28psi of boost on a 14b?

[Sicotic]

I just got a new turbo think it is a 14b, but guy had everything for a 16g anyways i was wondering if my turbo is running at 28psi, bc i hooked up a boost guage and it builds boost about 1500 rpms and it has alot of power, i switch hoses for the guage and it still runs at 28psi. So i know its not safe bc everything i have is stock, so when im at high rpms(4500-5500) it will sometimes back fire or fall on its face.

 

[gsx7707]

that backfire is fuel cut and lean condition it wont run long like this turn your boost down and get some kind of fuel management system with injectors

 

[Fabian]

first of all. Do your research online and find out what turbo you have. vfaq.com has everything you need to know to identify what kind of turbo it is. Second, why in the world would you max out a turbo that you have no clue what it is? 2nd of all, I believe the 14b is known to max out at 22psi. I'm not 100% on that though. Dont you have a boost controller or boost solenoid? The car falling on its face is probably fuel cut, or your motor screaming at you for being mean to it.

 

[Blaze2gDSM]

I really hope your turbo Is not running at 28psi with no other mods. First things first, make sure you are running the source for your boost gauge at the right spot. It should be running off the fuel pressure solenoid located in the back right corner of your engine bay. It should be t'd into the line that runs from the manifold to the solenoid. If that checks out its time to pull the intake pipe and most of the turbo. remove the intake pipe and your fans to give you some room. Unbolt the actuator and make sure the arm for the flapper moves freely once its removed. If it checks out I would pull the chra out. Just unbolt the 10mm nut from the vband connection and carefully pull the chra out of the housing. (you may need a lil tap with a mallet. Inspect it thoroughly check the vfaq for how to tell. I would suspect its the gauge though first off. If you were really running 28psi you would have hit fuel cut already and your car would barely be dogging it around town. Does the gauge immediately go to 0 when turned off, how much vacuum does it read at idle? Sorry for the long reply just running through all the possibilities I can think of. It shouldn't take you longer than an hour to check everything above.

 

[Sicotic]

i dont have a boost controller, i took off my old 14b and looked the same. if i can turn it down let me know, also is it bad to drive the car like this?

 

[Sicotic]

I really hope your turbo Is not running at 28psi with no other mods. First things first, make sure you are running the source for your boost gauge at the right spot. It should be running off the fuel pressure solenoid located in the back right corner of your engine bay. It should be t'd into the line that runs from the manifold to the solenoid. If that checks out its time to pull the intake pipe and most of the turbo. remove the intake pipe and your fans to give you some room. Unbolt the actuator and make sure the arm for the flapper moves freely once its removed. If it checks out I would pull the chra out. Just unbolt the 10mm nut from the vband connection and carefully pull the chra out of the housing. (you may need a lil tap with a mallet. Inspect it thoroughly check the vfaq for how to tell. I would suspect its the gauge though first off. If you were really running 28psi you would have hit fuel cut already and your car would barely be dogging it around town. Does the gauge immediately go to 0 when turned off, how much vacuum does it read at idle? Sorry for the long reply just running through all the possibilities I can think of. It shouldn't take you longer than an hour to check everything above.

the vaccum is t'd up to the solenoid, the vac on the gauge is about 15-20, it doesn'tdrop off instantly but usaully goes to the vac side. i dont have a clue what your are talking about the wastegate.

 

[Blaze2gDSM]

Its horrible to run the car like that. You are overrunning the turbo, pushing superheated air in to your car (if u are really making 28 psi) and running on fuel cut at all times.

 

[Sicotic]

Its horrible to run the car like that. You are overrunning the turbo, pushing superheated air in to your car (if u are really making 28 psi) and running on fuel cut at all times.

i just got done with the build on the top end today was the first day i finally got to drive it. the stock gauge shoots builds up fast to the 14 and just sits one i drive hard.

 

[Blaze2gDSM]

Look at a picture of a complete 14b. The actuator is the rod with the bov looking top. It has a vacuum line connected at the top. Follow the rod to where it connects to the turbo. It will be held on by a little clip. Pull the clip and remove the two 10mm bolts that mount it towards the top on the compressor cover. Wiggle the little arm that you unclipped the actuator from. All you are checking is if it moves freely.

 

[Sicotic]

Look at a picture of a complete 14b. The actuator is the rod with the bov looking top. It has a vacuum line connected at the top. Follow the rod to where it connects to the turbo. It will be held on by a little clip. Pull the clip and remove the two 10mm bolts that mount it towards the top on the compressor cover. Wiggle the little arm that you unclipped the actuator from. All you are checking is if it moves freely.

i know what it is but il;l check that.

 

[Blaze2gDSM]

At idle your gauge should read around -15to -20 vacuum so you are ok there. The stock boost gauge is useless so ignore it. When cruising and not accelerating, just maintaining speed your gauge should still be around -10. Is this correct?

 

[Blaze2gDSM]

If you have no controller installed it will only build boost to what the actuator is set to which I believe on the 14b is 12 psi unless the actuator is not opening. Make sure the vacuum line on the top of the actuator is connected and isn't cracked or split anywhere.

 

[Sicotic]

At idle your gauge should read around -15to -20 vacuum so you are ok there. The stock boost gauge is useless so ignore it. When cruising and not accelerating, just maintaining speed your gauge should still be around -10. Is this correct?

yea, only when i start to go around 2000 rpms it will got to avout 5 then higher after that but when i cruise it is fine.

 

[gsx7707]

look into the cold side of your turbo its easy to tell a 16 from a 14 blades are different andyeah you will blow your engine quick that way

 

[Sicotic]

If you have no controller installed it will only build boost to what the actuator is set to which I believe on the 14b is 12 psi unless the actuator is not opening. Make sure the vacuum line on the top of the actuator is connected and isn't cracked or split anywhere.

Thats what i thought but i put a brand new gauge on an it goes still at 28psi..

 

[Sicotic]

look into the cold side of your turbo its easy to tell a 16 from a 14 blades are different andyeah you will blow your engine quick that way

can i see pics of deiffereces

 

[Blaze2gDSM]

Its gotta be the either the flapper not opening, the actuator is bad or the vac lines connecting the the actuator are bad. I'm not saying it can't be anything else but these would be the three most obvious things if the gauge checks out. One more thing to check, check and see if your acuator is threaded new the top. If it is stock it should have no threads on it.

 

[Rob10_99]

You can get a hand vacuum/pressure pump cheap and see exactly when your wastegate cracks and opens fully. It sounds like its way out of adjustment or doesn't open at all.

 

[Sicotic]

how would i use the hand pump i have already.