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Pressure will increase significantly under load because of the turbo charger verses just rpm testing in the driveway. You did not say if you have a computer controled unit or mechanical govenor. The mechanical govener system may set badley or have the fuel pincher blocking rack travel or have any number of other problems. On a computer engine you need to hook it up to a scaner and see what the computer is seeing about the boost pressure and other parameters. The govoner set up is absolutely critical to get these things to make good power.
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