08-05-2013, 05:35 PM | #24 |
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are we talking chrome side grilles or something else?
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08-05-2013, 07:17 PM | #25 | |
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In the UK where straight roads, nevermind dry ones, are in less abundance, it only adds weight (ha!) to the GT-R's corner. I love my M5, don't get me wrong, but I've got my hands dirty, learned about some of the oily bits and more empirically, have found its limits. Ed. |
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08-06-2013, 03:07 AM | #27 | |
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I can understand the points about the airflow through the wheel arches, and over the intercoolers and oil coolers, and under the subframe, but if hot air rises, and the engine compartment is sealed, would the hot stagnant air not just sit there, on top of the engine area, as it has nowhere to go ?. Are you hankering after a GT-R Ed ?. |
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08-06-2013, 10:47 AM | #28 |
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Well, "the video was too dark". Maybe next time then I guess, GTR's don't like admit that they lose to us in a strait line!
Time to invest in my own GoPro! |
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08-06-2013, 01:56 PM | #29 | |
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I can only assume that the dedicated heat exchangers themselves (radiator - coolant, oil cooler - oil, intercoolers - charge air) were intended to be sufficient in their capacity as to keep the engine within an operating envelope over a range of conditions. It's unfortunate and I have to say, a little disappointing, that some owners are finding the limits of this range. I can see how my comments on the GT-R might have read. It's a car whose abilities I do respect. But - and it's a big butt (!) - it's not really a car I could see myself in |
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08-06-2013, 04:28 PM | #30 | |
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Generally agree, but let's not forget the OP said it was 107F outside. That's well outside of the normal operating temperature of a car - it will work at the temp, but racing in that temp just doesn't make sense - the M5 is not a race car. It's a very fast super-saloon - fast enough so it can run with the best of the world's super sedans, but it's not going to win in all conditions against the likes of the GTR. |
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08-06-2013, 05:08 PM | #31 |
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The one question if both the M5 and GTR are turbocharged, how is the GTR better at heat disapation?
Also interestingly, the ///M folks in Austin were quite proud of the M5/M6 cooling to prevent that.
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08-06-2013, 05:20 PM | #32 |
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GT-R's chief engineer explained that the distance from the front tire edge to the fender was designed to work with aerodynamics of the front to pull air from the engine bay, thereby keeping temperatures at check. Then people go and put spacers for looks
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08-06-2013, 05:51 PM | #33 |
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It would be interesting to see what ambient tap water does to a red hot engine.
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08-06-2013, 07:22 PM | #34 | |
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As far as I can remember, no M5 has ever had bonnet/hood louvres, a la AM Vantage V12 or even E92 M3 - and I'd suggest that Motorsport Division, or at least their marketing department, were keen to maintain that tradition. Style over substance unfortunately. Slightly ironic given that the E92 M3 has one real and one 'dummy' nostril, yet as it is N/A, has far fewer heat dissipation issues - and is the first mass produced M3 thus adorned. Ed. |
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08-07-2013, 12:55 AM | #35 | |
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08-07-2013, 03:37 AM | #36 |
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I owned a TT RS a couple of years ago, and this car had very similar heat soak problems. It had a sealed engine bay, with no air outlet vents/bonnet hood louvres. The single turbo was at the back of the engine, very nearly touching the bulkhead and very little space, with again, nowhere for the heat to go. One of the slight mods at the time, was to remove the rear rubber seal, that ran along the top of the bulkhead, creating a slight space for heat to escape. I actually tried this mod, and was surprised at just how much heat was escaping through the slight gap created. Im positive some strategically placed venting would have a great effect on this problem.
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08-07-2013, 07:52 AM | #37 | |
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But yes, during the premier, the engineer talked about the air flow they created thru the V for the turbos. See http://sirsnapsalot.smugmug.com/Cars...hB35&lb=1&s=XL For a picture during the discussion. I did not have a chance to discuss the issue with him during the track day.
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08-07-2013, 08:33 AM | #38 | ||
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