| 02-16-2016, 09:29 AM | #1 |
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650xi n63tu 1/4 mile?
i just bought a cpo 650xi coupe 2013 with n63tu engine.
i have jb+ ordered, arriving soon. was wondering what does this kinda car run 1/4 stock vs tuned? i saw the new stock x5 50i running 1/4 mile in 12.8 in reviews and the latest 650xi gc ran 12.7, hows that possible since x5 is about 700 lbs heavier? |
| 02-21-2016, 11:13 AM | #2 |
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| 02-21-2016, 12:42 PM | #3 |
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The magic of torque
 Although 650xi gc is about 550 lb lighter than X5 5.0 (4600 lb 5150 lb), X5 sends more torque to wheels due to shorter FD ratio (3.15 vs 2.82) while both cars have the same ZF transmission and the same gear ratio. The basic physic F=m*a introduces the acceleration as F/m where F is representing Force at wheels and m is representing the mass. Since Force is calculated based on torque (at crank) and gear ratios (transmission and axle ratio), both cars have almost the same F/m ratio or the same acceleration (if we forbear the rolling force and air resistance force) and we should expect almost the same 1/4 mile result; however 650xi gc is a little faster because of better drag coefficient factor due to the body shape...
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| 02-21-2016, 01:38 PM | #4 |
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I have a 2014 BMW 550xi with the N63TU and I currently hold every world record for that car
 1/4 Bone stock - 12.5 1/4 with JB (stock Exhaust)- 12.00 1/4 with JB and Full (Catless exhaust)- 11.8 1/4 with ECU tune and full Catless exhuast (Enzo) - 11.5 0-60 Mph in 3.4 (Vbox proven) all day! Cars a beast from 0-100mph |
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| 02-21-2016, 10:03 PM | #5 | |
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| 03-03-2016, 10:51 PM | #6 | |
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| 03-03-2016, 10:54 PM | #7 | |
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should i expect about the same result from my car? did you run 91 oct or 93 oct? i have 91 oct non ethanol available at few pumps, i can blend 91 with 14% total ethanol to get 93-94 octane, what are your thoughts on that? |
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| 03-03-2016, 10:58 PM | #8 | ||
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I'm in NY/NJ so 93 is everywhere |
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| 03-03-2016, 11:02 PM | #9 | |
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is the warranty void with this kind of tuning? is it reversible? my car is cpo till 2019 so thats why asking. |
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| 03-03-2016, 11:02 PM | #10 | ||
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| 03-03-2016, 11:03 PM | #11 | |
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| 03-04-2016, 01:51 PM | #12 | ||
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The N63TU is a beast |
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| 03-06-2016, 11:57 AM | #13 | |
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another question to bother you, when you were using jb tune did you leave the dial at default setting or was it turned up? |
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| 03-06-2016, 12:29 PM | #14 | ||
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 m setting. On Daily driving |
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