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.
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:
Boost and MAF
Boost and N75 Duty Cycle
Here’s a street pull:
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.
What is notable about the chart above is how closely the torque curve of the K03 and K04 match one another.
Below are the EGT readings for each turbocharger/tune on the dyno.