It depends on the car. On VW TDIs the reported value is the actual start of injection value in degrees BTDC, negative values are ATDC. But on all gassers I've tested it, the higher the value, the more timing advance there was. Mid 40s is about as high as it'll get in the Elantra.
Last edited by tasdrouille; 01-27-2010 at 01:01 PM..
Reason: Had BTDC and ATDC mixed up
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