What sort of time frame/load? Any logs of the lean/rich spikes? Have found similar quick throttle opens under no load to give a rich blip followed immediately by a lean blip then of course back to L=1.
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OS 12212156/LS1
I know this is a GENIV thread but I figured the dynamics stuff works the same. :hihi:
The thing I worry about is if I change impact or evap what will this do to MAF/VE?
LTFTs and WOT are good I don't want to change impact and/or evap then have to mess w/VE and/or MAF. :sly:
OK, here's a few images of the dynamic overshoot....
Commanded AFR remains at stoich.
This was a take off from a stand still and shows the shifting up through the gears. The rich spike on throttle close is causing a subsequent lean spike on the next throttle opening.
http://farm3.static.flickr.com/2047/...02b90a0b_o.jpg
Commanded AFR tranition to / from PE
This shows the transition to / from PE with throttle change. Again this was a take off and shows the overshoot getting worse.
http://farm3.static.flickr.com/2379/...2b93d651_o.jpg
Throttle Blip
This shows the results with throttle blips. Blips will always cause issues due to the rapid change in engine conditions.
http://farm5.static.flickr.com/4034/...36ed8432_o.jpg
Simon.
How is the intake valve temp measured?
Can it be calculated based off ECT?
All the dynamics stuff for GENIII are based off ECT.
This was an interesting read.... now 6 years later are the findings/theories still the same for modifying dynamics?
Also more than a vested interest since I have a SD maffless tune which "feels" better in OL rather than CL.....and am noticing some of the observations within this thread. Has a path been found for getting transients working without MAF ?
I know this is an old thread but would like your thoughts on my LS3 e38 setup. Texas Speed cam 229/236 .629/.615 112 LSA, Hi-Ram intake stock injectors 90mmTB. As you can see I have a dual air intake which makes a maf sensor impossible.
To me it shifts great and pulls great, except concerned wbo2 reads rich all the time (11.7-12.4). Only issue is not returning to idle, it hangs longer than it should and sometimes won't come down at all.
Appreciate it if you have the time.
Hymey, Thanks...I have read both several times but have trouble with the airflow/spark relations, so many tables. Its a lot to take in but I do get more after rereading but I guess it takes time. Without a background in air/fuel/spark relations, it is a big learning curve.