Adj. cam gears then matching Ignition timing?

[Drift_SM]

I plan to move the power band a bit lower for my motor.

When advancing both cams gears 2.5* from zero. What would I set my ignition timing at?

Would I match it by advance ignition timing 2.5 more degrees from 5* BTDC? (7.5*)

Could I advance ignition timing a little more then the Cam Degree? say (9.5*)

This is on FP1 and FP2 cam combo, and AEM gears.

Thanks guys.

 

[1992awdlaser]

You still want to set your ignition timing at 5*.

 

[Drift_SM]

Ok, so no matter what your cam degree is the ignition degree stays at 5* BTDC.

Well that almost to simple for a DSM.

Thanks Bro, I'll take your word for it. Im heading home to FL for a week and plan to get the car to the track. It ran 13.9 in NH....on 12 psi WTF with exactly the mods in my profile. No tuning or fuel enhancements, with the exception of the 190 pump. Im hoping maybe some better numbers by moving the band lower and setting the psi to stock finally. 13.5 ET would be pretty impressive for what the cars running with.

Any other additional info is always welcome. I love answers with explanations, never hurts to learn.

 

[turboglenn]

Your ignition timing is a correlation to crank angle degrees BTDC, so adjusting the cams may effect the ignition timing as far as needing to reset it since the CAS is driven by the cam which you moved. But, it won't require a compensation factor or anything like that to know where you're setting it now that the cam has moved. Just set it back to 5* as stated because you still want the spark to fall at the same amount of degrees BTDC as measured at the crank.

My statement about the CAS and Timing are all asuming you are using a 1G CAS that has both cam dn crank signals based off the cam, if you're still on stock 2g timing setup where the Cam AND Crank angle sensors are seperate you cannot adjust the timing, it will figure in the value of where the cam and crank both are and compentsate accordingly keeping the timing perfect. One of the few things i'll give OBD-II a positive note on

 

[Drift_SM]

I've had it at 5*. I set it along time ago with a scan tool as soon as i got the new motor running.

I had super bad luck and accuracy with the green top...misfire codes and bogging.

Got the black top and it was extremely accurate and easy to set the timing.
After that, she was a new beast.

Thanks for the info guys. I over looked the fact that ignition timing is adjusted according to the crank and piston on its rotation...not the valves opening/closing.