boosting issue

[Ok3skid1]

Im set up to run 14 pounds of boost on stock turbos. I just replaced the heads,turbos,y-pipe and gutted the cats. I just got the car back yesterday so i have not pushed her hard at all. As i was coming home from the shop and getting on the interstate i gave it some gas and as boost began to build the car just nose dived i guess you could call it. The engine stuttered and acted like it just gave up. My first thought was over boost. My gauge was reading 25 (aftermarket pro-sport) pounds(dont even think 9b's can spike 25 lbs lol). I pulled over immediately and turned the mbc almost all the way down. as i was getting back on the highway i babied her up to speed. in 6th i tried again and same result. this time i heard a loud whistle under the hood. Any ideas... my first thought was a massive boost leak.

Oh i did replace some things this morning as well. i replaced the rear o-ring on the rear turbo pipe and the vac caps that were dry rotted. This killed the whistle but not stalling during boost

And 1 thing i did notice is i can ease into boost a little bit but not full throttle.

Things i have done to car when it went down.
fairly new 9b's from a jdm engine
vac reduction
y-pipe
gutted cats

[J_Parker]

Check your wastegates pressure, do a pressure test on your intake, had you done anything to do with fuel? In the simple mind thoughts I had it sounds a lot like fuel cut?

Also, what year is your car? check into your TPS, and CAS.

[Ok3skid1]

no pressure test yet...

as far as fuel its all stock system. with the boost set at 7 pounds it dont fuel cut as often.

My mechanic that worked on it to get it running said the same thing a fuel cut.

tps and cas rings no bells can you explain a little?

[ikOnone]

tps and cas rings no bells can you explain a little?

throttle position sensor and cam angle sensor.

[CoopKill]

Boost leak classic.

[Ok3skid1]

i turned the boost controller way down. My gauge showed a total of 7 pounds of boost the last time i boosted. Now i cant hold 2 pounds without a bunch of air escaping from some where. It sounds horrible. maybe my blow off valve

[MightyMouse]

Spark Blowout..
Replace coil packs and/or wires or perhaps the PTU..

[CoopKill]

Spark Blowout..
Replace coil packs and/or wires or perhaps the PTU..

WTF, do you even read what is posted?


i turned the boost controller way down. My gauge showed a total of 7 pounds of boost the last time i boosted. Now i cant hold 2 pounds without a bunch of air escaping from some where. It sounds horrible. maybe my blow off valve

[CoopKill]

You need to get a pressure tester and start finding your leaks. From what you are posting it sounds like it's a major leak at a connection point.

[Ok3skid1]

You need to get a pressure tester and start finding your leaks. From what you are posting it sounds like it's a major leak at a connection point.

of course i read it... Why would i ask for help and not read anything

Im in the process of building a pressure tester...

as far as the ptu and coils both were pulled and tested during the process of putting motor back together from head job. They both tested good but i dont know enough so im not saying there not my problem still.

[CoopKill]

was referring to mighty mouse reading, not you. His post has nothing to do with your symptoms. You most likely have a large boost leak, not spark blowout or bad coils/ptu...

[MightyMouse]

WTF, do you even read what is posted?

Oh, HOLY SHIT I didn't even notice his post, I'm pretty sure that's the only post I didn't see somehow.
Anyway, if that's the case I'd start by checking all of the soft pipes first. Perhaps one is blown open.

[CoopKill]

LOL yeah I thought something was up. :suspect: