AFC 2, advanced timing?

[pickens]

I installed my AFC the other day. I immediately noticed that my base timing was around 10-12 degrees. Before the install my base timing was generally in the 8-10 degree range. Is this normal, or do I have to play with the AFC somehow. Also, all my settings were zeroed out. I logged a few runs, and my WOT timing curve looked normal, maxing at 19 degrees with no dips. I'm just a little concerned about the advanced base timing.

 

[kpt4321]

If you didn't touch anything on the SAFC, then the base timing will not be effected.

Where are you reading the timing from? I presume you are reading it from the logger? If this the case, then you are not reading base timing. The logger shows total timing advance assuming 5 deg BTDC base. It will move around at idle to control engine speed.

 

[pickens]

correct I am reading the timing from my pocketlogger. Are you sure it does not show base timing. I thought the base timing for 2gs was something like 8 degrees. At idle it hovers around 8-10 degrees. But nevertheless, I didn't think my timing should've been affected by the AFC, but somehow it is. It is definatley averaging 2 degrees higher than before. I guess I will just have to quadruple check all the connections.

 

[kpt4321]

Nope, that does not read base timing. The SAFC should not have effected it.

No blue wire mod, right?

 

[pickens]

Nope no blue wire mod. Hmmm.

 

[psychlow]

Uhh... so, you got out your timing light, grounded out the correct terminal, and your BASE timing (measured on the crank pulley) changed from before the installation? Or are you talking about TIMA (timing advance) on your logger?

Timing advance is affected by many factors, including the outside temperature of the air. Colder temps = less timing. Barometric pressure (which varies day-to-day) can also make a difference.

EDIT: Realized you can't read knock before I posted this, but somehow I still didn't catch it in my post.

 

[kpt4321]

Originally posted by psychlow
Uhh... so, you got out your timing light, grounded out the correct terminal, and your BASE timing (measured on the crank pulley) changed from before the installation? Or are you talking about TIMA (timing advance) on your logger?

Originally posted by pickens
correct I am reading the timing from my pocketlogger.

 

[psychlow]

Shhh, you.

I was making a (somewhat educational, somewhat sarcastic) point that you can only read base timing with a timing light.