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SVTPerformance's Chain of Restaurants
Tuning À la carte
Is Your Car Tuned Correctly?
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<blockquote data-quote="91svtbird" data-source="post: 12494300" data-attributes="member: 37026"><p><span style="color: Yellow">encasedmetal; being that I am a self taught amateur tuner using SCT PRP I have a few questions.</span></p><p><span style="color: Yellow">1. isn't tuning the maf curve via datalogged info the same as obtaining flow data from a work bench.</span></p><p></p><p><strong>Absolutely not the same. A flow bench measures actual air flow and plots it in terms of voltage or frequency depending on what type of sensor you are using. You are only looking at the MAF. The flow bench is only used to obtain a real and actual transfer functions for that particular MAF housing combo.</strong></p><p><strong></strong></p><p><strong>When Data-logging you are looking at voltage and RPM and you are changing the transfer functions to adjust for desired air fuel. By doing so you are telling the engine it is moving either more or less air than it actually is. By doing this you are not really taking into consideration all of your fuel system's flow. (which can affect your A/f ratios)</strong></p><p><strong></strong></p><p><strong>Load is directly related to "Airflow" if the airflow reading is not accurate the load tables will <u>never be correct</u>.</strong></p><p></p><p><span style="color: Yellow">2. if you were to use a flow bench method what is to say that the data will hold true in the vehicle? I have seen 1/8 of a turn on a maf housing take a perfectly running car to not able to start even. and I'm talking about slot mafs, much less a non slot maf. </span> </p><p></p><p> <strong> You will see that more if you have a "bend" in <u>front</u> of the meter which will change the way the air goes past the sensor depending on the position of the bend. In this case you would have to have that setup flowed in the exact position you are running it in the car. Then it would be fine.</strong></p><p><strong>A straight through meter doesn't have this issue because you are not changing how the air goes past the sensor.</strong></p><p></p><p></p><p><span style="color: Yellow">3. I understand the theory behind changing injectors slopes etc, just like on standalone systems, but those systems also work with VE tables that maf based systems don't have- so isn't that where the maf tables come in? thanks</span></p><p></p><p><strong>Mass Air is actual air flow VE is speed density which is not actual air flow. Two totally different systems. Different discussion..</strong></p></blockquote><p></p>
[QUOTE="91svtbird, post: 12494300, member: 37026"] [COLOR="Yellow"]encasedmetal; being that I am a self taught amateur tuner using SCT PRP I have a few questions. 1. isn't tuning the maf curve via datalogged info the same as obtaining flow data from a work bench.[/COLOR] [B]Absolutely not the same. A flow bench measures actual air flow and plots it in terms of voltage or frequency depending on what type of sensor you are using. You are only looking at the MAF. The flow bench is only used to obtain a real and actual transfer functions for that particular MAF housing combo. When Data-logging you are looking at voltage and RPM and you are changing the transfer functions to adjust for desired air fuel. By doing so you are telling the engine it is moving either more or less air than it actually is. By doing this you are not really taking into consideration all of your fuel system's flow. (which can affect your A/f ratios) Load is directly related to "Airflow" if the airflow reading is not accurate the load tables will [U]never be correct[/U].[/B] [COLOR="Yellow"]2. if you were to use a flow bench method what is to say that the data will hold true in the vehicle? I have seen 1/8 of a turn on a maf housing take a perfectly running car to not able to start even. and I'm talking about slot mafs, much less a non slot maf. [/COLOR] [B] You will see that more if you have a "bend" in [U]front[/U] of the meter which will change the way the air goes past the sensor depending on the position of the bend. In this case you would have to have that setup flowed in the exact position you are running it in the car. Then it would be fine. A straight through meter doesn't have this issue because you are not changing how the air goes past the sensor.[/B] [COLOR="Yellow"]3. I understand the theory behind changing injectors slopes etc, just like on standalone systems, but those systems also work with VE tables that maf based systems don't have- so isn't that where the maf tables come in? thanks[/COLOR] [B]Mass Air is actual air flow VE is speed density which is not actual air flow. Two totally different systems. Different discussion..[/B] [/QUOTE]
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