[FamilyRide]

So many of us install gauges and assume (ass-u-me) that as long as they "appear" to be close, that they are dead on accurate.

Got back with my Ex. that's been at the dealer for almost 4 days. To cut through everything they were doing, they did a lot of diagnostics, test drives with etc. testing turbo boost (for the split boot) as wellas everything else that would be related to the EGR cooler trying to make sure nothing else seemed amiss.

During testing, they documented that max boost was 24.6 psi which is well within spec and all was good.

On the way home I stodd on it to watch and see what it was doing now (stock, no tune). I easly hit 28-30 psi MAX on my gauge which is tapped into the elbow.

So, could my gauge be reading that high? Has anyone ever calibrated their gauges? How do we know the gauges are as close as possible to right on?

 

[RagingMain]

Gauges take a beating during shipping, I am sure they could be off when they arrive. Plus we are just relying on the manufacture to ensure its accuracy.

I know in the Navy depending on the gauge it was calibrated every 1-2 years. You would have to find a shop that had all the required equipment and take it to them. Dont know if there are any around that do it for consumers, guess one could check

I am sure we could rig up some home made cal equip but what would we calibrate that by???
Cheers

 

[Larry202br]

Analog gauges in general are at best, +/-1% of full scale accuracy, and most are about +/-2%.
If your meter is 60 PSI full scale, then the error can be as much as 1.2 PSI just in the meter error alone. Add in the accuracy of the pressure sensor, and that could easily double the error, another 1.2 PSI. Your system can be checked and calibrated at any metrology lab. How does the dealer measure the boost? Do they use a sensor already on your Ex somewhere, and attach it to their gauge, or read it from the ECM? There's gonna be error there too. I wonder if the boost gauges are calibrated at the factory like boat speedos are, intentionally reading a bit high?