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Audi A6C4 1995 (1996) AAN engine installed in 2025 (Vizsgaztato Pityu) ---- '''Crankhome VR''' trigger see TriggerScoping and InputTrigger/AudiTrigger Checked crankhome-VR with DSO138 scope. It was -peak first, than +peak, NOT good, had to be swapped as instructed on VemsAudiAan * '''Swapped red and violet wires.''' ** Checked crankhome-VR again with DSO138 scope, '''now good: +peak first, -peak later''' since LM1815 triggers on negative going zero crossing. http://www.vems.hu/files/MembersPage/Quattro/Audi_A6C4_AAN_2025_install/DSO138_Audi_AAN_20VT_crankhome_positive_peak_first_for_VEMS_ECU.jpg The wires were good with red in middle (maybe contradicting the VemsAudiAan page but scope is always right). http://www.vems.hu/files/MembersPage/PeterJensen/audi_trigger/stik_trigger_morm.jpg ---- '''Engine started on first attempt.''' Actually it was behaving, and powerful... But owner already contracted with some VEMS tuner (maybe Kulinpapa?) to tune it on 4-wheel dyno the next day. So we did not press it. But lambda was at least quite reasonable at high power also. * overrun fuelcut (when throttle is released, but engine RPM is still high and fuel is cut so engine goes to idle) could be somewhat smoother... ---- '''Config and short log''' * [http://www.vems.hu/files/MembersPage/Quattro/Audi_A6C4_AAN_2025_install/v3.3_u021315-A-2025.04.24-15.53.LehetMenni1.zip log and config zip] with 1.2.38 firmware ---- '''Notes''': LSU4.9 sensor was only put in the exhaust after the engine started. Actually started on first start-attempt. (not when scoping, obviously since ECU was not installed). * There is no point in contaminating the LSU4 sensor in case engine does not start (most often it does NOT start on first attempt, there are usually many things to check, timing-light the engine, and so on...). ** The LSU4 sensor can last 1000+ hours if running on cruise power close to stoich, but fuel, soot or other contamination shortens lifetime significantly. ** Dropping on the floor shortens LSU4 lifetime extremely quickly. * The connectors on the SSC5-LSU4.9 adapter cable were too big to pull through the firewall of the Audi A6C4. (was much easier in Audi-100 and Audi-200 racecars that had less stuff). ** we '''checked the SSC5-LSU4.9 adapter cable against''' the '''documentation''' (colors matched LSU4.9 sensor colors so it was easy) ** used a '''wood-screw''' (slightly screwed into a small hole of the '''red plastic''') to remove the red back-out plate from the SSC5 connector. ** used a small screwdriver ('''extraction tool''' is better) and '''removed the receptacles (pins) from the SSC5 side'''. folded 2 back so only 3 was looking forward (smaller head when wrapped with tape). ** unscrewed the thick positive (black) '''jumpstart wire terminal and used the thick wire (already going from cabin to the engine bay as in the factory setup) to '''pull in the SSC5-LSU4.9 adapter cable from the engine bay into the cabin'''. ** applied a thin '''rope''' and pulled that through also, so the thick jumpstart wire is not pulled with the SSC5-LSU4 cable, but with the rope (just in case the jumpstart terminal sticks inside, or something... It was not too bad, used some lubricating silicone grease just in case). ** plugged in the SSC5 pins (correct order), correct direction mechanically, made sure they clicked in. ** DVM measurement (correct order, colors, connectivity). ** Inserted the red plastic back-out plate. ** '''Maybe it would be nice to sell the SSC5-LSU4 adapter cable without the SSC5 side plugged in?''' (I understand the adapter cable is tested in its entirety this way, together with the sensor if the correct option is selected in WebShop). ** request '''Please provide SSC5-LSU4.9 adapter cable without SSC5 side plugged in''' in shop order-comment... that makes life slightly easier. (4 minutes to remove 5 pins, no big deal; but requires extraction tool)
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