Quote:
Originally Posted by mwilliamshs
Got my SG this weekend and it matches GPS. Speedo reads high in comparison. Difference between actual ( SG & GPS) is proportional to speed and is consistent so I think it's just the nature of the mechanism. I'll be changing tires in the next few weeks so I'll measure odometer offset after that change rather than measuring it twice.
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I'm really considering going to buy a GPS and return it after a day so I can set my car in, but... I really dont wanna be that guy. haha.
But people just don't own accurate GPS units anymore like the mid 2000's, not with inaccurate smart phones so prevalent these days so it is hard to find one just to borrow from a friend or the sort. But With 175/70/13's on I was spinning 2960 rpm @ 70 just like what I got in my calculations on what the drivetrain should spin at that speed. So it seems accurate in the obd2 rpm signal but the gauges always have that steady margin of error like you stated.