jacob4lester

ok for some reason my car does not build boost. here are some things im thinking of why its not building boost.

1. i was running an open downpipe but i just got it all together but havent driven it yet so maybe there wasnt enough back pressure?

2. i have a tial wastegate and on the top there a threaded hole and someone told me that theres supposed to be a boost controller there so it may just not be holding boost?

3. someone said my bov was missing the actual valve but i dont know how to tell its a greddy rs.

my boost gauge just stays on vaccum doesnt go to the boost at all but the turbo still spools up really loud, well at least it did without the exhaust welded, any advice will help guys, thanks.

VtecCarHauler

-Major leak in the charge system. (BOV, loose hose connection)
-wastegate open (on tial wg the port under the dia should be hooked up to a boost reference)
-open exhaust is not the problem (back pressure is a turbos enemy)
- Be careful when you are testing just in case you fix the problem. Let off when you hear the turbo making noise.

timmy tegra

Im not trying to sound like a *** but have you even checked to see if you blew a coupler off, thats what it sounds like. And on the bov just take it off and look at the bottom and if there is a valve there you will see it, i had the some bov as you.
Open downpipe is not a issue as posted above, just let your car idle and check all your couplers to see if they may possibly have rips/cuts in them.
And the wastegate the top bolt doesnt matter, its only if you are running a boost controller.

K7-1Ktrevor

sounds like some one bought a turbo car without knowing anything about it.
only way to learn is digging through it and figureing it out yourself. also get it retuned if you just cut your exhaust off cause its going to be running leaner now. lean= blown up motor

timmy tegra

x2 , sounds like you got in over your head on this one.
question for OP, is the car tuned at all?

jacob4lester

no not that i believe, i got the car from a friend for only 3500 just so i could have someting to work on and mess around with. there arent any loose connectors that i am aware of. my bov has two nipples on it and one of them isnt connected to anything and the other one im assuming is for the boost gauge so is there something that it should be going to? turbo spools up around 3k but theres no blow off. front mount is connected one side to the intake manifold and the other side is going to the bottom of the turbo

timmy tegra

Can you get me a picture of your bov so I can see exactly what nipple you're talking about, because my greddy rs never had 2 nipples.

Have you checked to see if your wastegate even has a spring inside it? Id check that out as well.

timmy tegra

And you run the bov vacuum line (which connects to the nipple in back of the bov) you run a vacuum line from that to some sort of line that pulls vacuum. Then you would use a T fitting and put that in the bov line to run a boost gauge.

jacob4lester

yeah the vaccum line that comes off the bov runs to a t-fitting. i believe that my bov is stuck open so i am getting a 20 dollar rs one off of ebay to see if thats why, and if it is then its time to upgrade. can anyone suggest the cheapest decent manual boost controller? and how would i check that my wastegate is functioning correctly? ill get some pics up tomorrow of my set up

timmy tegra

Just take a look inside your bov with the car idling and see if its closed or open before you go out and spend money. I bought a turbonetics boost controller for $40 and never had a issue with it, take your wastegate off and push on the valve and see if it has any tension against you pushing it, if it doesn't then you have a faulty wastegate, could be the spring is messed up..what psi is the car set to run at? but give those a try and let us know.

TehGhett0P1mp

Also make sure the diaphram is not ripped on the wastegate as well because that will cause issues.

jacob4lester

alright ill do that. the bov looks stuck open so idk if theres a way to unstick it? i just picket up an rs pos one off ebay for 17 bucks so i would be able to tell in a few days, if the wastegate has a bad spring is the spring replacable or do i have to get a new wastegate?

TehGhett0P1mp

if the bov is stuck open take it apart and see why its stuck...and you can order the parts from tial I believe if it is torn or at the very least get them off ebay.

timmy tegra

The spring in the BOV could be in a bind. Yes, you can replace the spring in the wastegate, just make sure you get the right spring for the right psi you will be running, And be VERY carefully when putting it back to together, it wouldnt be hard to rip or pinch the diaphram inside the wastegate.

K7-1Ktrevor

noob section. let us know when you blow it up!

jacob4lester

alright today i got it to build a couple pounds in 4th gear, all of the pics of the tial wastegates i see have a screw lookin thing in the top of it and mine does not have that. i was told my bov is working fine a family friend put a lit cigarette in front of it and hit the throttle and sure enough a little bit of air came out of it, some debris came off of the cigarette. this is an example of what im talking about with the wastegate


looks like a line runs off of the top. i took off thetop and checked the spring and it has plenty of force when i pushed on it

K7-1Ktrevor

with a w.g. like that you will only need a line hooked up to the lower port. the top port is for a boost controller.

lyncoors

leave the top open and hook your boost line to the bottom nipple

jacob4lester

ohh alright. its still just baffling my mind why its not building boost, well i should be getting my pos bov in the mail and we will see if thats the problem

K7-1Ktrevor

do you have any exhaust leaks at or around the turbo, I had a b16 turbo motor that wouldn't build boost due to the 5 bold d.p. flange missing a gasket so the hole for an internal w.g. was leaking exhaust gas.

jacob4lester

well i just welded my exhaust together today and it only built boost once but before i was running an open downpipe, think that was why?

K7-1Ktrevor

no, exhaust restriction wont stop it from building boost. but any leaks befor the turbo will, just like the wastegate being partially open...

when the w.g. opens up, it lets out exhaust gas, thus causing the turbo to quit spooling. if you have leaks before the turbo it will do the same thing.

jacob4lester

didnt seem like anything was wrong with teh wastegate. diaphram seemed in good shape and the spring had a lot of resistance, one of my friends say that since my car isnt stock turboed i may need to get a boost controller, that true?

K7-1Ktrevor

no. please don't listen to that friend. he doesn't know a turbo car from his *** hole. the w.g. has a certain spring in it which will regulate the boost (6lb 8lb, 10lb...etc) then if you want to up the boost you will need a boost controller to up it any more then the w.g. spring. have you gone through the car and looked for ripped couplers?

K7-1Ktrevor

post some pics and maybe I can help you a little more.