turbo pressure

[tyfoo]

used the search on overboost and someone said that at a idle the turbo is at 9psi
that would make my gage in the middle of the green and yellow zone?
mine is -15 and while driving its low only when i get on it it works its way in the yellow

my promblem is the waste gate rod is adjusted all the way.
holding on by 1-1/2 turns from the end

and i,m still overboosting

how can this be??
need help

 

[protosy]

Re: turbo pressure

used the search on overboost and someone said that at a idle the turbo is at 9psi
that would make my gage in the middle of the green and yellow zone?
mine is -15 and while driving its low only when i get on it it works its way in the yellow

my promblem is the waste gate rod is adjusted all the way.
holding on by 1-1/2 turns from the end

and i,m still overboosting

how can this be??
need help

first, the stock gauge sucks. second, at idle you should be in vacuum 12-14 inches maybe.

if i am not being silly here, the middle of the stock gauge is supposed to be 0 vacuum, 0 boost neutral pressure.

why do you say you are overboosting? are you getting a code? are you seeing it on a aftermarket gauge?

chad

 

[SeattleSy#1255]

if your truck is stock, the WG is my oppion is anemic at best...it flat out sucks and boost control stinks.

 

[tyfoo]

yes i'm getting a code. even with the wire disconnected at the reg.
and rod holding on by a thread

what would cause neg pressure at idle
would this have soming to do with my rough idle

 

[SyTyJedi]

What code are you getting?

Negative pressure is vaccum, and is normal. When your engine is not in boost, it's in vaccum. My truck would be around 16" of vac at idle. First thing to do is get an aftermarket gauge so you know what you are boosting at. Looking at the stock gauge is about as accurate as closing your eyes and guessing.

 

[BigBadSmoosh]

my stock gauges is dead on with my datamaster runs

 

[ghettosled]

if you disconnected the wg selenoid it should make 8psi. WIth the rod all the way out it should make even less.. the only way that it would still be overboosting is either (1) you have no cat or open exhaust or (2) your wg flapper is not moving freely. My bet is the later of the two senerios. But before you do anything install a good mechanical boost gauge b/c factory WOT is 14 psi.