Yesterday my 86.5 was due for the annual check (called APK) in Netherlands.

Car passed with flying colors, also the emissions test was perfect, CO percentage was just 0.1% where 1.5% was allowed.

Before fitting the porken chips and adjusting the MAF it would barely pass the CO test.

I am really happy with the results, car drives great and is good to go for another year :-)

Cheers
Michel

 

Congratulations. Enjoy the ride.

 

How did you 'adjust the MAF'?

 

The 85-86 has a wired connection to the Mass air flow sensor (all of which have the adjustment screw) but on 87 and newer 928s it does nothing.

 

Correct, my car has a potentiometer on the MAF which is used to adjust mixture on idle if I remember correct. The s300s chips also use it at WOT, and after installing the chips I discovered it was not set correctly, the car was slower with WOT compared to part throttle.
I adjusted it with Ken's instructions and it transformed the car in a very good way, which was confirmed by the emissions test.

Cheers

 

Congrats from Groningen!

 

Just passed CA smog test today. It is called FMMP for (f me more please) . Our CO% max is 0.93 at 15mph and 0.73 at 25mph. Mine was 0.47 at 15mph and 0.04 at 25mph.

It is a good thing, testing, because I remember wrapping a cloth around my mouth like a bandito when traveling up to the City of Angels back in the 80's.

How does adjusting my AFM affect a SMOG test?

Not that I would do that of course. Just curious.