Re-Circulating Dump Valve - Before Or After MAF?

[sideways danny]

Originally Posted by s13eater

twin piston dump valve does'nt upset the ecu though, the idle goes up and down on normal valves, or you can put a one way valve into the vaccum line, i think you t off, its like the little valves on the mk2 washer jets, that sorts it out.

does upset things if you have an AFM. You'll get very rich fueling on gearchanges, which will cause hesitation and possible misfires