LOL... Oh yeah... Look at that :lol:
Hehehe... [Drumroll]!
Alright - I am now officially running a speed density tune
Using the spreadsheet tool that's up on the Romraider forums, with a couple of tweaks of my own, managed to get a workable (well, actually a pretty decent) SD map to load on and ran it, with a couple of iterations and edits today.
I left closed loop switched on (Cobb also recommends doing this) as it leaves you with a bit of a safety net in terms of heat soak with the IAT in the cold air intake. Zeroed the load compensation table completely (which I am loath to do, as I have major resonance issues) and ran it. Open loop is
remarkably close in terms of tracking the fueling tables.
Closed loop is going to need a
lot of attention. Trims are quite erratic - although I believe that also has to do with the zeroed load comp tables. My thinking is that the VE map is in a better position to deal with resonance, given that it is using the same input parameters as the problem - RPMs and MAP. And you can see it in the map as well - the areas where the load comp tables previously compensated have similar patterns. I'll make up my mind as I go along as to whether I revert to using the load comp tables strongly or only to smooth things out.
Idle was actually relatively stable, although there is a specific situation where I managed to get it to basically create a circular feedback loop - it swung from -7 to 7 and so on corrections. High IAT after heat soak, and a tap to accelerator and letting go (creating a peak, and then a trough). My gut feel is that the latencies are
still not right. I'm running 1.05ms now, as opposed to 1ms which is the advertised deadtime at 14V. Looks like I'm going to have to test different values - but I'm thinking that the pulsing (which I can see in the AFR's on the wideband swinging wildly) is likely due to the injectors being slower than the advertised rate. We'll see. Frankly, I wish I had some input from other people running 1200cc five-O injectors... If any of the mechanics on here have encountered them, would greatly appreciate feedback.
Once I have a relatively stable VE map, which I need to make sure is done at a relatively similar atmospheric temprature (it's been
damn hot lately...), I will need to proceed to the g/s vs IAT compensation tables.
This is going to be a lot of work - but I suspect worth it.