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Calc BPW (Don't use Table) in TunerPro

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Old Apr 28, 2008 | 09:19 AM
  #1  
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Calc BPW (Don't use Table) in TunerPro

"Calc BPW (Don't use Table)" in TunerPro.

Does anyone know what this flag does? I've noticed that it's checked in some bins and not in others.

The ones it's checked in don't seem to run as well as the ones it's not checked. But since I don't know what it does, I can't decide if it's causing the effects I'm observing.
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Old Apr 28, 2008 | 11:15 AM
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Re: Calc BPW (Don't use Table) in TunerPro

In $6E it is a dead flag. Doesn't do a thing.

In $32 it decides whether the code looks up the injector PW from the LV8/RPM table. Or from a calculation based on MAF airflow.

RBob.
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Old Apr 28, 2008 | 11:24 AM
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Re: Calc BPW (Don't use Table) in TunerPro

Originally Posted by RBob
In $6E it is a dead flag. Doesn't do a thing.

In $32 it decides whether the code looks up the injector PW from the LV8/RPM table. Or from a calculation based on MAF airflow.
So does $6E use the LV8/RPM table, or does it use the MAF airflow?
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Old Apr 28, 2008 | 07:45 PM
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Re: Calc BPW (Don't use Table) in TunerPro

Good question, to calculate the PW it uses the MAF airflow and injector constant ($6E).

RBob.
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Old Apr 28, 2008 | 09:05 PM
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Re: Calc BPW (Don't use Table) in TunerPro

Originally Posted by RBob
Good question, to calculate the PW it uses the MAF airflow and injector constant ($6E).

RBob.

Oh I see. That's probably why a descreened MAF needs to have the MAF tables modified... but wait, that seems to indicate that $6E would be the only good option ($32 verses $6E) for for tuning with a modified MAF sensor....
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Old Apr 29, 2008 | 08:01 AM
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Re: Calc BPW (Don't use Table) in TunerPro

Originally Posted by mnorton
Oh I see. That's probably why a descreened MAF needs to have the MAF tables modified... but wait, that seems to indicate that $6E would be the only good option ($32 verses $6E) for for tuning with a modified MAF sensor....
Not really, both $32 & $6E can/will use the MAF airflow & injector constant to calculate the injector PW.

And, LV8 is a calculation based on MAF airflow, engine RPM, and a displacement scalar. So using the PW table still depends upon the airflow measurement from the MAF.

RBob.
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Old Oct 1, 2008 | 07:25 AM
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Re: Calc BPW (Don't use Table) in TunerPro

Originally Posted by RBob
Not really, both $32 & $6E can/will use the MAF airflow & injector constant to calculate the injector PW.

And, LV8 is a calculation based on MAF airflow, engine RPM, and a displacement scalar. So using the PW table still depends upon the airflow measurement from the MAF.

RBob.
So in this equation the displacement scalar is 80?

LV8 = ((((983040 / RPM) * gms/sec) / 256) * 80) / 64


Would this need changed, for a larger displacement motor?
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