2 bar tune for Turbo LT1 F-body possible with '93 ECM? DA3

[hotrodf1]

The baro update can happen any time the PCM would normally do a baro update, regardless of 100kpA, but it will happen automatically at 100kpA. You need to disable that.

Is there any way to know when it would be updating the Baro? After tonight I'm not convinced the ECM is going to care, even if it does update. It's still going to just see 54.36. Now when boost is in the equation, what will happen? I have no idea.

But I don't have a way to disable the auto update - at least not that I know of. Unless Tunercats can do it, which I don't have. I've looked a few times, and TunerPro doesn't seem to have a way to change the baro update programming. I'm kinda stumped on this one so far. Thoughts?

How are you retarding your spark?

Just using the standard tables. I charted the 1 bar vs. 2 bar readings out in excel and modified the table that way. Starting with 60kPa, just start pulling timing out. pull more at 70, more still at 80, and so on. All values over 55 in the table will be "boost" (since 55 on the 2 bar MAP is 100 on the 1 bar map), but the ECM doesn't really know, it's just using the tables as designed based on MAP reading.

I had the car running and driving pretty nice tonight on the 2 bar tune. CHanges for tonight were just to max out the cylinder volume, and reduce injector constant to 28 (have 32lb injectors) to richen enough. I'm not exactly sure what other gremlins are waiting for me on this. At least in NA trim, it seems to be just fine. I think by modifying the PW calculation this way, it's compensated for the low baro reading. Can anyone confirm that makes sense?