JasonAndreas

Wow for catalytic converter efficiency and O2 aging flags the engine load factor of 0.9-3.5ms at the RPMs listed means you are barely touching/opening the throttle at all. At 800-880RPM the ISV will open enough on its own (51-53%) to push a load factor of 2.0-2.1ms.

Slow Guy

Thanks Geo, it will be interesting to compare this to the drive cycle routine.
1000 sec, so with the tester you could do this in under 17 min.

Slow Guy

I know this is way beyond my abilities but how do you measure Load Factor?

geolab

I am not sure I met the german guy Alzheimer yet, but if I did, I wouldn't be sure neither.
The little I recall from engineering classes back in the late eighties,
engine load is expressed in percentage.
What is meant in the technical bullitens is that for every unit (catalytic converter, O2 lambda, Mass air flow, Idle control valve) an intermittent engine load is calculated by each element, to determine its role or rate of action.
for example, a 2.1millisecond for Idle control valve, is that the engine load is calculated every 2.1 millisecond, and that for 40 seconds for example.

they meant without the tester its 1000 seconds, with the tester, its done automatically
by the PST2 and you do not wait and the 1000 second proceedure is surpressed/omitted

JasonAndreas

You can use a Bosch Hammer, Porsche System Tester 2 or PiWiS.

Bosch Motronic is little different and expresses load in milliseconds. It's the theoretical amount of time that the fuel injectors are kept open to keep the air-fuel ratio at stoichiometric (14.7:1). This is number is then used with the cylinder head temperature, intake air temperature, crankshaft angular velocity and the O2 dwell ratio to calculate the actual fuel requirements.

Lorenfb

"how do you measure Load Factor?"

Check here for 993 & 996 PST2 DME data:

www.systemsc.com/tests.htm

hddude

After two days and about 100 miles of putting around town at 2000 rpm, the car was tested for smog. I tried to follow the routine suggested here within the constraints of an urban environment -- stop lights, traffic etc. I couldn't follow the routine very well but maybe well enough. It had been 5 weeks since my battery change, so I do suspect trying to follow the routine did matter. One major difference the past two days was always driving below 3000 rpm, something I would never do on purpose but for this procedure.