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Author Topic: BOV- Bad for car?  (Read 352 times)

Offline B25SDJ

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BOV- Bad for car?
« on: February 06, 2026, 12:41:57 pm »
Ive been told that its not worth getting a blow of valve and i should just keep the recirc? whats the verdict? i want some nice noise from it. does it damage the car.

Offline GVK

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Re: BOV- Bad for car?
« Reply #1 on: February 06, 2026, 05:28:38 pm »
Because the car runs a MAF sensor based fuelling system, any unmetered air from an atmospheric BOV will upset the fuelling, could cause lumpy running and stalling.

Offline ZoliWorks

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Re: BOV- Bad for car?
« Reply #2 on: Today at 01:02:02 pm »
If you want some noise from it, stick an aftermarket intake, k04 dv relocation kit, a rev G dv and get it mapped. If mapped, you can use a DV+ if k03, rev G if k04. DV+ cant really deal with the pressure a K04 works with and will throw CEL

Also noise depends on the pressure the map demands of it.

First video was recorded with a k04 with a dv+ and 1.55 bar peak pressure. 2nd video is 1.45 bar peak and a rev G. The noise is still there just not as continuous. I have to be under WOT for it to happen. Also this was recorded when my downpipe-muffler buckle came apart so i was basically running a catless straight pipe



Mk5 Jetta 2.0 TFSI BWA | Manual | Mk6 GTI Front | BorgWarner K04 Turbo | Sachs X-Tend Clutch Kit | Ta-Technix Air Intake | Ta-Technix Cat-less Downpipe | Ta-Technix Sandwich Intercooler | OEM S3 Injectors | Vis Motorsport 175 bar HPFP | 319hp 491nm