Anyone done any tests? What's the margin of error?

 

My D-series reads about 1.5 psi high. It is my poser gauge. The $6.00 chinese, Grainger gauge I have reads 0.25 psi high.

 

Holy cow. Are you serious? What is your conclusion then...that the Defi is highly inaccurate?

 

What is your baseline?

 

I used a highly accurate (0.5 psi) pressure tester from my work and ran it against my Defi boost guage. Once I saw the difference I bought the Grainger gauge and it was only 0.25 psi off. All were run up to 22 psi.

I am not saying that all Defi gauges are off, I only have one data point in my sample.

 

Fair enough. If I find a way to cross test I will.

 

there was a similiar thread a while back. When I had my car dynoed my d-gauge read about 1.5 to 2.0psi higher than the boost gauge the shop gauge read on their dyno. Plus, the shop owner had seen this before with other defi d-gauges...which is unacceptable if you ask me.

 

If this is true...no kidding. WTF? All the literature expressly proclaims the high degree of accuracy.

 

How can i test it mine

 

It's called marketing. They are probably very accurate to their own standard! Haha, kind of like some of the other EVO products sold out there.

It's a good rule of thumb to never believe a company's own advertising or promotion. It's always going to be a puffed up version of the truth and it will never relay the negatives either. That's why word of mouth is so important. It's called third party perspective and it says a lot more than a company's brochures. That's why I recommend Autometer gauges (tried and true) and GSC motorsports, and TurboTrix Tuning, and Hotchkis springs, etc etc etc.

 

Hmmm...so are you saying I'm actually only running 19 PSI instead of the indicated 21 PSI???

 

/\ thats what I found out...

 

How Can I Test Mine ?

 

+1 I want to know that my gauge is reading correctly.

 

I guess it's better to have it read high rather than low...