Quote from: theman53 on June 06, 2014, 07:51:46 pmI took it as "for this HP time it to____ with the timing light"Also, in the pics above I do not see a timing spec for the timing light, just the mm gauge style, so they are kind of irrelevant to this thread.If it were as simple as "time it to ___ with the timing light", why would VW change the spec for the next decade or more?
I took it as "for this HP time it to____ with the timing light"Also, in the pics above I do not see a timing spec for the timing light, just the mm gauge style, so they are kind of irrelevant to this thread.
...BTW your Bieber avatar is awesome.-Malone
I believe that VW has consistently given a lower than optimal timing spec in order to reduce NOx emissions.
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.................................
OK, Twas sunny and very nice in the driveway today so I pulled out the optical and the pulse adapters and the timing light. Also dug out the timing dial gauge and all the needed sockets to do a multitude of timing setups.I started with my base setting of 85 on the dial gauge just to test out the process. That being set the timing to the desired dial mm number, Spin engine by hand and recheck setting. Then pull the dial off and set it up to run and take two measurements. One with the Pulse adapter located about 3/4 of an inch above the injector nut and the other with the Optical (Lumy) adapter. I worked up the scale to 110 mm and then picked up the 70 and 80 measures on the bottom. Once I had all the readings I wanted I rest the timing to 88 as per label on the strut. The base setting I had 85 mm was giving me 33 mpg in the stop and go city traffic on my short 3 mile jaunts to work. Temps in the 40s generally during that time. And ran the car for 450 miles between last fillup. I added an extra five gallons to the tank some time in March. So the results are charted below and I just have to wonder why my pump does not get down to the 12 degree mark that I was expecting at the lower settings. Or at the base setting for that matter. Perhaps my internal IP pressure is too high, and I am running some advance at idle al the time? I have read that one might need to run the idle at 1000 RPM doing this sort of thing but I kept mine in the 840-870 RPM range. On the chart the red line is the Pulse adapter and the left axis is the scale, on the right is the Optical readings per mm setting. I threw in the linear trend line to see how well it lined up and to allow others to perhaps get to the numbers one would expect to be here. I am not sure why there is that stairstep effect going with the optical readings. Maybe I was not aligned with the pointer dead on.Just the same a lot of time to make all the adjustments and double check all the process. Open for discussion on what we can learn here.