Feels like it hits a wall

[GSTdude06]

Just installed greddy piping along with a greddy bov (dont know which type) and its trying to boost over 15 and when it does it feels like its hitting a wall, like no fuel or somthing. Like its dead or something idk anyone got any ideas of whats the problem? Every clamp is the tightest it can be. I have a mbc hooked up I believe its the correct way cept that on the BOV theres 2 nipples, one goes to the intake manifold, the other the mbc? The a line from the wastegate to the side of the mbc?

I cant understand whats going on and I cant come close to flooring it.


Major boost leak?

Fuel Cut?




I have uncontrollable boost.




-Logan



Help is Thanked For Greatly!

 

[GSTdude06]

so unhook the hose to the BOV and plug that hose to the waste gate? is that what you were talking about mybeatgsx?

I ONLY had the tape on there for the boost leak test cause all the air compressed in just would run out there and wouldnt tell me wher any leaks are i dont have it on

Well ive hit speed limit, so I guess im not gettin fuel cut but something is telling my car not to go anymore.....

Settings on the safc is default and the problem is only there at around 35%-100% trottle

 

[GSTdude06]

ok I did everything

intake hose to wastegate......still messed up
switched hoses on wastegate.....still messed up
even put the wgs back on and still messed up

idk what to do.......:/

 

[oldman]

Ok, clean up time.

1. The hole on your mbc is call the wastegate pressure relief valve, all mbc's have it. Its function is to relief pressure between the mbc and actuator so pressure will not get trapped in between shifts causing the wastegate to stay open, this is why the hole is located on the fitting going to the actuator. So in conclusion, the mbc is not defective, at least not from the information given so far.

2. Step 1 in boost leak testing is to disconnect the mbc or turn the knob all the way in to avoid pressure escaping through the bleeder hole. Re-test, fix all leaks, intake tract holding 20psi, then you can rule out boost leak. Post back results.

 

[Justins99GSX]

If you hooked everything back up to the way it supose to be without the MBC I would say you are looking at a bad wastegate or a stuck on at that.... try hookin a line from the wategate to a air gun and blowing a small amount of air to see if the wastegate is working properly....

 

[GSTdude06]

common boost leak locations?

Everywhere is good except around the throttle manifold, thats the only place I havnt LOOKED deeply into but I can only get the gauge to go to 5psi, so its a leak?

 

[oldman]

common boost leak locations?

When doing the test, always assume everything is leaking and work your way up. I suggest moving your tester to the TB elbow first and focus on smaller areas then work your way back to the turbo inlet. Spray soapy water on injector seals, IM gasket, TB shaft, BISS.....as well listen for leaks under the oil cap and tail pipe.

I can only get the gauge to go to 5psi, so its a leak?

Leaks.

 

[GSTdude06]

ok.....I have put it on my turbo and tested for leaks all the way to the TB none on that route


TB and on is difference, I cant hear em so I stopped, I soapy watered it b4 and got the BISS one and I fiexed that...ill soapy water it again tho



Now tail pipe leak? So an exhaust leak would cause this problem to?

 

[oldman]

Not quite sure how you were able to pressure test just between the turbo and TB but the bottom line is 20psi and no less then 30 second before leaks down to zero is the desired final result. If you can't achieve this, you're not looking hard enough. Air leaks out of tail pipe is not an exhaust leak, it's usually caused by a defective egr valve or valve overlap. Forget what you have done so far and just follow the steps I posted, just because there were no leaks at 5psi doesn't mean it's true at higher psi level.

 

[dub2gsx]

When you put your fuel pump on did you change your fuel filter. Check your plugs(correct gapping), and plug wires. The car has never seen that much fuel and now it may have revealed some parts that needed to be replaced soon!!

 

[GSTdude06]

I pressurize at the turbo and checked everything up to the TB, I didnt not check the TB and manifold but I couldnt hear nothing so I assumed as most people do, I listen to you oldman, your wise...



I have already ordered new plugs and wires just waiting on them to come in and I replaed the filter when I installed the pump


Tomorrow or saturday ill soapy water the stuff and check again till I can hold 20psi for 30seconds






Yall all think my problem is just leaks?

 

[oldman]

Yall all think my problem is just leaks?

You won't know until you fix them all, process of elimination.

 

[dub2gsx]

I bet it's the plug wires just had the same problem when I canged my pump and it was the plug wires. Try the cheap stuff and work your way to the more expensive. If anything new parts on maintenance can't hurt anything!

 

[GSTdude06]

Ive had this problem with my regluar pump....


Might be they just are going bad but im still doing everything I can cause I no I have leaks......

 

[oldman]

I don't get it, how can you say "I know I have no leaks" when you can only pressurize the intake up to 5psi? That's like saying the cup won't hold water but I know there are no leaks. Good luck.

 

[GSTdude06]

i said I NO I HAVE LEAKS if u read my last post......

 

[oldman]

Nevermind, I mis-understood your last post, use proper grammar damn it.

 

[GSTdude06]

haha oo my bad, ill get that leak test done as soon as I can.

Thanks for the help.

 

[GSTdude06]

I did the boost leak test.... hooked it up to the TB and found only the BISS screw did it with soapy water to, I just changed that o ring to, I dont understand how it could be leaking.


I dont understand where the leaks can be coming from!!


I DO have a check engine light for my EGR valve low output........would that cause a leak?
Open when needs to be Closed....Closed when needs to be Open...that could be the problem?


I need HELP AHHHHH!!!

 

[oldman]

I did the boost leak test.... hooked it up to the TB and found only the BISS screw did it with soapy water to, I just changed that o ring to, I dont understand how it could be leaking.

1. If your mbc is tapped to the bov line, disconnect the mbc. It's best that you tap the compressor/j-pipe for the mbc.

2. Where did you spray soapy water?

3. How much psi did the boost gauge register during the test?

4. Did you open the oil cap and listen for leaks?

5. Are you using a compressor or bike pump?

I DO have a check engine light for my EGR valve low output........would that cause a leak?

If the EGR is stuck open under boost, pressure will leak right out of the exhaust, have a friend listen for leaks at the tailpipe during your next test.

 

[GSTdude06]

14b on a 2g doesnt have a compressor nipple nor the install kit j pipe have one, I have to hook it there......

Soapy water everywhere......gaskets, holes, injectors, lines......

it held like 5psi for like 10 seconds maybe

and a compressor.....




ill get someone to listen at the tail pipe next time, ill try again tomorrow


im always getting a sheet metal intake so my egr wont be there at all and all my gaskets will be replaced so if I cant find the leak I hope that should.

 

[oldman]

I'm not there to see the car but I can tell you this much, testing from the TB elbow and only able to hold 5psi indicates decent size leaks. Make sure you have high concentration soapy water, they must be sprayed to bubble up. Also just because you see no bubble at 5psi doesn't mean there won't be at 10, 15 or 20 psi, the leaks are there and it's up to you to find them. Don't forget to open the oil cap and listen for leaks.

 

[GSTdude06]

Im doing everything I can to find them trust me, because of this im losing my races and thats not a good thing, tomorrow ill try and find some more.....


I JUST fixed the BISS screw one I replaced the O ring on tuesday, stil leaking why? the screw bad?

 

[oldman]

I JUST fixed the BISS screw one I replaced the O ring on tuesday, stil leaking why? the screw bad?

Try a same ID but thicker o-ring, apply dielectric grease on the o-ring to prevent tearing it.

 

[DROOPY209]

if you're only holding 5psi, you have a nice sized boost leak, thats for sure. I can almost bet the farm on it.

how many miles are on your car?

I'm willing to bet you might have some bad vacuum lines if you have a lot of miles on your car.

 

[GSTdude06]

130,000