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Tracking / Autocross / HPDE / Drifting What these cars were built for! |
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08-20-2019, 12:16 AM | #1 |
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Trackspec vents vs Varis vented hood?
I'm curious if there is any actual track data comparing which hood does the best job of cooling and reducing lift? I'm guessing no but thought it might be worth bringing up.
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08-20-2019, 01:09 AM | #2 | |
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http://trackspecmotorsports.com/shop...ood-louver-kit Some GT86 drivers we've supported in some of the hotter parts of the world. Popular vented hood setup vs. Trackspec vents vs. OEM hood. https://www.counterspacegarage.com/b...its-data-2017/ TL;DR - works better than advertised. Come out to your local 86CUP event to check out the hood vents. |
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08-20-2019, 01:20 AM | #3 |
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Trackspec > Verus
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08-20-2019, 03:52 AM | #4 |
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I'm talking about a Varis vented hood not verus/velox vents on a stock hood. Kind of confusing I know. Anyway I have a Varis vented hood with naca duct on order and I have friends with Trackspec vents so maybe we can do some kind of comparison.
http://www.ft86club.com/forums/showthread.php?t=119879 |
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08-20-2019, 08:52 AM | #5 |
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A vented hood (as opposed to a hood with vents installed after) will always look better. A lot more expensive though
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08-20-2019, 11:46 AM | #6 | |
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08-20-2019, 12:26 PM | #7 |
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Hey Mike, I have a couple questions:
1. The Trackspec website says, " We saw an average of a 43% reduction in underhood pressure (lift) over the area of the hood." Can you quantify that some other way? Maybe in pounds or something? 43% is an impressive figure, for sure. But if that is 43% of five pounds, it's not very meaningful in terms of lift reduction. I certainly expect it to be more than that, but it is worth asking. 2. I'm surprised there are no wickers on the Trackspec vents. I expect this is a deliberate design decision as opposed to something simply overlooked. What can you tell us about this?
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Last edited by Pat; 08-20-2019 at 12:45 PM. |
08-20-2019, 01:06 PM | #8 |
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Either is fine.
Trackspeck allows u to keep ur hood, stock hood is lighter than most CF hoods as well, cost effective functional low maintainence rigid proven. If u gunna have a varis kit than the hood will go well with it. |
08-20-2019, 01:40 PM | #9 | |
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The Varis hood is great, but the TS vents are more functional due to their sheer surface area, assuming proper placement. Note that the Varis hood and recommended TS placement are virtually identical. |
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08-20-2019, 01:51 PM | #10 | |
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1a the best litmust test is the complete elimination of hood flap at highway speeds. 2. the first vent is effectively the wicker, but in this case, we are releasing pressure, not sucking air out, so a wicker would still not have a meaningful effect. On a different application, the wicker may be much more important. |
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08-20-2019, 02:39 PM | #11 |
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How is the first vent effectively a wicker? There is no vertical element in front of it creating a low-pressure zone.
Yes, pressure is being released. But wouldn't sucking the air out be even more effective? A reduction of 120 pounds to 200 pounds at 150 MPH is a LOT. I'm really surprised at those numbers. Very impressive. I found a good article explaining the basics of some of this here.
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08-20-2019, 03:09 PM | #12 | |
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Sucking air out would in theory work better, but really only affects the front-most part of the flow. Pressure differentials are what create the airflow, and is similar to the engine fans doing little to nothing at speed in most cars to cool the radiator. The contribution of the fan, or wicker in this case, is negligible compared to the rest of the system. It's like blowing into the wind in a hurricane; you'll have a little bit of flow change locally, but as a system, no real net effect on how the wind is blowing around you and where the air is flowing. This isn't a cost saving measure either; from a manufacturing standpoint, it is only one extra bend and 2 extra tiny cuts. The manufacturing is already automated. |
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08-20-2019, 05:14 PM | #13 |
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I'm really trying to keep my car as stock looking as possible. From the rear you wouldn't know it was modified. From the front that's becoming more difficult but I figure a painted Varis hood will stand out less than the Trackspec vents.
Other than that I will literally burn my hand on my stock hood with Velox vents. I went with the FRP hood with naca duct from Varis because I'm painting it anyway and was told it would still be lighter than the stock hood. Also really like that the Varis hoods come with a reinforced hood latch so additional aero latches aren't necessary. I know I've heard that the Trackspec vents are actually suppose to increase the rigidity of the hood but that has not been my observation. Last time I saw one on a buddy's car and it was propped up, a moderate breeze was causing the hood to flex and looked like it wanted fly away like a kite. Lets just say it wasn't confidence inspiring that the vents improve the structure of the stock hood. |
08-20-2019, 06:51 PM | #14 | |
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