TheDarkSideOfWill wrote:
I'm going to pirate that stamp and make very good use of it.
GM has solved this problem in production computers since the 1980's... What's wrong with MoTeC that they can't figure this out?
GM has parallel conditions set. MAP/MAF is the primary load indicator for most operating conditions, BUT when the throttle goes beyond a certain percentage (and there's a table so that this % can vary with RPM) the controller enters "power enrichment" (PE) mode. This means that closed loop fuel trim updates are disabled (the trims are still used in the fueling calculation), commanded AFR goes from stoich to the PE AFR, ignition timing tables are adjusted, etc.
It boggles my mind that most aftermarket computers don't have this. I read a topic on the Megasquirt forum a while back in which someone was asking for a system action analagous to PE mode, and no one had any clue what he was talking about.
That one of my favorites

Motec lets you use a secondary table for mixture so you can correct that for the correct load regardless of baro when using MAP or MAF load sensing.....but TPS load sensing solves the problem other than making tuning a bit harder.
In the past I've used TPS load then plug the the baro input that is needs for mixture correction into a MAP to get WAY more sensitivity at low power and the new motec recommends that so I know they know the right answer....but MAP tuning is easier and most people will never understand why it's wrong.
They could have done MAP/Baro to get load but too much thinking I guess.
MS does somehting weird. If you don't add the baro sensor it goes way lean driving up a mountain and they all thing thats normal. but it you stop and reset the mixture becomes normal again. The only thing I can thing is they sample baro at startup and are doing a MAP/baro thing somewhere in the math....so adding a real baro fixes the issue. So they might already have a stable load calc. Just guessing though.