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Author Topic: 1.8t: electronic SUV via N249 output  (Read 47541 times)
golfputtputt
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« Reply #90 on: May 23, 2017, 06:57:52 AM »

Ok, small update. Thought this thread was archived, not moved here...

Attached is an image of where my eDV is located. In stock location where it would be in OEM format. After turbo, before cooler. I am currently running it VTA with GFB DV+ stack thingy which is working perfectly under 99% of driving conditions. Attached also is the disassembled document of the DV function block in the FR as posted before.

Keep in mind, that the GFB DV+ works to vent pressure when there is some, it's function requires there to be, so if a signal to the eDV solenoid says 'turn on' but there is no pressure in the charge pipe, the DV will not open and vent. If you are not using the GFB DV+ it most likely won't matter because the tuning here is pretty sound. Signal commands that it opens when it should and does not fail to open when there is pressure needing to be vented. I have not found much if any audible compressor surge using an oem K03.

I have changed two maps, one of which needs to be tweaked. THLDUVD and KFSDLDSUA. I've messed with GWPLDU alot with no drastic change in operating function which is good. USUALLY, when driving, if you lift off throttle until closed (as if to shift) you want the DV open. Under all other driving conditions, you would want it closed, to build pressure (ignoring the special function of B_ldsuas which can be addressed later as a nicety, but i won't be doing it because im VTA with Maf upstream).

Issue that I'm having (I will post a log later) is with PT tuning. If you commence accelerating at WOT, then lift off throttle hard and catch it at half throttle, the turbo will still be producing boost (about 4.5ish psi on oem k03 or K04) but throttle lift will trigger B_ldsuad to become true and DV will open, blasting 5 psi either into atmo. (my setup) or bypass it back into turbo mouth. This will cause a soft code as I have intermittently.

I theorize that you can use the boost error based variable function of B_ldsuad to keep DV closed under these hard, part throttle lift conditions but I'm  still attempting to look for patterns and smooth out all the units of measurement in all these things (log is in mbar, map is in hpa, boost gauge and my brain works in psi). I'm trying to search through my log to calculate the: delta boost error*PIDLDSUA+current boost error so I can compare it to the oem KFSDLDSUA map. If I see a pattern, I may be able to tune it to keep the DV closed when I want it to.

But, I rarely see this condition occur and when it does, it's usually under race conditions, track day, autox etc. I would like the code gone though....
TL;DR: the eDV will work very well with VERY minimal tuning changes to n249 signal protocol (THLDUVD and KFSDLDSUA) but there is one anomaly that I have yet to figure out. It's nice not having all that pneumatic based STUFF clogging up your engine function.
« Last Edit: May 23, 2017, 07:02:34 AM by golfputtputt » Logged
golfputtputt
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« Reply #91 on: June 04, 2017, 07:03:24 PM »

sorry for delay. Here is the log that displays the anomaly. At the very end, you can see the turbo is making 5 psi still after the harsh drop and catch in accel ped percentage. During this time, because of the drop, B_Ldsua turns on and opens the DV and vents.

My desire is, for B_ldsua to continue to open the DV when I lift off throttle to part throttle but not keep it open. Like a quick burst to keep the turbo safe, just enough so I don't loose spool.
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Cookiez
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« Reply #92 on: August 09, 2017, 12:57:02 AM »

I'm having trouble locating the functions i need to alter, anyone know the locations for a 32HN 0001 ecu?
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golfputtputt
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« Reply #93 on: February 06, 2018, 09:20:42 AM »

Update to this:

I took apart my engine, re-bored to 1.9L and installed a GT2860RS turbo.

Now the eDV no longer works properly. I have not changed any variables in the software relating to the eDV when I reinstalled the motor. I'll post some logs a little later but everything that I'm seeing within points to the eDV firing at the proper time and when I ask it to (essentially only on pedal lift) but I'm still getting poor results with DTCs of P1297 and P1200.

At first I thought perhaps the eDV is opening when it should not (due to a pressure differential map in B_LDSUA turning B_LDSUAD to true) but B_LDSUA seems to be false whenever boost is building. (as it should)

I did a cabin test to see if the valve is indeed opening, it is. With the valve unplugged i see a power line voltage of 8v and a firing voltage of 14 (0v and 14v when valve is plugged in) so I assume this is just a floating, unloaded voltage. I need to perform further confirmations to ensure that I did not fry my ECU n249 circuit. Figured I'd plug in my spare ECU and see if it operates properly.

With the eDV in, it bucks and ultimately falls into a 5% WGDC limited limp mode.

I've tried every revision eDV vw makes including GFB DV+. All of which result in this state. Installing the pneumatic DV solves all these issues so that definitely confirms the eDV is to blame.
I will have to look into this further at another time. The fact it used to work is inspiring, just gotta get it back to that state.

Oh, also I have reverted to using this in recirculation mode.
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