E34 M5T DBW Help needed

EMU BLACK / CLASSIC
1

Assistance required please.

Car is a E34 M5 turbo with a plenum that uses the individual throttles from the S38 engine. Have fitted a dbw as required for the 8hp conversion we just did and i have a CANTcu that will operate the 8hp.

We initially fitted a Bosch 82mm DBW throttle to it, but modified to operate the individual throttles.

It did not have enought torque to open to full throttle. Have changed to a E46 M3 throttle accuator, which works much better. accuator has a short cable connected from it to the throttle linkage and the springs with exception of 1 where removed from the linkage to reduce resistance.

In the software i select the correct accuator in the wizard and then do the calibration and all works and goes through its motions with no errors. once finished it opens to the FULL POSITION and no or very little response from the golf 5 pedal we used. If i use the dc test function it works correctly.

i have inverted polarity in the software, changed the wire polarity, changed tps polarity and the same happens. Tps and PPs values read correct and PPS/analog3 is half value of TPS.

analog5 is to tps on accutator and reads from 0.7 upwards when the accuator moves to full open.

if i invert in software then throttle moves in correct direction but only 2-3mm.

First DBW i am working on with the Emu Black so have attached the map and hope to be pointed in the right direction. appreciate any replies.

MoM5Tbackupdbw.emub (146.6 KB)

2

in the help folder i found this circuit diagram for the BMW itb .

anyone used this circuit ?

am i correct to use 4 x diodes in series ?

e46 m3accuator
e46 m3accuator658×577 72.2 KB

“emu stepper” in diagram i assume to use a output or Hbridge1 ?

thanks

3

Having a hard time to get the listed omnifet.

Alternative i can get is 80amp x 70v.

Listed omnifet is a 35amp x 70v.

Will it work ?

4

Have had a chance to go over the installation and reinstalled/rewired it.

TPS and analog 3 wired to the MK5 golf pedal.

after calibrating the values show correct and analog 3 is half the value of the TPS.

Must the analogue 3 value be opposite polarity/work imversely to the TPS ?

When i swapped the 5v and ground to reverse the polarity on each pedal output, the output voltage doesnt change and stays at ±4.9v. pedal is wired as per VW pinout:

pin1 - 5v

pin2 - 5v

pin 3 - gnd

pin 4 - signal 1

pin 5 - gnd

pin 6 - signal 2

Analogue 5 is on the M3 actuator tps.

Analogue 6 is on the engine throttle body manifold tps.

The voltage on analogue 5&6 was not adding up to 5v.

they work inverted/opposite to each other and when added the voltage is around 6.39v

initially the CEL light was on red and i sorted that out and set in Parameters the max pot error to 1.39v in order for total voltage to add up to 5v.

In DBW calibration, it completes the process but after when i press the pedal i only moves a little bit and gets around 9-10% movement as shown in the DBW target.

In DBW characteristics it shows pedal movement going to 100%.

if i use the movement test in Override then it works fine.

Possibly there is a limiter or something preventing the throttle moving more ???

map attached and a log of the dbw and pedal.

Just completed fitting the 8hp trans and need to take if for a test drive to check all is working.

would appreciate some feedback and assistance.

MoM5Tdbwcantcu.emub (146.6 KB)

dbwlog1.emublog (17.1 KB)