https://www.nopistons.com/forums/pub...#>/biggrin.png

https://www.nopistons.com/forums/upl...1023349608.jpg

what is this mod supposed to do?

It just lets you use a different air flow meter in your car. The 89-91 air flow meter supposedly flows a littled better than 86-88.

Now this is a great mod. I hate those crappy flapper boxes!

silly idea, would take a lot of monkeying around to make it work:



split the intake pipe (think Y splitter) and stick the AFM on one leg, and a plain old cone filter on the other leg. reduce the spring preload on the AFM so that the door moves easily, then try your mightiest to get the AFM output to actually represent the amount of air sucked through both the cone and the AFM.



oh, and make sure you're trying this on a NA car https://www.nopistons.com/forums/pub...DIR#>/wink.png

whoah, sorry for the threadjack. thought i was posting in a diff thread. https://www.nopistons.com/forums/pub...IR#>/wacko.png

isn't the s4 afm more wide range? in that aspect, isn't the s4 better (even if it doesnt flow as well) ? my question: is the s5 ecu able to handle the wider range of the s4 afm?

it doesnt work. tried it. wouldnt start, cut the wires, did it again... car woudlnt start. checked everything over again... car wouldnt start, soldered the wires back to stock s4, started right up. and s5 afm came off a runing car so it wastn messed up.

I followed the instructions the best i could, but my car wouldnt start. Frustrated, I whipped out the trusty manual and compared wiring diagrams between the two series(s4/s5) and made my own wiring decisions, pulled codes and made more wiring changes.



so here it is kids, the definitive wiring instructions!





...........S4................................S5... ..........

GRN/ORG...............+.........GRN/ORG

............BRN/BLK+BRN/BLK.......................

............BRN/BLK+BRN/BLK.......................(join these four wires together)

GRN/BLU................+........GRAY(green wire inside gray insulator)

BRN/WHT...............+........BRN/WHT

BLK+BRN







note: my car has a 87 wiring harness-- according to the book the wiring is different between 87 and 88.



Taken from ASSGRABBER, This is the CORRECT WIRING.

so what exactly is the benefit of an S5 AFM? We commonly upgrade in the DSM community from the 1st generation ones (really restrictive and caust boost cut easily) to the 2nd generation ones (3.75" inlet and outlet, and responds better to tuning)...does it make sense to use one with a stock turbo car?