Acceleration Wizard

pope · Post by **pope** » Wed Jul 26, 2006 10:56 am

MegaSquirtII v3 board 2.25 software. on a Ford 302.

What are people using for acceleration settings?

...and...

Is there any way to make the accel. enrichment apply faster?

In regards to my first question, I've got settings worked out that are working alright, I've still got a slight stumble but otherwise I've gotten it pretty smooth, however, my enrichments are rather low numbers compared to what they were default, and I'm just curious if this is normal.

My second question pertains to the slight stumble. Looking at the data log, the accel enrichment "light" comes on, the AFR Spikes lean, and then drops slightly rich until the accel "light" goes off. (I'm using MegaLog Viewer's latest version) It is my belief that the lean spike is causing the stumble, but how do I get rid of it? If I increase the accel enrichments more, I still get a lean spike, but then the engine goes over rich and bogs until the accel enrichment turns off.

mops · Post by **mops** » Wed Jul 26, 2006 2:03 pm

accel enrich should be set purely by 'feel'. no values are strange. it depends on very many factors, so if it feels good then it's good

you might find that freereeving might feel good, but once you are actually driving in gear and stab it then it will stumble/jerk....

re datalog....
datalog values are not 100% synchronized with each other. if you are comparing entries that are 0.1s away from each other, bear in mind that that one or more can be delayed. furthermore AFR readings are sensor/controller dependent, and are known to overshoot/delay/etc. not to menioni that rich misfire will read lean on the sensor, etc...

so i think you are making good progress ;)