Subpage of MembersPage/Akos/AudiAbz
V8 with 60-2 trigger and 8 COPs (currently ign_dualout)
Originally it was falsely reported
that trigger system is InputTrigger/AudiTrigger with
primary trigger
- 136 tooth (none missing) VR sensor on the crank
secondary trigger
- 1 tooth "crankhome-VR" sensor on the crank
- 1 tooth HALL on the cam, (windowing every other crankhome-VR pulse)
It turned out for sure
there is no crankhome-VR, and the
primary trigger
- 60-2 VR (appr 960 Ohm) VR sensor on the crank
- DID Audi V8 ENGINEs USE 60-2 ? The motronic seemed to run it...
secondary trigger
- 1 tooth HALL on the cam
Unfortunately the ECU was ordered with secondary_trigger=VR that needs VR sectrig to work. Modification so it would work with HALL trigger is possible (see GenBoard/Manual/InputTriggerHardWare), only a solderblob needs to be removed, but disassemble+assemble might take 40 mins.
Likely the 8 ignition coils will originally be driven with ign_dualout, so the 60-2 primary trigger is enough to run the engine.
Base timing
We got the ABZ running with igndualout on 8 (S4 passive) COPs
- trigger_tooth=decimal 13
- TDCdelay=60 degrees
Cyl 1..4 seem to run, cyl5..8 seem not.
Assuming firing order: 1-5-4-8-6-3-7-2 this was VERY supprising. Is the firing order correct ?
- cyl 1..4 is left bank (1 is in front, at the timing end)
- cyl 5..8 is right benk (5 is in front ? 5 is at the timing end ? THIS IS SUSPICIOUS)
Guesses
- maybe the currently set base timing is waaay off. Maybe some cylinders fire 360 degrees off of the intended point.
- Fuel rails are in series, that is cyl 5..8 get slightly lower pressure (should be negligible at idle).
If you have some experience with this engine ? Do you have info on base timing ? trigger_tooth and ign_tdcdelay ? Did you strobe the engine ?