You guys realize that you can't just go around switching around ECUs in 2005 Corollas. They have the passive anti-theft keys programmed into the ECU. If you swap the ECU and don't have the dealer reasign the keys to the new ECU, THE CAR WILL NOT RUN. Also, I don't know if Denso ECUs and Delco units are interchangable without dealer help.
Another thing, the sticker EPA mileage is always over-inflated. To obtain this figure, they drive at 55 with no air in a closed enviroment with no crosswinds or headwinds. Drive in medium to heavy winds or above 55, or with air, and you probably won't achieve even near the EPA figure. My Dad gets 38 MPG highway driving my '05 LE Auto, but other people I know get 32 MPG, and 25 MPG highway. I have a Denso ECU. My car was built in March of 2005.
The intention is not necessarily to swap the ECU ourselves. However, if we find a trend that people with auto transmissions and Delco ECUs get really bad mileage, then we may have the basis to ask the dealer to change it under warranty.
And yes, I understand that EPA mileage is a test that is good for comparing cars to each other, but may not represent the mileage that you get in real life. In fact, the EPA already applies a fudge factor of -10% city/-22% highway to better represent real world numbers. However, it seems that this may not be enough to represent some American drivers!
You said yourself that your 05 auto Denso gets 38mpg highway (which is actually EPA), while others get 32 or 25. What we are doing is a like a 'case-control study' if you are familiar with the types of medical trials
. Basically, if a group of people gets good mileage (mid to high 30s), while another group gets bad mileage, what are the differences in their past that may have caused this? (ECU?)
Edited by bleo, 12 March 2006 - 06:48 PM.