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04-20-2011, 08:03 PM | #23 |
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Right, that is what I meant by specs of the car: Cd, frontal area, whp, etc.
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04-20-2011, 08:06 PM | #24 | |
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04-20-2011, 11:34 PM | #25 | |
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Why do I feel foolish when reading about the speed limiter? I thought M's were not speed limited... hmm.
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04-21-2011, 07:48 AM | #26 |
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04-21-2011, 08:39 AM | #27 | |
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This might be why my sport button does not behave anything like my buddy's e46m. His physically bumps the car revs up instantly and lurches the car forward while cruising. Mine doesn't change anything while cruising, you can just feel the difference in pick up next time you blip the throttle - little more snap and squat more instantly. If I'm cruising and I turn off sport mode I feel like a little wind was let out of the sail and throttle response is back to normal. This sound indicative of a tune or does everybody's e86m behave this way like I thought?
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04-21-2011, 09:27 AM | #28 | |
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04-21-2011, 09:31 AM | #29 |
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I somehow dug this out from the back of my mind, but you can actually overcome the speed limiter at 5th gear, but if you try it at sixth, the limiter kicks in. I'm not sure if this only applies to e46 m3 or it also applies to the z4m.
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04-21-2011, 10:49 AM | #30 | |
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1) 4.35:1 = 39MPH 2) 2.50:1 = 67MPH 3) 1.66:1 = 101MPH 4) 1.23:1 = 137MPH 5) 1.00:1 = 168MPH 6) 0.85:1 = 198MPH Still using 25" tire diameter and 8200 fuel cutoff, 3.622:1 final drive. Maybe I had a small typo yesterday which gave 193 in 6th gear. If you can in fact bypass the limiter in 5th (though this is the first I've heard of it), 168 definitely seems attainable. |
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04-21-2011, 10:51 AM | #31 |
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There is no limiter in 5th. That's a fact.
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04-21-2011, 10:52 AM | #32 |
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Huh...seems strange but ok
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04-21-2011, 10:58 AM | #33 | |
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04-21-2011, 11:19 AM | #34 |
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So yeah, if you're somewhere in Mexico with no aftermarket tune trying to reach top speed, 5th gear!
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04-21-2011, 12:03 PM | #35 |
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Very basic calculation here.
drag coefficient 0.35 Frontal Area 1.91 m^2 mz4 power = 248kw air density = 1.225kg/m^3 @15C assuming ~20hp to overcome friction. 82.75m/s or 185.1mph that said I've done ~160 in my MZ4 and 167 in my e46 m3 and I don't think it would make it to 185.
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04-21-2011, 12:28 PM | #36 |
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Z4M top speed
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04-21-2011, 12:41 PM | #37 | |
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And those of you going by the car's speedometer, they're anywhere from 5-10% PLUS 10MPH too optimistic. When you say "I did 1XX mph at [name the place]," if you're going by what the speedometer tells you you're likely at least 10 mph slower than your actual indicated speed. A case in point, if you ever watch that video of Hans Stuck driving the M6 on the Autobahn and the MPH heads up display showed 192 mph and he was still pulling? If you did the same theoretical top speed calculations I think you'll find that given the M6's CD and frontal area that it would peter out right at the 194-195 mark. There's no way that car can continue to "pull" even at 192 like that. EDIT: Nevermind. You took out 20hp to account for friction. My bad.
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04-21-2011, 12:52 PM | #38 |
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04-21-2011, 01:03 PM | #39 |
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Absolutely. At triple digit speeds where percentage error has a larger effect, ANYTHING will throw your speedo off. Aside from the fact that it reads on the high side by design, it is virtually impossible to get a precise reading from (is that 151 or 152? 151.5?), and simple variances in treadwear and tire pressure (as air expands with heat) will affect indicated speed. I guess you could use nitrogen or another gas that's volume is not related to temperature to combat this, but it doesn't address everything else that is affecting the reading.
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04-21-2011, 01:06 PM | #40 | |
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04-21-2011, 04:14 PM | #41 |
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Ok, cool.
Re: speed limiter in 6th only... How about if one surpasses the 155 mark and THEN shifts into 6th? Speed limiter kick or stay bypassed? Food for thought..
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04-21-2011, 04:27 PM | #42 | |
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Operating under a few assumptions / train of logic: 1. Car doesn't limit speed to 155 in any other gear except 6--therefore you can surpass 155 in 5th. 2. Car doesn't care about limiting engine power in any other gear except 6. 3. Car only cares that 155mph shall not be passed in 6th gear. 4. When you shift into 6th gear, the car becomes "aware" of the speed for the purposes of limiting top speed. 5. Shifting car to from 5th to 6th gear when doing greater than 155 will activate the limiter, as the car is now "aware" that it has surpassed 155 for the purposes of limiting top speed.
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04-21-2011, 05:01 PM | #43 |
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You also have to remember that its 155MPH plus or minus 10%.............
Also, there is no switch to tell the car is in 6th. Its a just a function of Speed... Last edited by Shipkiller; 04-24-2011 at 07:13 AM.. |
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04-21-2011, 08:07 PM | #44 | |
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Threw me for a loop with that plus or minus 10%. Plus 10% puts you at 170, the car will BARELY get there (stock) and I think that's only on a downhill or tailwind and talking indicated speed type of situation.
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