My 2001 Insight had all of the recalls done in ~2008 and had the 070MCM/A01BCM, as well as the 37820-PHM-506 version of the ECU/ECM when I got it last August. I have slowly replaced the BCM/MCM to revert to the original versions as I documented in this thread
in an effort to maximize MPGs without using the MIMA system. I have peacked in the high 80's to low 90's MPGs while driving on flat open highways at ~45 MPH and that, I thought, was the best I was going to get . . .
The 2000 Insight that I recently bought from Oregon and am fixing up to sell to a relative had no recalls done, and had the original 030MCM/010BCM (which Eli now has
). Interestingly, it also had the 37820-PHM-505 version of the ECU/ECM.
Since I am in good with my Honda parts guys and they will chip keys for me free, I figured what the heck and tossed the 505 ECU into my 2001.
I was, and still am, shocked at the result. I got an immediate 8-12 MPG improvement at all speeds!
I am now able to drive 55MPH and get mid 90's MPG on my 'flat' commute. Before I had to run a 45MPH target speed (and less on hills) in order to break into the 90+ MPG range. I have never been able to run low 90's MPGs during my normal commute without going VERY slow, and mid/high 90's required the full tank "bump" to achieve.
This was driving home on the 'flat' route at a 55MPH average. This is easily my best MPG ever on this late night run, AND I was going approx 10 MPH faster than normal:
I haven't been able to do a normal 'hilly' route test run (at ~45MPH) where I get my best MPGs, but was able to slow to ~45MPG for a few miles on the 'flat route' during my drive in to work a couple days ago and got this:
I have *never*
been over 100 MPG for this type of distance, let alone close to 110!
I've been driving on this ECU for three days now and am still amazed at the increase in #s I am getting. I am seeing this significant improvement at all times and all speeds, regardless of terrain or gear. I am not sure exactly why this jump has occured, but I have noticed that the car will go into lean burn faster/easier, auto stop happens sooner and more often, and purge cycles are much less frequent, but those don't add up to this increase by themselves. There is no difference in power or acceleration, and nothing else on the car has changed. I have intentionally been driving on less then 1/2 tank to ensure the "fill up bump" is not skewing my numbers.
I should be able to get three full test runs next week and will be sure to post those results, but this was too shocking for me to wait anymore.
Needless to say, my relative is not getting this ECU back