C_randyjones Posted August 13, 2008 Share Posted August 13, 2008 I have a tune from PDX tuning that originally logged timing numbers 20-24 at WOT in 4000-5000 RPM range. Over the last 9 months things have changed.Now the log shows 16-18 in this same RPM range. Could this DRIFT be due to aging spark plugs? The car now has 32K with original plugs. What else should I consider. The car also is a little slower in the 50-80 pull. Link to comment Share on other sites More sharing options...
Infamous1 Posted August 13, 2008 Share Posted August 13, 2008 Highly doubt you were running those timing numbers in that range with good boost. I can't even run that high on race gas. However 16-18 sounds more appropriate, also there is a table in the ECU that compensate timing base upon intake temp. In colder weather it will add timing and in warmer temp it will pull timing. Link to comment Share on other sites More sharing options...
C_randyjones Posted August 13, 2008 Author Share Posted August 13, 2008 Here it is....if the attachment worked. Ok, I'll have to work on getting the log formatted so I can attach it. Gotta work right now Link to comment Share on other sites More sharing options...
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