ign timing adjustment

[e170drvr]

Hey guys, just want to make sure I am doing this right, since this is a critical adjustment for the turbo. I have a stock 87 930 timing seems a bit off. with a warm engine I checked it at 4000 rpm on the timing light, I have heard the guage in the car is not as accurate. I disconnected and plugged with golf tees both distributer vacuum lines. Left one is advance and right is retard. I assume I am looking at the 26 deg timing mark and it appears to be slightly retarded from the index. Am I checking this correctly? Also from my reading for adjusting basic spec you need to go timing, CO, then idle, correct? Sorry guys I don't have any kind of shop manual for this car, did everyone here buy the expensive shop manual from Porsche, or is there another alternative? Thank you, any help is appreciated.

[wcc]

From the book for a 1978 and on the timing specs are:

10 deg +/- 2 deg ATDC at 1000 +/- 50 RPM with the hose connected.

26 deg +/- 4 deg BTDC at 4000 RPM with the hose disconnected.

This isn't where mine ended up being. Because with these numbers it ran like CRAP! I set it to where it runs the best. I wonder if somewhere along the line my dist was removed and installed one tooth off or maybe I have some other issue I need to sort out to get those numbers, I don't know.

BTW: I used the tach on the dash to set at 4000RPM. Sometimes you can pick up a manual on Ebay. That's where I got mine.

Good Luck!