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:

Chart of K04 Stg3 tune boost profile
K04 Stg3 tune boost profile

 

Boost and MAF

Boost & MAF
Boost & MAF

 

Boost and N75 Duty Cycle

Boost & N75DC
Boost & N75DC
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:

street_54F

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.

K03 (NVR & Nef tunes) vs K04 (Daz tune) Wheel Torque
K03 (NVR & Nef tunes) vs K04 (Daz tune) Wheel Torque

What is notable about the chart above is how closely the torque curve of the K03 and K04 match one another.

K03 (NVR & Nef tunes) vs K04 (Daz tune) Wheel Horsepower
K03 (NVR & Nef tunes) vs K04 (Daz tune) Wheel Horsepower

 

Below are the EGT readings for each turbocharger/tune on the dyno.

Chart of K03 vs K04 EGT readings on dyno
K03 vs K04 EGT readings on dyno