Spark plug issues

[RETed]

Originally Posted by project86

That sounds like pretty good number on an internally stock NA 20B. What are the reasons for advancing the timing in general? Also.. .cant running too rich lead to pre ignition just like running too lean?

Yeah, another 20B with stock twin turbos managed to put down 8hp more than our 232 #.

From my experience...

In a very simplified procedure for tuning, you want to advance the ignition timing for any "cell" in your ignition map right before it start to hit preignition.
This will give you best power.

Yes, overly rich conditions can cause "afterburn" out the exhaust.
Due to this afterburn, it can cause a lot of bad harmonics, which tends to hammer bearings and seals.
I've personally seen engines let go due to too much fuel (burning out the exhaust).


-Ted