Starting on New Years Day I am taking advantage of some extra free time to get ready to swap the Frankenturbo F21s into the S4.
The S4 sits on a set of dollies so it can move about the garage easily for positioning. The car is at an angle in the garage when the engine hoist removes the engine.
Spending Friday evening removing the engine.
Saturday is turbo swap day. This took a bit longer than usual on account of the Mamba wastegate bracket on the passenger side being too big.
Some cutting and filing of the bracket is done so that it will fit in place because the unmodified bracket contacts the cylinder head and/or starter.
On go the new F21s.
Before installing the engine the wastegate preload is set to 12 psi. The setup is using the Yellow springs from the Mamba collection of springs.
Finally on Sunday the engine is installed.
With a number of different turbocharger pairs sitting in boxes, and a good pair on the car, I’ve had trouble deciding what to do next with my S4.
Then there is an incomplete engine sitting in the corner of my garage that will open some opportunities on account of the 2.8 heads and built bottom end.
After several months of no progress on either I took some free time on New Years day to start preparing the car to pull out the engine.
The built engine is not ready so that option is out for now. My goal with the TiAL turbochargers is to have them made over into 770’s, so that leaves me with a choice between the BW RS6 turbo’s:
Or prototype FrankenTurbo F21 with ceramic coated turbine housings and Mamba wastegate actuators.
I’m leaning toward the F21s on account of them being an easy transition from the Turbo Concepts Stage 1 turbos that are presently on the car.