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boost gauge and contoller reading different boost


jessejames

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I've got an sr20det with an autometer boost gauge and a blitz sbc ID spec R controller. I set the controller to 10psi and took it for a spin. The gauge read 15psi while the controller was only showing 7psi. I unhooked the controller and installed the factory vacuum lines and then took it for a drive again. This time both the controller and the gauge read the same psi around 7-8psi. I then connected both the boost controller and the gauge to a air compressor and they both read the same 15psi that i had set it too. In the car both the controller and gauge are reading pressure from the hose between the FPR and intake manifold. Please Help!

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Do you have a link to a manual?

 

Nigel

'73 240ZT

 

Here is the link the to manual http://www.blitzpowerusa.com/techsupport/pdf/sbc_i-d_iii.pdf

 

I know have a proper reading on boost on both the controller and gauge. The Controller is overboosting. I set the boost to 10psi and it hit 18psi. I then lowered the boost setting to 7psi and it hit 9psi. The gain was set to about 10. The controller is on automatic mode.

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