Dynamic boost start setting required for TDI?

Hey gearheads!

I have an Audi 80 TDI (year 1995), and I heard from a workshop foreman that adjusting the static fuel injection timing using a measuring gauge is perfectly sufficient! Can we trust this statement?

Thank you in advance!!!!!!

Hi.

According to the factory specifications, the master's statement is fundamentally incorrect, because a fine-tuning process using a diagnostic tool is предусмотрено for TDI engines - and, in my opinion, for all VP 37 engines, regardless of their year of manufacture.

What this doesn't completely rule out, of course, is the existence of highly skilled mechanics who can reliably achieve the specified tolerance range using a measuring instrument.

But people with "golden hands" are certainly very rare...

Hi Ulf!

Thank you for the tip! I replaced the timing belt myself a few months ago and adjusted the timing statically using a dial indicator, following the instructions in the manual ("How it's done"). Does this mean that I'm probably driving around with incorrectly adjusted timing (even though the car passed the emissions test without any problems)? Are there any affordable measuring devices available for hobbyists who want to perform dynamic adjustments?

Thank you very much!

Best regards, Christian Hähnlein.

I have witnessed many timing belt replacements on TDI engines (1Z/AFN). So far, the static setting has always worked 100%.

Perhaps 'sch' was intentional, but what the author of the instructions had in mind, I don't know.

Quote:

Are there affordable measuring instruments available for hobbyists for dynamic adjustment?

Yes, a simple analog multimeter is sufficient --> Technical article on how to adjust the pump

Quote:

I have witnessed many TDI timing belt replacements (1Z/AFN). So far, the static setting has always worked 100%.

Hmm... how do you define "100%" in this context?
Was the setting actually within the tolerance range of the 1551, or was the wagon "only usable after being jump-started," and was it not noticeably looser than before?

What tool was used to make the adjustment? And what would something like that cost for a hobbyist mechanic?
Perhaps it would be possible to formulate a tip for purely mechanical adjustment, even though it goes against the manufacturer's instructions.

We checked the settings using diagnostics, but everything was fine. So, we decided not to adjust anything. The cars run great and consume very little fuel. That's enough.

The pump was adjusted using a measuring gauge, which is included in a set (in my case, in a small red box) for initial setup before starting the injection process. The set includes an adapter, extension pieces, a pump locking bolt, and a camshaft locking tool. I think it used to cost around 250 German Marks.

After twisting and tightening the pump, the adjustment was checked several times (usually 3 times), with the motor being manually rotated about 10 times in between. That's it.

I recently spoke with a tuner about this, and he mentioned that he always sets the fuel injection start to the upper limit of the tolerance range because, in his opinion, the engine starts better and also has 2-3 horsepower more.
Is this okay, or are there reasons why one shouldn't do it that way? (I'd like to know if he was just telling me 'nonsense,' since I've been disappointed by enough workshops already...)

As long as we remain tolerant, everything is okay. It just requires a little patience when setting it up.

Draven wrote:

I recently spoke with a tuner about this, and he mentioned that he always sets the fuel injection start

to the upper limit of the tolerance range because, in his opinion, the engine starts better, and it also has 2-3 horsepower more.
Is that okay, or are there reasons why one shouldn't do it that way?

Hi.

According to the theory of closed-loop control systems, no additional power should be produced because the engine control unit corrects any incorrect pump settings, as long as the control range is sufficient.

It's possible to achieve better starting performance because the injection timing isn't regulated until the idle speed is reached; instead, it's controlled by a fixed value that adjusts along with the pump setting.