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05-10-2009, 11:25 PM | #89 |
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Really not trying to be rude. My first correction of your statement was definitely not rude. However, even after the correction, you wanted to stick to your guns and called the terms interchangeable. Although I still would not call it rude, after that I did become firmer in my pointing out of your error. I'm simply a stickler for correct technical information and science in the discussions here. It really is not my standards, it is right or it is wrong on certain matters. Don't let anyone keep you away from the board, if you like reading and or posting keep doing do. Cheers.
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05-11-2009, 12:12 AM | #90 | |
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Its all hypothetical until someone measures something, and that's the tricky bit. |
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05-11-2009, 02:48 AM | #91 | |
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05-11-2009, 03:23 AM | #92 |
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I came across this scoop, which looks promising:
![]() More details here: http://forums.vwvortex.com/zerothread?id=2001569 |
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05-11-2009, 11:27 AM | #93 | |
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We are looking into ways of constructing an accurate mesh for the surfaces of the E92 M3 that affect flow. If anyone knows of such a representation, please let me know. We are planning to run a detailed CFD analysis, and perhaps redesign the front end to introduce downforce and brake cooling. The person I am collaborating with has done this kind of analysis for NASCAR teams, and thinks positive outcomes can be acheived.
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05-11-2009, 11:34 AM | #94 | |
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05-11-2009, 11:39 AM | #95 |
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We'll just paint everything red, and it'll sell like pancakes!
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05-11-2009, 11:51 AM | #96 | |
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rob it would be great to see how you attached it to the shield. whenever you have time, please post some pictures. thanks. |
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05-11-2009, 01:09 PM | #99 | |
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Your contribution has been great and that set-up looks promising. Could you tell us how you connected it to the hub?
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Let me get this straight... You are swapping out parts designed by some of the top engineers in the world because some guys sponsored by a company told you it's "better??" But when you ask the same guy about tracking, "oh no, I have a kid now" or "I just detailed my car." or "i just got new tires."
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05-11-2009, 01:37 PM | #100 |
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It seems like the rear facing part of the shield has a much broader gap. It wouldn't be that hard to bend some sheet metal to act as a cylindrical sleeve for the hose, and fasten the sleeve to the shield with 2-3 bolts. I don't have a sense of the relative dimensions yet, but it might not be necessary to cut the shield.
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05-11-2009, 01:41 PM | #101 |
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This most likely would not work for our cars as the scoop is sitting too high in the wheel well. It needs to dip underneath the car to grab fresh air. Maybe in the VW car there is a vent through the bumper and thus fresh air behind it.
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05-11-2009, 10:22 PM | #102 | |
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As for the air in the wheel wells, my belief is that the rounded notch in the air dam under each headlight creates a vortex that acts as a barrier between the smooth flow under the engine and the turbulent flow around the wheel and tires. If I'm right, then the hot air in the wheel well will get sucked under the car, but through the big hole at the back of the wheel arch. Basically, there's smooth flow along the center of the car and turbulent flow at the sides. The diff cooler hangs down into the smooth flow. If you look at the post with the drawing of the rotor and backing plate, notice that for air to go out through the cooling vanes in the rotor, it HAS to come from the wheel-side, not from the backing plate side. Air from the backing plate side cools the wheel bearing. Air from the wheel side cools the rotor. This design detail of the rotor is part of the reason I think BMW intended to cool the brakes from the wheel side and draw hot air out of the wheel well into the airflow under the car. If you study a BBK rotor, the rotor hat is set up so that cooling air from the backing plate side flows into the cooling vanes in the rotor, the reverse to the factory setup. Now, I'm not sure that this is how it all really works, but if I'm right, the reason for doing it this way is actually to improve "general" performance and fuel economy. It's a good aero solution that meets a lot of goals, but doesn't optimize any of them. Brake cooling will be "ok" but not great. Fuel economy will be good "for a performance car". And so on. The CFD results will reveal a lot about what's really going on down there. I'm looking forward to it! |
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05-17-2009, 05:22 AM | #103 |
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A slightly different question...given that a decent push of the brake pedal can trigger the ABS at 75mph, how much more of a push would be required at 150mph to trigger the ABS?
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05-17-2009, 12:59 PM | #104 | |
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Thousands of pounds of aero downforce (and slicks) is why you can stand on the brake pedal with both feet, exerting about 350-400 lbs., in a racing car at 200mph and not lock the brakes. Those can generate braking forces of over 4g at the higher speeds. As they slow down, the driver has to modulate the pedal to keep from flat spotting the tires. |
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05-17-2009, 05:22 PM | #105 | |
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I have tried hard braking from 100mph, maintaining a constant pedal pressure and noting the rate of deceleration and it did feel to be roughly constant. I can see how kenetic energy fits in with the thermal aspects of braking but is it relevant to braking force and rate of deceleration? |
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05-17-2009, 05:50 PM | #106 |
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Weights of 365/345 mm Slotted Kit
I measured the weights of the kit
365 mm slotted rotor 24.5 lbs 6 pot monobloc front caliper 12 lbs front caliper bracket 2.0 lbs 345 mm slotted rotor 15 lbs 4 pot rear monobloc caliper 8 lbs Rear caliper bracket 1.5 lbs All weights measured on digital scale used for shipping so prob +- 0.5 lbs Last edited by sparkyg; 05-19-2009 at 03:29 PM.. Reason: Updated weights / added brackets |
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05-17-2009, 06:08 PM | #107 | |
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![]() Do the caliper weights include the mounting bracket?
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05-17-2009, 06:40 PM | #108 |
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05-17-2009, 08:12 PM | #109 |
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Yes, please weigh them as well. I would like to know what the net weight reduction/increase would be. (As you know, I am also considering this kit along with the Stoptech Trophy system). Some of the other reported numbers include the stock brackets. Thanks.
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05-18-2009, 12:43 AM | #110 | |
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