ECU reaction with VAFC?
09-26-2006, 10:07 AM
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ECU reaction with VAFC?
Rumour has it that the ECU compensates with VAFC values.....
Is there any truth to that?
I'm assuming it would ot the same on a greddy emanage too then?
Is there any truth to that?
I'm assuming it would ot the same on a greddy emanage too then?
09-26-2006, 12:36 PM
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That's just about right. At part throttle, the ecu reads all the signals, including the O2 sensors, and adjusts the fuel tables based on the parameters. The Vafc on really adjusts what the ecu sees as airflow, so over time the O2 sensors will bring the settings back into line with what it expects. You could constantly reset the ecu, but they run really poor after that for a time while they relearn.
When the ECU goes to WOT, it stops reading the O2 sensors and goes into what they call open loop mode. If you only set the Vafc to modify the fuel at WOT, then the tune will stay. It's a good piece for the money. You can modify the VTEC point, and pick up some good hp at WOT. It does have to be tuned on a dyno to get the right settings. For $250 + tuning, what else will give you 10RWHP? That being said, it cant modify settings for cruise, idle, etc...
It also can't modify timing, so it has it limits. An AEM EMS is a more capable solution, but it starts at $1300 plus tuning.
When the ECU goes to WOT, it stops reading the O2 sensors and goes into what they call open loop mode. If you only set the Vafc to modify the fuel at WOT, then the tune will stay. It's a good piece for the money. You can modify the VTEC point, and pick up some good hp at WOT. It does have to be tuned on a dyno to get the right settings. For $250 + tuning, what else will give you 10RWHP? That being said, it cant modify settings for cruise, idle, etc...
It also can't modify timing, so it has it limits. An AEM EMS is a more capable solution, but it starts at $1300 plus tuning.
09-26-2006, 01:06 PM
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Originally Posted by blackey,Sep 26 2006, 12:36 PM
That's just about right. At part throttle, the ecu reads all the signals, including the O2 sensors, and adjusts the fuel tables based on the parameters. The Vafc on really adjusts what the ecu sees as airflow, so over time the O2 sensors will bring the settings back into line with what it expects. You could constantly reset the ecu, but they run really poor after that for a time while they relearn.
When the ECU goes to WOT, it stops reading the O2 sensors and goes into what they call open loop mode. If you only set the Vafc to modify the fuel at WOT, then the tune will stay. It's a good piece for the money. You can modify the VTEC point, and pick up some good hp at WOT. It does have to be tuned on a dyno to get the right settings. For $250 + tuning, what else will give you 10RWHP? That being said, it cant modify settings for cruise, idle, etc...
It also can't modify timing, so it has it limits. An AEM EMS is a more capable solution, but it starts at $1300 plus tuning.
When the ECU goes to WOT, it stops reading the O2 sensors and goes into what they call open loop mode. If you only set the Vafc to modify the fuel at WOT, then the tune will stay. It's a good piece for the money. You can modify the VTEC point, and pick up some good hp at WOT. It does have to be tuned on a dyno to get the right settings. For $250 + tuning, what else will give you 10RWHP? That being said, it cant modify settings for cruise, idle, etc...
It also can't modify timing, so it has it limits. An AEM EMS is a more capable solution, but it starts at $1300 plus tuning.
09-26-2006, 01:42 PM
#6
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i love my vafc and recently adjusted my setting to only apply at WOT, the car runs basically the same and i dont have to reset my ecu every two weeks. the dyno numbers in my sig are off my re-tuned vafc.
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09-26-2006, 01:51 PM
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Originally Posted by AssassinJN,Sep 26 2006, 11:06 AM
This is true on all "biggy-back" style computers. You should reset the ecu every week or so seams to be the consensus.
09-26-2006, 03:26 PM
#10
Originally Posted by djpeak10,Sep 26 2006, 03:51 PM
what about a vortech black box piggy back computer, are you saying for optimal performance I need to reset the computer every couple of weeks?