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More ado about the 996 speedo

Old 07-09-2013, 01:51 PM
Dennis C
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My 996 speedo reads 3 - 4 mph slower than the speed indicated on my GPS or on radar speed-limit signs. My Cayenne always matches the GPS and the sign readings.
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Old 07-09-2013, 06:59 PM
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I think most of us would prefer accuracy across the board. I know years ago, speedo shops that tested police vehicles would simply change a gear in the tranny to adjust the speed if it was off, but obviously everything is based on electronics now.
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Old 07-11-2013, 03:29 AM
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My BMWs, Mini, and 996 all read higher by 3-4MPH than what is actual. Verified with GPS and mile markers. My Ford & Dodge are accurate.
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Old 07-11-2013, 12:04 PM
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In the "Things you didn't know about the 996" thread, there are conversations about this issue. The consensus is that the offset (~3 mph) was a Porsche decision to comply with German laws that forbid under-reporting of speed, and this can't be adjusted. You can find the unadjusted speed (in KPH only) on MK-I cars through the Climate Control display.
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Old 07-11-2013, 01:06 PM
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Possibly a little known fact here is that the accuracy of the speedo can tweeked by the dealer to make it accurate. This was a topic of discussion in '97 or '98 on PPBB the Boxster forum. I had my '99 Boxster at the dealer while still under warranty and had them adjust it. I then checked it against my GPS and it was 100%.
I never did my C2 or the Turbo.
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Old 07-03-2014, 03:52 PM
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can anyone tell me how much of a wet dream is the idea of a 200 mph gps speedo

seated in it's proper place inside a 996 guage cluster?

I've got a nice one available from speed hut, but it would complicate things,

as it would have to switch positions with the tachometer to do it.

not exactly what I had in mind.

Last edited by odurandina; 07-03-2014 at 08:49 PM.
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