10-17-2022, 05:45 PM | #1 |
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BMW M4 CSL Makes Nearly 600 HP on a Dyno!
Featured on BIMMERPOST.com https://www.roadandtrack.com/news/a4...w-m4-csl-dyno/ Just as the sun rises and sets, BMW publishes conservative horsepower and torque figures. The German owner of a new M4 CSL put their car on the dyno and got an astonishing result—596 hp and 531 lb-ft of torque. BMW, for reference, advertises the M4 CSL at 543 hp and 479 lb-ft. It's better for automakers to under, rather than overrate horsepower to avoid false advertising, but we can't help but wonder how BMW arrives at its power and torque figures. Is its dyno on the top of the mountain? Do engineers turn the heat to 120 degrees? Does whoever is responsible for publishing final figures just subtract 10 percent? Who knows. What we do know is that it is routine for BMWs to make far more power than advertised. Dyno tests from last year on the standard 473-hp M3 suggested that the car probably makes more like 547 hp at the crankshaft, so it's no surprise the CSL—which ups the boost pressure on the M4's straight-six to over 30 psi—makes damn near 600 hp.
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10-17-2022, 07:04 PM | #4 |
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The comp's biggest advantage over the base is in the midrange (3-6k rpm), due to higher boost. See here for a direct dyno comparison. After 6000 rpm, there isn't much difference, and the peak HP numbers are therefore not that different.
Notwithstanding what BMW claims.
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10-17-2022, 08:58 PM | #5 |
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10-18-2022, 11:34 AM | #6 |
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That doesnt suprise me. I think the tq numbers are really where the big difference is between base and comp engine. Power is probably almost the same despite the rating.
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10-18-2022, 11:49 AM | #7 |
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It's only anecdotal but from driving an M3, M5, M4, M4 CSL, etc.. the CSL delivers a lot more power than advertised...
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10-18-2022, 12:16 PM | #8 |
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Which is around where an M4 comp made on a dyno while being rated at only 503.
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10-18-2022, 03:01 PM | #11 |
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600 to the crank. Everywhere except the US, dynos in crank, even with the car on the dyno. I guess they like the higher number.
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10-18-2022, 03:27 PM | #14 |
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When you hold the KEY to the S58 DME... Well, sh!t, those numbers are no surprise.
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10-18-2022, 03:28 PM | #15 |
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10-18-2022, 03:54 PM | #16 |
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Add 15% drivetrain loss and you're right at 575
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10-18-2022, 03:55 PM | #17 | |
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Quote:
Unless you see someone pulling an engine out and strapping it to an engine dyno ... then it's a chassis dyno.
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10-18-2022, 04:09 PM | #18 | ||
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Quote:
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10-18-2022, 04:21 PM | #19 |
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Because those displays are already factoring in that drivetrain loss figure and extrapolating power at the crank. This is pretty common with dyno graphs (although I assume there's some variability among them in how they make these calculations).
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10-18-2022, 04:23 PM | #20 | |
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Quote:
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10-18-2022, 04:35 PM | #21 |
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I agree, whp or nothing for me. And of course a stock baseline on the same dyno under similar conditions.
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10-18-2022, 08:03 PM | #22 |
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