IW STi Forum banner

Anybody swap the Sti's hood scoop for a smaller WRX piece?

6K views 17 replies 17 participants last post by  RecceRS  
#1 ·
The Sti hood scoop is huge. Anyone swap the Sti hood scoop for a smaller standard WRX scoop? The Sti piece is just SO big. Even the WRC car doesn't use a scoop that big. Would it be a direct swap or do you need the extra space under there to clear the intercooler? I can't imagine that the smaller piece would make a measureable difference in IC cooling. Should be neglegible. But it would make it look way cleaner to me. Anyone thought about this?
 
#5 ·
thermobox said:
even the 04 wrx's have the new and improved scoop.
The shape is similar. The size is smaller.

Select the image of the wrx hoodscoop (2nd image):

http://www.subaru.com/servlet/resea...vlet/research?track=shopleftnav_pa3&trim=WRX_SEDAN&model=IMPREZA&command=photos

And then the one of the sti hoodscoop (3rd image):

http://www.subaru.com/servlet/resea...rvlet/research?track=topnav_pa3&command=photos&model=IMPREZA&trim=WRX_STI_SEDAN

Not the same scoop. Not the same TMIC either though.
 
#7 ·
But the larger scoop could also be simply a styling/marketing feature (like the coat hanger wing) to differentiate it from a standard WRX. Who's to say that the Sti HAS to have the larger scoop? Suggesting that it NEEDS the large scoop to keep cool is speculation. Maybe it does. Maybe it's just marketing. I'd like to see some data showing higher IC temps or lower hp numbers using the smaller scoop. Or something that shows the Sti needs a larger volume of air in relation to speed for the IC to be effective.

That brings me to another point. Speed effects how much air get blown over the IC WAY more than the size of the scoop. The difference between the two with regards to size is maybe 30%. But the REAL variable is forward speed. An Sti flat out on an auto cross course is not getting nearly the air that a standard WRX is getting on the open road, even with the large scoop. My point is, that unless you are doing a LOT of WOT slow speed driving (a la Solo II), then you should get sufficient air through the smaller scoop. Plus I think it would look nicer.
 
#8 ·
Mr._Tarmac said:
But the larger scoop could also be simply a styling/marketing feature (like the coat hanger wing) to differentiate it from a standard WRX. Who's to say that the Sti HAS to have the larger scoop? Suggesting that it NEEDS the large scoop to keep cool is speculation. Maybe it does. Maybe it's just marketing. I'd like to see some data showing higher IC temps or lower hp numbers using the smaller scoop. Or something that shows the Sti needs a larger volume of air in relation to speed for the IC to be effective.

That brings me to another point. Speed effects how much air get blown over the IC WAY more than the size of the scoop. The difference between the two with regards to size is maybe 30%. But the REAL variable is forward speed. An Sti flat out on an auto cross course is not getting nearly the air that a standard WRX is getting on the open road, even with the large scoop. My point is, that unless you are doing a LOT of WOT slow speed driving (a la Solo II), then you should get sufficient air through the smaller scoop. Plus I think it would look nicer.
You make some valid points. Since Subaru has not (to my knowledge) provided actual testing data for the wing or the hood scoop, one can only speculate. But common sense tells me to leave the scoop alone.

I'm not sure how long you've had your car but I felt the same way you did when I purchased my car last May. But the more I drive it, the more I like and appreciate every odd thing about it. And if you AutoX, then you will see how comfortable the car looks and drives around the cones.
 
#11 ·
New Gauge Cluster

Mr._Tarmac said:
I'd like to see some data showing higher IC temps or lower hp numbers using the smaller scoop. Or something that shows the Sti needs a larger volume of air in relation to speed for the IC to be effective.

Just as a matter of thermodynamics, you'll automatically have higher IC temps AND lower HP by doing this, even if you're not driving it hard. It might not be a large difference, but it will be there. I've heard that the intercooler gets heatsoaked pretty easily too, so it's probably not a good idea....
 
#12 ·
RemlapaN said:
if you want to get rid of the scoop that badly, get an APS FMIC, and a standard impreza hood... Removing the scoop on the STi should be illegal... its like wanting to remove the BBSs for steel wheels with plastic hubcaps :eek:
as long as you buy the SPINNER plastic hubcaps at walmart, theirs no problem with hubcaps :wink:

But i wouldn't remove the tmic if you dont have a fmic
 
#16 ·
Location

Mr._Tarmac said:
But the larger scoop could also be simply a styling/marketing feature (like the coat hanger wing) to differentiate it from a standard WRX. Who's to say that the Sti HAS to have the larger scoop? Suggesting that it NEEDS the large scoop to keep cool is speculation. Maybe it does. Maybe it's just marketing. I'd like to see some data showing higher IC temps or lower hp numbers using the smaller scoop. Or something that shows the Sti needs a larger volume of air in relation to speed for the IC to be effective.
What you are saying could be true. But are you willing to take that risk?

There are two reasons why althought what you said could be true, I would have to disagree with you.

1. If the smaller scoop could be used for the same performance. Why didn't Subaru simply used the smaller scoop and cut cost there, instead of making a limited set of larger scoops? Everything else on the car shows that Subaru cut cost on style (form) and focus on performance (function). For example, Subaru decided to not include a stereo but kept DCCD.

2. If the bigger scoop is just for looks, is the intercooler water spray just for fun? Are you also telling me that the water spray isn't there for function? You can't see it, so it's not for styling . . . I guess people really think its fun pushing that button. Gee . . . Subaru rather pay more for the light-weight windsheild rather than loosing the ?? gallon water spray tank in the trunk. Personally, I don't believe that is the case. I believe the large hood scoop is not sufficient for prolonged periods of WOT or on a demanding hot day. The water spray is needed in additional to the larger airflow through the larger hood scoop.

Of course, my reasoning may be as big of a speculation as yours. But I choose to believe my reasoning, not because it my reasoning, but because I'm not willing to take the risk of your reasoning.

Chieh