03 GTI 1.8t
Mods: Cold air intake, 3” down pipe & 3” back, Stage 2 tune, 4 bar fpr, and some Dv that came on the car
Alright guys so I finally found someone with a scan tool to diag my 115 blocks.. It’s a stage 2 (2step & NLS) my problem is that I’m not peaking over 15lbs when the tune calls for 22lbs peak. I bought the car with the tune already on it so I was skeptical if it was actually true or not. Today I did a couple pull with the tool hooked up and the MAX Specified boost was 2550 mbar (22.xx lbs) and the MAX actual boost I achieved was 2070mbar (15.3x lbs). So where would I start trying to find a boost leak ? Is there a way to troubleshoot the DV ? And a proper way to test N75 valve (can’t find a true step by step without having questions on a old thread)? What could cause this much of a boost loss ? Any and all help is appreciated. Thanks !!
What fuel are you running. When I got my stage 1 unitronic tune I wanted a stage 1+ but I couldn't because it needed higher octane fuel. They wanted me to run an octane booster every tank. Your car may be tuned to run higher octane. Call the company that tuned your car and see what their stage 2 requires.
It wouldnt cause it to not make peak. But it will cause idle issues. Thats a really common failure point. They tend to sludge up and will get melted through. I got the pcv refresh kit for mine on ebay for dirt cheap. And it was good quality for the price. Cant beat it for under $20.
And I know I must sound like a broken record at this point but you will 100% have a leak at the intercooler charge pipe. Its this bad boy here https://forums.vwvortex.com/showthre...-to-use-sealer They never hold up to mapped boost levels. What will happen is air escapes around the oring causing symptoms just like you have. They where never designed for these boost levels. So when you come onto boost the seam will literally start to lift off. Creating a horrendious leak. And it will settle back down in the housing when you come off. If you have isses with part throttle that appears to clear up once you floor it than its definently this pipe.Alot of time itll cause surge as well. The fix is easy you just need an autozone coupler and some clamps. I personally hated all the factory piping so I went with an ebay intercooler kit to get rid of all of it. You might have other leaks but I gaurentee this is one leak source.
Thanks for the reply man ! Could you possibly send me a couple links of the easy diy on the charge pipe ? This is my first turbo car so I’m learning as I go with all these things. I’m also ordering an entire pcv hose kit just for peace of mind
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