Over the x-mas break, I rebuilt the spare 700r4. Got that put in and noticed a much better running drive train it seems. All the tuning I've done up to that point seemed to be no good anymore.
The setup is as follows, a 3.4l engine with a 4.3 throttle body, edelbrock long tube headers and a 1228062 ECM. (I'm using that ECM because it being more simple for me. I might later swap to the 7747 when I get a better understanding of everything going on.)
So, I had to take care of a sticky throttle valve issue when I go WOT by using a transgo tv kit. I've got the tranny back together and took it for a test drive and recorded some logs. Right off the bat, I see my knocks have skyrocketed and have no idea why other than I believe that the TCC lockup has a lot to do with it.
The TCC was originally controlled by a vacuum switch, but is now controlled by the ECM.
But lets back up a little to the tuning of the spark and ve tables first.
We are running E10 here and who knows what the ethanol mixture actually is. I've got the Stoich AFR set in the BIN for 14.1 as once suggested by Mark. I need to change the AFR gauge to Lambda value display.
But where I am confused is the Stoich setting in the BIN. For example, if the logs show that you are running lean because the stoich value is 14.7 for e10, then would setting the value to 14.1 essentially be the same as a global adjustment on the VE table to richen the readings?
This is confusing the poo out of me and I don't know why unless I am thinking too much about it.
Based on AEM's manual on the wide band sensor, it discusses that the factory o2 will typically show a rich indication for a Lambda value of less than one.
In this case, with straight gasoline and the stoich set at 14.7, I should see 128 for a perfect burn, but with E10, I think I would be seeing BLM values lower than 128 meaning the ECM is adding fuel to compensate for fuel that requires a higher mixture.
What BLM values would I see if I set the Stoich value in the BIN to 14.1?
Will the narrow band o2 sensor then report rich?
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