What cold air intakes are better?
02-26-2010, 02:34 AM
#31
2nd Gear Member
Join Date: Sep 2009
Location: So Cal
Posts: 205
i'll take this chance to ask a quik question: I have the drop-in Air Hog filter and right now it's filthy!!! Last time I washed it with pressure, let it dry in the sun, and put it back in. Is this okay to do? Im thinking this is wrong because I think there is a special oil that I must put on the filter to restict dirt from going in. ???
02-26-2010, 07:17 AM
#33
5th Gear Member
Join Date: Sep 2009
Location: KY, was MA
Posts: 2,797
WD-40, hair dryer, and a screwdriver or any leverage utensile works great lol
02-26-2010, 10:53 AM
#34
4th Gear Member
Join Date: Apr 2008
Location: New York
Posts: 1,306
Even with the largest aftermarket TB, the BBK 78mm (~3inches) the JLT is over kill. However, what I think we've not taken into account is the parasitic drag along the walls of the tube. The stock one has ridges which will cause turbulent flow. So with the JLT the smoothness will help but remembering that the air is not moving along the walls of the intake. So basically we need a larger pipe then the smallest point in the line. Also its better to have the MAF during a straight portion of the pipe vs a corner right before or after (air will be more turbulent then a straight portion of the pipe).
However the forces of drag I'm taking about are minimal thus the gains on an intake is only equal to 1-2 hp at a high rpm, which the air would be moving at the fastest velocity and where the kinematic drag is proportional to the squared velocity... The filter would be the most restrictive, of course you could measure this with a vacuum gauge and datalog are different loads and rpms to see the difference between stock, stock w/ K&N and JLT with K&N and see if its worth the reduction in pressure.
What wasn't mentioned also is charge velocity of the air, its like the momentum of the air. This is why on a N/A 2v 4.6 the optimal TB is a 70mm, but i wont get into that
I'm a mech. E as well, only have a few months left till graduation
However the forces of drag I'm taking about are minimal thus the gains on an intake is only equal to 1-2 hp at a high rpm, which the air would be moving at the fastest velocity and where the kinematic drag is proportional to the squared velocity... The filter would be the most restrictive, of course you could measure this with a vacuum gauge and datalog are different loads and rpms to see the difference between stock, stock w/ K&N and JLT with K&N and see if its worth the reduction in pressure.
What wasn't mentioned also is charge velocity of the air, its like the momentum of the air. This is why on a N/A 2v 4.6 the optimal TB is a 70mm, but i wont get into that
I'm a mech. E as well, only have a few months left till graduation
02-26-2010, 01:12 PM
#37
6th Gear Member
Join Date: Oct 2006
Location: Texas
Posts: 10,551
Who cares how they look n e ways, do you drive around with you hood open? Whats there to see anyways other than a stock 4.6 with a big *** piece of PVC.. awesome
02-26-2010, 11:44 PM
#39
5th Gear Member
Join Date: Sep 2006
Location: CA
Posts: 4,039
Some lube is always a good idea tho. I was simply stating that it takes some persuasion to get in on a larger than stock TB.
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