I’m new-ish to the ECUMaster community, I’ve had a EMU-Pro 8 running in car for a few weeks now, and am starting to get a decent driving tune in the car. I have some questions about the trims. Short term seems to be doing a good job of helping a bad fuel map feel like a decent fuel map. But I have no idea how to use the long term stuff. I had it active for a short drive and then found that I was unable to use the VEtuner tool on all of that logged data, but also couldn’t find an offset table or way to apply the long term trim info. I know there are documents that have been released that go along with the manual. Is there something like this available for this feature?
welcome to the Ecumaster world! I hope you will enjoy it.
The idea of Long term trim is to gather corrections from Short term trim in a longer time period. Afterwards you can apply these corrections to the VE table.
At first, you need to enable it in Fuel / Long term trim section. Under Activation group you can configure conditions when the LTFT would be active. Gain defines how fast the STFT corrections are applied to the LTFT. Keep in mind that too high value would fill the Long term trim table quickly, but the correction may not be accurate.
To show the Long term trim table, you need to add a new panel (by right clicking on existing panel or just F9 key), search for “long term” and choose the “Fuel Long term trim”. These data are stored in ECU only, so you need to be connected to the EMU PRO.
First button with a blue arrow will download the table data from ECU. The red cross will clear it, the third button with a white arrow will transfer all long term trim corrections to the VE table.
The VE Tuner does not use Long term trim values, it calculates the corrections from lambda values. If Short term trim is enabled, it takes these values too. VE Tuner takes data from the log, so you can use this tool offline as well.
VE Tuner is described in this document, perhaps you have seen it already.
My experience has been great so far! I’m very impressed with the hardware at this point and look forward to putting it through it’s paces.
Thank you for the detailed reply! That should get me up and going quickly. This afternoon I went for my first drive that wasn’t a mile or so from home. It included about 20 miles of freeway driving, so very steady rpm and load for a long time. I was hoping to see short term trim doing work but noticed that it was disabled because of “response delay (-12)”. My setup is TPS based rather than MAP. Is the delay something that noise in the TPS signal might cause? Mine was looking a bit noisier than it did with my previous ECU, but I may have had some filtering in use to smooth things out in the past. Would filtering potentially help me get out of that forever state of response delay? I assume that if short term trim is disabled, then long term is also disabled too, right?
Blocked: Recovery delay (-12) is a state when it waits a specified time (Recovery delay in Activation section) after some event when the Activation settings are not meet. Check what state is set just before the recovery delay, perhaps the RPM value is noisy and RPM rate is very high, then increasing “Engine RPM rate max” value should help. Noise in TPS signal may interfere too, as it is used for a Efficiency load and its rate may also be higher than specified max.
If short term trim is disabled, then long term trim does not have input data to update its table. However, if you turn off short term trim when long term trim table has non-zero values, the correction would be applied, but the table would not be updated.
Is it possible to apply a software filter or smooth the TPS signal? I’m probably looking at what I need to adjust, I just don’t know the ECU Master lingo yet. I thought I had made some adjustments that would help, but as soon as I get the car on the interstate, Short term throws the recovery delay code at me again until I slow back down. Not sure if I’m seeing road vibration echoing through my foot and down into the throttle cable, or what, but its not providing a pretty and smooth line on the datalog.
There is no smoothing for the TPS signal. Are you sure it is a matter of noise? Perhaps the throttle has oscillations. If so, DBW calibration might be wrong. There is also “Filter strength” there. Did you use DBW tuner tool?
No DBW on this install. Old fashioned cable and 65 year old pedal assembly. I’m wondering if I’m seeing road and chassis vibration translated through my foot into the pedal.
We will add TPS filtering to our TODO list, also we would like to improve calculation of RPM rate. For now you need to increase max rate for RPM or load in short term Activation section as it is.
To understand what is the cause of recovery delay you need to set higher logging frequency for the Short term trim State 1 channel. You can do it in 2 ways: right click on a channel and “Set log frequency” or in Logged Channels panel. I suggest to set it to 500 Hz to see every single state. Then you would be able to find out which rate should be increased. The value of rate you can read from RPM rate and Efficiency load rate channels, they would need also higher logging frequency. I would start with a load rate.
