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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="BobCat" data-source="post: 12518142" data-attributes="member: 72507"><p>This is some of the most mis-leading and false information regarding tuning that I have ever personally witnessed in public display. </p><p></p><p>According to Larocca's "blackshelby" method the Airflow remains the constant and only the injector data will be altered... This is 100% false...</p><p></p><p>I have dozen upon dozen of flow sheets from different MAF's and they are all different as the consistency among them is within 7-10% at best. </p><p></p><p>The MAF is the single most inconsistent sensor on the vehicle due to its construction and design. We see older 100% stock vehicles with the fueling off up to 7% or more very frequently and this trend follows the MAF.</p><p></p><p>It is not possible to correctly calibrate a vehicle without altering the most in-accurate and in-consistent sensor in the process. </p><p></p><p>While I agree the in a perfect world every MAF and Inlet assembly would be flowed and tested this just isn't possible due to time and financial constants. Therefor the next best alternative is using the Fuel System as a constant and tweaking the MAF on an individual basis to dial in fueling.</p><p></p><p>Example with 2 2003 Cobras with the exact same and very common mods....</p><p>Test Vehicle:</p><p></p><p>JLT CAI</p><p>SCT-2400 MAF</p><p>Stock Injectors</p><p>BAP</p><p>2.76 upper</p><p>Everything else is unmodified.</p><p></p><p>If you swap MAF's from one vehicle to the other the calibration will most certainly change....if you swap injectors the calibration will be very very close</p><p></p><p>No one in the industry will argue the facts that I just presented and this exact combination has been done hundreds of times....</p><p></p><p>Another example to falsify the previous claims.... </p><p></p><p>Stock 2003 Cobra with the same mods as above with Stage 3 Camshafts.... this vehicle will have revision due to the overlap in the cam profile and will require changes to the Air Model to compensate. Regardless of what the Flow bench tells you about the transfer function when it is on a vehicle with a very low vacuum signal that has inlet revision and the heated elements are not being cooled in the same manner as a constant flow on the bench it will skew the results. </p><p></p><p>There are most certainly applications where slope tuning would be a preferred method of calibration but to say "never touch the MAF transfer" is incorrect and mis-leading information.</p></blockquote><p></p>
[QUOTE="BobCat, post: 12518142, member: 72507"] This is some of the most mis-leading and false information regarding tuning that I have ever personally witnessed in public display. According to Larocca's "blackshelby" method the Airflow remains the constant and only the injector data will be altered... This is 100% false... I have dozen upon dozen of flow sheets from different MAF's and they are all different as the consistency among them is within 7-10% at best. The MAF is the single most inconsistent sensor on the vehicle due to its construction and design. We see older 100% stock vehicles with the fueling off up to 7% or more very frequently and this trend follows the MAF. It is not possible to correctly calibrate a vehicle without altering the most in-accurate and in-consistent sensor in the process. While I agree the in a perfect world every MAF and Inlet assembly would be flowed and tested this just isn't possible due to time and financial constants. Therefor the next best alternative is using the Fuel System as a constant and tweaking the MAF on an individual basis to dial in fueling. Example with 2 2003 Cobras with the exact same and very common mods.... Test Vehicle: JLT CAI SCT-2400 MAF Stock Injectors BAP 2.76 upper Everything else is unmodified. If you swap MAF's from one vehicle to the other the calibration will most certainly change....if you swap injectors the calibration will be very very close No one in the industry will argue the facts that I just presented and this exact combination has been done hundreds of times.... Another example to falsify the previous claims.... Stock 2003 Cobra with the same mods as above with Stage 3 Camshafts.... this vehicle will have revision due to the overlap in the cam profile and will require changes to the Air Model to compensate. Regardless of what the Flow bench tells you about the transfer function when it is on a vehicle with a very low vacuum signal that has inlet revision and the heated elements are not being cooled in the same manner as a constant flow on the bench it will skew the results. There are most certainly applications where slope tuning would be a preferred method of calibration but to say "never touch the MAF transfer" is incorrect and mis-leading information. [/QUOTE]
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