Turbo discharging????

[mcktrucking]

Turbo discharging is the only way i know to describe it. Doesnt matter if i have my foot in it or not. The boost will drop while i hear a whoosh noise and then come right back up. It doesnt do it all the time and there is no ryhme or reason. Took it to the dealer and they replaced turbo seals but said everything else was fine. Is it something that can cause long term damage or is it normal. Any help would be awesome.

[TwinTurboStroker]

It does it at idle too??? What mods do you have done to the truck or is it stock?

[mcktrucking]

Banks cold air intake but it did it before that was installed other wise its stock. Not at idle but just cruising easy 8-10 on the boost and then when u accelerate also.

[TwinTurboStroker]

Is there any chance you might be hearing the VGT vanes opening and closing on the turbos???

[mcktrucking]

Maybe, would that make the boost gauge drop. It does it multiple times in a row and then sometimes not at all.

[TwinTurboStroker]

Its possible..........anyway you can get video of this???

[nlcougar]

Might be a little late but... are you in regen? Mine does the same in regen. At a constant acceleration you will see the boost rise to about 15-20 psi, hear a whoosh and see the boost drop into the low single digits.... then rise again. This only happens when I'm in regen though.