Sorry was about delayed response.
K so question one: EGT is being measured by a defi sensor tapped into the headers. Please keep in mind that these guages and sensors were present on the vehicle when I bought it. So I haven't been able to trace everything yet but I'm getting there.
Front 02 sensor is tapped into up pipe, rear O2 behind turbo but before the cat.
Rear 02 sensor is connected to an AFR guage but I think somethings off cause it reads a constant 15.1 all the time. So I've removed that from my list of viable info readout. EGT reads between 300 and 400 C at warm idle. Hasnt gone over 800 C under any condition pulling or highwaty/freeway driving. The tool I'm using to monitor and data log is a real time OBDII Bluetooth module and the Torque app until I recieve the opensource tools.
Question 2: Current mods to vehicle are AEM CAI, process west tmic, full exhaust (Tomei EL to Invidia DP followed by HKS the rest of the way out) turbo was replaced with a blouch 18g xtr ball bearing (18 psi). Tune to vehicle is a stage 2.5 by Sunny (this came with the car). Because the vehicle was used I'm unaware of injector size at this point. DW300 series fuel pump, aeromotive FPR, turbo XS knock sensor/light.
I'm finding sensors and modules all over as I work on this thing and though trying to play safe, I'm trying to figure out at this point what is giving me data I can actually believe. Because of this I'm trying to look beyond for any other signs/ info I can get that may suggest leaning as at this point that's my major worry.
Edit: I may have worded it wrong earlier. By stand alone unit in regards to the innovate Motorsports module, I mean that I suspect the sensor, unit and guage are not wired into the ECU, not that it's a standalone ECU. It's a wideband sensor and the front one is an OEM narrow band as far as I know. Is rear 02 directly related to AFR monitoring or is it more of an emissions sensor? Do these ECU's calculate the fuel trims by
Info gathered from both or just the front one?