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Title: Boost control Post by: turdburglar44 on July 29, 2014, 08:43:16 AM After logging my car I'm seeing 95% wgdc 24/7 but am only getting 8psi. Now first of all I have no idea why I'm seeing higher than max wgdc but first things first why am I not hitting target boost?
Did a brief boost leak test by spraying joints with carb cleaner listening for idle fluctuations. Everything is good. Fuel trims agree. Made sure the n75's solenoid engages by using a 9v battery. Could the solenoid work but the valve not seal properly? Is the line to the waste gate actuator supposed to have a restrictor pill? My only other thought is the dv may be leaking. That's my next test. Any input? Title: Re: Boost control Post by: nyet on July 29, 2014, 09:23:01 AM You're on the right track, but the 9v test of your n75 doesn't tell you anything unless you pressurize the legs and see if the valve holds, like you said.
Title: Re: Post by: turdburglar44 on July 29, 2014, 09:35:53 AM Awesome. That's exactly what I needed to hear. I have a grimmspeed boost control solenoid off my old wrx. Would I be able to cut the connectors and splice the wires or would that cause other issues? I guess its time to pull the nitro tank off the work truck and do a real leak test.
Title: Re: Post by: turdburglar44 on July 29, 2014, 10:25:04 AM 4) KFLDIMX does not cap N75 DC. It is the base for the upper and lower I limits.
Found the answer to my wgdc being sky high. Amazing what happens when you read. Title: Re: Post by: nyet on July 29, 2014, 10:28:08 AM Awesome. That's exactly what I needed to hear. I have a grimmspeed boost control solenoid off my old wrx. Would I be able to cut the connectors and splice the wires or would that cause other issues? I guess its time to pull the nitro tank off the work truck and do a real leak test. just get a real N75 :) btw by pressurize, i mean, you can put your fingers capping the two outlet legs (to vac, to wg), blow into the pressure leg (to manifold), use the 95, and make sure all the pressure goes to the wg and not to vac. but really, just replace it and call it a day. Title: Re: Re: Boost control Post by: turdburglar44 on July 30, 2014, 06:35:17 AM Just found this. Answered my question about the restrictor pill. Thought I'd share. (http://dave-new.com/S4/N75_valve/N75-2.jpg)
Title: Re: Post by: turdburglar44 on July 30, 2014, 04:46:22 PM Wow never mind. Previous owner had the egr plugged into the n249 and the dv plugged into the n112.
Best mod yet: swap vacuum lines +80hp Title: Re: Boost control Post by: nyet on July 30, 2014, 05:33:48 PM ;D
Glad you got it sorted! Title: Re: Boost control Post by: turdburglar44 on July 30, 2014, 09:18:06 PM and now I think it's obvious that the n75 is leaking too haha. High Fuel trim right once the waste gate opens.
Is Lambda control total fuel trim? I know with torque on my phone I can actually see short term and long term fuel trims. Title: Re: Post by: turdburglar44 on July 31, 2014, 11:28:04 AM Could secondary air be leaking? Positive fuel trim could only mean vacuum leak or air in the exhaust somehow...
Could someone clarify with me how I can check/log fuel trims? Title: Re: Boost control Post by: nyet on July 31, 2014, 12:46:22 PM VCDS 32 and 33
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