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83SILVRADO 04-17-2009 08:18 AM

Cold Air vs Ram Air
Which is better cold air or ram air. which would be better on a 98 camaro z28 ls1? thanks for any help.

curtis73 04-17-2009 08:26 AM

Ram air is a myth. There is no such thing as "ram" air until about 200 mph at which point the scoop becomes more of a drag than the 1psi of pressure adds to the power. cold air is good, ram air is just cold air that is moving.

Ram Air has been tested a few thousand times at Bonneville. There is a constant balance happening between additional drag and additional power added from ram air... but these guys are travelling at 250 mph. At the 120 mph that you might see once every few months, there will be absolutely no benefit to ram air.

83SILVRADO 04-17-2009 08:29 AM

haha thats what i said.

joe_padavano 04-17-2009 08:29 AM

Several sources (such as the Doug Roe Qjet book) indicate that there's a one HP increase for every 7-10 degree drop in inlet air temp. Unfortunately, most aftermarket "cold air" packages for newer cars discard the factory ducting that really does pull in outside air and replaces it with a cone filter under the hood sucking hot air from behind the radiator. DOH!

curtis73 04-17-2009 08:32 AM

Right, Joe, which is a good case for ram air... not because it rams, but because it definitely gets cool air from outside the vehicle.

But don't call it ram air unless its a Pontiac muscle car :)

72fordlb 04-17-2009 08:34 AM

Jackson when are you getting the camaro to put the cold air on plus we live in tight area we dont get up to speed for the ram air to really work.

83SILVRADO 04-17-2009 08:38 AM

im getting the camaro in about 2 months probably. as soon as i can sell my truck... you should scrape some money together and buy it. :)

72fordlb 04-17-2009 08:39 AM

I would love to buy it but i have a ford truck already. u should post a for sale add on here.

83SILVRADO 04-17-2009 08:42 AM

yeah you have a ford. all the more reason to buy a chevy. haha

ap72 04-17-2009 08:51 AM

"ram air" is not a myth, and if applied corrctly will not increase resistance (it can actaully lower it).

However, most people don't know how to design or tune it, all things being equal though ram air is better than cold air.

72fordlb 04-17-2009 08:52 AM

Ahahahahahah NO!

ap72 04-17-2009 09:00 AM

I'm going to refrain from starting a long pissing match over this, and just ay people should do a lot of reading and research if they wish to design an effective air intake system.

joe_padavano 04-17-2009 09:26 AM


Originally Posted by ap72
"ram air" is not a myth, and if applied corrctly will not increase resistance (it can actaully lower it).

However, most people don't know how to design or tune it, all things being equal though ram air is better than cold air.

As an aerospace engineer, I can tell you that airflow management is a complex and difficult activity. You are correct in saying that it is possible to use dynamic pressure from vehicle movement to increase airflow to the engine. You are not correct in saying that it will not increase resistance, however. You will always have less drag by diverting the air around the body than ducting air into the body. Yes, NASA and the Air Force has been looking at and test flying boundary layer control systems for decades, but so far very little practical hardware has come from that. By definition, "ramming" the air into the engine requires you to slow it, which requires drag. Without the resistance, there is no increase in dynamic pressure.

ap72 04-17-2009 09:58 AM

And if the air is already benig ducted through the body?...

TrentonHuber 04-17-2009 10:19 AM

In most cases, ram air is used incorrectly, it is hard to get air pressure by scooping air it in and then directing it through the air intake. The only way to get good ram air pressure is by directing the air straight to the intake. When you get twists and turns in your hose, it gets hard for the air to compress. So unless your hose is short and simple and your scoop is positioned right, then yes, ram air is pretty much a myth.

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