Only tuned to 6500rpm, but look at the resluts so far....The twin Rotrex Jaydee K24 compared to the Jaydee K24 with 584WHP	Still tuning the twins. With the 520WHP run the ignition has been set very consertively so we are loosing potentially 30 to 40whp. The other runs are at reduced wastegate settings.
The graphs above are for the upgraded motor partially tuned with 38mm valves (CNC head) and featuring the Jaydee modified RRC inlet manifold

The water injection has now been upgraded to 3D mapping using the Autronic SM4 to control the % of water flow. This tuning is in progress. Its a balance between water quantity and spark advance.

Running the 2 Rotrex in a serial installation max's out the C38-91 on the inlet side. It will not make boost well before maximum charger speed as the air is going sonic on the inlet. The C38-91 is too small.....for the air quantity being consumed and the wheel speed of the compressor.

If you are looking to maximise boost at high rpms you will need the chargers in parellel.
But the series install is unreal for low down and midrange torque....... torque is what accelerates cars....Have a look at the green torque graph... in the left hand graph.