Please help!!

[gr33n]

The thing is.... I cant get past 11 psi, i have tried to use 3 different boost controllers... and i have it connected correctly.

When i hit the gas, my boost rises to 11psi no problem, but in about 4000-4500rpm it starts to creep, and it will creep up as long as im on the gas (past 25psi)

My setup

Big evoIII 16G
evoIII manifold and o2 housing
FMIC
3" GM maf
greddy type RS bov
Walbro 255
rre 580cc injectors
Apexi super AFCII
Greddy Type S BC

and more stuff.....

can anyone here please tell me what might be wrong ;/

 

[TwoLiterLaser]

What exhaust you running? Got any boost leaks? At what RPM are you making the 11 psi?

 

[gr33n]

What exhaust you running? Got any boost leaks? At what RPM are you making the 11 psi?

2,5" downpipe, 3" the rest. No boost leaks, and i hit the 11psi @ about 2500-3200 rpm

and yeah... of course.... I have the GM maf nect to the TB

 

[dnhieu]

Sounds like a bad boost creep issue to me. try getting a o2 dump o2 housing, or getting a bigger wastegate.

 

[underradar92]

Disconnect your actuator arm & see if you build any boost. Mine will only see about 5psi in that state, & I have no creep at all with it connected. If you see more than that, http://dsmtuners.com/forums/showthread.php?t=217409&highlight=oldman+porting read this.

 

[gr33n]

Disconnect your actuator arm & see if you build any boost. Mine will only see about 5psi in that state, & I have no creep at all with it connected. If you see more than that, http://dsmtuners.com/forums/showthread.php?t=217409&highlight=oldman+porting read this.

but the thing is... shouldn't i be able to change the boost settings higher, even though it would creep. as in no matter what I set the boost controller in it doesnt change a thing, I have tried my Greddy type S, SBR mbc, joeP mbc and my home made

 

[gr33n]

Sounds like a bad boost creep issue to me. try getting a o2 dump o2 housing, or getting a bigger wastegate.

then I would have to change out my 2 year old EvoIII 16G

 

[oldman]

I know you've already said it's hooked up correctly, can you explain how it's hooked up? As detail as you possibly can.

 

[gr33n]

I know you've already said it's hooked up correctly, can you explain how it's hooked up? As detail as you possibly can.

ok... to the main system in the car. It has 2 wires that go to 12V, and ground. And it has a vacuum/boost hose running to the engine compartment, connecting to the vacuum/boost hose that the fuel regulator gets his vacuum (the boost gauge is also connected there) I have tryed to set it on each side of the FPR solenoid but that doesnt change a bit, so I have it now @ the FPr side of the solenoid.

OK... then 2 wires run from the controller it self to the "relay" that is in the engine compartment, those ar just hooked together no way I could screw that up

So the relay gets it boost source from the same sourse the BOV gets his source just connected togeter with a T pease (just like I had it with my old system)
And from the relay it goes straight to the actuator.
The relay has 2 inlets/outlets on it, Com and No... i have that connected correctly incording the greddy manual.

Hope that helps

 

[GSTdude06]

The wastegate is bad..... I had that same problem on my 14b, switched wastegates and it holds boost perfectly.

 

[gr33n]

Ok... i just bought a ss tubular manifold and tial 38mm wastegate from slowboy.... but i have en internal wastegate in the 16G.... is it enaugh just to unplug the actuator (vacuum/boost hose) or do I need to weld the flapper stuck?

 

[GSTdude06]

u have to weld it shut or it will just flap open in wastegate be non-working

 

[gr33n]

u have to weld it shut or it will just flap open in wastegate be non-working

not if the actuator is still attached to it... just not the vacuum hose it self... couse I mean, it needs the boost to open. I searched some answers on this forum, and that is what I read.

 

[GVR4592]

If you are going with an external on the manifold the flapper needs to be welded. It will blow open regardless of the actuator being there. What vehicle is this on?

 

[GSTdude06]

Told you

 

[GVR4592]

What are you 12?

 

[GSTdude06]

how you know?

 

[gr33n]

If you are going with an external on the manifold the flapper needs to be welded. It will blow open regardless of the actuator being there. What vehicle is this on?

It's for a 90 GSX