I am having a problem getting timing observed on the timing light to agree with Megasquirt.
I set the distributor at about 0 degrees timing based on where the rotor is lining up to the #1 plug.
I can start the car and it idles ~1400 pretty steady with ~13:1 AFR.
I set tunerstudio to "locked timing" at 10 degrees.
When I check with a timing light it shows advance at around 50 degrees ?!?! I tried 3 different timing lights with the same outcome.
The trigger wizard is open and when I increase the offset up to ~30 degrees the motor starts and runs OK, and the timing mark progresses towards (but never quite to) 10 degrees. Above 30 degrees offset the motor dies immediately.
I seem to be chasing my tail but I need some help, I've never had this problem before. I did check and follow the steps on the MSefi page : https://www.diyautotune.com/support/tec ... se-timing/
I did check with the crank pulley manufacturer that the marks are correct and verified cam timing.
Thanks for the help please and thank you
The motor is a 1976 911 with a 12-plug JBracing distributor. Ignition triggered by a vr inside the distributor that has timing locked.
Initial timing challenges
Moderators: jsmcortina, muythaibxr
-
- Helpful MS/Extra'er
- Posts: 111
- Joined: Sat Jul 23, 2005 6:12 am
- Location: Toronto, Ontario Canada
Initial timing challenges
1983 Supercharged 3.2L Porsche 911 track car - Adaptronic
1976 3.0l twin-plug Porsche 911 autocrosser - TS v3.0.28 and MS2/Extra3.4.2
1971 2.7l Porsche 911 Targa S - Weber Carbs
1976 3.0l twin-plug Porsche 911 autocrosser - TS v3.0.28 and MS2/Extra3.4.2
1971 2.7l Porsche 911 Targa S - Weber Carbs
-
- Helpful MS/Extra'er
- Posts: 111
- Joined: Sat Jul 23, 2005 6:12 am
- Location: Toronto, Ontario Canada
Re: Initial timing challenges
Nevermind, I figured it out. I'll share what I found though...
The rotor contacts are fairly narrow, so I had to gradually clock "back" the distributor gradually and then adjust the timing offset using the trigger wizard. I think because the rotor tips are so narrow that adding too much offset in the right direction was trying to fire the #1 cylinder before the rotor was within reach of the rotor to the cap terminal.
I have a surging/oscillating idle now to deal with still.
The rotor contacts are fairly narrow, so I had to gradually clock "back" the distributor gradually and then adjust the timing offset using the trigger wizard. I think because the rotor tips are so narrow that adding too much offset in the right direction was trying to fire the #1 cylinder before the rotor was within reach of the rotor to the cap terminal.
I have a surging/oscillating idle now to deal with still.
1983 Supercharged 3.2L Porsche 911 track car - Adaptronic
1976 3.0l twin-plug Porsche 911 autocrosser - TS v3.0.28 and MS2/Extra3.4.2
1971 2.7l Porsche 911 Targa S - Weber Carbs
1976 3.0l twin-plug Porsche 911 autocrosser - TS v3.0.28 and MS2/Extra3.4.2
1971 2.7l Porsche 911 Targa S - Weber Carbs