Originally Posted by
Ben Charles
This is my opinion, but the LS9 used a Separate Baro sensor and an actual 3 bar Map sensor. From what I can tell the LT4 C7 Z06 just uses "NA-MAP-Baro" sensor where the LT1 uses a "NA-MAP-TIAP" sensor. IF running a PD blower like you I would try to use the LT4 Map and set it up in the tune for it. Possibly the code bypass what it sees at the MAF sensor baro reading and goes off the actual LT4 map senor?? ($25 from GM)
Tick, if you seeing 121 I'm sure that's just an error on the reported reading, no reason for that to change. But like James mentioned that will throw off the (Map/Baro) pressure ratio.
I'm not able to look at you file (my beta ran out a couple of days ago and waiting for Bill to flash it back on my page) but you need to alter DD tables in the entire throttle percent, not just 100% rolls, that will make a big change. Also have you noticed it shifts very sluggish in SD mode? The Tq coefficient tables need to be increased, this will help quite a bit.