02-04-2015, 07:16 PM
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#3 (permalink)
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A True Z Fanatic
Join Date: Mar 2009
Location: Chicago
Posts: 3,669
Drives: 370
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Quote:
Originally Posted by edconline
1) Only GPS speed readings mean anything, the faster you go the more inaccurate the speedo is.
2) I'm not sure if the car does more than 112km/h. The max speed limit here is 110km/h but once I went over by two by mistake.
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The speed limiter is not based on speedometer needle position, it is based on the reading from the (very accurate) rear axle speed sensors. The only variable is tire rolling diameter. If the rear tire diameter is correct, regardless of speedometer needle indication, the speed limiter will engage at the proper preset speed with very little error.
What that speed is? Somewhere between 155-160. My speedometer needle indicated about 158 or 159mph when the car would stop accelerating (back when I still had the speed limiter active). I cant remember what the original setting in the ECU was before I changed it.
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