Stock FATS

I got around to making a 3rd gear pull up to 6500 rpm today on the stock tune.  It was almost entirely uphill so as far as the time aspect is concerned the results are not valid.  I was more interested in recording how the stock tune performs and a couple of other measurements which are shown below.

The pressure drop through the stock intercoolers continues to increase as rpm increases, but with the stock tune only requesting between 8-9 psi the k03’s have no trouble supplying the requested boost.

Stock FATS Boost Levels
Pressure Drop of Stock Tune -> 6500 rpm

 

I continue to be impressed by how well the stock intercoolers work with the k03’s and stock tuning.  This pseudo-FATS pull was made after warming the car up in stop and go traffic, making a stop to pickup some tires, and then almost immediately after coming out of a parking lot I was turning onto the onramp and going wot. That’s the type of scenario that can show IAT’s going through the roof.

As can been seen from the chart comparing the compressor outlet temperature to that at the intake air temperature sensor, the stock IC’s really did a good job even with a pull out to 6500 rpm.

Stock IC IAT to 6500 rpm
Charge Temperature Drop with Stock IC’s and Stock Tune -> 6500 rpm

Exhaust Pressure Measurement

I am interested in recording the pressure of the exhaust gasses entering the turbocharger’s turbine which should be nearly the same as the turbine inlet pressure (TIP).  To do this without altering the exhaust manifold necessitated piecing together an adapter to which I could attach a pressure sensor.  With some helpful suggestions from Jonathon C. I pieced together this adapter.  I also acquired a 4 Bar absolute pressure sensor from Auber instruments to feed pressure readings into the Innovate LMA-3 for post drive analysis.

Apparatus for measuring exhaust gas pressureNow that I have all of the equipment on hand I need to get it installed, wired up, and calibrated so that I can see how much pressure is building up before the K03 turbine inlet.

 

RS4 Airbox

Took another step toward completing a transition over to a Bosch RS4 MAF sensor by acquiring an RS4 Airbox top.  The lower half of the RS4 and S4 airboxes are nearly identical with the RS4 airbox just having a port that opens to allow more air in.  The darintake modification, cutting openings in the lower half of the stock S4 airbox accomplishes the same function so that the only needed piece of the intake is the top half of the airbox that attaches to the 83mm RS4 MAF housing.

Another benefit to having the RS4 airbox on hand will be to flow test it versus the stock airbox.

Audi B5 RS4 Airbox and MAF
Audi B5 RS4 Airbox and RS4 MAF with Bosch Sensor

Audi B5 S4 Information and Testing