Auto meter vs Dashboss

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Sep 27, 2015 | 04:45 PM

J ballan

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Fleet Mechanic

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From: Saskatchewan

Auto meter vs Dashboss

Hello everyone, I'm seeing a difference in my boost gauges. The Auto meter gauge is reading between 2 and 4psi high compared to my Dash boss. I'm not sure which to trust? The auto meter still will hit around 30-32 psi at full boost in the upper gears while the dash boss is pretty much maxed at 26-28psi. I've had the turbo apart and cleaned the unison ring. The truck runs fine and doesn't set any codes. Thanks

Sep 27, 2015 | 05:18 PM

Bullitt390

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Is the Autometer a manual gauge tee'd into the CAC?

Dashboss is reporting what the PCM is reading. Also if you're running a tune, it can be written to "fool" the PCM explaining why it is reporting low.

Josh

Sep 27, 2015 | 05:35 PM

78fordman

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From: Jefferson, Iowa

I would trust the manual gauge as to actual psi. As Bullitt390 said, a tune will mess with map readings and icp pressure readings also. That's why icp voltage is sometimes an essential number.

Sep 27, 2015 | 05:50 PM

J ballan

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From: Saskatchewan

Quote:

Originally Posted by Bullitt390

Yes it's tied into the elbow before the throttle plate looking thing. These numbers are consistent before and after my SCT tune. I guess I could pop my Auto meter mechanical gauge out and try a different one easy enough.

Sep 27, 2015 | 05:52 PM

J ballan

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From: Saskatchewan

If it is accurate I wonder why I'm getting so much boost. It's easy to hit 30psi especially when towing. Empty it stays under 28 until I hit the upper gears.

Sep 27, 2015 | 05:56 PM

Bullitt390

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Quote:

Originally Posted by J ballan

If it is accurate I wonder why I'm getting so much boost. It's easy to hit 30psi especially when towing. Empty it stays under 28 until I hit the upper gears.

Not that hard to get 30+ psi.

However, with stock head bolts I wouldn't push it past 26 psi, 28 max IMHO.

Josh

Sep 27, 2015 | 08:13 PM

78fordman

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From: Jefferson, Iowa

Is your ebp sensor plugged in? I have had to run a truck with the ebp unplugged for a while and it seemed to have boosted more than with it plugged in, may want to verify it's clean also.