boost drop off at WOT?

[fatdoug]

so i went out for my bi-weekly "cane on my truck for an hour" drive. and i noticed that at WOT on the flat at around 2800-3000 rpm, my boost starts to drop off from 25 plus to 15ish. is this normal? and on a side note, when i really get on it my scangauge reads boost up to 25, then throws out a negative number i was seeing -10 to -12? wtf is up with that? any help or info is appreciated.

Doug

[WarChild]

Try tightening all you clamps. I would recomendd taking all your boobs off and cleaning them and then tighten them down really good.

[Evil Eye]

Originally Posted by WarChild

Try tightening all you clamps. I would recomendd taking all your boobs off and cleaning them and then tighten them down really good.

Quoting so you can't change it later...

Freudian slip??? Got something on your mind???

[WarChild]

Damn auto correct....lmao

[Evil Eye]

Just messing, man.

[a2elvis]

Mmmmmm.. Boobs....

[WarChild]

Originally Posted by Evil Eye

Just messing, man.

Everyone loves a good boob cleaning.

[Zeek]

Originally Posted by WarChild

Everyone loves a good boob cleaning.

You wouldn't be human if you didn't!

[a2elvis]

I have seen the Scangauge go into negative numbers on boost, but it was only over 25psi of boost. Not sure if the X-gauge isnt right for the truck or what.

As far as the loss of boost could be as simple as a boot(boob) or maybe an intercooler tank leaking under high boost numbers.

[Evil Eye]

I have noticed that mine will drop off sometimes as well, but no noticeable decrease in power. It's more evident when I tow my 5th wheel all loaded up, but that could be because I'm running my tow tune. I just figured that the PCM was determining that the VGT didn't need to be running that much boost, opened the vanes a bit and dumped off some boost. Like I said, I didn't notice a decrease in power when it happens.