Its all relative anyway. ...Adjust the timing to the advanced side a small increment, and make some more Norwegian dyno runs. If things are getting better add some more initial advance. If you are getting slower take some out and do it again.
The piezo adapter fires at the start of injection. The micro-expansion of the metal line is what charges the crystal pickup and it fires it's pulse when the line starts to relax which is at the actual start of injection which precisely coincides with needle lift. Yes, the piezo pickup DOES detect needle lift very accurately.......................
All the ones I've counted so far have 125 teeth.IIRC, Mark in UK might have a different count on the Quantum.
Quote from: libbydiesel on February 10, 2014, 10:49:01 amThe piezo adapter fires at the start of injection. The micro-expansion of the metal line is what charges the crystal pickup and it fires it's pulse when the line starts to relax which is at the actual start of injection which precisely coincides with needle lift. Yes, the piezo pickup DOES detect needle lift very accurately....................... Is this info from the SnapOn pulse adapter manual? It would be interesting to verify with an oscilloscope if the injection line pulse coincides with needle lift. Wouldn't be too difficult to set up on an engine with a needle lift injector. I think all TDI's have one. IIRC needle lift is on #3 cyl? Why did VW do that instead of on #1?
Quote from: 92EcoDiesel Jetta on February 10, 2014, 02:37:36 pmQuote from: libbydiesel on February 10, 2014, 10:49:01 amThe piezo adapter fires at the start of injection. The micro-expansion of the metal line is what charges the crystal pickup and it fires it's pulse when the line starts to relax which is at the actual start of injection which precisely coincides with needle lift. Yes, the piezo pickup DOES detect needle lift very accurately....................... Is this info from the SnapOn pulse adapter manual? It would be interesting to verify with an oscilloscope if the injection line pulse coincides with needle lift. Wouldn't be too difficult to set up on an engine with a needle lift injector. I think all TDI's have one. IIRC needle lift is on #3 cyl? Why did VW do that instead of on #1?That would be great. Please get back with the test results ASAP. Which injector has the needle lift sensor is irrelevant to the engine management. It just changes the one variable in the code. I imagine they used #3 in order to most easily maintain the same metal line length.
... the start of injection and start of combustion is very closely related.
I'll let you spend your time to educate yourself on it if you want to. I couldn't care less.
...BTW your Bieber avatar is awesome.-Malone