iRacing BoP engine power settings got a significant expansion in the 2026 Season 2 Patch 2 update. For the first time, the Engine Power Adjustment can go above 100%, so series operators can increase a car’s output, not just reduce it.
What Changed in the BoP Engine Power Setting
Before this patch, iRacing BoP engine power could only go down. The Engine Power Adjustment setting allowed values below 100%, meaning you could pull power out of a car but not add it above stock. That limit is gone. The new range runs from 90% to 110% of original engine power. This applies to official series, hosted sessions, and test sessions. Series operators can now push a car’s power above its baseline to close gaps in multi-class fields.
Vehicle Weight Can Now Go Negative
The Vehicle Weight Adjustment gets the same treatment. Previously, you could only add weight to a car, with a ceiling of plus 250Kg. Now the floor drops to minus 50Kg. iRacing can reduce a car’s mass below its stock weight. The full range is minus 50Kg to plus 250Kg. Both adjustments show in the published BoP for official series events. You can also test both settings in the garage during a test session.
Why This Matters for Series Balancing
In multi-class GTP fields, the biggest balancing levers are typically weight and aero. But some cars have engine output as the primary competitive variable. When power could only go down, a slow car on power had no clean fix. Reducing every competitor was the only option. Now there is a direct path to bring an underpowered car up to pace without changing the other cars at all.
For hosted league administrators, this opens up new possibilities too. Custom BoP configurations for multi-make fields can now work in both directions on power. Weight reduction also changes the handling conversation. A lighter car rotates differently, brakes shorter, and puts the driving challenge in a different place than adding power alone. For leagues that tune BoP carefully, this is a real addition. iRacing has not announced which official series will use the new range first, but the tools are now live.
