05-04-2014, 02:51 PM | #2 | |
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Although 96F is still extremely hot.
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05-04-2014, 03:23 PM | #3 | ||
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05-04-2014, 03:24 PM | #4 | |
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Piggy and meth, and all those problems r gone but I would not trust that for the guys that will want to track this car.
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05-04-2014, 04:22 PM | #5 | ||
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Air to water cooler is a much more efficient way of cooling the charge air than a air to air intercooler. The cooling capability of water is much higher than air (hence why we also have very few air cooled engines left...). The S55 has a separate water system that has a radiator mounted in the front, electric water pumps that circulate water from the cooler and through the chargecooler, then back to the radiator to cool down the water again. Does the water in the intercooler system for the M5 really boil? Have never heard any M5 owner report that over on the M5 Boards... What would be the benefit of a air to air cooler? -Longer tubing = lag -Lower cooling capacity than air to water If using air as a cooling medium was better than water, I'm sure we would see a lot of air cooled engines... Water cooling adds weight and needs more associated ancilliaries than a air to air intercooler, that's why early turbo cars had simple air to air intercoolers. |
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05-04-2014, 04:47 PM | #6 | |
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05-04-2014, 05:04 PM | #7 | ||
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So does McLaren in their cars... It will be interesting to see how efficient BMW has managed to deal with heat soak and track driving, but if they can cope with that, air to liquid is the best way to cool the charge air |
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05-04-2014, 05:09 PM | #8 |
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A Bugatti Veyron, nor an M5 are track lap cars. The only convincing arguement that I would believe would be for the Mp4 but engine placement and size of the car there alone makes the liquid to air argument obvious.
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05-04-2014, 05:16 PM | #9 | |
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Heat soak is the main issue that air to liquid cooling has to deal with. Control that and it's the more efficient cooling medium. One way is to use the cooling capabilities of the AC, as a way to cool the radiator and avoid heat soak... Not sure BMW has done this though. |
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05-04-2014, 05:17 PM | #10 | |
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05-04-2014, 05:23 PM | #11 | |
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The heat soak comment is a big deal. It sure does for the 1 lap that it has to finish by showing off to a few people with no timing.
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05-04-2014, 05:28 PM | #12 |
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05-04-2014, 06:20 PM | #13 | |||
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05-04-2014, 07:46 PM | #15 | |
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05-05-2014, 09:10 AM | #16 | |
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I was about to post the same but you beat me to it . |
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05-05-2014, 10:26 AM | #17 | ||
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05-05-2014, 10:40 AM | #19 | |
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Porsche does not have cost control issues nearly as much but do they have packaging issues in their application. They are already running max radiators at the front, use their side vents for air intake, and vent through intercooler through the rear decklid. Where are they going to stick ANOTHER radiator and more cooling hoses? And then the question becomes whether or not it would gain anything in their application. My guess is BMW saw the primary benefit being lag reduction and cooling in this platform and decided to go for it. |
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05-05-2014, 10:48 AM | #20 | |
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It is a question of specific heat properties of fluids. Water can store 3300 times the quantity of energy for one degree of temperature elevation by volume compared to air (about 4x by mass). You need a lot of "air heat" to heat soak a water system... Last edited by CanAutM3; 05-05-2014 at 11:01 AM.. |
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05-05-2014, 11:01 AM | #21 | |
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Hope that makes sense. An air to air intercooler heat soaks easily but also gets rid of heat soak quickly. A water to air intercooler does not heat soak easily but nor does it shed heat as easily. Let's identify the rates. |
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05-05-2014, 11:07 AM | #22 | |
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To prevent heat soak, usually the radiator will be significantly larger than the intercooler, hence, in principle, there is more heat extraction capability in the system than there is to add heat (temperature delta and mass flow is also part of the equation). If BMW have done their homework right (which I suspect they did), the F8X intercooler should not heat soak. Last edited by CanAutM3; 05-05-2014 at 11:25 AM.. |
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