01-22-2013, 09:02 AM | #57 | |
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The old days before all the neat stuff like active suspension, and sliding skirt venturi tunnel cars sound awesome.
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01-22-2013, 09:46 AM | #58 |
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Random thought. I know a full-on active aero and ride-height (like the McLaren 12C) is beyond the DIY capabilities of our community right now... but say we start with an active spoiler (like the Porsche 911).
Does anyone know of a successful (aftermarket) implementation of spoiler angle modulation based on vehicle speed? I'd like to think that we could either use OBD data or ABS speed sensor frequency to determine speed. A lookup table would provide the threshold values and outputs. A basic stepper motor control would manage spoiler attack angle. If you could "pitch out" at low speeds and in eco-mode, then you could install a monster wing without hurting highway mpg. Similar control could be done on active grille shutters or front aero. Just thinking out loud. EDIT: Jackpot! LINK to Supra LINK to Accord LINK to E36 |
01-22-2013, 11:42 AM | #59 | |||
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01-22-2013, 11:46 AM | #60 | |
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We are working on a proprietary passive system that works purely on air density and vehicle speed |
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01-22-2013, 12:03 PM | #61 |
Curious cat.
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Am I correct to assume that our rear 'diffusers' are mostly cosmetic?
It would be interesting to see the effects of properly sealing off the gap around the rear muffler can using a panel such as the TRD or Borla ones, or even installing a proper venturi-style diffuser which blemds with the underbody. Looking under the car it's pretty plain to see that somebody's done a good amount of engineering work on the design of all the under panels, vents amd flaps etc. Even the radiator is well sealed from the factory for optimal flow (there's little foam pieces surrounding it). Beautiful to behold, and great to have on a car in this price range. Also would seem to be a great starting point for a more elaborate aero setup. Great thread BTW.
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01-22-2013, 02:13 PM | #62 | |
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This static fitment can be upgraded to active as well using our external R.Module. We've also built the active front splitter that you are referring to. We did extensive CFD testing on it, then took it to the WindShear 180mph rolling road wind tunnel where the Nissan Delta Wing was tested. We have some info on it here: http://aeromotions.com/project-cars/...hallenge-aero/ We do implement a Drag Reduction System (DRS) like F1, so that there isn't much of a drag penalty. One thing to note on our BRZ testing: our airfoil is very unique (even though it looks very basic), and implements a concave pressure recovery system which seems to have a huge benefit with the BRZ shape (the window rake + factory deckled specifically). In static mode, we only need 2 degrees of angle of attack (AoA) to achieve perfect balance. And because of our low drag shape and only needing 2 degrees of AoA, there isn't much of a drag/speed penalty. |
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01-22-2013, 02:49 PM | #63 | |
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There is a GT86 and even an AE86 in the Toyota section. I've started looking into building a desktop for this and may have some questions for you in a few months. Thank you very much for sharing!
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01-22-2013, 03:25 PM | #65 |
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They are not. I believe the higher the poly count, the better the surface and the tighter the mesh. However, I am not a fluid expert, that is my partner Paul's expertise. I have sent him a link to this thread and hopefully he can chime in and help out.
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01-22-2013, 08:31 PM | #66 |
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So does this mean any number of the vented hood styles we have seen from Siebon would essentially do the same thing?
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01-22-2013, 08:59 PM | #67 |
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Its hard to say because the vent needs to provide a low pressure zone directly behind it other wise the high pressre air on the hood will reflux into the engine bay. Like allthe people who jack up their hoods at the hinge/cowl...this forces air back into the engine bay.
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01-22-2013, 09:02 PM | #68 |
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Is there anyway to tell purely by looking at the design of the hood or is wind tunnel time necessary?
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01-23-2013, 09:42 AM | #69 | |
i'm sorry, what?
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although the end goal is improved laptimes, so you can dump a wind-tunnel for an accelerometer and a notepad.
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01-23-2013, 12:23 PM | #70 | ||
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I am EarlQ partner. I am the aero guy who does the aero development and CFD. Also looking at purchasing an FRS....
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Correct that cfd is not "real life." It is an experiment with conditions that do not change to get repeatable results. It is in no way 100% and that is a big misconception. However, it can definitely drive quality design changes that drastically improve performance. Most automotive cfd models are very simplified because of computing time and it won't drive design changes on a big scale. How it is set up makes a big difference. I have validated our program and setup using automotive test of ahmed bluff body and a class 8 heavy vehicle (GCM). Both have data from university for validation of setup and program. Also windtunnels are not "real life" either. That is also a big misconception. It is also just an experiment to get repeatable results that represent what is going on in real life (just like cfd). Both are doing the same thing, just in different ways. Not all the models are of the same quality. However, the models still need to be reworked anyways to make them watertight for cfd purposes. If you have any questions on computer hardware or cfd in general, let me know in this thread or pm. I am happy to help :happy0180: |
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