Technical Problem, JRSC 2015 BRZ
 

Ive got a question, I've tried to figure this out but i can't. My car ran good for about 5-6 months but all of a sudden started acting weird.
-Runs a little rich(13.4) on cruise
-Spikes too lean on WOT thus not delivering power
-on e85, does NOT turn on unless i baby it until it stays on
-on e85, runs way too lean on WOT and then corrects itself when rmps go past 3200.

what i have on it is
-Jackson Racing C38 supercharger
-JR dual radiator-oil cooler
-Crawford AOS
-Delicious Tuning Flex Fuel
-UEL header with Full Bolt ons
-DWs 300 Pump
-DWs 700cc Injectors
-Delicious MAP sensor

tried disassembling and reassembling fuel pump but still nothing
SOMEBODY PLEASE HELP :cry:

bad primary o2 sensor and/or exhaust leak.

I can figure this out by checking the o2 sensor on live datalog to see if it flickers right? if it doesnt flicker(digit changing) then its a dead o2 sensor right?

I had similar symptoms of the car all of a sudden running lean on e85. My fuel trims went extremely positive trying to compensate and eventually threw a lean code. I have similar mods as you: JRSC, DT flex fuel kit, DW injectors and DW Map sensor. I initially thought it was an exhaust or intake leak somewhere but that checked out okay. I ended up sending an idle log to zach@delicioustuning and he determined my ethanol content analyzer (black box) had gone bad. We replaced it and we were good to go again. I would look into that as it's a pretty easy thing to rule out. Good luck!

thank you! im going to try that