchpacks, but 800Nm is just unreasonable on a DQ250.

You're not tuning anything. You have no knowledge whatsoever of any tuning process. But you have very strong (completely wrong) opinions about subjects that you do not understand.

Going over 630 is retarded on a DQ250.  That's assuming you are not a dynojet 630, but a proper European loaded 630.  The gearbox will break.  I've been there, done it lots of times and the customer has picked up the bill for my wasted time and cleaning the oil from the dyno.  Sure you might get a few pulls out of it, but it won't be any kind of reliable.  Just buy a DQ500. 

I was not talking about a stock software in that example but rather a custom software written by a professional tuner. In such a case, my logic was correct?

I'm not gonna tune it myself. As I said, I'm collecting information so that I can ask potential tuners some questions and weed out unprofessional ones. For example, one tuner has already told me he'll simply increase max torque to 800nm and it will work, heh. If it wasn't for this forum, I'd have believed him.