Continuing the effort to be able to record the MAF sensor correctly I have begun to try and modify an engine harness and OBD port to use on the flow bench.
Here’s the progress thus far:
Progress with the Nefmoto community 2.7T Stage 2 tune has spurred my curiosity to find out why the results I’m seeing with a Hitachi MAF equipped car are significantly different from two others car that are participating in the tuning project, but are equipped with Bosch S4 MAF sensors.
I don’t have an S4 Bosch MAF on hand, but I do have a Bosch RS4 MAF, which I decided was close enough to try out in order to see if the car behaved, or rather logged, much different than with the S4 Hitachi MAF.
With that end in mind I replaced the stock airbox with a RS4 airbox, the Hitachi MAF for the RS4 MAF, S4 and RS4 accordion hoses were also swapped, and the stock y-pipe was pulled to allow the RS4 accordion to attach to an RS4 y-pipe.
After the hardware was swapped and I verified that I was getting a good reading from the sensor using a first draft of the revised tune, I began to look more closely at the tables that needed to be tweaked in the ME7 code.
A few that need to be changed are:
The KFKHFM table is turning out to be one of discovery, I’m needing to adjust this table quite a bit more than I had expected in order to richen up the AFR.
Today I got around to installing the Silly Rabbit Motorsport B5 S4 SMIC’s. These have the RS4 sized inlet and outlet piping along with water/methanol bungs for use with the Aquamist injection nozzles.
The mounting tab on the top end tank is a nice feature for holding the intercooler steady.
For now I’ll be using them without the shrouds. I have them but decided to hold off installing them until later.