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04-20-2011, 11:21 AM | #1 |
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Theoretical top speed of Z4M?
The other day I was wondering if anyone knew what the top speed of the Z4M is if the limiter were to be removed. What is this car capable of doing in terms of top speed?
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04-20-2011, 11:30 AM | #2 |
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Using stock ratios, 25" tire dia, and 8200 fuel cut off, gear limited top speed is about 193mph
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04-20-2011, 11:51 AM | #4 | |
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Quote:
There's another thread on here somewhere about this.
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04-20-2011, 11:58 AM | #5 | |
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Regardless, the car should be drag limited prior to reaching that speed (meaning, it will stop accelerating at a lower speed due to not being able to overcome drag). It is possible to calculate the power to overcome drag at different speeds based on the specs of the car, but that won't account for friction elsewhere such as the drivetrain and tires. Anyway, I would rely on the manufacturer's claim (if they ever released it), or on a report of what the car might have done on the autobahn with GPS validation--not that I think it is a good idea to test that in any sort of public road even when it is legal to do so.
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04-20-2011, 11:58 AM | #6 |
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Terminal velocity when dropped out of an airplane for the MZ4 is about 180mph I think.
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04-20-2011, 12:01 PM | #7 |
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Why is that relevant?
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04-20-2011, 12:04 PM | #8 |
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No, a stock Z4M won't do anywhere near 190 MPH, somewhere around 170 MPH is more realistic
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04-20-2011, 12:48 PM | #10 |
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04-20-2011, 12:53 PM | #11 |
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190mph speedometer measured is somewhat believable. But real speed? That's highly doubtful.
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04-20-2011, 01:51 PM | #12 |
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low 170s drag limited sounds about right
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04-20-2011, 01:59 PM | #13 |
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Prove it.
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04-20-2011, 02:00 PM | #14 |
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For comparison, the last NSX had a top speed of 175 from a 290hp (underrated) engine. The Cayman S has a top speed of 171.
I would probably guess our cars can hit vmax of ~170.
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04-20-2011, 05:50 PM | #15 |
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04-20-2011, 06:17 PM | #16 |
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When they were first released I remember reading something either from BMW or from spartanburg claiming the top speed to be in the 170's de-limited,
I'm sure it was to the higher end of the 170's too,
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04-20-2011, 06:18 PM | #17 | |
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I tested it in Forza 3 a while back and without messing with any settings it was about 170-180
edit: http://www.zpost.com/forums/showthre...ighlight=forza Quote:
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04-20-2011, 06:39 PM | #18 | |
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Additionally, comparing cars deregulated top speed with similar power won't tell much without comparing their cD to the Z4's. Coupe or roadster will also make a difference, since it's aerodynamic footprint is not identical. You would even expect things such as ambient temperature, elevation (air density), tire pressure, and road surface to have slight effects. The maximum speed the gearing will allow is about 193. All of the above factors are going to work against achieving that MPH. How much of an effect each variable will have is also dynamic, meaning that they might never be exactly the same, lending to the reason that official top speed runs are an average of 2 back to back runs in opposite directions. Even then, I tend to think of top speed in a similar way I do lap times, or baseball statistics. They are only 100% accurate in reporting what has happened, and can give a general idea of what a car (or player) is capable of, but is no where near a perfect predictor, as there are too many uncertain, unmeasurable, and unreproducible externalities not only built into the numbers already recorded, but any subsequent numbers as well. |
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04-20-2011, 07:27 PM | #20 |
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04-20-2011, 08:00 PM | #21 |
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That is (perhaps) what it would do if it were to be acted on by gravity alone in mid air. What you are referencing is the terminal velocity of a free falling object, which doesn't have much to do with a car travelling on a road under its own power. If it had 1000whp, it would do 200mph+ (assuming it is stable at that speed and tires hold up, etc); it wouldn't all of a sudden stop accelerating at 180mph. If the force at the tires exerted by the drivetrain is larger than the opposing drag force, the car is accelerating. Nothing more to it than that. At 200mph the stock tires might not hold up, but I suspect the car would be "stable" but "shaky" if it had enough power to overcome air resistance. If power is not an issue, the true "theoretical" top speed on the road would be dictated by when it becomes unstable--mainly generate too much lift--and become uncontrollable.
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04-20-2011, 08:03 PM | #22 |
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I did 155.4 mph in the standing mile at Texas last March - measured by their equipment; 156 mph on a Garmin GPS inside the car as I let off a bit after the mile I was in 5th gear and the car was still pulling but not as hard as it was in the first 1/2-3/4ths mile. Even got a little famous
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