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I just did 170mph in my stock M5. How in the world is this possible?

2626 Views 15 Replies 15 Participants Last post by  "S62"
As the title states. I was doing a run on the highway with some cars, and I ended up going all the way to 170mph, until I hit fuel cut.
My friend has the video to prove it. My car is 100% stock with no software. How is it not limited to 155mph?

I know it was stupid of me. And very unsafe. And I will never do anything close to that again. I experienced quite the adrenaline rush :eek:oohhh:
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Wirelessly posted (BlackBerry9550/5.0.0.320 Profile/MIDP-2.1 Configuration/CLDC-1.1 VendorID/105)

Speedometer error most likely. Did you check it against GPS?
 

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I knew BMW speedo's were optimistic, but almost 9% error? Wow.

BTW: Shame. Shame. Don't ever do that again.
 

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+1 on the optimistic speedo

Most publications agree that BMW has the most inaccurate speedometers. The funny thing is that the odometer is right on, but because of liability issues with reading lower than actual speeds for possible tire size differences, BMW has erred towards tuning the indicated speed high while everything else is right on.

Your GPS navigation has a feature that allows you to view GPS speed, and that should be right on. For me, I am going 60 GPS and roughly the same at the odometer at 63 MPH indicated, at least with the tire wear I have at the moment..

I also believe that the speedo gets more 'happy' % wise as speeds go north too.
 

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I found old cable driven speedos 10% over at all speeds, and both bmw's run off abs (or wherever) 2/3mph over at all speeds - not checked at really high speeds, but don't think it would go off so wildly above 100mph when so linear below.
As it knows what speed you are actually doing, adding a couple mph for safety makes sense to me, this to increase to 10%/15mph doesn't.
Do keep meaning to check against tomtom early one morning.... :M5thumbs:
 
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