noodels

Many people telling others that lid off makes the car better perform here is the evidence in Black and white...<ok colour as well >
I Have a Snorkel CAI airbox mod with Cosworth filter <with lid on>
Quote:
Quite the opposite, removing the lid cost a ton of power. In just doing 3rd gear pulls going from about 3700rpm to 7800rpm, the time required increased from ~6.3 seconds to ~7.6 seconds. You can see this was repeatable too as two runs were done for each

http://www.motoiq.com/MagazineArticl...ng-Faster.aspx

fatbaldboy

Loved the synopsis:

"Removing the air box lid will make your car much louder making everyone look at you. Removing the lid will also reduce your power significantly giving everyone more time to look at you..."

richmc

Do a search Noodles, plenty of reference to lid off = loss of power, it's just for noise.
Have you tried perching the lid over the clips to give a 5mm gap to see if the loss is the same?

senninha1994

Taking the airbox lid off will give you better sound, but you are effectively changing it to a 'warm' air intake.
All of the air going into the filter will be from the engine bay which is warm/hot so reducing the performance.

If you want the sound and maintain performance get an intake kit (K&N or AEM for example).

fatbaldboy

So would a reflective airbox/airbox cover help keep the air inside a tiny bit cooler?

Like wrap it in tinfoil (...not literally).

senninha1994

You need to 'feed' it cold air, wrapping the airbox with reflective material might reduce it slightly.
I have an AEM v1 cold air intake, the filter is located in front of the driver side front wheel in the bumper space (effectively behind the fuax vent in the bumper).

The problem with the stanadrd airbox is that it is behind the radiator so it gets a lot of heat soak.

daz05

When you take the lid off its probably not a bad idea to replace the piece the directs air into the box as the lid has the old piece attached. When I ran mine like this I couldn't detect any noticeable difference.

Dillon_93

So in essence a K&N will soak up just as much heat as its open in the engine bay, am I right in saying this? I say this as id like to know as I run a K&N.

senninha1994

Do you run the K&N Typhoon? It could do with some ducting to 'push' some cold air into the area of the filter.
I have seen a typhoon with some silver stick on heat shielding around the 'box' surrounding the air filter, it should in theory reflect some of the engine bay heat.

daz05

K&n is better than lid off as it's a little further over away from the main source of heat, has more shielding, seals against the bonnet and is better positioned to take more air in.