advanced timing pros and cons

[TylerDurden]

[8v-of-fury]

I timed my 88 1.6 TD to 0.040" and it was WAY too advanced to start cold.. I had to back the pump off like 1/4" in movement to come down to a suitable cold starting setting. I didn't put the gauge back in it, but its much lower than 0.040"

You must be dealing with some extremely worn engines 

[tyb525]

Well that would explain why I could hear an increase in clatter to a point, then disappear in higher rpms. Just like without the cold start, only more clatter in the lower rpms.

My cold start doesn't really increase idle speed though, but from what you all are saying, it should. I never heard anyone say that till now though. It never has since I've had the car. But it does "increase the clatter" and definitely helps at startup. So if it doesn't increase the idle, what does that mean?

[8v-of-fury]

You may have a pump without the idle increase part. Is it the Early 80's Rabbit in your picture?? If so, that pump does not have an idle bump on the cold start lever.

[tyb525]

Yep '81 NA. So that would make sense then.

[TylerDurden]

You must be dealing with some extremely worn engines 

1991 ECO block & head. Compression was 420psi across the row before I changed the HG a couple weeks ago... haven't done another compression test, yet.

[8v-of-fury]

'Ay but what of the pump and injectors, compression doesn't have 'much' to do with injection.

0.053" is 1.3462mm! that is insanely high lol.

[TylerDurden]

Ja, .053" was a bit much, but it started after 3sec cranking and ran pretty well after warming. Back to .048" and starts easily.

I haven't checked break pressures & IP internal pressure. Just happy it starts easily and runs well. 

[bbob203]

so what effect does lower breaking pressute have one egt and on timing?

[TylerDurden]

AIUI, lower break pressure will inject earlier, advancing timing for that injector.

(I have very little info on this engine, I pulled it, slapped a HG on it and stuffed it in to my 85. No pop-tests, no IP pressures. Runs a shade chuggy, but doesn't miss.)

[bbob203]

looking like .045 timing is a touch to advanced for starting my engine below 30 degrees farenheit. On a warm day though it spins right off.

[8v-of-fury]

The TD? or TDI?

[bbob203]

The TD? or TDI?

td. I wish the tdi was going still sitting in a pile in my Garage.

[R.O.R-2.0]

looking like .045 timing is a touch to advanced for starting my engine below 30 degrees farenheit. On a warm day though it spins right off.

WHA?!

TOO MUCH timing to start cold?!

my engine starts great when its cold.. the more timing, the merrier..

isnt it TOO RETARDED of timing that messes shizz up?

[bbob203]

Maybe my compression sucks