Engine/Transmission (1998.5 - 2002) Wastegates, PSI's, and codes

[TMWeber]

OK guys I need some help understanding this stuff. On a stock turbo (let's say mine), HY35 the wastegate opens at I think 20lbs boost right? This is to prevent damage to the turbo and/or setting off codes. If I put in a boost fooler, I can get more PSI but I won't set off codes, what about damage to the turbo? What PSI is considered max without doing damage? What happens when an over boost code is set? I am just curious, I know that air is just half the ingredient for power and I'm not going there right now just wondering about the whole turbo/wastegate/PSI thing. Thanks

 

[Partyat33]

Damage to the turbo, its all a matter of degrees. When you go over the stock boost setting of 20# you take a risk. How big, depends on how high you go. Most will tell you that high 20's and low 30's are safe. Much higher than that and you are putting a big strain on the turbo and potentially risking other components, like your head gasket. Some have run much higher numbers without problems, others have not. If you set a code you set a code. Nothing to worry about.

 

[TMWeber]

That's simple-Thanks

 

[wtfd6]

my truck only gets 17 psi. sometimes it will get 19 for a moment with a trailer and almost full throttle. is this normal?

 

[Partyat33]

my truck only gets 17 psi. sometimes it will get 19 for a moment with a trailer and almost full throttle. is this normal?

Sounds about right.

 

[MKizziah]

my truck only gets 17 psi. sometimes it will get 19 for a moment with a trailer and almost full throttle. is this normal?

I have normally had 18-20 pulling hard with stock turbo. I put a BHAF on and BAM 22psi. . You may have a restriction caused by your air filter plugged up. If you can't suck the air in you won't get the boost. Same senario if you have a restriction in the exhaust also. As I've read here, wriiten by many wiser than I, "The Diesel engine is basically an air pump, they love to breathe"



Cheers,

Matt

 

[wtfd6]

just changing the stock air filter to a k&n made a big difference. I gained 1psi and spooling doesnt take as long. i will be looking into a bhaf and exhaust very soon.