ECMlink Global fuel wayyy off

[stryker]

The other point I'd like to make is that the fuel global itself isn't very precise. IIRC, In the factory code it's only 8 bits and scaled in a way that makes the normal smaller injectors more accurate but as you get larger the jump from one increment to the next gets bigger and bigger. Tom and Dave @ ECMTuning might have rewritten all that code but the way the calculation process works makes me think they didn't.

That's very interesting, and something I haven't come across before to help explain these discrepancies. Some people are so care free, if they need to enter something irrational to get something to work, they just enter whatever and move on without ever thinking on it again. I can't move on quite as quickly. If something seems suspiciously off, I want to usually understand if a different component is causing an issue, or maybe the fundamental idea I thought had to be 100% perfectly accurate maybe doesn't actually need to be.

I'm not trying to create a mechanical witch hunt, but if something seems off mechanically, my brain starts its flow chart of what the possible reasons could be. I'm dealing with 1220 cc injectors, global wants things closer to 1000cc injectors to make other things align the proper way (airflowperrev/boostest/actual boost/afr est/actual wideband). That is enough of a gap that my curiosity gets triggered. Fuel pressure is being logged and is accurate and behaving properly. Boost leak test is clean. Did I get sent injectors smaller than what was on the flow data sheet by accident, or is it just in the 0 and 1 programming of ecmlink and it's a non-issue? Just nice to get that root cause.

The injectors were purchased with plenty of head room left, so I don't need every last cc, but it's just nice to know when things are working together in a way that's acceptable vs not-acceptable, where there is an outside cause for the anomaly.

Sounds like I may have been putting too much trust into the global needing to be exactly what the calculator says, with no exception allowed. If global can be whatever it needs to be to make other parts of the system pass the check and balance test, so be it, it's just nice to hear that from other guys with more experience.

 

[nice97civic]

You could get a better idea by getting the injectors flow tested. Actual flow might split the difference and get the variance with global suggestion into a tighter tolerance. If you've already gotten them flow tested, then nevermind

 

[stryker]

You could get a better idea by getting the injectors flow tested. Actual flow might split the difference and get the variance with global suggestion into a tighter tolerance. If you've already gotten them flow tested, then nevermind

You're 100% right. Depending if this continues to bug me, that may be what I end up doing out of principle. My luck, they'll come back with basically the same flow sheet that I already have from when they were new. Haha.