Wtf Is This....

[BackyardTurbo_FTW]

I have tried 2 MAF's and I get the samething while coasting in gear.

[roadconetuning]

idk but mine does something similar... it shows a slow ocilation while in dfco on the maf... my only guess is a harmonic and/or resonance from the turbo and whatever intake system you have... maybe we need to ADD a Helmholtz resonator to our intake paths... supposedly one of the reasons they have them on newer cars is limit resonance that would skew the MAF readings...

[BackyardTurbo_FTW]

I am running the stock airbox setup again. I have literally a DP and tune on the car anymore. I just drive it now lol.

[roadconetuning]

Umm... You have a small Gnome in your airbox with a can of compressed air then...

[BackyardTurbo_FTW]

LOL! Or a farting mouse? lol

[roadconetuning]

a belching frog perhaps?

[Iam Broke]

BPV oscillation? I don't see it on the MAF relocate on mine. Maybe it's where the pressures are almost equalized with the spring tension?

Other possibility is vibration but the frequency of the wave looks too low for that.

[BackyardTurbo_FTW]

If I am cruising and quickly go on and off the gas I can make it hiccup and it shows a weird blivvet on the MAF Freq. Ill post the screenie, I know it happened while I was logging.

[mkriebs]

Its most likely BPV oscillation. When I was having issues with a vacuum leak it would do that, since the BPV would flutter.

[rnjmur]

I get the exact same thing with my car.

[roadconetuning]

are you still running the stock rubber/plastic/trash BPV? mine stopped a lot of the bpv noises when i swapped to the forge unit.

[BackyardTurbo_FTW]

Still the stock shit, Ive thought about that Forge BPV but I have some "other plans" going on at my shop lately.... who knows what the future will bring

[roadconetuning]

my favorite response to the two parts side by side was from my dad "GM put that piece of shit in there?" lol