OEM boost gauge?

[Rumbarger]

I've read time and time again that the OEM boost gauge IS NOT a real boost gauge. How is it different than an after-market boost gauge? Is it accurate at all?

 

[95RedTsiAwd]

Ummm....not really. It is an electronic gauge that sorta guesses airflow based on things like Throttle position and other parameters that the ECU sees, then it sorta comes up with a number and sends that to the gauge.

I sheared off the turbine wheel of my T3, and the stock gauge still said I could still boost so no, not accurate at all in my opinion.

 

[Bmxr152]

yeah its not even close to being accurate. I was boosting 25 psi and it wasnt even pegged. dont trust it at all!

 

[Rumbarger]

Haha thats great! Do you guys know what PSI i would be running in a stock 1g auto? Is it around the 10 PSI the gauge shows me, being a stock car?

 

[talonalex92]

Ha, before my talon was wrecked and totaled, it actually once read boost @ idle. I had to laugh haha.

 

[DGajre777]

Haha thats great! Do you guys know what PSI i would be running in a stock 1g auto? Is it around the 10 PSI the gauge shows me, being a stock car?

Whatever your actuator spring pressure is on your car. If you are showing 10psi on a boost gauge and don't have a boost controller to turn it up, then the spring pressure is 10 psi.