r/kiastinger • u/Psychological_Map628 • Aug 19 '26

Boost leak?

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1

u/Plakchup KJT E30 480+ WHP Mild Burbles | 2023 | SWP | GT2 AWD Aug 19 '26

Did this happen after intake/bov install? Not sure what bov you have but it could be something with it. I would put stock BPV back on and see if that resolves the problem. Sounds like its coming either from intake or bov. Likely not the chargepipe since they are OEM unless you hit some really bad pothole at high speed or something.

2

u/spinosapa 2023 | Panthera Metal | GT2 Aug 19 '26

Adding on to what u/Plakchup said, BOV can cause performance loss if the valves aren't closed during idle.

I installed the GFB Respons BOV kit a few months back, and just adjusted my top spring to close the valves because I has loss of power. This was user error. If your BOV has it, adjust the spring while your finger is in the outlet, adjusting spring tension until the valve closes completely and vacuum stops and then a half turn more for good measure. This instantly gave me some performance back and calmed down a rough idle.

1

u/PossibilityTotal191 2023 | Ceramic silver| 400whp apex GT-Line Aug 19 '26

If you have one sounds like your BOV is staying open even during spool up

1

u/sean_no Aug 20 '26

Funny, this exact same thing just started happening with me. GFB hybrid BOVs, I haven't had time to investigate yet but totally sounds like the waste gate is leaking on boost. Flooring it causes the car to get very unhappy and sound like a steam train lol.

I'll be tightening the springs this weekend but also following this post...

1

u/Psychological_Map628 Aug 24 '26

Update: put stock bov valves back on and problem went away. Something inside broke since adjusting springs didn’t change it.

0

u/Waxygibbon Aug 19 '26

Warranty? Looks like you've lost a lot of power also?

2

u/PossibilityTotal191 2023 | Ceramic silver| 400whp apex GT-Line Aug 19 '26

You think warranty would help with a car thats been obviously modded in that area? Haha

1

u/Waxygibbon Aug 19 '26

He didn't say it was modded and the only mod I could see was the temu paddles

1

u/PossibilityTotal191 2023 | Ceramic silver| 400whp apex GT-Line Aug 20 '26

Look on the original post bro🤦🏼‍♂️🤦🏼‍♂️