| First, thanks for the honest answer. The bell mouth inlet (I think you call them velocity stacks) are designed to minimize diffuser losses. Compared to the stock setup I don't think there is a significant pressure loss difference. But I'm assuming our engines are fairly sensitive to the inlet pressure drops otherwise why bother with POP chargers, larger intake pipes, etc. as easy bolt-on mods in stage I upgrades? I'm not sure what you mean by columnated but I imagine you mean the screen is designed to mix boundary layer flow with the (potentially) laminar flow in the middle of the duct such that the MAF sensor accurately predicts the average flow rate. That may be so but then there's certainly no reason to have another screen downstream. Plus is there really enough L/D between the screen and the sensor for this to be effective? I imagine the downstream one is there simply to protect the sensitive hot wire anemometer from jimmy-job mechanics. I agree the screen will hardly remove any swirl but I'm not convinced the pressure drop across the screen is insignificant at high power. Has anyone ever tried to remove the screens, recalibrate the MAF, and measure the performance impact? Or replace the screens with a flow straightening device (recal and measure performance)?
Zarcasm(Hfd, CT)
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