16g swap 2psi boost? Check it out please

[razrman8]

Installed my EvoIII 16g today.. Took it out for a test drive and I seem to be only building 2psi boost. Everything is stock except for my Injen intake and bov. Stock exhaust, injectors, all that. I swapped the turbo from a t-25 because I could only build 7psi with it. Took it off and found a crack that I didnt know if it would be a problem at all. Now after swapping I am only getting 2psi. So I'm not sure if whatever my problem is has magnified because of the 16g or what. I also notice that I could hear my t-25 spooling up through the intake a lot louder. The 16g I can't. Probably cause I am builing only 2 psi. What do you guys think.

**BLT HAS BEEN PERFORMED DIRECTLY AFTER SWAP
-Notice a slight his from throttle body shaft seal

 

[96awd]

I would tune it. I threw a 16g on my little bros old gst and it needed a tune period. How is yor acceleration? Any cutouts or anything?

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[razrman8]

I would tune it. I threw a 16g on my little bros old gst and it needed a tune period. How is yor acceleration? Any cutouts or anything?

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No cut outs nothing. Just slow. Tune is a thought but the t25 didn't boost all the way(7psi) now the 16g hits 2 and probability of them being bad I doubt. So whatever is happening, I think, is happening using both. But did your brothers boost past 2 pounds though.

 

[RadDsm]

A "tune" isn't going to help him at all.

OP- check for pre-turbine exhaust leaks, and check your wastegate. Make sure the the actuator arm is attached to the flapper, and that it seals properly.

Does the wategate have an adjustable actuator arm?

 

[dsmgsx98]

If its not a boost leak, then its got something to do with the waste gate! Do you have a stock boost controler hooked up!

 

[my dreamt dsm]

Will if you don't have a boost controller you should check the wastegate of the 16g. My buddy just did a swap from t small to 16g. All is fine for him. Boost is at 7 though. Not sure if that is normal. Kinda dumb but I forgot the wastegate pressure for the 16g. I know the t small is rated at 10 psi.

Make sure you don't have the pressure and wastegate lines switched around! Reason I stated that is because when I forgot which way the hoses go for my boost controller I only got 2psi max. I switched it then wa la. It boost normal again.

 

[razrman8]

A "tune" isn't going to help him at all.

OP- check for pre-turbine exhaust leaks, and check your wastegate. Make sure the the actuator arm is attached to the flapper, and that it seals properly.

Does the wategate have an adjustable actuator arm?

I checked for pre-turbine cracks and such before I put it on. I thoroughly checked manifold.thinking it may have been a contributing factor. I read about the actuator ARM before I posted. It checks out. And no, no adjustable arm on actuator arm.

 

[LiquidX]

You need to fix your leaks. Pressure test to 20 psi and use a spray bottle of soapy water to look for bubbles. Do you feel any exhaust blowing past the manifold gasket or turbo-to-manifold gasket? Do you see any exhaust soot pre turbo?

 

[razrman8]

If its not a boost leak, then its got something to do with the waste gate! Do you have a stock boost controler hooked up!

Yes stock boost control. Are you referring to the solenoid ? I swapped those out. Not to say it ain't bad too.

 

[dsmgsx98]

I would check the wastegate flapper door! Try taking the arm off the flapper door and see if it will close all the way!

 

[razrman8]

Will if you don't have a boost controller you should check the wastegate of the 16g. My buddy just did a swap from t small to 16g. All is fine for him. Boost is at 7 though. Not sure if that is normal. Kinda dumb but I forgot the wastegate pressure for the 16g. I know the t small is rated at 10 psi.

Make sure you don't have the pressure and wastegate lines switched around! Reason I stated that is because when I forgot which way the hoses go for my boost controller I only got 2psi max. I switched it then wa la. It boost normal again.

Well I'm not running a boost controller.

You need to fix your leaks. Pressure test to 20 psi and use a spray bottle of soapy water to look for bubbles. Do you feel any exhaust blowing past the manifold gasket or turbo-to-manifold gasket? Do you see any exhaust soot pre turbo?

Okay. No. I am Not feeling any exhaust blowing through. Nor do I see.

I would check the wastegate flapper door! Try taking the arm off the flapper door and see if it will close all the way!

I checked the wastegate flapped when I had it off because the o2 housing was off. I didn't take the arm off because it seemed as if there is no problem closing. And its stiff way stiffer than t25

 

[Batty200]

I would check your BOV. I have swapped on new BOV's that would not hold any boost. Once I had a Greddy Type S not hold anything above 5psi.

Good Luck.

 

[razrman8]

Well, after sitting back for AWHILE... I think I have come to something. There are only a couple things that can control how much boost I am getting. Exhaust and wasteagte. And theres only a cople things that control me not getting boost generally: exhaust leak, boost leak, open wastegate. Boost and exhaust leak check out. Which only leads me to a wastegate problem. My t-25 and my EvoIII16g BOTH werent boosting like they should have. So I doubt both are bad. Both being internally wastegated, the only thing controlling a wastegate would be my stock boost control solenoid. I swapped boost control solenoids and I am still having boosting problems. Which makes me think that someway that boost control solenoid is getting a bad signal possibly and allowing my wastgate to be open instead of closed, thus me not being able to boost any higher than I am. So I am thinking that if I ran a manual boost controller and completely bypassed my boost control solenoid, I might not have a problem. Does this make any sense?

 

[LiquidX]

No, a bad BCS wouldn't cause this issue u less there was a major hole in it. The wastegate is just a spring and a diaphragm, very simple. You WILL make the minimum spring pressure until the actuator will push the rod to open the wastegate.

You either have more boost leaks (retest like how I described and fix all of your leaks), a pre turbo exhaust leak and lastly an open wastegate.

 

[razrman8]

No, a bad BCS wouldn't cause this issue u less there was a major hole in it. The wastegate is just a spring and a diaphragm, very simple. You WILL make the minimum spring pressure until the actuator will push the rod to open the wastegate.

You either have more boost leaks (retest like how I described and fix all of your leaks), a pre turbo exhaust leak and lastly an open wastegate.

What exaactly will a bad BCS do then. It controls boost somehow correct? Theres no way that 2 of the turbos I have had on there BOTH have open wastegates. I just could not see it.

Stranger things have happened..

 

[1990AWD]

try plumbing your wastegate straight to a good boost source (bypassing the bcs). with it being a new turbo, I can't see it being a wastegate problem.

are you throwing any CELs?

 

[LiquidX]

The BCS is just a solenoid. An electric signal reaches it and tells it to open a valve, that's it. Open and close. If it was stuck open then boost would be limited to your wastegate spring pressure. It it was stuck closed (IIRC the outlet on the solenoid goes to the actuator nipple) no pressurized air would reach the actuator to open the wastegate causing infinite boost.

I doubt you have a stuck flapper on a new turbo so that leave preturbo exhaust leaks and aging, boost leaks you didn't find. Even a leak at the TB like you said you have will cause issues. You need to fix you leaks before you do any thing else to be honest.

I could barely build 10psi with my HX40 due to a leak.

 

[dsmgsx98]

If the rod on the waste gate is to long, then it would keep the flapper door open and not allowing the door to seal all the way please check this it has happened to me before!

 

[razrman8]

The BCS is just a solenoid. An electric signal reaches it and tells it to open a valve, that's it. Open and close. If it was stuck open then boost would be limited to your wastegate spring pressure. It it was stuck closed (IIRC the outlet on the solenoid goes to the actuator nipple) no pressurized air would reach the actuator to open the wastegate causing infinite boost.

I doubt you have a stuck flapper on a new turbo so that leave preturbo exhaust leaks and aging, boost leaks you didn't find. Even a leak at the TB like you said you have will cause issues. You need to fix you leaks before you do any thing else to be honest.

I could barely build 10psi with my HX40 due to a leak.

I see what your saying now.

Here is another thing this is how my BCS lines are going.
**Bottom nipple of the BCS has a line that runs to my J-Pipe and that line is T'd off and the line coming off the T goes to my wastegate.
**Top nipple's hose goes to the intake
Does this sound correct

If the rod on the waste gate is to long, then it would keep the flapper door open and not allowing the door to seal all the way please check this it has happened to me before!

It was sealing when I had the turbo off and was staring down at the flapper because the 02 housing was off. And I'm having the same problems with both turbo's. The t-25 started doing it and now the 16g is. I doubted the t-25 was good. But when I put the 16g on, It confirmed that I wasn't having a mechanical problem with the turbo or wastegate

 

[LiquidX]

You can just run a hose straight from the j-pipe to the actuator.

 

[razrman8]

You can just run a hose straight from the j-pipe to the actuator.

And nothing to the BCS

 

[LiquidX]

Correct, the BCS acts very similar to an electronic boost controller. It's based off the ecu for it's operation and will slightly raise and lower the amount of pressure the turbo can build by either opening or closing the wastegate sooner or later.

Keep the BCS plugged in as it will throw a CEL when unplugged IIRC. No need to cap off the nipples on it either.

 

[razrman8]

Ahh I see. Okay then. Answer me this sir. Will you EVER have a completely tight system. I mean, if you pressurize the system, the air bleeds air off correct? Where does the pressure go? Where is it venting at. It has to vent somewhere if it bleeds off. Then how would you, for lack of a better term, judge a good system. By the amount of time it takes to bleed off.?

 

[LiquidX]

Basically yes. You should be able to hold pressed for a significant amount of time depending on how good of a seal your internals hold. The optimum way to test is to have both intake and exhaust valves closed.

 

[Zac692069]

Ahh I see. Okay then. Answer me this sir. Will you EVER have a completely tight system. I mean, if you pressurize the system, the air bleeds air off correct? Where does the pressure go? Where is it venting at. It has to vent somewhere if it bleeds off. Then how would you, for lack of a better term, judge a good system. By the amount of time it takes to bleed off.?

yes it would be by the amount of time it takes for the system tested. Its very similar to an air compressor and air lines.

I dont know that you will ever have a "completely tight system".

If everything on the outside of the motor is sealed and not leaking, intercooler, all piping, throttle body etc. then it is a possibility that there is a problem with piston rings and you may want to do a compression test just to be sure.

Thats just my 2cents

Basically yes. You should be able to hold pressed for a significant amount of time depending on how good of a seal your internals hold. The optimum way to test is to have both intake and exhaust valves closed.

What he said