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Tag Archives: wastegate

Fast Friday #4 — The Boost Variance Problem

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. Continue reading

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Troubleshooting Low Boost

Underboost is a condition that can be caused by several issues including: Bad TCV Bad Turbocharger Failed boost sensor (for models that have them) ECU seeing overboost and cutting back until reset and condition remedied Failed MAF (for ecu’s that … Continue reading

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Tightening up the Turbo Waste Gate ?

Wastegate Settings – Numbers and Theory The idea here is to assure the wastegate valve remains closed until the wastegate experiences the preset pressure in the VADIS doc above. Anything higher than the Vadis pressure and the wastegate valve shoud … Continue reading


’97 850 Turbo De-Tuning

Help Me Make My Volvo Slower! I know I’m going to sound stupid and ignorant with this, but I need to know if there is any way to tune down my 850 turbo. I kicks in at the slightest throttle … Continue reading


Modifying the Wastegate actuator rod…

The Cheapest Performance Mod The 4.4 Motronics (94-98) can handle up to 3+ turns but you don’t want to do that. You will actually get too much boost almost off the line and in bad weather can be a bit … Continue reading

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