Porsche 911 Turbo 6 cylinder engine, engine unknown but had the Motronic from the 3.2 engine running before vems install.
The engine is similar to MembersPage/MacB
Update: the car is running on 1.1.98 fw. Good job guys!
For the c129 signal, divby43, 1.1.98 (17-Jan-2012 or newer) firmware needed from [developer testserver]
- See the http://cell.dyndns.ws/f/README.txt how to install this
- (1.1.98 not released to the public yet, but actually seems better than anything before).
- With the 129 tooth, we tested beyond 10000 RPM (on the bench, including ignition and injection outputs).
- The change we did was basically a revert of change that was made to a certain request, but not extensively tested yet
- basically auditrigger behaviour should be now as good as back in 1.1.95 for non-3 divider also
- but with the desired changes - eg. allowing all 3 trigger signals to be connected and scoped independently with v3.
- injector outputs: only injgroup 0, 4 and 5 were used (this might seem unconventional, it's all because the sectrig is not 720 deg but 360 deg),
- so we enabled 2 inj outputs (we paired the outputs that are actually 360 deg opposite) in injgroups 0,4 and 5 (and left injgroup 1,2,3 empty).
- Why not use injgroups 0,1,2, and also set "Number of primary injectors" to "3" instead of "6"?
- also, should "two stroke" or "four stroke" be used in this setting?(latest config is set to two stroke)
- Why not use injgroups 0,1,2, and also set "Number of primary injectors" to "3" instead of "6"?
- so we enabled 2 inj outputs (we paired the outputs that are actually 360 deg opposite) in injgroups 0,4 and 5 (and left injgroup 1,2,3 empty).
Trigger setup:
Flywheel tooth and flywheel pin triggering, flywheel is 129+1.
ECU Info:
ECU#4215 vr/vr trigger(auditrigger non camhall)
Flywheel Tooth Trigger to EC36-27
Flywheel Pin Trigger to EC18-12
Here's link to 911 Workshop Manual, years 1984-1989: http://www.cannell.co.uk/911_72-89_Workshop_Manuals/84-89%20Workshop%20Manual.pdf
Maybe there's some info on 911 Turbo as well.(MembersPage/PeepPaadam)
- [1.1.98 (experimental)] was tested, and found good with this divby 43 config
- http://www.vems.hu/files/KevinBlack/porsche-1.1.98-divby43.zip with config, vemslog, triggerlog
- it seemed good on the bench beyond 10k RPM, but we're retesting it extensively, also analyzing ignition events (count and position), also sweeping sectrig and special care around 3000-5000 RPM
- Here is a [bitscope] file (sectrig, fixed "TDC-position" signal just for scope, 2 ign and 2 inj outputs) 8 bits packed in 1 byte, every 2 usec. (revlimit was 9900 RPM so above that inj and ign would be off).
- WHILE we are continuing analyzing behavior, we are more and more confident that misfire below 6500 RPM would be caused by input trigger, likely crankhome signal polarity, noise or something similar. Extensive onsite inspection needed, triggerlog captured at 115100 and scope will likely be needed.
- 115k Triggerlog is here, scope screen is below
- note: anything after "auditrigger with third trigger input software "camHALL scope" (2011-08-02) will NOT work, so 1.1.96 and 1.1.97 will NOT work (at all with this trigger, see GenBoard/UnderDevelopment/FirmwareChanges ). 1.1.95 should work (we didn't tested it)
- Trigger Edge: Rising
- Trigger Type: Coil Type
- Special Trigger Type: Auditrigger DivbyN
- Audi trigger divider: 43
- Number Of Teeth On Wheel: 3 (NOT 6, because only 3 per sectrig. 3*120=360 as sectrig pulse comes every 360 deg on this engine)
- First Trigger Tooth: 0
- Next Trigger Tooth: 1
- Angular Width Of Tooth: 120
- Filtering and below: Disabled
- reftooth: 0 2 1 0 2 1 x x (because teeth 3,4,5 does NOT exist)
Secondary Trigger:
- Mode: Cam Sync
- Edge: Rising
- Edge While Cranking: Single
- Use: Cam Sync
- scopeshot suggests sectrig is OK
- primtrig pulses == 129 for sure ?
The primtrig has a lower-frequency component (which can cause runout at higher RPM and could explain the symptoms) of unknown source.
- was the scope powered from 60 Hz or battery ?
- Scope was powered by wall charger, battery is not working.
- any idea what could be the source ?
- does the pattern repeat with multiple engine rotations?
- Yes, the up-down-up primary pattern repeats. => that suggests mechanical abnormality of the steel wheel.
- Is the sensor mounted axially or radially ?
- Is it possible that the sensor or wheel somehow vibrates ? (we had that with the torn flywheel dampener causing similar symptom with the VR-signal above 6600 RPM in a double-VANOS BMW S52). For this divby-N (similar to the c270 auditrigger with 135 teeth) the sectrig signal is allowed to move 1 primtrig tooth back'n'forth (but not 2).
- When engine stumbles, is the type of trigger-error still the <.fill in exact type of trigger error.>
- it seems that this can/should be cured in HW.
- eg. more regular wheel
- or tuning the VR signal conditioning (higher R181 ? Maybe 270k ?)
I also applied a 1k to ground on the sec trigger (per email) with no noticeable change in results. The sec trig scope trace shows a slightly better dip below 0v now
New scope trace:
Yes, this scopeshot looks better. Mean (DC) voltage is still above GND (if there were no symptoms, we would probably be satisfied with that primtrig ... with symptoms, of course we are concerned about everything).
- Is the 18k internal pullup to +5V still installed internally ?
We also tested with no divider (tooth width=2.75 deg): it worked, but peak-RPM would likely be limited.
This special case of auditrigger worked on bench, including the per-cyl delay, but only after tricking "divider-off, than "divider-on" (so we're working on initialization change, needed so it syncronizes without this trick, currently stuck in tooth_cnt=FF and wouldn't spark without this hack).
Per-cyl ignition delay is needed (because 43/3 != 14). Note: RPM reading might fluctuate, so divby43 is better choice
- divby3
- toooth width=8.5
- Number Of Teeth On Wheel: 43
- First Trigger Tooth: 0
- Next Trigger Tooth: 14
- Angular Width Of Tooth: 8.5
- Filtering and below: Disabled
- reftooth: 0 28 14 0 28 14 x x (because teeth 3,4,5 does NOT exist)
- per-cyl ign delay: sg. like 0 5.5 2.75 0 5.5 2.75 0 0 degrees
- needs verification with strobelight + adjustment if necessary
- injector outputs: only injgroup 0, 4 and 5 were used (this might seem unconventional, it's all because the sectrig is not 720 deg but 360 deg),
- so we enabled 2 inj outputs (we paired the outputs that are actually 360 deg opposite) in injgroups 0,4 and 5 (and left injgroup 1,2,3 empty).