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Originally Posted by Fancy
It's the Seibon DV style hood. I bought it from Evasive Motorsports and it was right around $815 shipped
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That's one seriously cool hood!
Quote:
Originally Posted by Basti
Dunno whether this comes up much butI've heard of this issue several times already:
Upon reaching more "interesting" speeds, the hood starts to lift slightly. Well, it's still hinged safely in place but when it happened to me on a particularily even strip of highway I got shaking from that interference and driving above that speed neither felt reassuring or safe anymore.
I guess it started at about 180km/h.
Now I know that I'm kinda spoiled when it comes to anything aerodynamics-related but this is just wrong.
Knowing the physical background of this phenomenon I want to try and fix it.
Before carving vent ducts into the hood I'd favor opening those sharkfin side panels the BRZ generously already provides.
I'm thinking of opening the fake plastic... "mesh"... , exchanging it w/ the real thing and then installing a kind of tunnel to the engine compartment. I hope that this will relieve the difference in air pressure created by air being forced into the engine compartment.
That should equalize the pressures at least enough th make 200km/h w/o trouble.
However, does any1 know whether it'd be possible to create such a venting system? I don't know how the area behind the side skirts looks so any insight would be appreciated. Also, if you've already solved said issue, let me know.
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I would really like to see what you come up with. Aero is very important and lightweight hoods tend to move around a bit. It is probably safe from a functional standpoint, but the distractions it causes the driver could be problematic. You could try the aero latches mentioned in association with the aftermarket carbon fiber hood above. This should result in a more stable setup with proper installation.
One of my favorite aero stories:
I had just bought my 1999 BMW M3 (used) and brought it to BIR (Brainerd International Raceway) to stretch its legs. I noticed that when I went over 120 mph going into turn 1 (full track), the front end would get light and have very little steering control. I compensated by backing off the throttle to go through turn 1, but I couldn't find the cause for a day and a half. Then near the end of the event, I found that the plastic under tray was cracked, so that at speed a piece would pull down, scoop up air and blow it into the engine compartment. Can you say lift?
(I think that this is essentially what is happening to our FR-S's, air is trapped under the hood, but from the radiator inlet instead of a broken plastic part.)
After the event I installed an aftermarket aluminum under tray. Problem solved; I was able to reach the speed limiter at 136 mph in turn 1 next time I was up at BIR and the car was rock solid stable.