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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="truckguy" data-source="post: 12518879" data-attributes="member: 99809"><p>I dont think anyone would disagree that real airflow data is the way to go. The issue becomes when something changes and you only want to use that data. For example, put a ram air hood on and the car starts to lean out at wot because the path across the meter changes. Your flow bench will not compensate for that and your load values WILL be incorrect. Now granted that would be a hardware change that caused the issue and the correct fix would be to fix the hardware but if you didnt catch it and left the data you copied and pasted from the flow bench, the pcm would have an improper load calculation using your method.</p><p></p><p></p><p></p><p>He mentioned an 03 cobra with stock injectors and a bap. If the bap is pre-fpdm, then the pcm still regulates the rail to 39psi. There is no reason you cant back calculate the airflow values from there since nothing is working different than stock. You are not introducing any fueling errors into the equation with a bap that way. The only thing off on those two scenarios he mentioned would be the maf curve and doing it the way Greg mentioned would ensure load calculations would be correct.</p><p></p><p> </p><p></p><p>You are exactly correct here. It is not the end all be all or magic fix for fueling. However simply inputting data like you say is not the end all be all either and that is what most people here are disagreeing with you on.</p><p></p><p></p><p></p><p>It is a good and preferred starting point but not impossible. Greg already explained how it is done.</p><p></p><p></p><p></p><p></p><p>The key is the tuner needs to recognize and understand where the fueling error is coming from and that is where most fall short. If it is a 3 or 4% fueling error, putting that extra fuel into the maf isnt going to hurt a thing but you correct what needs correct. You dont simply just add it to the maf because it is there. I think that is the point you are trying to make but the way you are presenting it is that if someone adjust the maf other than the way you do it then they are doing it wrong which is simply inaccurate.</p><p></p><p></p><p></p><p></p><p>Well, if you input your flow bench data and you have an intake that is 7-10% off from your flow bench data, then you just affected your load by the same margin......Im assuming you do realize this right?</p></blockquote><p></p>
[QUOTE="truckguy, post: 12518879, member: 99809"] I dont think anyone would disagree that real airflow data is the way to go. The issue becomes when something changes and you only want to use that data. For example, put a ram air hood on and the car starts to lean out at wot because the path across the meter changes. Your flow bench will not compensate for that and your load values WILL be incorrect. Now granted that would be a hardware change that caused the issue and the correct fix would be to fix the hardware but if you didnt catch it and left the data you copied and pasted from the flow bench, the pcm would have an improper load calculation using your method. He mentioned an 03 cobra with stock injectors and a bap. If the bap is pre-fpdm, then the pcm still regulates the rail to 39psi. There is no reason you cant back calculate the airflow values from there since nothing is working different than stock. You are not introducing any fueling errors into the equation with a bap that way. The only thing off on those two scenarios he mentioned would be the maf curve and doing it the way Greg mentioned would ensure load calculations would be correct. You are exactly correct here. It is not the end all be all or magic fix for fueling. However simply inputting data like you say is not the end all be all either and that is what most people here are disagreeing with you on. It is a good and preferred starting point but not impossible. Greg already explained how it is done. The key is the tuner needs to recognize and understand where the fueling error is coming from and that is where most fall short. If it is a 3 or 4% fueling error, putting that extra fuel into the maf isnt going to hurt a thing but you correct what needs correct. You dont simply just add it to the maf because it is there. I think that is the point you are trying to make but the way you are presenting it is that if someone adjust the maf other than the way you do it then they are doing it wrong which is simply inaccurate. Well, if you input your flow bench data and you have an intake that is 7-10% off from your flow bench data, then you just affected your load by the same margin......Im assuming you do realize this right? [/QUOTE]
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Is Your Car Tuned Correctly?
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