Hi all,
Fairly new to this tuning thing, but have had some great guidance so far. I've got a 2006 Cobalt SS/SC, LSJ engine, TVS 1320 blower with 2.9" pulley, Siemens 80# injectors, K&N CAI, ZZP Shorty Headers, 2.5" catless downpipe, some resonator, back to a Megan Muffler, running E85. I've been slowly playing/learning by doing some MAF tuning on idle and cruise, but I'm noticing my MAP reading (which is at 96 kPa with the car off), doesn't really drop down below 60 or so. It's my understanding it should be like 26-30 at idle? Naturally I suspected a vacuum leak, but I can't find one. Using carb cleaner, I've sprayed my vacuum lines, where those lines connect, as well as around the map sensor and get no change. I'm just not sure where else to go at this point.
Side note, probably related, using the stock TB I have to set my ETC Scaler up to like 7000 to get it to idle, and my spark is around -3* or so, which I take it my overspeed table is pulling timing to get idle down to around idle command. I assume this is a consequence of improper MAP reading? Is there a chance my MAP sensor is bad, even though I get a correct reading with the car off (96kPa), and it does change with the car running? Could it be something in my tune? Any advice at all? I'm stuck, and not sure what to do.
Attached is a latest log (warm idle) and the tune I'm running.
Thanks in advance!
EDIT: Also, ignore the AFR reading in my log. I think something is wrong with my 30-4110, or how I have it setup or something. That should be unrelated, though.