Login






BMW Garage  BMW Meets  Register  Search  Today's Posts  Mark Forums Read 

BMW 3Series (E90 E92) Forum
>
Legal Help  335xi Acceleration Data


12202011, 05:35 PM  #1 
Enlisted Member
2
Rep 39
Posts 
Legal Help  335xi Acceleration Data
Hello,
I recently got a bogus charge that I am trying to defend. I need a reliable source for acceleration times and distances for my 2007 335xi. It is important that I show the impossibility of my vehicle accelerating to 42MPH in the short distance the policed claimed. It is easy to find 060 times, but I really need distances calculated. Any ideas? Last edited by Cory1970; 11252012 at 02:16 PM. 
12202011, 05:42 PM  #2 
Brigadier General
86
Rep 3,728
Posts 
Well I've seen 335's with 06 in 3.2 seconds on a Vbox. That was an e90 335i....not sure about the Xi but I would assume it can do the same since it has more traction.
__________________
2008 BMW 335i e90  Sold  Rob Beck Turbos / PROcede V5 / Aquamist HFS4 / AR Downpipes / AE Exhaust / ER Comp FMIC / ER CP / TiAL BOV / Custom Intake / RPI Scoops / Quaife LSD / SwiftKoni Coilovers / DSS HS / Morr VS8.2 Sig Black / Michelin PSS / P3 Boost Guage / M3 body / M3 steering wheel / Adam's Rotors / Hawk HPS / SS lines /

Appreciate
0

12202011, 05:44 PM  #3 
Lieutenant Colonel
21
Rep 1,691
Posts 
Stock 335i 045 in 3.3 seconds. XI probably similar.
__________________
2007 BMW 328I Monaco Blue /// 1999 BMW M3 Titanium Silver /// 2007 BMW 328I Sparkling Graphite (sold)

Appreciate
0

12202011, 05:45 PM  #4  
Enlisted Member
2
Rep 39
Posts 
Quote:
I had been driving half way down a very short city block when the police claimed I had accelerated to 42 MPH. 

Appreciate
0

12202011, 05:51 PM  #5 
One cam is enough
111
Rep 6,811
Posts 
Assuming constant acceleration during the voyage from 0 to 42 MPH, you would have needed to travel approximately 31m if it takes 3.3 seconds to get there.
I think. It's possible my math may be wrong. That's also assuming you can prove you were at a stop at the beginning of the block. Otherwise the point is moot. 
Appreciate
0

12202011, 05:59 PM  #8 
New Member
0
Rep 21
Posts 
quick search on google found this hopefully this can give you some sort of idea
http://forums.corvetteforum.com/c6t...alculator.html
__________________
2011 BSM E90 335i MSport 
Appreciate
0

12202011, 06:00 PM  #9  
Lieutenant Colonel
21
Rep 1,691
Posts 
Quote:
__________________
2007 BMW 328I Monaco Blue /// 1999 BMW M3 Titanium Silver /// 2007 BMW 328I Sparkling Graphite (sold)


Appreciate
0

12202011, 06:13 PM  #11 
Colonel
73
Rep 2,556
Posts
Drives: 2008 335i
Join Date: Sep 2010
Location: at the repair shop

i don't know how useful this is, good luck OP, even if you get convicted of doing 38mph, if the street limit was 35 you're just as guilty in the eyes of the court.
this by the way isn't accurate because acceleration isn't uniform. 
Appreciate
0

12202011, 06:16 PM  #12 
One cam is enough
111
Rep 6,811
Posts 

Appreciate
0

12202011, 06:38 PM  #13 
Lieutenant
14
Rep 509
Posts 
You Must Be Kidding
Q. Is is possible to attain the speed of 42 mph from a dead stop within a single city block when driving a BMW 07 335xi?
A. Yes, your honor. You: Profuse sweat. Verdict: Fail.
__________________
Present: 2015 Audi A3 2.0T Quattro  Scuba Blue  Sport
Past: 2011 E90 335 xDrive (March Build)  Deep Sea Blue  Saddle Brown  Brushed Aluminum Packages & Options: Premium  Sport  Cold Weather  BMW Apps, iDrive & iPod Past: 2008 E90 328xi  Montego Blue  Dakota Black  Brushed Aluminum Packages & Options: Premium  Sport  Xenon  CA  Heated Seats  iPod 
Appreciate
0

12202011, 06:50 PM  #14 
Second Lieutenant
9
Rep 263
Posts 
Just do what I do. Pay the ticket and every time you see them on the side of the road call them a f@g when you drive by. They never chase you and it just feels great.

Appreciate
0

12202011, 07:03 PM  #15 
armchair enthusiast
108
Rep 938
Posts 
my 2c  Don't try to bring specs or physics to court, that's just going to piss the judge off. All that matters is how fast the cop thinks you were going.
Hire a lawyer who knows that court. Good luck.
__________________
07 328xi coupe SG/Dakota leather, 6speed manual, sport/premium/cold
02 325Cic vert AW/Montana leather, 5speed manual, premium/removable hardtop 93 850Ci Oxford Green/Parchment, auto 71 Buick Riviera, 455 V8 land yacht 
Appreciate
0

12202011, 07:09 PM  #16 
Lieutenant General
825
Rep 13,829
Posts 
The only possible situation I can see 42 as being the end of the world is possibly in a school zone. I did 52 in a 25 and my first impulse was not to hire a lawyer, nor deny it. I did it. The question was how do I not get a 40% insurance surcharge which costs much more than the ticket for the next 3 years.

Appreciate
0

12202011, 07:11 PM  #17 
Captain
20
Rep 645
Posts 
__________________
2007 BMW 335I JB4 G5,DCI,VRSF DPs,NT555r Drag Radials Daily Driver

Appreciate
0

12202011, 07:12 PM  #18 
Lieutenant General
825
Rep 13,829
Posts 
I think there was a case Fico v. Commonwealth where the accused combined his credit score and a metabolic panel to prove unequivocally that he was not fit to travel at the rate he was accused. There are so many ways to duck a question like that. That's what makes this the greatest nation on earth, it doesn't even matter.

Appreciate
0

12202011, 08:17 PM  #19  
Second Lieutenant
2
Rep 256
Posts 
Quote:
Acceleration = F/m, where F is the net force applied to a mass, m. a=f/m, acceleration in terms of velocity. a = v  u/t Delta Velocity divided by Time. A = ΔV ÷ T Acceleration is worked out by (final speed  initial speed)/ time taken for change in speed a = v2v1/ t2t1 Strictly you should say velocity ie the speed in a certain direction. Youalso have the formula f=ma which tells you that the force needed to get something moving will be the mass of the object multiplied by the accelertion you want to achieve; so from this formula if you know force and mass you can work out acceleration. The formula for acceleration is: Vf(Vi)/t ie. change in velocity per unit time. Instantaneous acceleration in its differential form is d2x/dt2 where x is a function of time t. Acceleration is the time rate of change of velocity. That is, acceleration =dv/dt (v  velocity ; t  time) Or simply acceleration = change in velocity / time Read more: http://wiki.answers.com/Q/What_is_th...#ixzz1h7iiSywL 

Appreciate
0

12202011, 09:04 PM  #20 
Enlisted Member
2
Rep 39
Posts 
Thanks for all the great information. I will be taking some street measurements tomorrow. Lucky there is video evidence showing a start and end point of acceleration. This will make it much easier to show a point of reference.
I will try to make a diagram and post it up. Thanks 
Appreciate
0

12202011, 09:18 PM  #21 
New Member
1
Rep 22
Posts 
You can come up with all the data you want, but it will depend on you starting from a stop.
You: your honor, it is physically impossible for me to attain that speed from a stop in that distance. Cop: maybe you ran the stop sign, say what you want, but you were going that fast. Judge: guilty 
Appreciate
0

12212011, 12:29 AM  #22 
Lieutenant Colonel
32
Rep 1,754
Posts 
If they got you on radar or laser, you're gone unless you can succesfully challenge the unit calibration, officer training, or something like that. If it's critical, get a lawyer. They don't have to prove it's "possible" for you to have reached that speed. They just have to show evidence (which they presumably have) that you were clocked at 42. End of discussion.
Absent some problem with equipment, you CAN'T prove it's impossible, the evidence contradicts you. 
Appreciate
0

Bookmarks 
Thread Tools  Search this Thread 

