LT1 distibutor CKP Lo res angle question

[WASyL]

I just swapped PCM from 96-97 to 94-95. Thru 96-97 PCM i have checked that CKP: Lo Res Angle is -9 deg (new timing chain set and distributor), so now on 94-95 should i advance or retard whole ignition table to match that ?

best regards

[kur4o]

Does this compares correlation between crank sensor and optispark sensors.
9 degrees is much, even for stretched chain. What is normal position in service manual. Does it need any attention, or is within range.
It could be a slack within opti sensor gear.

[WASyL]

no stretched timing chain, just installed new one, opti is new too, just these chinesse opti's that customer bought come so inaccurate, 96-97 PCM treats -10 to +7 as not to request MIL but i dont know if 96-97 takes to account and comesates ignition timing, -10 is already alot of timing for performance so want to compensate in tune, just don't realy know if i should advance or retard timing in ignition map table.

best regards

[kur4o]

There is initial value for timing, It is set to zero, you can play with it, But better run some tests and see if engine likes it.
EOIT will also be affected, might tune that too.

[WASyL]

thanks