[open loop fuel control]

Different calibrations may use slightly different algorithms so you may need to try different things.

[open loop fuel control]

So, to get open loop at idle or during deceleration, with no accel pedal input, you need to adjust load for open loop during deceleration table that I posted previously. This is a correction to what I said previously.

If you just want open loop all the time and don’t want to tweak when it transitions, one easy way is to adjust the time delay for closed loop below:

Just set the right side to 10 x 60 x 60=36000 for 10 hours and you will always be in open loop. I’m sorry I don’t know how/where these tables are labeled/located in your software.

[open loop fuel control]

Yes, exactly

[open loop fuel control]

Car will transition to open loop when the throttle counts exceed the value at that RPM. So you could be tooling around in first gear revving your motor at 6000 RPM say at 30 or 40 MPH with very little accelerator input and have only a small throttle angle, if it is less than 100 counts it will fuel at lambda, in closed loop.

since WOT is at 590, you will always be open loop at WOT at any RPM in the above tables ‘cause transition count are always less than 590 in the above tables.

 

 

[open loop fuel control]

There is also the table for open loop decel.

car will decel in open loop if the load is LESS than table value

[open loop fuel control]

Yes, PCM will run off the open loop fuel table when warm, in that situation. I have done that many times. PCM continues to receive and act on ECT and IAT. It often uses a weighted average of these two temps in it’s warmup tables.

 

[open loop fuel control]

23 hours ago, Roland@pcmtec said:

Are you sure? I've ever actually tested it at idle. 

Well, in my Aston that’s how I run open loop at idle and I let it run closed loop above that until 3800. In my application idle is more even In open loop, it hunts in closed loop for some reason. Can’t guarantee it works in the Aussie code but looks very similar in IDA Pro

[open loop fuel control]

On 8/19/2019 at 9:08 AM, Andrew said:

Hey everyone. Related question - if I set the values in this table to zero, does this force open loop at idle?

Yes