October 29, 2019

Testing results for the VAITRIX BOOSTER ECU on the Volvo SPA (T6 ENGINE). This includes both the regular T6 as well as the T6 with the Polestar Optimization.

These tests include dyno testing on our 4WD HLS dyno, as well as acceleration testing in the video below.



One important factor for testing on a piggyback unit is to ensure that the ECU does not alter or lean out the Lambda signal of the primary O2 sensor as a result of increased boost (but shadowed by using signal modification). At Vaitrix, ensuring the Booster ECU works in conjunction with the car's wideband system, and does not push it to the limits is paramount.

Upon testing with the Volvo, we found that the stock Lambda/AFR curve under full boost and wide open throttle was not ideal. Most likely adjusted for emissions and fuel economy, the T6 engine runs near stoich upwards of 4500rpm. 

In this same area of the powerband, the car is near 21psi of boost. This combination is not ideal. However, with the Booster ECU installed and running our Stage 1 mapping, the T6 wideband system adjusted happily, lowering from 14.6 AFR to 12.6 in the same range. At higher rpm the AFRs are near identical.

In this same area of the powerband in stock form, the car was pulling timing due to the higher lambda (leaner mixture) under boost. Once the wideband system compensated under the new boost mapping, it actually advanced timing by 1.5 to 2 degrees under a richer mixture. This picked up quite a bit more power that had been left on the table in the 4000-5500rpm area. 

Under both dyno conditions and road conditions, the wideband control is maintaining very healthy Lambda values under peak boost, and is in no danger of straining it's output.

AFR Chart:









For those interested, the car was run in all different driving modes to observe and measure the differences in peak power, as well as torque curve/output.


All dyno runs were performed under similar conditions and variables on our Dimsport HLS 4WD/2WD linked load dyno. Vehicle was completely stock using 91 octane fuel.