Turbo boosting to 17 psi

[801_240sx]

HI EVERYONE IM NEW HERE AND JUST BARELY BOUGHT MY FRIST 90 NISSAN 240SX. I SOLD MY 95 INTEGRA FOR THIS 240SX AND THAT WAS THE BEST DECISION I EVER MADE. THE 240SX HAS A SR20DET REDTOP IN IT AND I NOTICE THAT I BOOST 17 AND DONT KNOW WHY. I HAVE A GREDDY BOOST CONTROLER HOOK UP BUT ITS ALL THE WAY DOWN. PLEASE HELP IM SCARED TO BLOW THE MOTOR LOL

[nissans13240sx]

Remove the boost controller completely and just run wastegate. 17psi is out of the turbos efficiency and definitly maxing your injectors out.

[801_240sx]

thanks for the help. but i did that already still the same thing. do you think it might be the boost gauge? i have a glow shift kind people said it might not read right? but i dont know

[mistamacadamian]

with the greddy hooked up it shows your boost also.

[peters14gc]

is the turbo on the s13 stock?

stock boost is 10psi.

the reading on the profec will be 100 for 10psi and 170 for 17psi, if you have it set to read in psi.

if you turn off the profec it should goto wastegate boost wich is 10psi.

if your turbo is not stock then ask the prev. owner.

it if is stock, you are way over boosting or you might have a bad boost gauge if the profec is reading correctly.

let me know if that helps.

[blinker_fluid]

You should remove (if not already) any after market and/or stock boost controller. Check all the vaccum lines. There should be 3 lines by the throttle body which go to the fuel pressure regulator, blow off valve, and the boost gauge. Also there is one vaccum line on the intercooler piping which goes to the waste gate. With that set up on a stock system you will get 7lbs. If you are boosting more than 7lbs then either the wastegate is stuck closed, the wastegate isn't getting a good boost source from the vaccum line, the turbo system is not stock (adjustable wastegate, bigger turbo, etc.), or your boost gauge is faulty. Don't drive on boost until you figure out the problem.

[peters14gc]

You should remove (if not already) any after market and/or stock boost controller. Check all the vaccum lines. There should be 3 lines by the throttle body which go to the fuel pressure regulator, blow off valve, and the boost gauge. Also there is one vaccum line on the intercooler piping which goes to the waste gate. With that set up on a stock system you will get 7lbs. If you are boosting more than 7lbs then either the wastegate is stuck closed, the wastegate isn't getting a good boost source from the vaccum line, the turbo system is not stock (adjustable wastegate, bigger turbo, etc.), or your boost gauge is faulty. Don't drive on boost until you figure out the problem.

whoops. he's right stock WG boost is 7psi..

sorry for the wrong info before.

[801_240sx]

i would like to thank you everybody that help. but i check all of the lines they are ok. now how do i tell if i have a bad boost gauge?

[nissans13240sx]

sounds like a bad wastegate. The wastegate should open at 7psi with no boost controller. Unless its aftermarket.

[DrifterProdigy85]

Definitly sounds like the wastegate line isnt hooked up right. Post a picture for us all so we can see its a vacuum line running directly from the Actuator to the Hotpipe.

[TTaylor]

i guarentee ur not boosting 17make sure u read your gauge right it just doesnt idle on 17

[rb25xtc]

now how do i tell if i have a bad boost gauge?

Swap it out for a known accurate one.

[IHeartRPS13]

Well you can also dyno that beezy, if you're getting more hp than a normal motor would (calculating in all of your mods) then its your wg, if you're not then its the boost gauge.