FrankenTurbo F21 Mixed Flow Dyno Results

I now have a LOT of data to go through and make sense of.  Here are the results from taking my S4 equipped with FrankenTurbo’s F21 mixed flow turbochargers to the Dynojet I have logged my car on previously.

Picture of car at FrankenTurbo F21 Dyno Session
FrankenTurbo F21 Dyno Session

The car was evaluated with three tunes, thanks to Daz for his assistance with getting all three of these together.  As in the past timeliness was more critical than thoroughness, I needed to get the car on the dyno and was less concerned with having a smooth tune and more concerned with getting to a point that the car could be dyno’d and logged.

The tunes respectively 1) boost to 27 psi and hold 27 psi, 2) boost to 27 psi and taper to 24 psi, and 3) boost to 23-24 psi and hold approximately 22 psi.  The third tune was intended to roughly simulate the boost profile used with the K04 tune I dyno’d previously.

F21 Results

Here are the power and torque results with the F21’s.

Chart of FrankenTurbo F21MF Dynojet Wheelhorsepower
FrankenTurbo F21MF Dynojet Wheel horsepower
Chart of FrankenTurbo F21MF Dynojet Wheel torque
FrankenTurbo F21MF Dynojet Wheel torque
Chart of FrankenTurbo F21MF Boost Profiles
FrankenTurbo F21MF Boost Profiles

 

Turbocharger compressor outlet temperatures at 22 and 27 psi:

Chart of FrankenTurbo F21 Turbo Compressor Outlet Temperature at 27 vs 22 psi manifold pressure
FrankenTurbo F21 Turbo Compressor Outlet Temperature at 27 vs 22 psi manifold pressure

K04 boost comparison

Here are these results compared with those from the BW K04’s.

This is how the boost profiles matched up:

Chart of K04 vs F21 Boost Profile
K04 vs F21 Boost Profile

 

And the dyno results:

Chart of FT21 vs K04 (K04 Boost Profile)
FT21 vs K04 (K04 Boost Profile)
Chart of K04 vs F21 Dynojet Wheel Torque
K04 vs F21 Dynojet Wheel Torque

The chart above illustrates the low end strength of the quick spooling BW K04’s.

The point of this comparison at equal boost levels was less about how the dyno numbers would turn out and more about being able to collect temperature and pressure data with similar tunes.

All boost comparison

The following comparison is of the K04’s versus F21’s when operating the F21’s at a boost level more in line with what can better take advantage of the hybrids features.

Here are the boost profiles of K04’s and F21’s:

Chart of K04 vs F21 All Boost Levels
K04 vs F21 All Boost Levels

Dyno results with the F21 low boost pulls removed.

Chart of K04 vs F21 Dynojet Wheel Torque
K04 vs F21 Dynojet Wheel Torque
Chart of K04 vs F21 Dynojet Wheel Horsepower
K04 vs F21 Dynojet Wheel Horsepower

 

Table of FrankenTurbo vs K04 Peak DynoJet numbers
FrankenTurbo vs K04 Peak DynoJet numbers

 

If the F21 tuning had been optimized, based upon the dyno results obtained today, this is how the F21 might compare to the K04.

Composite F21 Results
Composite F21 Results

Green lines are for the BW K04’s.

Further comparisons

Much more data was logged on the dyno as well as the street and I will be going through that information to try and draw some conclusions about the attributes of the F21 versus those of the K04.

Compressor Temperature Data

Chart of Compressor Inlet vs Outlet Temperatures
Compressor Inlet vs Outlet Temperatures

 

Shown as temperature delta:

Chart of Compressor Inlet to Outlet Temperature Delta
Compressor Inlet to Outlet Temperature Delta

 

Comparison of the Intake Air Temperature after being conditioned by the Silly Rabbit Motorsports SMIC’s and TorqByte CM5 Water-Methanol Injection system.

Chart of K04 and FT21 DynoJet dyno Intake Air Temperatures
K04 and FT21 DynoJet dyno Intake Air Temperatures

I’m very pleased with these results, especially considering they are occurring on a dyno.

Pre-Turbo Exhaust Gas Temperatures:

Chart of EGT Bank 1
EGT Bank 1

 

Chart of EGT Bank 2
EGT Bank 2

 

Post-Turbo Exhaust Gas Temperature (degreesF):

Chart of Post-Turbo Exhaust Gas Temperature
Post-Turbo Exhaust Gas Temperature

 

Airflow:

Chart of K04 vs FT21 MAF
K04 vs FT21 MAF

Street Log

Repeating what I said at the top of the post, I have LOT of data to sift through.  Weeks of tuning on the K04’s and then F21’s have generated many logs.

Here’s one example of a street log to contemplate how it compares to the dyno logs from above.

Chart of K04 vs F21 Street driven boost log
K04 vs F21 Street driven boost log