dump valve, whats happening?
#1
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dump valve, whats happening?
hiya all, just had a fmic fitted and noticed one big chage, my dump valve used to go tssssss but now it goes tssss tsss tsss tss ts
any ideas on this?
any ideas on this?
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My HKS SSQV (standard mount on TMIC) causes a chatter at lower boost, only fully opens at high boost. Whether, like Davey says, it's actually not opening sufficiently to vent and the chatter is the turbo blades being stalled by back pressure I dont know. Think I'll stick my recirc back on tho.
#5
The noise is because the dump valve cannot dump the entire contents of the larger volume FMIC quickly enough. The air is then forced backwards through the turbo and through the MAF. I bet you get a judder when easing off the throttle sometimes? This is air going back through the MAF and confusing it causing the ECU to add fuel. At a recent mapping session, Andy showed me this in graph form on his laptop. Going back to a standard recirc will usually cure the problem to a certain extent.
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