Gains from a velocity stack on a turbo Honda
07-15-2009, 02:26 AM
#1
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Gains from a velocity stack on a turbo Honda
blox 4" velocity stack gains - Honda-Tech
He was using no filter and the stack (Blox 4") was directly mounted to the turbo.
It'd be interesting to see gains/losses w/ an arm/stack/filter.
He was using no filter and the stack (Blox 4") was directly mounted to the turbo.
It'd be interesting to see gains/losses w/ an arm/stack/filter.
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07-15-2009, 10:07 AM
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Quoted from the thread
Clearly not an engineer.
Not sure why the guy had to spend $300 on it. With some creativity it should have been possible to do it for less.
Is there any speculation as to exactly what causes this bell make more power up top?
Clearly not an engineer.Not sure why the guy had to spend $300 on it. With some creativity it should have been possible to do it for less.
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07-16-2009, 09:44 AM
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Yeah I would not use one unless I put a large air filter on the inlet of the nozzle aka 'velocity stack'. They work, no doubt about it, but I am not about to rearrange my entire CAI setup for that small of a gain.
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07-16-2009, 10:09 AM
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there is merit to the bell inlet. air doesn't turn sharp corners.
but
no filter = dragster
and filter = reduced bell function
so ... draw your own conclusions.
but
no filter = dragster
and filter = reduced bell function
so ... draw your own conclusions.
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07-16-2009, 10:14 AM
#15
What you really have to do is make sure that the filter is atleast 1 Diameter away from the edge of the bell, and your surface area of filter media to inlet area is rediculously large. So a proper setup would be around 10 inches in diamater, and maybe 4 inches deep. Like a big carb filter. Maybe one of those extreme flows withe the filter media on top as well. Then imagine ducting?
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07-16-2009, 10:34 AM
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^^ Yeah exactly. No thanks, at least not on a street car.
There is no real magic to these bells. They are basically just nozzles with tapered reduction sections. The decrease in head loss (pressure drop loosely speaking) is well understood in the world of fluid mechanics and can be calculated.
There is no real magic to these bells. They are basically just nozzles with tapered reduction sections. The decrease in head loss (pressure drop loosely speaking) is well understood in the world of fluid mechanics and can be calculated.
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07-16-2009, 10:54 AM
#17
I had considered one of these Turbohoses AirRam & Velocity Stacks, Velocity Stack, Air Ram, Intake, Airram Intake, Turbohoses Intake because I "think" my current filter may be a restriction. I haven't hooked a vacuum gauge up between the filter and throttle body yet to see though.
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07-16-2009, 11:55 AM
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What you really have to do is make sure that the filter is atleast 1 Diameter away from the edge of the bell, and your surface area of filter media to inlet area is rediculously large. So a proper setup would be around 10 inches in diamater, and maybe 4 inches deep. Like a big carb filter. Maybe one of those extreme flows withe the filter media on top as well. Then imagine ducting?
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07-16-2009, 08:30 PM
#19
I don't know on that, but if your trying to increase the discharge coefficient you can't choke the edge of your bell with flat edges, or your not going to accomplish anything. The purpose of the bell is to dramatically decrease pressure gradient DX,DY,DZ spherically away from the entry so that entrance velocity is decreased, and smaller eddys form around the neck point of the flow in the front of the pipe..
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07-16-2009, 09:09 PM
#20
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I don't know on that, but if your trying to increase the discharge coefficient you can't choke the edge of your bell with flat edges, or your not going to accomplish anything. The purpose of the bell is to dramatically decrease pressure gradient DX,DY,DZ spherically away from the entry so that entrance velocity is decreased, and smaller eddys form around the neck point of the flow in the front of the pipe..
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