After watching the hood of my STI dance around on the freeway yesterday I have a question

Has anyone tried a true cowl hood (not the Kaminari) on the Impreza?

I come from a muscle car background, and on something like say an early Camaro, a Cowl hood is much more aerodynamic and efficient than a hood scoop. The idea is that the engine compartment is a low pressure zone and the windshield is a hi-pressure zone so cold air is drawn into the engine compartment.



Has anyone tried this??

 

i was under the impression that you would want to force air into the intercooler not draw it in, hence the hood scoop. i think that with a cowl hood you would get poor intake temps and hinder the performance of your engine.

 

i havent seen anything like this on a subaru, but the point of a hood scoop is for the air to flow freely into the intercooler as kenaye said. post pics if you do it tho

 

the pressure is nuts at the bottom of the wind shield it would be forced in like the hood scoop

the problem i see is the TMIC is square so i dunno how you are going to duct it. The air filter is in the same place but its round and the TMIC is square

 

Hmm Maybe I could reverse shim the I/C Would have to play with tubing, but may be worth it??

 

how fast were you going?

 

85-ish

 

and you could see your hood moving around at 85? Is it stock or CF?

 

At higher speeds, I think anything over 40mph, the hood scoop does nothing anyways...

 

It was the scoop moving, not the whole hood.
It's a stocker

 

hmm thats crazy.. ive never seen mine move at all, regaurdless of the speed

 

I seem to remember somebody putting the scoop on an sti backwards in one of the car mags I read a long time ago. can anyone back me up on this?

 

get hood pins

 

High pressure does not equal high velocity. Cowl hoods are great at venting the highpressure under the hood from the air rushing into the grill and the air accumulating under the front of the car. you would need a cowl hood that effectively grabs all the high pressure air at the base of the hood and funnels it into a smaller orifice to accelerate it enough so that it will push through the intercooler fins. As far as venting the heat from the intercooler with a cowl hood one has to consider what air ispassing through it and from where. Example: if you put your scoop on backwards(if it fit), at speed there would be a venting of heat because of the draw of air from the backwards scoop. That air going out is air that has already travelled past the radiator, ac condenser, and various other hot items under the hood, it will not cool as well as air that is coming in from outside directly.

 

yeah a guy in SCIC did i t


he had a FMIC so it was useless anyways