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Originally Posted by niterydr
Prove to me for once that it isn't a marketing gimmic.
Thats right, I want YOU to prove to ME something for once. I've done my research, my opinion stands.
Until that is done, I am saying that 99% of the time, it is a term that is thrown around and used to describe a poorly designed transition for a runner inlet.
Maybe I'll back to back test them on our flow bench (once its done). Heck I'd even donate some dyno time if someone wanted to test them.* Until then it's just a theory. I know of manifolds for different applications that use and don't use velocity stacks. The majority of the time, on a forced induction setup, it is a wash. Where in a NA environment, you usually see the gains with a velocity stack or a "bell" inlet for intake runners.
*But I would want the EXACT same manifold with and without velocity stacks. If its on the dyno, same car, same mods, same day.
I've done all the research on this I can. If I truely want to know, we'll design a intake manifold with both and test it. Until then, I am tired of reading about it and coming up with inconclusive data. (as far as velocity stacks on a forced induction setup is concerned)
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You've done your research but yet you have proven nothing. Everything I have said I can go grab my Fluid Mechanics textbook and
site exact pages that I used to make any technical comments in this thread. You keep talking about the research you've done, let's see some documents. I'm not questioning what you're saying but I'm questioning how you're presenting your information. Too many of you all have been around the DSM far longer than me to start questioning any of what you're saying, which is why I'm asking for documentation of your claims. Any SAE papers?
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Originally Posted by niterydr
I am thinking they are acting as a restriction on the turbo applications.
All I know, is all the digging I've done, I have yet to find concrete proof as far as a turbo'd application is concerned. Alot of the intake manifold design has been taken from N/A applications. In N/A applications, they have been proven to open up the rpm range and add power in some instances. I haven't seen anyone do back to back research on a FI setup.
To me, someone saying that you MUST have velocity stacks on a intake manifold (on a turbo car) just annoys the piss out of me.
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Where did anyone in this thread say that velocity stacks are a MUST?
Time for reading:
http://www.webpages.uidaho.edu/~racing/05FFL-188.pdf
http://www.grapeaperacing.com/GrapeA...ionsystems.pdf
http://www.lesoft.co.uk/ (Go to papers)