11-12-2022, 07:47 PM | #1457 | |
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@NoHaveMSG: Yes Sir!
Quote:
https://www.instagram.com/reel/Ci5rd...d=YmMyMTA2M2Y=
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11-12-2022, 09:25 PM | #1458 |
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LS swapped street legal in Germany? o_O
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11-13-2022, 03:32 AM | #1459 |
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11-13-2022, 03:46 AM | #1460 |
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Hood vents, a rear wing and a splitter.
Not a giant one, but definitely something that attaches in the middle. Rear wing is more for lateral stability than downforce. Angle of attack does matter. |
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11-13-2022, 04:50 AM | #1461 | |
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For the splitter, what exactly is meant with "attached at the middel"?
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11-13-2022, 10:12 AM | #1462 |
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seems to me that the way the underbody panel is made, it could be acting as a parachute for any air funneled through the drive shaft tunnel. how does that air get out of the back bumper?
also, have you tried running without a hood? that would help to determine if the hood venting/aero is what caused the front end lift at 200mph.
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11-13-2022, 12:52 PM | #1463 | |
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But imho you overestimate parachuting impact/drag. Think of how vertical spoilers on back of some cars can work, or that many airplanes don't have doors completely closing off retracted gear, and still don't have much extra drag due that. Also i'd certainly wouldn't aim to close airflow completely. There is reason why many aero part makers often leave some openings by design in underbody panels - for example to cool LSD diff. If there are products like casing with extra cooling ribs or even external radiators for diffs, no cooling might be wrong choice. |
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11-13-2022, 02:54 PM | #1464 |
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Based on my tuft test results the area above the rear diffuser is not pressureized. Some tufts was beeing sucked through the gap between rear fog light and bumper. So the pressure infront of the rear bumper is lower then behind. The idea was to use the exhaust flow as a kind of ventury style suction thing. Dont know If that works or If it is simply caused by the low pressure region of the diffuser which, unfortunately, is connected to the area above the diffuser due to the necessary exhaust cutout.
Anyway, Im planung to close the undertray to a flat floor as far as possible. There will be NACA ducts needed to cool converters, tranny, differential and driveshaft. As well the cutout for the exhaust besides the differential has to stay. There is simply not more room and this is only a 3" pipe. Im planning to go for a 3.5" pipe since I have very high gas velocity in the exhaust. Only thing I will be able to optimize in that area is the opening directly under the differential. This will be closed in a future revision of the diffuser. How exactly is not clear yet. Im considering to weld cooling fins to the lower side of the diff housing which lower edges are flush with the diffuser plane. This, at the same time, could act as an air vent/exit for the NACA inlets upstream in the tunnel.
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11-14-2022, 02:53 AM | #1465 | |
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P.S. speaking about aero mods .. - what do you think of round covers for wheels faces to smoothen flow/reduce drag? (IIRC some porsches had such). I'd also think of reducing drag by mods to some smaller bits, like side mirrors/antena. |
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11-14-2022, 09:30 AM | #1466 | |
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The only thing that caught my eye was the vortex generators on the central section of the diffuser. I hadn't seen that before but am not versed well enough to know if it's good/bad.
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11-14-2022, 05:22 PM | #1467 | |
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11-15-2022, 04:34 AM | #1468 | |
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@NoHaveMSG Concerning Vortex generators: they wasnt my inital Intension, but they are necessary. You See that bent half way Up the middle diffuser tunel? This is die to space requirements for the muffler,so it Can't bei erased. Die to that bend the AOT of the rear section is Higher then intended and actually tuft test proofed that it is too high to keep airflow attached. Therefore I was forced to introduce VG's to re energize boundry air layer. Tufts now are still flikering due to vorticees caused by VG's, but they are at least poonting to the rear of the car and Not, as before, Vice versa. Edit: Just remembered that I also Made a video of the tests.
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