OverBoosting and Running 2 Rich Please Help

[FinestEclipse]

I got a 96 DSM GST with
1g 14b Turbo
stock internals and a new internal waste gate to see if it would stop over boosting
Greddy Big 24V Front Mount intercooler with Greddy Type S Blow Off Valve, waiting now on the Greddy Pipping Kit
3'' Thermal Exhuast 5" Tip with the down pipe and NO Catalytic
Injen Air Intake
255 Walbro Fuel Pump
ACT 2600 Clutch
B&M Fuel Pressure Regulator
Aerospeed Short Shifter and Grounding Kit
Apex type R Boost Controller with the Nice interior Brezel that takes away the a/c
UNORTHODOX-RACING ULTRA SS Pulley kit
MSD Ignition Wires With NGK Plugs
Innovate Wideband LM-1 Kit
HKS fuel Cut defender
O2 sensor piping open to the grouned not connected to the exhuast

Racing
My car is overboosting to like 17lbs-20^psi
It usually stays at 19lbs-20psi but sometimes passes 20lbs psi.

Its been checked for vaccume holes,exhuast leakes and nothing i dont no what the problem is, it might be the intercooler holds more pressure so i need a external waste gate or something.

Also I put a scanner cause my check engine light is on sometimes and it says something about the injection throttle adjuster.

 

[FinestEclipse]

Please PM also

 

[sweet97]

The 3" exhaust is probably the problem. try a 2.5" downpipe and port the 02 housing.When i bought mu EVO 16g Buschur said to use a 2.5 inch exhaust with that turbo to avoid creep, mark

 

[2-0turbo]

Hi, I'm boost creep, nice to meet you. You need porting my friend. A data point for you. With my fully ported 14b on my 1G, I can go as low as 10-11 PSI all the way to redline with a full 3" system. During turbo problems, I bolted on a stock 16g with no porting whatsoever. With my boost controller backed all the way out, I was boosting 14, 16, and even 18. Whatever it wanted. Porting is the difference.

Do a search on some porting and get yourself some tools. Areas to focus on include the turbine housing and O2 housing. Don't go too crazy on the O2 housing--focus more on the wastegate side. Remember, you want to make it EASIER for exhaust to WANT to flow through the wastegate.