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Thread: RPM, Speedometer vs MVPI2+ VCM data logging

  1. 09-09-2021 #1
    Saab84mw
    Saab84mw is offline
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    RPM, Speedometer vs MVPI2+ VCM data logging

    Just got my new MPVI2+ Decided to take my truck out and do a highway run and noticed the differences between RPM and speedo gauges from the truck and VCM data logging.

    I set my cruise control had about 74 miles an hour and 26 to 2700 RPMs with the VCM showing 2300 RPMs at 68 miles an hour and holding steady.

    I just don?t believe I was doing 68 miles an hour seems like I?m running in the middle of the pack speed limit the area was 65 miles an hour was passing some cars and being passed by some cars.

    Is there anyway to calibrate that or to fix that issue? seemed like it was way off.
    1999 K2500 Suburban L29 7.4 216,000 on original engine lost oil pressure.
    Almost 7,000 on complete rebuild with a mild Comp Cam.
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  2. 09-09-2021 #2
    5FDP
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    You can re-poll for supported parameters in the VCM scanner again. But it's usually pretty well spot on.

    Use your phones google maps to see if the speed matches your truck or the laptop.
    2016 Silverado CCSB 5.3/6L80e, not as slow but still heavy.

    If you don't post your tune and logs when you have questions you aren't helping yourself.
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