[s-cars] RS2 MAF deliberations

[TODD KRAMER]

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Fellow S-listers, my experience:

Test Mule:
1995 S6:

RS2 Turbo K26hot/K27cold,
RS2 Exhaust Cam
RS2 Injectors
RS2 FPR
RS2 MAF

Lehman RS2 Software
2=2E5 Bar Boost MAP

During my build, I came across an RS2 MAF at a good price and put it on my =
ride before I upgraded to RS2 Fuel Injectors and Fuel Pressure Regulator (f=
uel delivery "set").  My A/F meter ran really rich under overboost but buck=
ed and hiccupped as if the O2 sensor and the MAF were playing tug of war wi=
th the mix.  My diagnosis, the MAF is metered for the proper injector regul=
ated by the proper FPR.  Once those parts were upgraded, the car ran as exp=
ected.

To test my theory, because of this thread, I swapped my old MAF into the RS=
2 setup and found the car ran lean . once again, the MAF was not calibrated=
 for the injector/FPR setup.

More air gets more fuel until the O2 sensor does not like what it is tastin=
g . then the ECU tries its best to keep the damn thing from blowing itself =
up.The electronic signals from the MAF are paired to the flow rates of the =
associated injectors the ECU is expecting.

So . without boring the audience with measurements of wire diameter or plas=
tic thickness processes, my recommendation is upgrade the fuel delivery sys=
tem as a set (MAF, Injectors, FPR).

.and all because I stayed in a Holiday Inn Express and chose to check my em=
ail.

Todd Kramer
Salt Lake City (5700 feet)

1995 S6
1995 Cabriolet