I need 2 B4 owners to test the new hi-flow airbox velocity stack...
06-08-2008, 09:57 AM
#1
AudiWorld Super User
Thread Starter
I need 2 B4 owners to test the new hi-flow airbox velocity stack...
<center><img src="http://pictureposter.audiworld.com/711/hiflob4vs3.jpg"></center><p>
candidates should have a stock airbox with a paper element that has fewer than 20k on the odometer. Also only candidates with OEM style O2 sensors and no generic/universals of ANY kind, PERIOD! Prefer fresh/recent sub 50k miles O2 sensors. Sub 40k would be even better!
I've got one tester in town running flawlessly with new OEM sensors and one with generics sensors that throws codes daily but he can't afford to upgrade and I need to find out why these hate generics as well as tired old OEM sensors. The codes in the generic-sensor equipped car go away when key is turned off and back on but I'm not convinced that car is performing as well as it could because every time th CEL comes on it starts to idle a wee bit rougher than it does without the CEL. You can definately "feel" the CEL come on even without benefit of the light that confirms it. This VS puts a LOT more air at a MUCH higher velocity across the MAF sensor wires and will eliminate the need for sensor tip o-rings in EVERY MAF housing I've ever made/offered! But that "may" require a bit more from 02 sensors than they deliver with stock induction system.
And to avoid complications I need this to be a "real deal" B4 and not a C-chassis car with a B4 airbox. It just cannot be a valid test at this point in time if it's done any other way. We'll get to those other cars later but for now I'm trying to eliminate any/all variables that could influence the new VS's efficiency.
One thing I will tell the prospective testers is that you WILL feel this VS compared to it's predecessors and it's a dramatic improvement over all airbox VS's that have gone before. After ECU adaption engine will idle smoother and pull much more aggressively to redline... especially at & above manifold switchover RPM.
I'm getting slightly better performance with these being fitted permanently to the airboxes by "swaging" them into place in the airbox outlet bore but due to cost and logistics am struggling with making that a mandatory option as it ould reuire "exchange units" be offered/sold with accompanying deposits and the quality of airboxes I'm seeing on the used market vary GREATLY as far as physical condition... they are warped, scratched, hairline fractured etc etc. I have to look thru 15-20 airboxes in the salvage yard to find 5 I'm willing to pay for. And that doesn't bode well for any attempt at "what-you-send-is-what-you-get" airbox lid exchange program.
Selected testers are free to use, test and evaluate these and keep them at test-end with my thanks. If a new design is required due to test findings those testers will also receive that free of charge including shipping. And we'll keep doing that til I get it right. But these are pretty damn good even today!
Pic shows old style on left with hi-flow units on right top/bottom.
I will move on to other applications once I have a widely endorsed B4 that is working flawlessy and to eeryone's satisfaction. Does me no good to approach this with any kind of wide-dispersal fitments until the basic platform works
candidates should have a stock airbox with a paper element that has fewer than 20k on the odometer. Also only candidates with OEM style O2 sensors and no generic/universals of ANY kind, PERIOD! Prefer fresh/recent sub 50k miles O2 sensors. Sub 40k would be even better!
I've got one tester in town running flawlessly with new OEM sensors and one with generics sensors that throws codes daily but he can't afford to upgrade and I need to find out why these hate generics as well as tired old OEM sensors. The codes in the generic-sensor equipped car go away when key is turned off and back on but I'm not convinced that car is performing as well as it could because every time th CEL comes on it starts to idle a wee bit rougher than it does without the CEL. You can definately "feel" the CEL come on even without benefit of the light that confirms it. This VS puts a LOT more air at a MUCH higher velocity across the MAF sensor wires and will eliminate the need for sensor tip o-rings in EVERY MAF housing I've ever made/offered! But that "may" require a bit more from 02 sensors than they deliver with stock induction system.
And to avoid complications I need this to be a "real deal" B4 and not a C-chassis car with a B4 airbox. It just cannot be a valid test at this point in time if it's done any other way. We'll get to those other cars later but for now I'm trying to eliminate any/all variables that could influence the new VS's efficiency.
One thing I will tell the prospective testers is that you WILL feel this VS compared to it's predecessors and it's a dramatic improvement over all airbox VS's that have gone before. After ECU adaption engine will idle smoother and pull much more aggressively to redline... especially at & above manifold switchover RPM.
I'm getting slightly better performance with these being fitted permanently to the airboxes by "swaging" them into place in the airbox outlet bore but due to cost and logistics am struggling with making that a mandatory option as it ould reuire "exchange units" be offered/sold with accompanying deposits and the quality of airboxes I'm seeing on the used market vary GREATLY as far as physical condition... they are warped, scratched, hairline fractured etc etc. I have to look thru 15-20 airboxes in the salvage yard to find 5 I'm willing to pay for. And that doesn't bode well for any attempt at "what-you-send-is-what-you-get" airbox lid exchange program.
Selected testers are free to use, test and evaluate these and keep them at test-end with my thanks. If a new design is required due to test findings those testers will also receive that free of charge including shipping. And we'll keep doing that til I get it right. But these are pretty damn good even today!
Pic shows old style on left with hi-flow units on right top/bottom.
I will move on to other applications once I have a widely endorsed B4 that is working flawlessy and to eeryone's satisfaction. Does me no good to approach this with any kind of wide-dispersal fitments until the basic platform works
06-08-2008, 10:18 AM
#5
AudiWorld Super User
Thread Starter
The highest CFM of air at the highest velocity w/the smoothest air column across sensor wires...
<center><img src="http://pictureposter.audiworld.com/711/hiflob4vs2.jpg"></center><p>
comes from this design which stems from reverse-flaring the outlet end to a very specific taper angle degree and length. This is accomplished by swaging the VS into the airbox lid over a mating die that has the exact outlet angle required for smoothest airflow after the VS is installed in the airbox outlet bore. This serves the multi benefit of increasing volume, velocity and simultaneously smoothing the air column flowing thru it as well as locking the VS into the airbox outlet by swaging the aluminum VS outward at a very specific angle and against the airbox oulet bore ID.
Every time I make one of these even in the slightest different configuration to flow-test I have to destroy the VS to remove it from the airbox outlet bore. To-date there are well over 60/70 in my recycle bin!
comes from this design which stems from reverse-flaring the outlet end to a very specific taper angle degree and length. This is accomplished by swaging the VS into the airbox lid over a mating die that has the exact outlet angle required for smoothest airflow after the VS is installed in the airbox outlet bore. This serves the multi benefit of increasing volume, velocity and simultaneously smoothing the air column flowing thru it as well as locking the VS into the airbox outlet by swaging the aluminum VS outward at a very specific angle and against the airbox oulet bore ID.
Every time I make one of these even in the slightest different configuration to flow-test I have to destroy the VS to remove it from the airbox outlet bore. To-date there are well over 60/70 in my recycle bin!
