Reply to "Speedo Repair/Recalibration"

Astephens (Guest)

Kelly,
My car does about 80 mph at 3000 rpm. The speedo indicates 90 mph. I have BFG 285/40-18's in back. I believe the tire is 27 or 27.1 inches in diameter. I have a 4.22 ring and pinon and the .642 taller than stock fifth gear.
I don't know how accurate my stock tach is? Your numbers of 81 mph at 3000 rpm seem high to me based on what I have witnessed with my car. My tach could be reading low but the 80 mph is gps verified. I understand that a speedo shop can install an in line gizmo that is adjustable so that you should be able to make your speedo accurate regardless of tire size.
Art

12/2/066:28 PM

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