1.9 Litre TD AAZ injection timing options

[jtanguay]

so, i have a dumb question...

if you set the timing to 1.00, would the cold start advance be useless?  or do you have to advance it too?

is there a lot of risk from going from stock (0.86) to 0.95 or 1.0?

from what QuickTD said, it seems that the single reason for retarding the timing was to reduce NOX emissions...  so i dont think there would be much risk, but lots of gain

if you set timing to 1.00 then the timing advance would increase it to 1.05.
if it was a really cold day, then that could be the difference of your car starting, and not starting... or just starting really rough

[burn_your_money]

Exactly what jtanguay said

[QuickTD]

By the way, does anybody know what the VW part number is for the injection pump lock pin for the AAZ engine with the split pulley, as I have? I have the one for the old 1.6, but was surprized to see this one needed something different.

Get a long 6mm bolt, one with about 50-60mm (2 - 2-1/2") of unthreaded shank. Cut off the threaded portion. Done. An allen bolt works well, the knurled head is easy to grip.

 Regarding the risks of advanced timing, there are none.

[935racer]

I spun a locking tool on the lathe, but before that I used a 6mm drill bit and one time I changed my dads TDI T belt in his driveway so I used a 6mm allen key.

[AAZJetta]

When I pull out the cold start advance cable on a cold morning for a cold start, it seems to help even more, even though I have the pump set for 1.00 mm now.  I took great pains to precisely and accurately set the pump timing to 1.00 mm as a final setting.  I am using Pentosynth (VW spec 505.00) synthetic oil in the engine.  Road performance is excellent.

I will be taking the car on a 400+ mile roundtrip next week through southern Utah/Arizona, all under open highway conditions, and I am anxious to see what the mileage will be at the new pump setting.  Although I don't expect to get what the car is capable of since the weather is much colder now, I do expect to see an improvement in mileage.  Diesel here is 2.57 USD/US gallon currently.

Then it will be on to the transmission (ACN), intercooler, and synthetic REDLINE MDL in the trans. for maybe more improvement.  My goal is great fuel economy with nice performance as well.

By the way, a great addition to this car was an electric cruise control (no vacuum source needed) made by Rostra.  I used the magnetic pickup option for the speed signal.  Works great.  Took me most of a day to install, and I used the stock switches  (signal, cruise set, resume, etc,  and clutch switch) from an '89 GTI gasser.