Boost Pressure Variance

Posted by Administrator on 7/30/2012 to ARD Blog Articles


Boost pressure issues seem to be the #2 issue in the Volvo Performance world, beaten out only by vacuum leaks. Boost pressure control in the 1994-1998 models is a pretty simple system but for the ECU to manage boost correctly it relies heavily on known base values and settings. If these settings are off or if there are mechanical issues then the boost control system can be out of whack.

 

Chip or MBC?

Posted by Lucky on 7/30/2012 to ARD Blog Articles


MBC's are great devices and by and large can provide decent performance upgrades, however there are some issue to be aware of before simply installing one. Since the ECU is no longer in control of boost and the MBC will allow boost to develop as fast as the turbo can provide it (up to the adjusted target) you're flowing quite a bit more air and consequently have more load against the engine than the ECU is tuned for. This means you may have too much timing and not enough fuel in the early part of the RPM band where you really need it. This is the primary source of how and why MBC's can damage these engines, specifically with respect to bending rods or spinning rod bearings.

 

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