Is there any way to test the accuracy of a boost gauge (other than the obvious try a different gauge). I currently have a stg 0+ w/ test pipe on a 91 oct base map on the xede, and it shows that I'm hitting 24 psi in 3rd gear. I assume the car does not have an Xflash because the rev limiter is still at 7500rpms. I've never hit boost cut, but I wonder if it's just a faulty boost gauge. Any thoughts? Should I be concerned?

 

yep on 91 oct the most boost you can see is 23psi with the xede but just a spike

 

But if I was truly hitting 24 psi shouldn't I experience boost cut? That's why I think that the gauge may just be off. I haven't once experienced a boost cut. So back to my question, is there any way to test the accuracy of the gauge, or is there a specific brand of gauge that is known to be more accurate than the others? I have an autometer boost gauge, but I've read some people that claim that they may read up to 2psi off.

 

hook up an air compressor on it but shut off the compressor when it hits 15 psi on the gauge...then connect it somehow to the line that goes to the gauge....gauge on compressor and on the car show match..

 

IMO all boost gauges are off. I had the same problem with my Defi D gauge. It was showing that I was boosting to 23.xx psi and I was concerned that this was too high on 91 pump gas so I backed off the boost using the boost table in the Xede.

I have since installed a 3 bar MAP sensor and I am logging boost using the Innovate LM-1. Turns out that I was only boosting to 21.xx at peak. The gauge was off by as much as 1.5 psi. After this, I have added some boost back to the boost table in the Xede.

These gauges should not be relied on as an accurate measure of boost.