Hello,As i understand, the base pump for this undertaking is a AAZ unit + 1z head, right? Would it be possible to use a 1.6 td from a jx engine, as this leaves more space to the engine cover in a vanagon. I got a syncro, so i could put in a aaz pump, but they are hard to source in germany, and there's a lot of jx pumps in my workshop. What is the problem with 1.6 pumps + 1z head so everybody uses the aaz pump?Holger
I have installed a tdi ECU on the cranksensor and #3 injector and made some experiments with vagcom.The tdi is installed in a dodge dakota m-tdi with 12mm head and .230 injectors.The injection quantity returned by the vagcom was way out, but the timing was coming out really good. At 0.96mm the timing reads 3.5deg a idle.We put the timing at 6deg at idle (like a tdi-e with 5deg more timing in adaptation channel) and made some runs. Timing decreases between idle and 2000RPM at 90km/h, (from 6 to 3) which could be a little less timing than a tdi-e. We tried advancing timing at idle to 11deg, we had 8-9 deg at 2000RPM, but this was way to much as the engine would go to higher RPM with much difficulty.We didn't made a log of the timing from 1500RPM to 4000RPM at different load, but we might next time. We were able to see that timing was decreasing between 1/4load and 3/4load and increasing very fast at the end. (we could even feel the pickup accelerating with timing). So we screwed in the governor axis half a turn and then the timing was increasing gradually up to full load.At 90km/h and 2000RPM the timing was around 5deg. On a tdi-e, timing is around 0deg at the RPM and load.At full load, timing was between 11 and 12deg at 2200tr. On a tdi-e timing is around 8 deg at this RPM and load.Overall, the pump act just like a tdi-e one with 5deg more timing in the adaption channel.I think we would need some kind of stopper on the pump to make logs at differents load on the pump and at higher RPM (with 12mm head, we dont like to go over 3000RPM)THe dakota is 4x4. EGT stays under 800F when cruising over 100km/h. Oil temp rarely rise up to 200F (usually 180F) and radiator fan pretty much never runs.
your ecm setup
So I removed the timing cover, drilled a hole thru the injection pump bracket so I could adjust the governer axis without removing the pump. I found this trick on the french side of the forums. I then turned the axis in one full turn and bingo! Instant pressure increase under load. Too much actually. I had to back it off quarter turn.