open loop?
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open loop?
Is there anyway to switch in between open and closed loop? When on the dyno I found that the front o2 sensor was bad so the tuner said he locked it into open loop. Cannot find a way to get back into closed loop. The front o2 was dragging the afs down to 10.1-5 on idle and cruise.
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Should look the same. Its basically just targeting 14.7 under the load threshold. Look at your Open Loop Load tables. Anything under that load and at that RPM is closed loop. Then compare to your fuel map. Should be 14.7 below those load cells, maybe close to it at the transition points.
Last edited by charlie.tunah; Aug 26, 2011 at 01:05 PM.
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Not sure its real or not ... hence i'm asking which is better ...
#10
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Closed loop uses the Narrow Band Lamda sensor feed-back (hence the name) to control fuel trims while cursing (low loads-out of boost), to keep the Air Fuel Ratio as close to 14.7 as possible. The Narrow band sensor can only tell if the AFR is at 14.7, leaner or richer. On a stock rom, when boost comes in, the ECU switches to Open loop which has no feed-back (hence the name). Open loop basically uses what injector calibration it has from closed loop and the fuel map to control AFRs.
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