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10-10-2015, 11:56 PM | #1 |
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Z4m coupe top speed 300km/hr
As its my first post here, I would like to say Hi to everybody and share my following video.
Hope you enjoy it as I did . |
10-11-2015, 03:25 AM | #2 |
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Bloody hell, hope your doing that on one hell of a straight at a circuit mate.
Welcome..
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10-11-2015, 03:34 AM | #3 |
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10-11-2015, 08:37 AM | #5 |
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10-11-2015, 04:31 PM | #6 |
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That's one hell of a first post! Welcome! What tune do you have?
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10-11-2015, 04:43 PM | #7 |
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Thought the same thing but he wouldn't be getting that acceleration with a lower numerical rear gear
What 007 said.......what tune?
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10-11-2015, 11:16 PM | #8 | |
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Currently I am running with SS V1 stepped headers, rpi scoop & cat back exhaust, custom tune and 3.91diff. All of the above the diff made the biggest difference, lots of torque and higher top speed. I have some pictures at my albums if you want to have a look at the car from some events-gatherings..... |
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10-11-2015, 11:23 PM | #9 |
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[QUOTE=dbarton62;18726848]Thought the same thing but he wouldn't be getting that acceleration with a lower numerical rear gear
I wish it could but not possible . With 3.91 ring & pinion you have to go all the way near the rpm limiter to reach 300Km/hr. But it really transforms the car, you just need good tarmac to feel the difference, otherwise it spins a lot.... |
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10-16-2015, 07:42 AM | #10 |
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Don't mean to sound negative, but if you did that on a public road you could've easily killed yourself. One bump in the road and you'd go flying out of control. Stay safe man.
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10-16-2015, 09:49 AM | #11 |
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No gps speed?
That is the only conclusive way to measure if you want to make real conclusions about top speed. You can use android tracks or some other (free) logger. GPS is 100% accurate.
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10-16-2015, 01:10 PM | #12 |
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O wow. I reach only ones 172mph. Well it cannot be 100% as I was not monitoring the speed professional. But I got pretty scare going that high speed. Only ones in my roadster. Never again. Feels very different going 150 mph and going 172mph. And yes I agree with Twixboy in a public rode it felt even worse. Crazy experience but not doing it again.
Nice first post tough. I wonder how you were able to get the camera to record just the speedometer. |
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10-16-2015, 03:54 PM | #13 | |
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[QUOTE=Nikitas_Z4mcoupe;18728146]
Quote:
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10-16-2015, 04:03 PM | #14 | |
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Makes sense. Just like different tyres give errors (and the speed dial itself isnt that accurate too)
Thats why I always use gps if I want to know the actual speed. Everyone carries a gps nowadays in their phone so you can always log your journey and see your top speed. For performance testing (0-60 or whatever) I use a seperate 10hz gps, so I get a real accurate time. Phone gps chips only have a 1 second refresh interval. Quote:
At those kind of speeds I'm always afraid that my rear glass window will shatter or that my hood will tear off completely The fabric at the back really starts to resonate. I think there may be some kind of vortex at those speeds on the back of the fabric top. Also above 170mph there is some kind of force on the side windows that sucks them a bit apart and that also creates an ear deafening slit. (at least on my car, maybe I can adjust the windows a bit tighter) The ragtop is not made for those speeds I guess.
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Last edited by GuidoK; 10-16-2015 at 04:09 PM.. |
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10-17-2015, 12:47 AM | #15 | |
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[QUOTE=dc_wright;18757916]
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not same as reducing the diameter of the wheels - tyres |
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10-17-2015, 01:07 AM | #16 | |
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I just wanted to share with you guys as going through the net, youtube etc I have never seen any other Z4m reaching this speed only M3s Thanks.....Iphone can fit in between the wheel...... |
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10-17-2015, 01:14 AM | #17 | |
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10-17-2015, 09:14 AM | #20 | |
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Pickup point is after the diff
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10-17-2015, 01:22 PM | #21 | |
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Especially hoods with a big curvature. Hoods on supersportscars mostly are much flatter as their base sits higher.
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10-17-2015, 04:59 PM | #22 |
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My bad! I was thinking there was a speed sensor on the diff that sensed the ring gear teeth like earlier BMWs used...............
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