Syvecs Forums

Is is possible to view the long term fuel and ignition trims? My reason for asking (and I may be completely wrong on this) is that it could be a good way to make adjustments to the base fuel and ignition maps based on the corrections that the ECU is doing.

From a learning perspective, it would also be interesting to see how much work the ECU is having to do in order to reach a given lambda target.

I realize that some of this can be seen with data logging but was just wondering if it ends up in a map somewhere that's viewable.

Recorded fuel trims over time as a fuel correction map to match/overlay on the main fuel table is a very good feature that many aftermarket ecu's offer these days.

Strangely Syvecs do not. I did ask about it years ago myself.

Using logging and fuel closed loop adjustment multiplier is the closest to what you seek.

Thanks Stevie.

Me personally I would find that 'feature' crap.

It's just way too easy to do a log and obtain the data you need, and I must stress, extreme vetting (trumpism lol) to sort the shit from the clay.
I'll give you an example:
IF your act multiplier is out (which it is on most cars) then you have a case where you will have lets say a +- 3% variation to do with this correction, so what does this then do to your long term fuel trim table that gets populated over time? what do you believe or use? its far easier to combine an experienced operator to do the filtering and simply extract the valid information you need and apply it.

example below of a air charge temp correction being wrong, see effect on lambda correction.


It is very easy and quick to set up a fuel table with the tools available and they are really good, no need for anything else honestly, the best thing is I have control over what is valid and what is rubbish, and that makes the process quick and accurate.