For years, many people have been reporting to me as much as a 10 MPH error on the 9000 when traveling at freeway speeds (reading high). I never could verify this on my car, in fact with the automatic, I measured a scant 3% error, which seems acceptable.

However, just this weekend I recalculated it (same method - mileage markers on the freeway and a stopwatch), and was shocked to see that I was going about 60 mph when my speedo indicated 66 mph. That's a 10% error! No wonder people seem mad when I set the cruise control at 5 mph over the limit...

I am using the {sun-visor} recommended 205/55/15 tires on my car, the only change from stock being a 15 x 7 wheel vs a 15 x 6 wheel. Oh, and when I measured the 3% error at 60 mph, my car had the automatic transmission. I believe the wider wheel stretches the tire slightly, and decreases the overall rolling diameter slightly, but to the tune of 7% ???

Does anyone else think that a 10% speedo error is a bit much?

What kind of error are you all seeing? Thanks!

Aaron Gilbert
1987 9000T 252k miles

• Quick Survey - Speedometer Error, Aaron Gilbert, Mon, 5 Mar 2001 15:03:46 <-- Viewing This Message
  • Re: Speedometer Error on my '91 9000 T 5spd, Shahn, Wed, 7 Mar 2001 03:57:11
  • Re: Quick Survey - Speedometer Error, shawn feller, Tue, 6 Mar 2001 17:37:08
    • Gotta agree with Keith and Mark.., Aaron Gilbert, Tue, 6 Mar 2001 21:57:35
    • uh, I think you're right!, dave n, Tue, 6 Mar 2001 18:33:31
      • It's the principle of the thing!, Keith , Tue, 6 Mar 2001 19:17:08
        • Re: It's the principle of the thing!, Mark Nagel, Tue, 6 Mar 2001 21:47:47
          • never thought of that!, dave n, Wed, 7 Mar 2001 11:45:07
  • My two 9ks also had significant + error, EricG, Tue, 6 Mar 2001 09:26:26
    • Re: My two 9ks also had significant + error, jeffla, Tue, 6 Mar 2001 14:14:07
  • Yes, too much, Robert Davis, Tue, 6 Mar 2001 08:47:20
    • Speedo cable is electronic (after '86 I believe), Aaron Gilbert, Tue, 6 Mar 2001 12:50:14
  • Speedometer Error caused by non-turbo tranny, Kurt, Tue, 6 Mar 2001 07:22:21
    • So how do you tell if the tranny is a turbo or non-turbo? n/m, Aaron Gilbert, Tue, 6 Mar 2001 12:52:51
      • Find the GM number, Kurt, Tue, 6 Mar 2001 15:02:18
  • Mine's dead on, Quasi, Tue, 6 Mar 2001 00:29:07
  • that's exactly what I have, dave n, Mon, 5 Mar 2001 19:02:51
    • Re: that's exactly what I have, mark, Mon, 5 Mar 2001 23:04:18
      • auto, right?, dave n, Tue, 6 Mar 2001 07:50:47
  • Re: Quick Survey - Speedometer Error, Craig, Mon, 5 Mar 2001 17:11:05
    • So I'm not the only one, Keith , Mon, 5 Mar 2001 19:01:18
  • Tranmission, Kyle, Mon, 5 Mar 2001 17:07:51

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