Car is a 2005 Evo 8. All runs was done with a big fan in front of the hood, temp at around 60 degree.
1st run: Hood open
2nd run: w/o resting the car, just closed the hood.
3rd run: 10 minutes rest.

Interesting...

I say/type BS since you have a red X

I saw it before it went down, it lost about 5hp and about 10ft lbs of torque.

Why is this Important? Who will it help?

Should we run our cars without hoods @ the drag strip.(Dont think you can)

Do like some Civics I've seen a put spacers in the hood bracket to allow a gap and allow more air inflow...

Well you can take a headlight out at the track but im not taking my drivers side headlight out. i dont see it really helping.

The point is that gains seen from an intake on the dyno are not 100% factual, since the hood is closed while driving, and an open-element intake is sucking in hot engine air instead of cold external air.

Wow, the only smart one here. Well, the OP too. This debate has been going on forever and everyone in this thread missed the point! Glad to see someone actually tested it, and now we see that all the theories were true. Good post.

Bingo!

The test should have done with stock intake VS aftermarket with hood closed both. opening the hood helps the engine and many things like intake mani to cool also. It is obvious that it will make more power with hood open.

well of course using a fan with cool air is gonna do better

I wonder if this also applies on a dyno tuned car, that would suck if you made 350 on the dyno but can't put down the same on the street.

As far as stock intake against open intake there are too much variables imo, such as how the car is tune. I think if the car is tune with the stock intake then it will lose hp on a open intake, vice versa.

Somebody needs to test it though. I would not trust any tuner doing this test just to sell their product or their favorite product.

I still think that once you reach Highway speeds, the under hood temps lower quite a bit. Especially with that vent on the Hood, the ari just come in from the front and under the car and then out through the vent. It may not be as good as an open hood but not as bad as a closed hood not moving along with a heat soaking FMIC and so on.


Read this thread too, there was a guy who measured the temps at speed, he found them to be ALMOST ambient. https://www.evolutionm.net/forums/sh...d.php?t=199834


I say the Dyno runs are accurate at speed.

Somewhat true, although at freeway speeds and even lower air is flowing enough to get alot of that hot air out and some cool air in..