2012 Track Junkie Thread
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Joined: Nov 2005
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From: Maryland
So now that I have mounted my Rcomp tires on my RPF1s and allseasons on AP2V2s I have a dilema.....what wheel to wear for the dragon trip? Somehow I don't think that making a 7 hour trip with Threadwear: 60 rating tires is a good idea 
. I might have to slide around on all-seasons a bit I guess ;0
. I might have to slide around on all-seasons a bit I guess ;0
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Originally Posted by Olegator' timestamp='1332481007' post='21535892
So now that I have mounted my Rcomp tires on my RPF1s and allseasons on AP2V2s I have a dilema.....what wheel to wear for the dragon trip? Somehow I don't think that making a 7 hour trip with Threadwear: 60 rating tires is a good idea . I might have to slide around on all-seasons a bit I guess ;0
. I might have to slide around on all-seasons a bit I guess ;0
I'm assuming all lights are good to go now?
Joined: Dec 2007
Posts: 3,641
Likes: 1
From: Gaithersburg, MD
Hey Pedro,
"duct Kevin is using has the right shape to provide a low pressure zone for the air to go into"
In order for the air to flow there should be a pressure gradient. In order for the air to flow towards the rotor the pressure at the rotor should be even less...
Ragardless, talking details like that through chat is really not efficient, maybe we can discuss whenever we see each other at the meets...
BTW, Kevin, There are couple of simple modifications that you can make to your duct that should improve its efficiency considerably. Call me up
The idea is to slow down the airflow at the intake port.
"duct Kevin is using has the right shape to provide a low pressure zone for the air to go into"
In order for the air to flow there should be a pressure gradient. In order for the air to flow towards the rotor the pressure at the rotor should be even less...
Ragardless, talking details like that through chat is really not efficient, maybe we can discuss whenever we see each other at the meets...
BTW, Kevin, There are couple of simple modifications that you can make to your duct that should improve its efficiency considerably. Call me up
The idea is to slow down the airflow at the intake port.
Joined: May 2007
Posts: 2,688
Likes: 1
From: Arlington, VA
Hey Pedro,
"duct Kevin is using has the right shape to provide a low pressure zone for the air to go into"
In order for the air to flow there should be a pressure gradient. In order for the air to flow towards the rotor the pressure at the rotor should be even less...
Ragardless, talking details like that through chat is really not efficient, maybe we can discuss whenever we see each other at the meets...
BTW, Kevin, There are couple of simple modifications that you can make to your duct that should improve its efficiency considerably. Call me up
The idea is to slow down the airflow at the intake port.
"duct Kevin is using has the right shape to provide a low pressure zone for the air to go into"
In order for the air to flow there should be a pressure gradient. In order for the air to flow towards the rotor the pressure at the rotor should be even less...
Ragardless, talking details like that through chat is really not efficient, maybe we can discuss whenever we see each other at the meets...
BTW, Kevin, There are couple of simple modifications that you can make to your duct that should improve its efficiency considerably. Call me up
The idea is to slow down the airflow at the intake port.
That would be cool. We might also need some simulation software.
A small vertical flap a few inches before the opening of the NACA duct (just like the little flap ahead of the tire) might just do the trick.
Thread Starter
Joined: Mar 2005
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Yeah Rob, Pedro, Oleg, I am not disputing the fact that the front mounted ducts would get more airflow, due to higher pressure on the nose. I am also not saying I know a lot about thermodynamics/aerodynamics, etc. 
I just was trying something different due to the difficulties with the shape of the AP2 faux ducts/bumper shape etc. I had considered mounting some square ducts on the inside opening where the radiator is, but was thinking perhaps the hoses would have to be too long and snaked too much. I felt the NACA ducts delivered a shorter straighter path without having to hack up my bumper. I would like to try some measurements with the infared thermometer to see if the ducts do make any sort of a difference, and I do have a couple ideas for increasing the efficiency. I would be interested in hearing yours too as well Oleg. I think trying to measure facts and figures and collect data is the most exciting thing after the (hopefully) improved performance of installing a new part.
All in all though it should be fairly simple to reroute the tube to square ducts in the future if needed...the hard part is now done!
I just was trying something different due to the difficulties with the shape of the AP2 faux ducts/bumper shape etc. I had considered mounting some square ducts on the inside opening where the radiator is, but was thinking perhaps the hoses would have to be too long and snaked too much. I felt the NACA ducts delivered a shorter straighter path without having to hack up my bumper. I would like to try some measurements with the infared thermometer to see if the ducts do make any sort of a difference, and I do have a couple ideas for increasing the efficiency. I would be interested in hearing yours too as well Oleg. I think trying to measure facts and figures and collect data is the most exciting thing after the (hopefully) improved performance of installing a new part.All in all though it should be fairly simple to reroute the tube to square ducts in the future if needed...the hard part is now done!
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Joined: Jul 2005
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From: West Virginia
A small vertical flap a few inches before the opening of the NACA duct (just like the little flap ahead of the tire) might just do the trick.
If that were true all racing cars would have a small vertical flap in front of their NACA ducts.
The main problem with the underside intakes is the low pressure normally present under a car (what side skirts were invented for). It's not a deep low pressure but it's probably enough to prevent much air flow, but aero can be very counter-intuitive so that's why I suggested some research on your next track day.
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Joined: Jun 2005
Posts: 7,261
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From: The Blue Ridge
Originally Posted by clarkster009' timestamp='[url="tel:1332533532"
1332533532[/url]' post='21537851]
Yeah Rob, Pedro, Oleg, I am not disputing the fact that the front mounted ducts would get more airflow, due to higher pressure on the nose. I am also not saying I know a lot about thermodynamics/aerodynamics, etc. I just was trying something different due to the difficulties with the shape of the AP2 faux ducts/bumper shape etc. I had considered mounting some square ducts on the inside opening where the radiator is, but was thinking perhaps the hoses would have to be too long and snaked too much. I felt the NACA ducts delivered a shorter straighter path without having to hack up my bumper. I would like to try some measurements with the infared thermometer to see if the ducts do make any sort of a difference, and I do have a couple ideas for increasing the efficiency. I would be interested in hearing yours too as well Oleg. I think trying to measure facts and figures and collect data is the most exciting thing after the (hopefully) improved performance of installing a new part.
All in all though it should be fairly simple to reroute the tube to square ducts in the future if needed...the hard part is now done!
Yeah Rob, Pedro, Oleg, I am not disputing the fact that the front mounted ducts would get more airflow, due to higher pressure on the nose. I am also not saying I know a lot about thermodynamics/aerodynamics, etc.
I just was trying something different due to the difficulties with the shape of the AP2 faux ducts/bumper shape etc. I had considered mounting some square ducts on the inside opening where the radiator is, but was thinking perhaps the hoses would have to be too long and snaked too much. I felt the NACA ducts delivered a shorter straighter path without having to hack up my bumper. I would like to try some measurements with the infared thermometer to see if the ducts do make any sort of a difference, and I do have a couple ideas for increasing the efficiency. I would be interested in hearing yours too as well Oleg. I think trying to measure facts and figures and collect data is the most exciting thing after the (hopefully) improved performance of installing a new part.All in all though it should be fairly simple to reroute the tube to square ducts in the future if needed...the hard part is now done!
Just sayin'
Thread Starter
Joined: Mar 2005
Posts: 5,662
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I followed Robs directions too. There was no trouble, except the AP2 doesnt have the same faux brake ducts like that AP1 that allow for a 2.5" hole cut. I didn't really want to cut a hole into the painted part of the bumper so I chose this option.
Joined: May 2007
Posts: 2,688
Likes: 1
From: Arlington, VA
A small vertical flap a few inches before the opening of the NACA duct (just like the little flap ahead of the tire) might just do the trick.
If that were true all racing cars would have a small vertical flap in front of their NACA ducts.
The main problem with the underside intakes is the low pressure normally present under a car (what side skirts were invented for). It's not a deep low pressure but it's probably enough to prevent much air flow, but aero can be very counter-intuitive so that's why I suggested some research on your next track day.