OEM Boost Gauge in GTPP

[GenerousLemon]

I helped a buddy of mine enable the factory boost gauge and his will only read .5psi. Not sure what they do in the tune.

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[engineermike]

I helped a buddy of mine enable the factory boost gauge and his will only read .5psi. Not sure what they do in the tune.

What tune is it?

 

[GenerousLemon]

What tune is it?

He’s tuned Rob at PBD

 

[engineermike]

He’s tuned Rob at PBD

The signal to the oem gauge is a digital one, meaning no scaling is required because the number is communicated not like a 0-5v signal that must be converted.

Unless it’s a roush kit, the number is inferred not measured. The speed-density model in the computer calculates the manifold pressure because it is needed to predict throttle body flow. The accuracy of the speed-density model, and how it’s configured, will determine how and how accurately the boost gauge reads.

 

[96gt4.6]

^ This.

And, there is more than one way to skin a cat per se as far as tuning goes. Which is why some tunes cause this to read inaccurately, but the car runs/drives great and makes good numbers. Nothing wrong with that either, it's just how that tuner prefers to do things.

I can only speak for Whipple tuning on my setup, which appears to be 100% on with my mechanical gauge, however I am at stock boost levels, and have no idea above that if they are still accurate. I am planning on going Ethanol soon, and adding boost, so I wanted to get something in here that can actually read boost proper once I start down that road.

Ran with the OEM boost/Vac gauge for 2 years though, it was pretty much the only gauge I kept up on the dash all the time from then on! haha.

 

[svildosola]

I had one in my car, was not accurate. It said i was making 14psi on an 82mm pulley lol. I changed out the eco gauges for real boost and oil pressure gauges and they look and work awesome.

hi, I know this old, but do you know what the size of gauges is? im also planning on using a real boost gauge and perhaps a fuel pressure one instead of oil pressure.

thanks

 

[Cory S]

hi, I know this old, but do you know what the size of gauges is? im also planning on using a real boost gauge and perhaps a fuel pressure one instead of oil pressure.

thanks

2 1/16”

 

[svildosola]

2 1/16”

thank u!

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