2.0TDI BKD BV43a

kirkovskiy

Member
Joined
Nov 23, 2022
Location
Sevastopol
TDI
CFFB, BMR
Hello everyone, I had a BMR Siemens 170HP Passat B6 engine converted to Bosch injectors with EDC16U34. I drove a lot to the GT1749VC 170hp turbine, changed the cylinder head since there were cracks and antifreeze went into the engine, together with the cylinder head I bought a BV43a from the CBBB motor, redid the nozzle and everything became plug & play, but faced the problem of overboost, above the readings of the MAP sensor, above 2bar excess at full throttle, while tearing off the nozzle running from the intercooler to the throttle. I changed the tandem pump, a new nozzle, adjusted the turbine (0.7 v in the lower position and 3.6 v in the upper position), the firmware is adjusted for proper control of the turbine, but at the same time I still encounter overboost.
 

kirkovskiy

Member
Joined
Nov 23, 2022
Location
Sevastopol
TDI
CFFB, BMR
Will no one help? I was already tired, I took off and sorted out the turbine and still have a problem with the boost, I noticed that it behaves incomprehensibly, it happens that it perfectly corresponds to the specified boost pressure, and it happens that it is shifted in normal mode by 200-300mbar
 

adamss24

Veteran Member
Joined
Nov 2, 2005
Location
Great Britain
TDI
audi a4 2.5 tdi 98 quatrro 6speed
Did you adapt the new turbo to the car ? Bv43 has a actuator with a position sensor, maybe that is not working properly and it needs adaptation…
 

kirkovskiy

Member
Joined
Nov 23, 2022
Location
Sevastopol
TDI
CFFB, BMR
the position sensor is not used in the same way as on the GT1749VC turbine, in fact it is just a vacuum actuator, it does not need to be adapted. from the adjustment, I only adjusted the voltage of the stem, but there was an overboost, I had to shorten the stem as much as possible, but the shift remained a little in full load mode.
 

Garrison

Veteran Member
Joined
May 7, 2017
Location
Charlotte
TDI
Stg 3 - 2011 JSW
There's usually some trial and error while adjusting the two nuts (VW even sells a tool kit to do this job) - keep your computer out and connected while you do it, and periodically check the readings as you're working. If the voltage is going in the wrong direction, reverse your adjustments and go the other way. There's a window in which it will operate without issue, so adjust the nuts until you get the voltage within that range, confirm it with a quick drive, and then locktight (or other threadlocker) the nuts in place so they stay.
 
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