Members Page/Irbens A - VEMS wiki www.vems.hu

MembersPage/IrbensA (2007-03-23 17:53:57)

What we have at the moment is: BMW 325iX with stock M20B25 (inline 6 cyl) engine planned to be turbocharged, but before it the GenBoard v3.x should take its place on the car.

As I am not an electronics expert, any help from others who have successfuly managed to install Genboard on their cars will be appreciated!

As we have a spare engine, while studying / installing Genboard these changes will be made on it and later it will be installed on the car in the place of the stock engine:

larger 440cc injectors (obviously high impedance);
head porting, slight combustion chamber changes;
custom inlet, outlet manifolds;
lighter valve retainers, rods, flywheel etc.;
turbocharger;
ignition: [COPs] from BMW M52 engine

Shopping cart:

1 x Assembled v3.3 controller
- ignition driver: 6+2; (this means 6 power "IGBT" outputs, 6 of which you apparently plan to use; and 2 logic-level - these will be unused)
- Knock and EGT: yes;
- LCD and PS2: yes;
- MAP connection: 250kPa onboard;
- Power Flyback: yes;
- primary_trigger: VR;
- secondary_trigger: Auditrigger;
1 x EC36-harness
1 x EC18-harness
1 x Wideband O2 sensor
- 1 x WBO2 connector with crimped wires
1 x EGT sensor

Received GenBoard some time ago. Finally managed to work on it last weekend.

Firmware is uploaded. First tests have been done outside the car: managed to get MAP and coolant temperature readings. Next step will be installation of genboard inside the car and wirig all the sensors, injectors (still on their way) and COPs. Now searching for POT style TPS.

Ignition outputs

Have ignition option 6+2 and planning to use COPs. (ignch4 and ignch5 are logiclevel, will not be used)

Firing order 1 5 3 6 2 4

cyl1 ignch0 EC36pin35
cyl5 ignch1 EC36pin33
cyl3 ignch2 EC36pin34
cyl6 ignch3 EC36pin36
cyl2 ignch6 EC36pin24
cyl4 ignch7 EC36pin10

While any wiring can be supported via the ign-sequence h[2], this ign mapping wiring is superior, because easy to remember and LEDs look good on table-test:

h[2]=70 60 30 20 10 00 xx xx

While you do the wiring only once, and the crank and cam stays that way forever on that engine anyway.

Trigger configuration

Start by finding a similar and copying here. Do your adjustments that you think suitable (take notes of where you have the info), and ask for review.

Also could somebody give me some information about crank primary trigger configuration(VR) (standard bmw M20 Crank Trigger Wheel 60-2) and mostly about secondary (VR) (cam trigger wheel from bmw M50 with one Teeth).

Any info about trigger configuration in this case would be good. Have read vems manual, more specific info on configuration in my case (using primary and secondary trigger) - would be nice. I`m trying to gather as much info as possible.

so far found info about triggers

You likely want to use 1.1.18 or newer, see GenBoard/UnderDevelopment/FirmwareChanges for config hints

rpm constant=2000
- rpmk[0]=07
- rpmk[1]=D0
tooth_wheel_twidth1=18 # normal tooth width in quarterdegrees. decimal 24 quarterdegree that is 6 degrees (for 60-2 wheel)
tooth_wheel_twidth1=48 # missing tooth width in quarterdegrees.decimal 72 quarterdegree, that is 18 degrees (for 60-2 wheel)
reset_engphase_after=40 # decimal 64 with camsync
- OR, reset_engphase_after=A0 # decimal 160 when NO camsync
ign_tdcdelay=78 # 60 degrees, adjust base timing
trigger_tooth=00 # adjust base timing
h[1]=64 50 3C 28 14 00 .. .. # 60-2, 6 cyl with camsync (tooth 00,20,40,60,80,100); the last 2 ".." can be anything, like 00 00
h[2]=h[2]=70 60 30 20 10 00 50 50

NEW QUESTIONS about trigger configuration in Megatune (23.03.2007)

Need help again. :( I am using MegaTune 2.25b654 Started to work through configuration and there are questions again :(

To some questions i have found answers in VEMS manuals [1] and [2] but it would be nice if somebody could confirm, that I am thinking in the right direction.

Primary trigger settings (Settings > Primary trigger settings)

Here is a screen shot where you can see about what values I would appreciate help [3]

- Trigger tooth: in first manual "Tooth numbering begins at zero on the first tooth past the missing tooth, in the direction that the toothed wheel is rotating" in second "Number of tooth which triggers an event; missing tooth is number zero, 1st tooth after missing tooth is number 1, etc. First tooth after missing teeth on 60-2 wheel is number 2". Because of that, questions

* The first tooth after missing is 0 or 2 ???

* What value I place here (60-2 standard bmw m20 trigger wheel). Is this value like "TDC after the trigger" only as number of tooth or is it just 0 ???

- Next trigger tooth: that i have found and understand, this value must be 20 in my case, correct ???

- Tooth Relation normal: ???

- Tooth Relation missing: ???

Secondary trigger settings (Settings > Secondary trigger / cam sync settings)

Practically no info in any manual on that :( (I could not find much).

Screen[4]

- First value "TODO! should be 0x02 when disabled!: what is this, what value do I place here (secondary trigger is with 1 tooth from bmw M50)???

- Edge while cranking: Also a misery to me... ???

- Filtering: As I understand "Disabled", correct ???

- Type: "Coil-type"???

- Use: ???

- Rising edge: ???

- Falling edge: ???

THANK YOU ALL FOR A HELP IN ADVANCE!!!

Links to similar engines