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open loop?

 
Old Aug 25, 2011, 10:43 PM
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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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Old Aug 26, 2011, 06:01 AM
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Either closed loop was disabled via periphery bits or the open loop load & throttle tables were changed so that the thresholds for open loop are always met.
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Old Aug 26, 2011, 11:34 AM
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Have you asked your tuner what method he used to enable full time open loop?
Like Raptord said those are the 2 methods used...post up a screenshot of those tables.
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Old Aug 26, 2011, 12:26 PM
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tuner seemed way to busy to try and help, but I was very happy with the flash itself. After looking, it was the bit that was set to not allow in open loop
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Old Aug 26, 2011, 12:49 PM
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*closed loop... while i am on the subject does anyone have a screen shot of what a forced open loop map would look like?
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Old Aug 26, 2011, 01:02 PM
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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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Old Aug 28, 2011, 12:32 AM
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Noob Here ...
Just wanna ask ....
Which is better ... Closed Loop or Open Loop boost control is better ?
Pls explain in details ...
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Old Aug 28, 2011, 07:49 AM
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Originally Posted by boonkae View Post
Noob Here ...
Just wanna ask ....
Which is better ... Closed Loop or Open Loop boost control is better ?
Pls explain in details ...
The question doesn't really make sense. Boost control starts at a certain load level, as determined by the "Min load for boost control" table. Being in open or closed loop doesn't change anything.
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Old Aug 28, 2011, 08:05 AM
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Originally Posted by Raptord View Post
The question doesn't really make sense. Boost control starts at a certain load level, as determined by the "Min load for boost control" table. Being in open or closed loop doesn't change anything.
But from what i heard .. closed loop control is more accurate & faster ...
Not sure its real or not ... hence i'm asking which is better ...
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Old Aug 28, 2011, 08:58 AM
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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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Old Aug 28, 2011, 04:36 PM
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Thanks for the explanation ecktt ...
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