Re-Circulating Dump Valve - Before Or After MAF?

nedge2k · #1 02-09-2009, 13:03

...I would assume after as the air has already been metered? Thoughts anyone?

CNHSS1 · #2 02-09-2009, 14:39

after (between AFM and throttle body), or the poor ecu will get upset

30psi · #3 02-09-2009, 18:39

Craig you mean between afm and turbo I think

That's how I'm gonna do mine anyway

nedge2k · #4 02-09-2009, 18:48

cool, cheers guys. performance wise, i suppose the closer it is to the turbo the better? or would there be a risk of damage to the intake impeller - force of the air bending the blades out of shape?

s13eater · #5 02-09-2009, 19:47

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.

CNHSS1 · #6 02-09-2009, 22:36

Quote:

Originally Posted by 30psi

Craig you mean between afm and turbo I think

That's how I'm gonna do mine anyway

sorry, yes, was being a 'tard

sideways danny · #7 04-09-2009, 01:18

Quote:

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