when does the Open Loop kick in in MSP?

[pomidor]

I'm now embarking on changing my fuel map via my SSAFC. I'm watching the wideband and, for starters, and I'm trying to figure out when Closed Loop kicks in. I'm paying attention to when the fuel suddenly leans out (I'm assuming that's when the ECU might be switching to Open Loop) and I see some patterns, but...

....it be nice to know what, exactly (besides my crude observations), causes the ECU to go into Open Loop. Meaning, at what:

- RPM ?
- Throttle position ?
- vacuum/boost level ?
- some temperature reading?
- (have I missed anything?)

... or maybe a combination of some of the above.

Is there like an "ECU goes into Open Loop" map/diagram anyone knows about? If not, anyone's knowledge/experiences in that matter would be much appreciated.

 

[IshSonP5]

I think the car is only in open loop on cold start and WOT. Otherwise closed loop

 

[nicholsspeed]

if you have a SSAFC you set when the car kiks in Via the overpressure setting. im pretty sure most have had best luck setting it at -1. i know thats what mine is set at, so i know that anytime the car is in Boost it is in Closed.

i know there is information on here about this. just search for it.

 

[pomidor]

"over pressure setting"? I haven't seen this setting in the SSAFC's software menu. I'll need to take a closer at the settings.

I did already search for the info I'm asking here. After few hours of reading and not finding an answer, I gave up and made this thread.

 

[pomidor]

I see it in "options>>Output settings".

Anybody know what all the settings and values in that window mean/do?

 

[pomidor]

anyone?

 

[stevew145]

The only one you need to worry about there is setting output b to over pressure, and setting the pressure to -1. All the other things do nothing for our controller.

 

[pomidor]

The only one you need to worry about there is setting output b to over pressure, and setting the pressure to -1. All the other things do nothing for our controller.

Like so? If that's the case, What does "over pressure" actually mean?:

 

[Knox Joe]

Manifold Absolute Pressure. When the MAP is above -1 you are "over pressure" and the SSAFC then controls fueling.

 

[pomidor]

I still don't get it. What does the "over pressure" setting of '-1' make the SSAFC do exactly?

Does '-1' mean vacuum (as in -1 Hg)?

I'm must sound like a complete noob, but although I know what "Manifold Absolute Pressure", I don't understand your explanation.

What does "over" mean in this context?
"over" as in "above/beyond"
"over" as in "finished"

 

[Knox Joe]

Does '-1' mean vacuum (as in -1 Hg)?

Yes.