Hello guys,

So I have upgraded some parts on my car and I thought that it would be safe to up the boost on my setup. I have the following:

K03 stock turbo
Milltek Cat-back exhaust
Bailey Motorsport Diverter Valve
GIAC Stage 1
FMIC kit
TestPipe
K&N Filter
Forge Turbo Inlet Hose

I disconnected the wastegate vaccuum line and now I am at 19 lbs (stock wastegate spring tension). I was at 15 psi when I had the GIAC chip and the cat back only. The biggest improvement since before and after is the FMIC. With all my upgrades, would this be ok? I am NOT interested in durability of the turbo since I am planning on upgrading it in the future.

 

Just intalled NGK BKR7E-4644 plugs as well. These are cooler plugs, so should help out with detination, if there is any. I think I'll be buying an air/fuel ratio gauge.

 

Seems your not sure how a N75 valve works. If you disconnect the line to the turbo nothing is being used to open the WG. The WG actuator spring is actually rated at 5psi, so only 5psi of boost pressure is needed to open the WG.

If you bypass the N75 valve and connect the lines directly to the actuator the turbo will only boost to 5psi. This is why when the ECU goes into limp mod the turbo will only push 5psi and that happens because the ECU opens the N75 100% to let the pressure thru.

When you disconnect the line to the WG the k03 should boost to 30+psi and do it in a hurry. Running higher boost on a K03 just produces more low end tq and a smaller power band, doesn't really increase peak hp since the boost is going to taper off no matter what.

 

Alright.. I understand what you mean.. I have left the n75 valve connected.. all I have done is remove the vacuum that goes to the wastegate. This has provided me with 19 psi of boost constantly.. i'm not sure why I dont reach the 30 psi, but for now, I am content with the increased torque

 

That means your WG is cracked open or your turbo is old and worn out.

 

that sounds reasonable.. time to get the extended warranty to give me a new turbo