Category Archives: Engine

Engine, Misc.

6th engine pull

Getting ahead of the game, I’ve got plans to put some different turbochargers in the car but at the moment haven’t established exactly what they’ll look like.  The motor is coming out so I can work on a few accessories and swap exhaust manifolds then hopefully within a couple of weeks will have a different set of turbochargers to evaluate.

audi b5 s4 engine pull
6th time the motor has come out of my S4

A lesson learned from this time around, figure out how you are going to plug the braided stainless slave cylinder line BEFORE you install the product.  I wanted to leave the metal slave cylinder in place since I had put some RTV around the housing to keep dust from getting into the bell housing around the slave cylinder.  This meant disconnecting the AN fitting that goes to the metal slave cylinder.  With the stock unit I had a small tube that would slide over the end to plug it when disconnected, not so with this AN fitting.  After disconnecting the fitting and not having any luck holding the line up to keep the fluid in, or being able to find a suitable plug, I let the end of the line drain into a waste container.  Next time around I’ll have a proper plug to put on the end of the line.

Engine, Tuning

RS6 EGT Logs

I got around this weekend to installing some RS6 EGT’s in my S4.  Reason for these is that with some *minor* changes to the software the full range of exhaust gas temperatures can be recorded via the ME7Logger instead of only seeing EGT’s display when something is going wrong, which is the case with the stock EGT sensors and stock S4 tune.

Up front a word of thanks to Jonathan, Johnny Bravo, for the suggestion to do this and pointing me in the right direction when I got started.  At the tail end of the project Daz, DDillenger, was a *big* help in getting the software changes, something that required delving into TunerPro and XDF files in ways that I’d not done previously.

Here’s a look at the sensors fresh out of the box.

Audi RS6 EGT sensors going into B5 S4
Audi RS6 EGT Sensors for use in my B5 S4

After the hardware install and updating the ECU software I wanted to confirm that everything was working as expected.

Here’s how the EGT’s varied over a drive.

EGT chart for B5 S4 with RS6 EGT sensorsAnd then a pull just shy of 6500 rpm with K03’s.  This was the first pull to the 6000 rpm range that I have done since re-installing the AMD intercoolers.

AFR / Boost / EGT overlayThe chart shows AFR, manifold boost pressure, and the new RS6 EGT sensor readings.

All in all the project went smoothly thanks to the help I had.

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Minor update, a comparison with the ECU modeled EGT’s that normally are reported as EGT’s at the O2 sensor.

RS6 EGT sensor vesus ECU modeled EGT reading
RS6 EGT sensor reading vs ECU modeled EGT
Engine

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