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jerryherb
Samba Member
Joined: October 30, 2015
Posts: 205
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 Posted: Thu Mar 02, 2017 2:41 pm Post subject: Re: Testing Aux Air Regulator |
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| tencentlife wrote: |
When you find yourself having to argue so elaborately, it's time to step back and apply that complicated little thing called "Ockham's Razor".
Throttle bypass systems are mixture-neutral, they merely route metered air to bypass the throttle and as I've said about five thousand times they have precisely the same effect as opening the throttle slightly to raise idle speed. Period.
Don't teach your grandma to suck eggs is another old saying. |
Challenge accepted. Im in the process of getting an MTX-L to further screw up my AFM  Im familiar with the air routing and am aware that AAR increases airflow of METERED air to increase the idle. Im sure your decades of experience will prove me wrong, but young grasshoppper learns from mistakes and experiments. I will report back once my back is healed from months of bending over the back of the rusty bus |
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pablum
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Joined: December 17, 2015
Posts: 562
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| Posted: Thu Mar 02, 2017 3:14 pm Post subject: Re: Testing Aux Air Regulator |
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You can look back over your own argument and see it contradicts the initial assertion.
Even though this isn't a DF system, they work similarly, here the AAR is used by the ECU to maintain AFR.
At least, that's my take on it.
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The wise man learns from history, the fool from experience.
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I see [a cat] in the street and i aim for the pest with my car. --  bluebus86 |
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jerryherb
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Joined: October 30, 2015
Posts: 205
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| Posted: Thu Mar 02, 2017 3:27 pm Post subject: Re: Testing Aux Air Regulator |
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| pablum wrote: |
You can look back over your own argument and see it contradicts the initial assertion.
Even though this isn't a DF system, they work similarly, here the AAR is used by the ECU to maintain AFR.
At least, that's my take on it. |
Hence if AAR is stuck closed at cold idle the engine runs rich because ECU doesnt know any better otherwise why the blue smoke, crappy idle and smell of unburned fuel? I wish I had the logic map of how the ECU adjusts the FI timing based on AFR/high TII resistance/hall sender while excluding single wire O2. damn magic box. i suppose it can be backward engineered with scopes, power supplies and pots...
Last edited by jerryherb on Thu Mar 02, 2017 3:36 pm; edited 1 time in total |
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pablum
Samba Member
Joined: December 17, 2015
Posts: 562
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| Posted: Thu Mar 02, 2017 3:36 pm Post subject: Re: Testing Aux Air Regulator |
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| jerryherb wrote: |
| pablum wrote: |
You can look back over your own argument and see it contradicts the initial assertion.
Even though this isn't a DF system, they work similarly, here the AAR is used by the ECU to maintain AFR.
At least, that's my take on it. |
Hence if AAR is stuck closed at cold idle the engine runs rich because ECU doesnt know any better |
Dead wrong. The ECU doesn't know the AAR is stuck but it very well knows the AFR.
_________________
The wise man learns from history, the fool from experience.
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I see [a cat] in the street and i aim for the pest with my car. -- bluebus86 |
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jerryherb
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Joined: October 30, 2015
Posts: 205
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| Posted: Thu Mar 02, 2017 3:48 pm Post subject: Re: Testing Aux Air Regulator |
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| pablum wrote: |
Dead wrong. The ECU doesn't know the AAR is stuck but it very well knows the AFR. |
Hmmmm, now that i think about it youre all right. im still gonna screw around with the wideband to see why my idle is super low (600-700) every time i start the beast regardless whether its hot or cold until i give it gas (air) after which it stabilizes. please kick me in the right direction |
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pablum
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Joined: December 17, 2015
Posts: 562
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| Posted: Fri Mar 03, 2017 8:29 am Post subject: Re: Testing Aux Air Regulator |
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| jerryherb wrote: |
| pablum wrote: |
Dead wrong. The ECU doesn't know the AAR is stuck but it very well knows the AFR. |
Hmmmm, now that i think about it youre all right. im still gonna screw around with the wideband to see why my idle is super low (600-700) every time i start the beast regardless whether its hot or cold until i give it gas (air) after which it stabilizes. please kick me in the right direction |
Idle adjustment procedure in accordance with the Bentley is first idle stop, then CO and throttle bypass (idle screw) together, while the O2sensor is disconnected (edit for correctness)
My experience is only DF so I'm going by analogy... for digifant it's important to clear the memory before setting the idle by unplugging the O2 sensor when the engine is turned off.
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The wise man learns from history, the fool from experience.
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I see [a cat] in the street and i aim for the pest with my car. -- bluebus86 |
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