I have had a few things going on outside of working on my old GMT400. I got back to it a little last night. I found that my timing tab is off by 2 degrees. So when initial timing is set to 0 by the tab, the real timing is actually 2 degrees retarded. So my question is how do I deal with this in the tune?
I'd like to leave the external parts alone so that the next owner can set up timing as they should with a stock vehicle to 0 degrees initial on the tab.
The $0D mask doesn't seem to like negative values for initial timing. Do I just add 2 degrees advance to my timing table?
I basically have the timing table from fast355 yet only changing some in the idle area to keep it from surging (May not have been due to timing)