Power Enrichment OBDI

[LZeppelin513]

Edit: in the title I said power enrichment but I meant accel enrichment...

During accel enrichment I go way lean at first and then way rich.

I increased the first few values in the "AE mults vs D-TPS table" but it didnt seem to have the effect I was hoping for.

I am thinking I need to tune "AE mult VS AE pulse" but I dont fully understand the table and my guess and check is not paying off. Basically, what do the "pulses" 1-8 represent?

I have been changing "AE mult VS Coolant temp" for global changes and that seems to be working as intended.

And just to double check, decreasing the values for Decel enleanment willdecrease fuel correct?

[robertisaar]

pulses refers to the AE pulses that happen. AE pulses are done via async pulses, so they happen between normal synchronized pulses(that are timed to the rotation of the engine).

making the value larger means a larger shot of fuel, which BTW the shot is based off of the sync BPW, so if that's off, it messes with AE fueling as well.

if AE fueling is determined to be needed after 8 pulses, it just uses the pulse #8 value.

[LZeppelin513]

OK I don't think I follow. The pulses happen independent from normal IPW? And it sounds like they happen at a (fixed?) interval independent from engine rotation? If so what is the interval?

[robertisaar]

AE/async pulses happen after a normal sync pulse finishes. sync pulses are timed to specifically happen based on engine rotation/position.

it's easy to see if you have an oscilliscope, but otherwise, really difficult to track.

[LZeppelin513]

Ok that makes sense.
I'm still not sure how to fix my ae problem. When I go wot, regardless of rpm, about four samples after 100 % tps is achieved I go pig rich. Ae DURRING tps change is good. It's the 4 samples or so after that go rich. Does ae run on after d tps stops?

[robertisaar]

there are 2 scalars in the calibration, 1 for "D-TPS required to enter AE" and 1 for "D-TPS to remain in AE". if you enter AE and D-TPS doesn't stay above the remain threshold, AE fuel quits being injected.

does the engine act the way the wideband is implying it to act? rich bog for ~.4 seconds or so after the throttle quits moving?

[LZeppelin513]

It does seem to act like it bogs a touch where it shows rich but I cant say for certain.

How often does the computer change AE fuel injected based on D-TPS? If it is every 12.5 ms I dont see how you could tune that table since it is so much beyond the resolution of our data log.

I have an LX5 TB. I was wondering if it may have to do with the larger TB. For instance a large d-tps from 5% will need a LOT more AE than from say 70%. And that will be exaggerated as TB size increases. I am not sure what I would do to compensate for that.

[robertisaar]

80Hz loop, so yes, 12.5mS. basically have to tune it based on feel, rather than sensors.

if you have an emulator/AutoPROM or are able to switch calibrations, do back-to-back tests and you should be able to feel a difference if you move ~10% at a time. since you seem to head toward rich first, try leaning the AE vs pulse table by 10% (multiply all values by .9) and see if it helps.

[LZeppelin513]

OK thanks. What do you mean heading towards rich first, during initial AE I am on the lean side and then fall rich at the very end (actually after AE should be doing anything)

[robertisaar]

reading > me.

i guess go richer then?

also, your observance about opening the throttle at 5% compared to 70%: such is A1..... there is no D-MAP requirement/adjustment like there is in certain masks.

[LZeppelin513]

Is there a way to disable AE above a given throttle position?

[robertisaar]

nope.

you can see why i modify the crap out of existing code?

[LZeppelin513]

does PE disable AE? Im guessing no

[robertisaar]

correct.

[LZeppelin513]

Does D-TPS = "new TPS" - "old TPS" OR ("new TPS" - "old TPS")/"old TPS"

I would think the latter but I want to make sure.