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APR K04 Kit for Audi B7 A4 2.0T FSI
Mulitple venue testing coming in the months of July and August!
The APR B7 A4 2.0T FSI K04 Turbo system is available from any authorized APR distributor as well as directly from APR. It
currently has an MSRP of $4299.00. The kit for this car was ordered directly from APR and came safely boxed and including
1. K04-034 Turbocharger and OEM Exhaust Manifold with N75 and Upgraded "710 C" Bypass Valve
2. APR 3.25" to 2.5" Catalytic Converter Delete Pipe
3. Fuel System Component
4. All Associated Gaskets and Mounting Hardware
5. APR K04 Specific Programming
This turbo arrived with the updated "710 C" Bypass Valve and all the hardware required for installation. Audi
of Lexington is a new APR distributor and requested they be the installer of this turbo. The installation went smoothly with
less hassle than had been seen in the installation of the K04-15 turbos that had been used in the B6 A4 1.8T applications.
The new exhaust manifold design for the B7 A4 allows that only the top bolts of the manifold must be removed to free the
manifold from the motor. The bolts that connect the catalytic conveter (or testpipe if you have one) to the old turbo were
all that had to be removed from the back side of the turbo. The catalytic conveter was able to be moved out of the way with
ease due to the flex coupling of the exhaust downpipe allowing for easy movement.
The fuel system upgrade component did not have to be replaced on this vehicle as it aleady was equipped with the updated
valve however if needed, the procedure adds approximately 1 hour to the installation time.
The coolant was not drained but instead the line was plugged. The oil was drained and changed for maintenance purposes.
Following the installation the vehicle was driven to Auto Motion of Louisville Kentucky under the power of the stock mode
chip and it was then reprogrammed by Bryan Rose with the proper APR K04 specific file.
Thank you to Jake Broomfield the service manager at Audi of Lexington (www.audioflexington.com) for his expert personal
care with intalling this turbo system. In addition, thank you to Bryan Rose of Auto Motion Kentucky (www.automotionky.com)
for his expert reprogramming skills and exremely fair pricing and consistent support.
Please click the image below for photographs of the K03 and K04 turbo...
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| Click Photo to View the K04 Gallery |
Following the successful installation of the K04 turbo system and software, the vehicle was allowed to adapt to it's new state
of tune for approximately 500 miles.
Once adaptation had occured the vehicle underwent its complete set of post K04 data logs. The following data logs represent
the best available comparison between the fully modified K03 powered B7 A4 2.0T FSI (APR 93 programming, Carbonio intake,
APR testpipe, Neuspeed exhaust) and its most recent state of tune with the K04 tubo system installed (K04 turbo, APR 93 programming,
Carbonio intake, APR testpipe, Neuspeed exhaust). There were many datalogs taken during the testing of the OEM K03 turbo
system however the following logs represent the most similar ambient temps and were all taken in 3rd gear and in the same
test location (road surface characteristics).
Please see the following link for an explanation of the measuring blocks used during this data logging comparison...
Vag-Com Data Logging Measuring Block Interpretation Guide
The first comparison logs represent the intake air mass measured at the mass aiflow sensor. Note that the K04 powered car
has gained approximately 28g/s compared to the K03 powered car when measured under the same conditions...
The following two logs represent boost pressure of the APR tuned K03 turbo and the APR tuned K04 turbo.
Note the significant boost pressure increases are seen from 3000rpm to 4250rpm and most significantly in the top end of
the powerband from 5500rpm to 6800rpm. The increaed boost up top in the powerband allows for much smoother and stronger
powerband all the way up to redline...
Note the following datalog is of only the K04 turbo requested and actual boost. Just as with their K03 turbo software, APR
has once again shown just how precise their control of boost pressure can be. APR has learned the efficiency range of the
turbo and requests from it almost precisely what it is able to deliver. Therefore, in the event of overspooling, the factory
overboost safeguards remain utilized preventing a costly turbo failure...
The following are comparison data logs of the air/fuel ratio for both the APR tuned K03 turbo and the APR tuned K04 turbo.
Note that APR remains able to keep up with fuel demands while retaining an extremely safe OEM-like air/fuel ratio allowing
for adequate cylinder cooling up top where it is critical. This allows for excellent pre-turbine exhaust gas temperature
readings (see the measuring block tutorial for an explanation of EGT) as well as the ability to safely add timing. This is
one of the critical components we will see later during dyno logs comparisons in which APR is able to provide such a smooth
horespower curve up top even in the K03 application...
The following data logs represent a comparison in timing used in both the APR tuned K03 and K04 applications.
Note the K04 uses a bit less timing up top which is something that might have been expected considering the increase in
boost pressure that is now available up top (you can run lots of timing or lots of boost but usually not both without compromise).
Although the logs are what might have been anticipated, what was interesting is the knock control (block 20) aka the timing
retard seen for each program.
The K03 evidenced up to 5 degrees of timing retard using 93 octane fuel in heated summer temperatures. The K04 evidences
0 degrees of timing retard across the powerband using the same Shell 93 octane fuel in slightly warmer ambient temperatures.
This evidences a conservative and safe tune that likely has more room for power through increased timing. Bosch indicates
that optimal timing is the point at which timning used and timing retarded intersect meaning to attempt to run with as little
timing retard as possible while using as much timing as possible. Since the car is retarding 0 degrees, there is no way to
know how much can safely be added however if other vehicles evidence the same retard level a request to APR with multiple
logs may allow small increments be added in the future until small amounts of retard are seen...
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