K04 Dyno Baseline

This morning the S4 went back onto the DynoJet dyno for a series of pulls with the BorgWarner K04’s and a moderate boost Daz tune.

The purpose of this session was to establish more baseline data for making comparisons to some aftermarket turbocharger options.

Chart of BW K04 baseline dyno pulls — BW K04 baseline dyno pulls

The ‘final’ results peak dyno numbers are of less interest to me than the shape of the torque curve. I am expecting a K04-hybrid turbocharger to be capable of more peak torque and power than the RS4 K04.

Here is the boost profile that this tune uses:

K04 Stg3 tune boost profile

Boost and MAF

Boost and N75 Duty Cycle

Note: The PID was calibrated for loads experienced on the street since tuning was not done on a dyno. The load presented by the Dynojet differed from that on the street. The boost / torque oscillations seen on the dyno are not replicated on the street.

Here’s a street pull:

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Here is how the K04’s compare with K03 turbochargers on my car. K03’s are shown with two different tunes, one very aggressive and the other moderately aggressive.