MembersPage/GunnarReynisson/Questions (2019-07-01 12:43:00)

Any known of any succesful setups for a flywheel based Bosch trigger setup.

Such as Porches and early BMW´s.

Most likely two VR sensors

116 + 1 Trigger (divide by 4 or 29 ? 4 cyl prolly)

129 + 1 Trigger (divide by 3 ? 43 would be only 3 pulses / crankrot, maybe good if 6 cyl)

130 + 1 Trigger (divide by 5 or 2 ? 130=5*13*2 so 3 not possible)

132 + 1 Trigger (divide by 3, 6 or 4? 44, 22 for 2 cyl, or 33 teeth for 6 cyl to configure respectively, matching the divider )

  • 132 seems to be the most universal, and most widely used in Porsches (at least from memory; Many installed in Estonia)

- Gunni

- Gunni -

Yes, the starter teeth are trigger teeth for the ecu to know the speed, the one trigger is to located the TCD and then the ecu can know the exact location from the starter teeth.


individual power :

What is the measurement exactly?

I was thinking that whatever it is now it might be improved upon by having it calculate the time it should take from 0-90° (or an adjustable value) only and then report the delta time as crank angles.

This would eliminate variation in a complete cycle due to other cylinders and concentrate solely on the firing cylinder. Then cylinders can be compared and misfires extremely clear and potentially knock could be determinable.

TPS accel enrichment :

The scale in Vemstune is what appears to be millivolts against time, but there is no channel that represents this for measurement only an actual dTPS/dTime, it would be ideal to convert the scales to TPS/Time as if one where to replace the TPS with another the tuning wouldn´t have to be replaced as well as being closer on similar engines with different TPS´s.


Lambda heater duty cycle monitoring.

i have on a few occasions had a situation where lambda isn´t read for quite a long time even if engine has been run up to temperature , 10minutes for instance. Any reason to this? I want to be able to monitor the Heater DC% to determine if the heater is actually on or not. Lambda then usually comes in but takes way to long.

Any update on this??


LSU 4.9 support?

Q: Is there support as Vemstune now suggest that there is ?

A: Currently LSU 4.9 is only supported with hardware modifications to v3, we are developing firmware to allow both LSU 4.2 and LSU 4.9 to be used on the same hardware, without modifications. When making sensor choice for current project, use LSU 4.2 until recommended otherwise.


ECU serial 17347

I ordered a M52 PnP.

This ECU has a black connector and a single board inside.

Is this correct for new M52 PnP ECUs?

I ask because when powered on the bench it doesn´t connect via Vemstune. I was only going to do a quick look at it and upload a base map and now I can´t even connect to it.

I have 12v power to pin 49 which is switched input and to 26 which is constant 12V. Grounds are as per M52 wiring.

Anything else that needs 12v for this to turn on?

There is a wiring fuss inside this ECU from VEMS, I´ll have to send it back.

Pin 49 - Switched 12v and Pin 54 are wired together

Serial communications are intermittent to less than 10% success rate. I´ll be sending it [to ..., check address in shop freshly].


Accel enrichment:

Q: Is the added PW done on a cycle by cycle bases or if the TPSdelta is higher than the required amount to trigger fuel enrichment the PW is updated for the next cylinder injecting?

A: Accel enrichment thresholds are monitored continuously (25msec timebase), the added fuel is indeed applied (first) on the next injection to start (and following) ones.

Fuel injection:

Q: Is the PW updated on a cycle by cycle bases or cylinder to cylinder bases when the ECU calculates updated parameters from inputs and then updates PW for the next cylinder?

A: Each trigger_tooth triggers a full pulsewidth recalculation before start of injection (including TPS acceleration enrichment and all other enrichments calculated from fresh input-data).


Injector trim

The additive is added to the deadtime post all calculations?

The multiplier is against the pre deadtime value?


ECU required for comprehensive M54/E46 support

Please advise if spec is possible

Digital inputs (4 excluding Brake light and Clutch)

Digital - Crank

Digital - CAM I

Digital - CAM II

Digital - VSS

Digital - Brake light switch

Digital - Clutch switch

Analog inputs (Total 12, 14 including Brake light and Clutch)

Coolant temp - pulled up

Air temp - pulled up

Radiator out - pulled up

Oil temp - pulled up

PPS 1 - No pullup

PPS 2 - No pullup

TPS 1 - No pullup

TPS 2 - No pullup

Spare 1 - No pullup

Spare 2 - No pullup

Spare 3 - No pullup

Spare 4 - No pullup

Knock (Total 2)

Channel 1

Channel 2

NFETS/IGBTS/INJFETS ( Total 18 ON/OFF/PWM )

Inj 1-6 (6 total)

ICV (2 total)

DISA (1 total)

Fuel pump relay (1 total)

Main relay (1 total)

Vanos (2 total)

Exhaust flap (1 total)

FAN PWM (1 total)

Thermostat control (1 total) - 1Hz duty cycle ideally put into VEMS with hysteresis and target temp

AC Compressor out (1 total)

DBW - (1 V3 output total into bridgeoutputdriver)

CAN Output no input

Serial 2 to CAN STM32 - spec to follow if not known

Please advise so I can order ASAP.