raiceboi697

iTrader: (42)

I was wondering, i have read how the ecu can be patched to run on speed density setting and how the codes that get many of us, IE no evap system, the dreaded P300, and the damn rear O2 to say the least, what i wanna know is that if you patch the stock ecu to run on speed density is it the same as if a AEM is in the car? i want to install my AEM but for inspections sake... would i change anything if i wanted to swap it back on?? if someone can help please let me know as i am completly out of my element with this.

logic

iTrader: (2)

You need to do a bit of searching, and a lot of reading. There's already two threads discussing stock-ECU speed density, and a few threads on eliminating emissions-related trouble codes. Some starter links for you:

Stock-ECU tuning basics:
Wiki

Speed density:
https://www.evolutionm.net/forums/ec...t-success.html
https://www.evolutionm.net/forums/ec...irst-test.html

Tephra's modified ROMs (with O2 signal simulation from mrfred):
https://www.evolutionm.net/forums/ec...d-v5-10-a.html

Rear O2 heater simulation patch that evolved into a more general approach:
https://www.evolutionm.net/forums/ec...sim-patch.html

After you've gone through all that, then you'll be in more of a position to ask good questions about what you're having specific problems with.

raiceboi697

iTrader: (42)

I understand the basics. What I'm curious is if a AEM is installed in a car can the edu be patched to run the 3.5 bar sensor and pass emissions. I'm asking as I have read most of these threads and just want to know if this is possiBle