Boost will not exceed 5lbs

[axloverstreet]

ok, i thought my turbo was bad.. so i was told to take it off and check it for shaft play.... before then i COULD push up to 24lbs of boost with a 14b bolted to a ported evo III and ported o2 housing.... so i did and it has a tiny in and out.. and a little side to side... but b4 this the dipstick popped up during high boost and covered my engine with oil on the highway and so it smoked and i thought i blew it up ... well somthing happened cause it runs like crap now and wont start half the time... well that was along time ago and im tired of getting a ride to school.. so i decied to start driving my undependale car , so anyways it only wants to push 7-8 lbs??? i have boost contol, but even if i turn it way down or way up itll still only push 7-8 lbs........ idk, but when it gets to its 8 lbs i can hear it REALLY LOUD.. well it hit me today that i could possibly have a boost leak... but idk, any help would be awesome so thanks in advance

im going to try to post the vaccume route i reran it

 

[benjimatt]

do a boost leak test

 

[axloverstreet]

do a boost leak test

ok, ill try to do that tomorrow and let you know the results

 

[benjimatt]

sounds good. good luckk

 

[Bluefire16]

Well if you have read that is not a good way to hook up a manual boost control. I have to run it this way because i have been busy and not been able to tap my jpipe. I recommend a alternate route of wiring your mbc. Aside from that, a boost leak test is essential. You said you took off your turbo? To check for shaft play you do not need to completely remove the turbo. Did you bump or drop the turbo? Maybe set it down on the wastegate actuator? Check the arm on the actuator and the housing itself. If you dented the actuator this could be your problem. Mine was crushed, and wouldn't build boost over 9 psi. Let me know if you have any luck.

 

[DSM4me44]

One thing you will want to be careful of is that you say you can hear it REALLY LOUD. If you do have a boost leak or something, that turbo could be spinning really fast and potentially building x amount of boost and all your reading is 8 lbs. So even though you only gettin the affects of 8lbs, your turbo could be working really really hard. So until this problem is figured out, it wouldn't hurt to run stock boost. Run the line straight to your WGA and you should run around 11 psi when things go right.

 

[sschambers]

You were running 24psi on a 14b? That's a bit too much to begin with. I think anything after 19psi you're turning it into a hair dryer (blowing hot air).

Check to see if the vac line for the boost controller is still attached.
Check for a faulty wastegate actuator.
Check for vac/boost leaks.
Turn the boost down, 24 is too much on a 14b.

Also, one thing I've noticed. I've gone through A LOT of turbos, and all of them suddenly got super loud right before they crapped out...So be careful, your turbo might be on its last leg. I've noticed this mostly on smaller turbos. When I blew the T-25, it made the loudest spool sound ever it was ridiculous, but sounded pretty awesome .

 

[dan catalyst]

did you check your wg housing for cracks when you had it off?

 

[spawn87]

i dont know if im wrong here so if i am call me on it... but you dont have to take the turbo off to check for shaft play just the intake pipe.

as for the 24psi you might of already worn the thing out so turn your boost down

re route your mbc its not good to share sources when it comes to bov and bc.

check your boost guage could have gone out on you.

and yes do a leak test that pretty much solves 80% of boost/vacuum issues.

 

[spawn87]

One thing you will want to be careful of is that you say you can hear it REALLY LOUD. If you do have a boost leak or something, that turbo could be spinning really fast and potentially building x amount of boost and all your reading is 8 lbs. So even though you only gettin the affects of 8lbs, your turbo could be working really really hard. So until this problem is figured out, it wouldn't hurt to run stock boost. Run the line straight to your WGA and you should run around 11 psi when things go right.

im just wondering because i just installed a 14b(ported w/tubular o2 housing) on my 2g and im only getting 8-9psi running it strait to the wg. and if i do turn it up it pops my dipstick out also or leaks through my oil cap...Y?

dont mean to thread jack just though i fits in

 

[axloverstreet]

im just wondering because i just installed a 14b(ported w/tubular o2 housing) on my 2g and im only getting 8-9psi running it strait to the wg. and if i do turn it up it pops my dipstick out also or leaks through my oil cap...Y?

dont mean to thread jack just though i fits in

yea i was told that most dsm have the dip stick and oil cap problem they told me to run an oil catch can and change your pvc valve

 

[spawn87]

pvc valve?

 

[ClevelandDSM]

PCV I assume he meens. Do a search on it.

 

[DSM4me44]

Also, one thing I've noticed. I've gone through A LOT of turbos, and all of them suddenly got super loud right before they crapped out...So be careful, your turbo might be on its last leg. I've noticed this mostly on smaller turbos. When I blew the T-25, it made the loudest spool sound ever it was ridiculous, but sounded pretty awesome .

This is very true. I was on the highway and boosting like usual. Well all week the turbo was getting a bit louder. Then after a boosting session, BANG. I can't build boost and half the highway on both sides is covered in smoke. Long story short, my turbine wheel snapped off and went into my exhaust in pieces.

 

[nedmonds86]

Ok so I go to lunch at work the other day, im cruisin down telegraph trying to decide where to eat. I glance at my boost gauge and i'm boosting 3 ####ing PSI! I had my MBC set at 14 psi. So i figure I had some hardcore creep or something because I had not been paying attention to it for a couple days. So i rip out my MBC and hook up my stock WG solenoid. Still 3-4 psi.

So i spent my whole lunch messing with it, thought it was my BOV. BOV is fine. No boost leaks, i checked. Then it gets weird, i was driving home and bam, 15 psi for a couple miles. Then back down to 3-4. Anyone know whats going on here? My motor is a stock cammed out 4g63 with the stock turbo.

No smoke from my turbo, its a very strong turbo and it has never had an issue with 14psi, it will even pump out 16 no prob.

So, no boost leaks, BOV is fine, removed my MBC. Im thinking Vacuum leak around my WG solenoid, any input guys? Or maybe my actuator arm is stuck? I can move the arm with my hands if I force it but it seems tough, I have no idea how hard it should be though... Should it move freely with the engine off?

 

[snowborder714]

Have you tried checking the actuator arm with an air compressor? Just go right into the wastegate and see what happens.

 

[djalogik]

it shouldn't be that easy to move the actuator arm nor should it move freely even when the car is off. You might wanna take your intake out and check your turbo for shaft play also.

 

[nedmonds86]

Well i almost ran it out of gas and i put in a 1/4 tank of 93 octane shell gasoline. My boost jumped to 7psi and seems to be improving. Will a low octane fuel affect my boost? I know my engine adjusts the timing accordingly...

 

[Bluefire16]

i dont know if im wrong here so if i am call me on it... but you dont have to take the turbo off to check for shaft play just the intake pipe.

as for the 24psi you might of already worn the thing out so turn your boost down

re route your mbc its not good to share sources when it comes to bov and bc.

check your boost guage could have gone out on you.

and yes do a leak test that pretty much solves 80% of boost/vacuum issues.

Thank you for re sharing all my information i just gave him...

 

[spawn87]

welcome

 

[dan catalyst]

its best to take the turbo off when checking for shaft play.the hot side will almost always have more shaft play, so i guess check the cold side first by just removing the intake pipe,and know that the exhaust side will have more play.
p.s.,make sure the wg is working properly and isnt hung open a little too b4 taking it all apart again.good luck and it cant be that bad,worst case you can always close it up and run a external wg if you find cracks.