Official Thread for posting daily FE updates

[krousdb]

Last week I only drove the Del Sol to work 3 times. I needed the Prius the other two times because I had to carry extra passengers. The morning drives were in the upper sixties and the drives home were in the low sixties.

Just for kicks this morning I yanked the chipped ecu and dropped the stock one back in. Then I drove about 60 miles on errands and a visit to the in laws and then back home. I noticed a few things.....

The injector pulse width after a cold start was higher then I ever remember seeing it, 9.4 ms. I don't ever remember seeing it hit 8 ms with the chipped ecu. This tells me that the ect compensation on the chipped ecu is definately working, limiting the pulse width to below 8ms.

The second thing I noticed was no pinging! The chipped ecu needs the ignition advance backed off.

And the last thing I noticed was that the fuel cutoff when the throttle position is near closed is much more prononced. As I ease off the throttle, the injector pulse width drops to about 1.8 then to zero. With the chipped ecu the pulse width gets down to 1.2-1.4 ms before dropping to zero. This suggests that the reduced fuel values in the chipped ecu fuel map are also working as advertized.

What remains to be seen is whether or not a leaner AFR yields better FE. My trip FE today was about 65MPG, about what I would have expected. I will leave the stock ecu installed for tomorrow's commute to see how it compares to previous "chipped" commutes. Tomorrow will be my last commute for this tank, currently at 280 miles, 65.1 MPG.