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SVTPerformance's Chain of Restaurants
Road Side Pub
Restrictor plate math help
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<blockquote data-quote="SecondhandSnake" data-source="post: 16628435" data-attributes="member: 116684"><p>I think the logic is right when it comes to creating a restrictor upstream of the throttle plates- figuring out the necessary cross sectional area based on the total area of the twin throttle bodies multiplied by the correction factor you're looking for.</p><p></p><p>However i don't know if I'd run with the assumption that his percentage decrease will work for you. Do you have data for power and airflow for both of your cars? I would use that (and implicitly VE) to calculate it for your car. Airflow numbers would be king, but if not, you could probably make some approximations with VE.</p><p></p><p>In an ideal world, you would know LT1 airflow start and LT1 airflow finish, and that represents a 30.6% reduction in cross sectional area. You could take your actual airflow start, figure out what airflow you need to be at (linear interpolation based on target power/current power should be close enough), then interpolate/extrapolate that to his numbers and get your approximate change.</p><p></p><p>Ex: (LT1 delta airflow/30.6) = (Your delta airflow/X)</p><p></p><p>Lots of incorrect and over simplified assumptions, but it would be a start. If you had to, you could approximate airflow numbers based on some assumed VE values.</p><p></p><p>And if you're not confident in getting it on the first try, you could try a few different approaches. You could try bracketing with one that will overshoot and one that will undershoot. Then select something that is proportionally in between where you want it. Or just overshoot and interpolate based on that.</p><p></p><p>I feel like there's some much more elegant solutions/equations buried somewhere in one of my old fluid dynamics books. But I'll leave that to snover.</p></blockquote><p></p>
[QUOTE="SecondhandSnake, post: 16628435, member: 116684"] I think the logic is right when it comes to creating a restrictor upstream of the throttle plates- figuring out the necessary cross sectional area based on the total area of the twin throttle bodies multiplied by the correction factor you're looking for. However i don't know if I'd run with the assumption that his percentage decrease will work for you. Do you have data for power and airflow for both of your cars? I would use that (and implicitly VE) to calculate it for your car. Airflow numbers would be king, but if not, you could probably make some approximations with VE. In an ideal world, you would know LT1 airflow start and LT1 airflow finish, and that represents a 30.6% reduction in cross sectional area. You could take your actual airflow start, figure out what airflow you need to be at (linear interpolation based on target power/current power should be close enough), then interpolate/extrapolate that to his numbers and get your approximate change. Ex: (LT1 delta airflow/30.6) = (Your delta airflow/X) Lots of incorrect and over simplified assumptions, but it would be a start. If you had to, you could approximate airflow numbers based on some assumed VE values. And if you're not confident in getting it on the first try, you could try a few different approaches. You could try bracketing with one that will overshoot and one that will undershoot. Then select something that is proportionally in between where you want it. Or just overshoot and interpolate based on that. I feel like there's some much more elegant solutions/equations buried somewhere in one of my old fluid dynamics books. But I'll leave that to snover. [/QUOTE]
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SVTPerformance's Chain of Restaurants
Road Side Pub
Restrictor plate math help
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