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#1 (permalink) Old 01-09-2009, 07:31 AM
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Top speeds?

well, a couple weeks ago, i eased on the gas a bit and accidently hit 142 mph before the top speed limiter stopped me in my '95 M3 (stock engine by the way). I thought this was rather interesting because i read on the internet that this car is electronically governed at 137. does anyone know if speed limiters are based on a more accurate speed reading or something? if so, why is the speedometer not using this reading? also it would be interesting to hear other's stories

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#2 (permalink) Old 01-09-2009, 08:50 AM
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5mph at those speeds is within the acceptable error for your speedo. Did you measure 142 on your speedo or on a gps system?



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#3 (permalink) Old 01-09-2009, 03:50 PM
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well, i'm glad i didn't shell out the extra $$$ for the M3 then. I topped out my 94 325i with all stock parts at 137 a couple of years ago. Promptly getting a speeding ticket from CHP has led to my discontinuance of this practice.
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#4 (permalink) Old 01-09-2009, 03:54 PM
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Promptly getting a speeding ticket from CHP has led to my discontinuance of this practice
LOL.......actually not so funny......nobody likes getting a speeding ticket, especially at that speed.....

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#5 (permalink) Old 01-09-2009, 09:37 PM
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My 95 m3 with chip and 7,200 rpm redline hits an indicated 165mph (guessing since the speedo only goes to 160) in top gear.

Also, speedos are always generous with their speeds.. its to help people who choose to ignore what size tire they SHOULD have on their car and sometimes go wider, taller, etc and changes the actual speed of the vehicle. So if the car is supposed to have 225/45/17's and you put 245/45/17's on there, that 5-10mph that you'll gain by having higher sidewalls offsets the factory discrepency.


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#6 (permalink) Old 01-09-2009, 11:56 PM
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Quote:
Originally Posted by nukeduster View Post
My 95 m3 with chip and 7,200 rpm redline hits an indicated 165mph (guessing since the speedo only goes to 160) in top gear.

Also, speedos are always generous with their speeds.. its to help people who choose to ignore what size tire they SHOULD have on their car and sometimes go wider, taller, etc and changes the actual speed of the vehicle. So if the car is supposed to have 225/45/17's and you put 245/45/17's on there, that 5-10mph that you'll gain by having higher sidewalls offsets the factory discrepency.
edit: nevermind answered my own question.

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#7 (permalink) Old 01-10-2009, 02:29 PM
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So if I change my tires from 225/50/R16 to 225/45/R17 in front and 235/45/R17 in rear, it will give me 5 to 10 mph more, is that what you mean Nukeduster?
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#8 (permalink) Old 01-10-2009, 04:46 PM
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Quote:
Originally Posted by fabcal View Post
So if I change my tires from 225/50/R16 to 225/45/R17 in front and 235/45/R17 in rear, it will give me 5 to 10 mph more, is that what you mean Nukeduster?
What he means is that it will show a higher speed instead of you going at that speed.



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#9 (permalink) Old 01-10-2009, 05:23 PM
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oh ok, I would've never thought that
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