Stage 2 tune: My SCR, DPF, EGR and Urea delete Journey

[daytonatrbo]

Without a way to directly compare the effects and the quality of the different tunes, we the laymen are left to assume they are basically all the same. So it only makes sense for us to go with the cheapest option, since none of them have anything more than anecdotal success.

[robnitro]

xHP Flashtool - Flash your automatic trans! Official thread

They can change the torque limiters, no auto upshift in M mode, and shift points.

There they have done the 335d but despite having the same engine and trans, they haven't got to the x5 35d yet.

[daytonatrbo]

I assume that some of the delayed shifts and other odd behaviors we perceive are due to this torque management. The torque output of the engine seems to be limited until the transmission fully selects a gear and locks up the TC. I think without that, and the relatively massive, low rpm torque from this engine, we would see a lot more transmission failures due to burnt up TCs and clutches.

I suspect that remapping the engine for more power, and remapping the trans for quicker shifting would result in either a very harsh shift experience, or lots more wear in the transmission.

[bawareca]

Originally Posted by daytonatrbo

I assume that some of the delayed shifts and other odd behaviors we perceive are due to this torque management. The torque output of the engine seems to be limited until the transmission fully selects a gear and locks up the TC. I think without that, and the relatively massive, low rpm torque from this engine, we would see a lot more transmission failures due to burnt up TCs and clutches.

I suspect that remapping the engine for more power, and remapping the trans for quicker shifting would result in either a very harsh shift experience, or lots more wear in the transmission.

Here is how the system works(simplified):
The "gas pedal" map is called "driver's wish". In the DDE, the position of the pedal is converted to a 0-100% value. This value will have some real value meaning that is output torque of the engine (calculated internally by RPM, boost, etc). Then this value is send by the CAN bus and received by the transmission control module along with others. If your "driver wish" is 300(ft/bs for example, although it is calculated in Nm) but the engine is at 3000 rpm and no boost it is making only 150. At this point the TCU (TCU by it's own, not by a command by the DDE) will downshift (if possible) and unlock the TC. Once the RPM go up and boost will start to build. Once the output of the engine reaches DW the transmission will lock the TC and upshift depending on the DW. The transmission behavior is dictated by the engine output, not the other way around.
The transmission acts fine under boost and doesnt really need quicker shifts in my opinion. The problem is when off boost and the strategy to build boost quicker. 4000 RPM on 1st and 2nd gear are not the proper way to build boost.
There are not many documented transmission failures on diesels, but we'll see.

[Stockx5]

Drove about 200 miles yesterday and the exhaust smell has returned with a vengance.

plugged in the vacuum to the exhaust today and sure enough there is lots of hissing at one of the weld spots and lots more right at the turbo flange.

since I did not use the vacuum test when I left the muffler shop I can't tell if these leaks developed over time or if they where never addressed. but I could swear there was no smell for a few days.

It's possible the temperature changes as well as the rigidity of the flex pipe are causing the flange to become dis engaged under different driving conditions as I assume the engine does rock back and forth under load.

the original DPF did have multiple mounting bolts securing it whereas the Buzzken downpipe simply floats.

called the shop and they did say I could bring it back if any leaks develop so I will be taking it in next week.

[Stockx5]

went back to the muffler shop today and they corrected the leak at the weld, but there was no leaking at the turbo flange.

instead there is leaking at the turbo waste gate, lots of black soot can be seen at the actuator.

don't think there is anything to be done besides getting another turbo

the issue is common and is described here.

https://www.youtube.com/watch?v=YANt6OzRucA

so it's gonna stay like that

MPG seems to have stabilized at 25.5MPG AVG

[daytonatrbo]

Mine leaks at the wastegate shaft too.

[captpilly]

Are you running with re-circulation on?

Mine has been deleted and stinks bad when the AC isn't on and when re-circulation isn't running... also take a look at your engine partitions. If those are broken from age, replace them to keep water out and also, for me, it helped create a better seal and I don't get too much stink inside the cabin anymore.

[Stockx5]

Originally Posted by captpilly

Are you running with re-circulation on?

Mine has been deleted and stinks bad when the AC isn't on and when re-circulation isn't running... also take a look at your engine partitions. If those are broken from age, replace them to keep water out and also, for me, it helped create a better seal and I don't get too much stink inside the cabin anymore.

Recirculaton helps thats the only solution. I think I am also missing a heat shield as I see some parts of the shield with holes where possibly a shield attached.

looking at realoem but I can't seem to figure it out. I am refering to the brake line heat shield it might help.

frankly looking at the entire engine there is oil in a lot of different places that could cause the stink as well. I don't think it's particular to this car. I think it comes with diesel cars.

[captpilly]

Yeah - your not special in this case!

I've been trying to "fix" the smell since it was delete (and even before) - time to just get use to it. I don't mind it much, mostly everyone else that is around.