![]() ![]() ![]() The filtration surface area of the CSL filter is massive in comparison, and remember that only one cylinder at a time is in the meat of its intake stroke, so you essentially have the entire CSL filter area providing airflow for each cylinder. Not only do you have almost zero filtration, you actually have very little flow surface area. The absolute worst thing you can do is run those "rock stopper" stainless mesh filters on each stack. It gets even worse if you then add individual filters for each stack. You just won't beat the CSL airbox with any sort of open velocity stacks, even for peak power. I'm sure at some point someone tested stacks vs a box with no other changes while on the dyno, right?Yeah, done this test a few times in a few different ways. ![]() What it does it provide better low end throttle for daily driven cars.Įven the companies that make velocity stacks for the S54 don't show any dyno charts or talk about power numbers. There's no way it makes more power on the high end. Because I see this trumpeted all over the forums with zero evidence shown.Īlso, I'm not talking about sound, which everyone seems very hung up on.Īn airbox is a restriction when you're moving large amounts of air. What I'm asking for is dynos to back this up. You are probably one of the few people on the board with first hand experience. Come to a stop, heat builds up, you take off and a bunch of hot air is sucked in at that moment in time, then less and less hot air as the car moves along. Maybe some of that was inconsistency in the driver, but still my takeaway was that an unducted CSL style plenum is not THAT much better at controlling under hood heat ingestion from a stop.Makes sense. I had a Karb plenum on my car and when I was drag racing it if we hot lapped it we could see the car slowing down, taking the hood off netted me 3 tenths in the quarter. So if I was cruising down the highway for 2 miles and went WOT the stacks were not sucking a ton of "heat" as read by the IAT. I found that after coming from a stop that the IAT read much higher than ambient, but would eventually make it down to just slightly above ambient. At that time I had the IAT mounted on the strut tower. I had just stacks on my car for a little bit as they are certainly fun. ![]()
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