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Guest Message by DevFuse

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making functional a non-functional hood scoop

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7 replies to this topic

#1 crazyeric


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Posted 14 October 2003 - 05:28 PM

my 99 OBW has the big ridiculous non-functional hood scoop. I was looking at the hood, and theres a plasic plate with screws that could be removed, opening up the scoop. Then i got to thinking how i could either modify my airbox or find a different airbox thats more or less open at the top allowing air to be forced into the throttle body. Has anyone tried this out? I know id have to relocate my MAF sensor. and someone on another board told me that the 99 model MAF is kind of flimsy. I think i would gain a few horses by doing this mod, also it would allow cooler air to be forced in, rather than warm engine-compartment air just being sucked in by the TB. Has anyone tried this or know how i might be able to go about it or am i just wasting my time? Thanks alot, Eric.

#2 gbhrps


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Posted 14 October 2003 - 06:13 PM

I don't want to rain on your parade, but I recall my 97 OBW drew its air from inside of the passenger fender well, up near the grill, not from the hot engine compartment. As well, I recall asking a Subaru technician about why the air box plumbing went all different directions and even had two sections of 2 inch diameter plastic pipe that extended about a foot and just stopped. He replied that they were designed to deliver or eliminate (duh, I can't remember) air pulses to the throttle body, or something like that. You may be creating a problem by eliminating them. Do some research first! And what about all of the water that you'll suck into that opening?

#3 North Ursalia

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Posted 14 October 2003 - 07:49 PM

The hood scoop is not and never was intended to be an air intake- the Subaru is not a Chevy or a Pontiac ;). It was meant to ventilate a top mount intercooler- granted, there is no turbo nor TMIC on your car, but it still can function to ventilate your engine bay, just remove or space the blocking plates away from the hood:

Posted Image

The heat forced out of the vents was enough to melt the shell of ice on my RS :-).

#4 crazyeric


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Posted 14 October 2003 - 08:18 PM

oh well, it was worth a shot!

#5 Legacy777



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Posted 15 October 2003 - 08:27 AM

Other thing you could try is turning your hood scoop around. with the vents open underneith this would help draw hot air out of the engine bay.

I think on some models this can be done relatively easy. Others the hood scoop only goes in one way.

#6 Dave K

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Posted 15 October 2003 - 12:44 PM

I THINK those tubes serve the same purpose on the Soobs as they do on my Z28... and that's as an intake silencer. It keeps the whistling noise down by using a tuned column of air. Took mine off of my Z28 when I installed an electric water pump, intake is a bit louder but no other effects... and I have a laptop plugged into that car all the time so I'd have seen any significant changes to MAF or MAP.

#7 Setright


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Posted 15 October 2003 - 03:52 PM

Turning the scoop may not change it's function. There is a high pressure region ahead of the windscreen base, because air is "bunching up" on it's way over the car.

The scoop would probably still force air into the engine bay.

#8 North Ursalia

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Posted 15 October 2003 - 06:02 PM

It won't fit backwards without custom work either ;).

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