AUDIS
08.02.2007
So reality is: my first Genboarded cars will be Audi 20V turbo and n/a.
Here is board modificatons for cramhome signal (crankhome + Hall on camshaft)
- R91 * C103 = 10k * 1nF = 10usec
- C103 does some filtering (not strictly needed)
- for the secondary trigger, the HALL masks out the LM1815 output. There is much more than 55microseconds for the HALL edge to settle
- though only 55 usec between primary trigger teeth pulses @8000RPM, so you need R57=33k (instead of 75k. If you stuff a 75k on top of the original 75k, that is 75k/2 is OK, but the traditional 75k might prevent reaching 7000 RPM on this engine with 135 tooth trigger)
question:
I imitate Audi Trigger using WAW file: 270 pulses on right, 1 pulse on left chanel. 1.0.53 firmware.
Everything works OK until ~6000Rpm. Then starts trigger errors. After 7000 - no sync at all.
It seems thigs goes even worther with new 1.1.11 firmware.
Q: How to sort out what is cause: sound card resolution or something with Genboard?
Disquiet is because 2 of 3 Audis must rev up higher than 7000!
- Audi have restricted turbo by rules ~300hp max. I think ~500Nm@~3500 and ~300Hp@~5000
- is project with big turbo and target power >500Hp
- is n/a engine with deep modificatons for rallying ~250Nm@~5200 ~230hp@~6900
here is my waw files:
Audi http://www.vems.hu/files/GintsK/Audi_270&1_4690Rpm.wav
Audi http://www.vems.hu/files/GintsK/Audi_270&1_6840Rpm.wav
60-2 http://www.vems.hu/files/GintsK/60-2.wav
36-1 http://www.vems.hu/files/GintsK/36-1.wav
I use http://www.goldwave.com/ Goldwave sound software. They have evaluation version: free and very sutable: simly loop .waw say 8000 times. And under tools is easy to control playback speed evenly.
Use 96000 samples/sec wavfiles for this 135 tooth pattern (at least if you go high RPM), not 44100 samples/sec.
third question:
Q: C30 cap between primary 135tooth VR input and ground? Is't it too big??
R56 * C30 = 18k * 1nF = 18 usec
18 usec is less than 55 usec/2, and even with a 27 usec timeconstant, the signal would reach the LM1815 input, just slightly lower amplitude (still much higher than needed to trigger). So this will not prevent reaching 8000 RPM.
However, if you want to reach 8000 RPM very quickly, like from 4000 .. 8000 in 0.4 sec or faster, than the adaptive hysteresis arming threshold might not be reached and trigger errors might be the result. A 7..8000 RPM revlimit in neutral gear is not a bad idea anyway.
This document:
http://www.vems.hu/wiki/index.php?page=MembersPage%2FTonciLoncar%2FQuestionsAndAnswers beside of all is mentioned:
...if there is noise C30 (which helps shape the input signal) may be broken, try replacing it if you don't have a scope 1nF is will give you a 16kHz filter frequency, you could easily have a bit more here for most applications....
But 16kHz is 7111Rpm for audi 135 teeth Wheel!
++++++++++
Update early 09.02.2007
Remove c30 and able rev up to 9200 on my bench test on sound. I use Audi_270&1_4690Rpm.wav.
Trigger errors is still present: more than 16/sec@7100.
It becomes actual little over 6000 and most serious is ~@7000. Strange: @~8000 W counter on LCD became slower.
Here is datalog:
Cursor is at 6528 Max peak is 9375
With new 1.1.11 firmware is unable rev up higher than 6500 and counter jumps like messed!
This relative success achieved with 1.0.53 and
http://www.vems.hu/files/GintsK/Trigger%20test_1.0.53_01.msq
msq for new firmware:
http://www.vems.hu/files/GintsK/Trigger%20test_1.1.11_01.msq
Q: Plese help me with any sugestions!
+++++++++++++++
Update mid 09.02.2007
Another observation:
This situation I got using balance buutton on allready "started engine": it works on 135(270)tooth signal only! No trigger errors. But reality - no second trigger signal at all.
---
and this is with normal mid balance and C30 soldered back
Both tests 1.0.53 and Audi_270&1_4690Rpm.wav
Keep an eye on MembersPage/MarcellGal/PowerAndTraction, we purchased a 5cyl audi (engine should jump to bay on 2007-03-09) to have all the details hammered out so installation and diagnostics becomes smooth (which it is not yet) on these nice engines.