OBD2 boost readings on the Evo X are often capped around 22.3 psi. However, using Evoscan 2.6 b16+ with Mode23 allows for higher readings. It’s common for boost gauges to read slightly higher (1-2 psi) than the actual boost pressure logged by the ECU. This discrepancy can be attributed to factors like barometric pressure influencing gauge readings, even when the car is off.
While a significant difference between gauge and logged boost might be concerning, the primary focus should be on the car’s overall performance and safety parameters. Consistent and safe A/F ratios, knock levels, and other logged data are more critical than the absolute boost number displayed. If the car runs smoothly and safely, minor variations in boost readings shouldn’t cause alarm.
The question of which reading represents the “actual” boost is interesting, but consistency is key for performance tuning. Think of it like using a tire pressure gauge at the track. If a gauge consistently reads 5 psi higher but delivers the fastest and most consistent lap times at a specific reading, the actual pressure becomes less important. The same principle applies to boost; a consistent reading, even if slightly off, is valuable for repeatable performance. Ultimately, if the car performs well and safely at a specific boost reading, the precise number is secondary.
Have you noticed any differences between your boost gauge and logged data on your Evo X?
