xHP Flashtool - 6HP21/28 TCU cracked
- Thread starter doublespaces
- Start date
What TQ are we talking about? It seems there is some decent leftover on the 6HP21, but as this evolved out of the Diesel sector, I haven't investigated too much until now. The common Diesel trans is the 6HP26/28 and holds 700 Nm (or approx. 500 lb.ft.) easily. The gasoline ones are weaker. What I can say from map comparison, is that the Alpina trans maps end at 540 Nm(or 400 lb.ft.), where as the diesel maps stretch to 500 lb.ft. So this is the area, where OEMs decided to control the clutches. Anyhting above, is treated as "out of control". Not necessarily bad, but at least they decided to not handle this TQ in the stock maps.
So is it possible to extend those maps out? And would this solve any problems like post shift timing drops?
Yes, that's no problem. Probably upping the torque limiters alone will cure some problems. AFAIK some guys trick the TCU with fake torque values from the ECU to stay under this limiters. This alone is a problem and we have to see how the transmissions behave with correct TQ signals.
Yes, I think that things will get much better once those values are actually correct. I hope.
Has to, but that's the cost of going fast sometimes... I've heard tuners blame TCU flashes for "letting the motor spin to fast" and that caused the motor failure... Almost wish I had a 6AT now... Still glad I got the 6MT tho
Has to, but that's the cost of going fast sometimes... I've heard tuners blame TCU flashes for "letting the motor spin to fast" and that caused the motor failure... Almost wish I had a 6AT now... Still glad I got the 6MT tho
Reliability is not straightforward regarding transmission tunes. If you're running a lot of boost and the transmission starts to slip while engaged, which probably can be cured by a tune the opposite happens. A tune increases reliabilty, rather then decreasing it.
In general it's not always "tuning" in terms of going more aggressive. A lot of things can be tweaked to how the driver prefers them to be, but have nothing to do with reliability. Think about shift points. Some want shifts as early as possible, others want the opposite. Nothing good or bad about that, it's just personal liking. Or TCC slip. The stock calibration lets the transmission slip a lot with modulated TCC pressure. Personally i hate slip, so I configured the TCC to stay closed as long as possible. Less slip equals less wear in that case. On the other side, if someone wants the fastest shifts possible and likes torque punches on each shift (like a lot of the DCT transmissions do it in Sport Mode) it will of course wear out the clutch packs in the long run. All I can say is, that no OTS map we will be delivering will test the limits. We will do our best, to deliver safe and reliable tunes for everyday use.
I have lot's of BMW files and various Alpina calibrations here and investigated them thouroughly. Additionally my own car will have a few 1000 miles with the tune on it, when we will release in February. And of course, my car is the main development bitch, which has probably 100+ full throttle launches on it right now.
So you are the friend who knows the friend! We owe you!Thanks Richard, I'm glad that I was able to help by asking Dave to join the team!
