The "let's brainstorm how to make a piggyback work" thread - Toyota Yaris Forums

eTiMaGo · 03-29-2009, 01:09 PM

LOF, I posted a second excel file just before your post with more spirited acceleration, Open Loop seems to kick in at 75% throttle and above, though this should require some more testing

I'm not sure you can get injector info off the OBD bus?

But what do you think of that URF AF sensor device I posted earlier? By tweaking the response from the sensor it would have the ability to affect the short term fuel trim and thus richen it up a little as needed. I'm just not sure how the rear O2 sensor will react to that and cause trouble...

largeorangefont · 03-29-2009, 01:23 PM

Quote:

Originally Posted by eTiMaGo

LOF, I posted a second excel file just before your post with more spirited acceleration, Open Loop seems to kick in at 75% throttle and above, though this should require some more testing

I'm not sure you can get injector info off the OBD bus?

But what do you think of that URF AF sensor device I posted earlier? By tweaking the response from the sensor it would have the ability to affect the short term fuel trim and thus richen it up a little as needed. I'm just not sure how the rear O2 sensor will react to that and cause trouble...

I saw that log, he is going too slow. We need long WOT pulls in a single gear, like you would do on a dyno.

Injector info is there on the OBD, the software just needs to be able to read it.

The problem with adjusting the fuel trim is that the car will readjust it back. The car can adjust fuel trims around +/- 25% before a CEL is thrown. Like I said, I have never really seen one that truly works. The car is constantly learing around your changes.

The rear 02 does nothing in relation to fueling. It is only there to insure the pre cats are functioning.

03-29-2009, 01:09 PM	#1
eTiMaGo vroom vroom View User's Garage Drives: lil red 5-door Join Date: Sep 2006 Location: Bangkok, Thailand Posts: 7,744	LOF, I posted a second excel file just before your post with more spirited acceleration, Open Loop seems to kick in at 75% throttle and above, though this should require some more testing I'm not sure you can get injector info off the OBD bus? But what do you think of that URF AF sensor device I posted earlier? By tweaking the response from the sensor it would have the ability to affect the short term fuel trim and thus richen it up a little as needed. I'm just not sure how the rear O2 sensor will react to that and cause trouble... __________________ The price of freedom of religion, or of speech, or of the press, is that we must put up with a good deal of rubbish. - Robert Jackson Bye bye 1NZ...