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Forced Induction Turbo, Supercharger, Methanol, Nitrous |
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09-14-2015, 02:16 PM | #15 |
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the further back you can get the vents the better they will work. You want them close to level otherwise air will build up on the rear slat of each vent and choke off the vent in front of it since its a flat plane. Mounting over the belts works with vents that have less fins and more negative drop from the hoodline plus some ducting from the radiator up. not possible with my front mount turbo. you can see in the pictures my turbo is still pretty close.
heres some wind tunnel testing of closer spaced vents moved further forward and why i chose the current design/location. In the video you can see the front vents on the gtr dont do anything. Thats because the vent angle is too steep causing air to "pack up" on the slat behind each vent. The rear vents are at a much shallower angle. The same angle as my trackspec vents in there current location and function much better.
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09-14-2015, 04:19 PM | #16 |
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how are these in the rain? Do they have some sort of rain guard?
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09-14-2015, 04:42 PM | #17 | |
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09-14-2015, 05:33 PM | #18 |
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why would you use a rain guard? you do realize an engine compartment has a GIGANTIC hole in the front that water comes through at 65mph when driving in the rain right? The only drawback to a vented hood is if your coolant overflow tank burps(if its over filled) it comes out the vent.
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09-14-2015, 08:25 PM | #19 | |
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The GTR as pictured in the video has a very small low-pressure area at the front of the hood, so that would explain the video. But some cars have a larger low-pressure area at the front of the hood: I do admit that the hood shape of the twins shares more with the GTR than the GC Impreza however. |
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09-14-2015, 08:29 PM | #20 |
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30*F ambient temp drop!?! Any difference in IAT's or fluid temps since in isn't an oven anymore? I'm all for this but, really I only think this will look good on a full track car or a twin of darker color like yours.
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09-14-2015, 10:31 PM | #21 | |
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09-14-2015, 10:38 PM | #22 | |
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I honestly didnt log as much as i usually do last track day. its all subjective since it was a different track with different weather conditions. you would have to run back to back on the same track same day. But running a 450hp turbo frs in the south and not having cooling issues hot lapping it is doing pretty well. I have a completely stock cooling system minus the oil cooler. temps were 200 water 230 oil running 20 minute sessions hard enough to destroy a set of tires. If there's enough interest ill tape them off next test and tune day. I also have the capability to do thermal imaging but its kind of a hurdle to set it up. Ill get around to it though this winter. Also hopefully wind tunnel time soonish.
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09-15-2015, 12:00 PM | #23 |
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I love this idea. Was trying to figure out a good way to vent a top mount oil cooler and this looks like it will work and far more cost effective than a CF alternative. Just need the balls to cut the OEM hood.
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09-15-2015, 01:54 PM | #24 |
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Any pics of the underside? Thanks.
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09-15-2015, 02:30 PM | #25 |
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I like it. I was also looking to do this at some point and was looking for a manufacturer of such vents.
BTW, is a rain cover available? If it is, it would seal the deal for me. I want to leave the rain cover on for street use and take them off for track days. |
09-15-2015, 03:15 PM | #26 |
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Those look awesome and saves me some money on buying a vented carbon fiber hood. BTW the s2000 vents are on their websute now.
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09-15-2015, 04:49 PM | #27 | |
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Doooo iiittt.
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09-15-2015, 09:40 PM | #28 | |
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We have done CFD testing for the FT86. We do not have the funds for proper wind tunnel testing so results have not been verified by this route. However, on the track, we have seen the real word results. Also I have backed up many CFD cases to other CFD houses and windtunnels. Three examples are the ahmed model, DrivAer models, and the Perrinn LMP1. I will now get off the boring information and get to the CFD of the FT86. Pressure Plot on the car, specifically the hood Pressure Cut Plot offset from the center line of the car Iso Surface around the car showing lower pressure |
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