Since I jsut bought my Charger today for the past week I been looking at parts and so on. I think I got alot down pat. But one part boggles me and I would like more info on it. First off I am purchasing the SRT8 Hood with Scoop (for the looks mainly) but I found out you can have a functioning Ram AIr unit. What will the ram air help with? And could it be properly installed on the R/T 5.7 Hemi Model. or am I waisting my time.
TIA
EZ-Dozet
thunder63cs
02-25-2006, 10:28 AM
yea it should be able to be installed no problem because the airbox is in the same spot for both. A ram air will forse more air into the engine as you are driving down the road. It will not help at a stop. There is not really any way od dynoing it to see the gains because a dyno is stationary adn for it to work you need to be moving to force the air in. hope this helps some.
HankL
02-25-2006, 12:07 PM
an old Ram Air post from another list:
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Heard of the 'Ram Air' effect where the speed of the air hitting the vehicle
builds up pressure in a forward facing air duct and helps 'supercharge' your
engine a bit. ?
Well, at 'typical' street speeds the effect is very very small.
The formula for that is:
Inches of water pressure from Ram Air = (mph) times (mph) divided by 2025.
So at 70 mph the ram air effect is:
(70 mph) times (70 mph) divided by 2025 = 2.4 inches of water.
So the very best possible air inlet tube designed for Ram Air would actually
have a positive pressure of 2.4 inches of water.
How much pressure is an inch of water ?
One psi of pressure is equal to about 28 inches of water.
You can get this by dividing the cubic inches in one cubic foot ( 12 x 12 x
12 ) by the weight of one cubic foot of water ( 62.4 lbs).
The air pressure around us is averages about 14.5 psi at typical heights above
sea level.
So another way of looking at it is that the air pressure around us is about
400 inches of water. ( 14.5 x 28).
So the best Ram Air system at 70 mph gives you a boost of about 2/400 or one
half of one percent. Small.
Ram air started in airplanes where it means more. An airplane going 300 mph
gets a boost of:
300 x 300 divided by 2025 = 44 inches
This is a percentage boost of 44/400 or about 11%
Want a challenge?
Consider your tires.
Some strange facts:
At 70 mph the center of your tire is moving 70 mph.
The bottom of your tire where it 'grabs' the pavement is moving at 0.1 mph
The top of your tire is moving forward at 140 mph.
If you could put a 'Ram Air' inlet right at the top of the tires (where it is horribly dirty and wet) you could get a significant air pressure boost.....
