COS5 Turbo Questions

[5.7ute]

If you use lean cruisemode with a COS you need to match your PE map trigger to the enrichened cells in B3647. For example, if you command stoich up to 80kpa, then progressively enrichen the cells up to 105kpa, you need PE the map enabler to trigger from 80kpa. Also the TP position enabler will need to be set just above your usual cruise position. This is the only work around I have found to prevent a "rich cruise mode" Which will occur if the cruise timer is hit during an uphill climb.

[ferocity02]

If you use lean cruisemode with a COS you need to match your PE map trigger to the enrichened cells in B3647. For example, if you command stoich up to 80kpa, then progressively enrichen the cells up to 105kpa, you need PE the map enabler to trigger from 80kpa. Also the TP position enabler will need to be set just above your usual cruise position. This is the only work around I have found to prevent a "rich cruise mode" Which will occur if the cruise timer is hit during an uphill climb.

Using your example of enriching after 80kPa in B3647, what about just setting PE MAP trigger to 105 kPa?

[5.7ute]

Using your example of enriching after 80kPa in B3647, what about just setting PE MAP trigger to 105 kPa?

In the example I stated, that is what is necessary if using the lean cruise patch. If you are not using this patch, enrichen B3647 as you would for an N/A application, trigger PE at 105 kpa & place your boost enrichment values in the commanded fuel in PE table. You can lean out the cruise areas of B3647 for an easy lean cruise setup.
PS sorry for the late reply but we are swamped here at the moment.

[ferocity02]

I have my B3647 set to 0.99 everywhere except for the higher MAP columns. But once it gets into idle mode at zero VSS and zero TP the GM.EQUIVRATIO goes to 1.00. Can this be adjusted? If so where?

If EQR is 1.00 at idle but 0.99 in B3647, will it go into semi-open loop?

[joecar]

If wideband AFR is tightly oscillating around stoich then SOL is active, see below pic AFR_WB waveform:

[ferocity02]

Hmm, mine doesn't look nice like that, but it's definitely oscillating.

Why is the idle EQR 1.00 when B3647 is commanding 0.99?

Here's a log from today.

[darcy]

Why is the idle EQR 1.00 when B3647 is commanding 0.99?

Try setting B4101 to B4104 to 0, to stop it entering closed loop idle.

[ferocity02]

Try setting B4101 to B4104 to 0, to stop it entering closed loop idle.

Thanks, I'll give that a shot.