Originally Posted by SR20GTi-R 
On a tunable ECU base timing means nothing. All it is doing is syncing the Dizzy/Ecu with mechanical timing.
I can run a 20 degree base and it will be no different than a 10 degree base.
On our stock/bolted on cars we advance timing via mechanical adjustment, base is 15* and we move it up to say 19*, which moves the whole map to 4* advance.
On a tunable ECU we leave it at 15* because we have more accurate tune-ability via 16x16 cell map. But the same still applies for base timing, before I knew how to tune a timing map with my Calum RT, I increased the base to 17 and it was a nice difference (as in the concept stays the same as a stock setup with just an advance).
Alright so say at 18 psi on 10.3:1 setup with a smaller turbo (T28), your are down to 2* in your cells ( 2* advance to the base 15*, which means your actually running 17* in that cell), and your still knocking, you can't go into negative numbers on a timing map. Thus if you reduce the base to 11*, your 2* advance in the cell should translate to 13* advance in that cell, correct?
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