Ok, both me an the tuner are stumped here. We are commanding 17* timing and sometimes ending up with 7! As an example @ 5400 and 210kpa my base timing is 27* and subracting 10* at that kpa so I should end up with 17 right? I'm getting 7*. No knock, ECT is not pulling timing, IAT's are not pulling timing. Don't know what's going on with it. We tried turning off the knock sensors, zeroing the iat and ect tables and nothing changes it.
Here's a run down of the engine
402ci ls1
twin turbo
cos3 3bar
engine is in a 64 Chevy II
any Idea's?