loss of power.


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Audi A4 1.8T
I have 2001 Audi A4 1.8T

I have lost power. I replaced the turbo a few months ago. All was fine after it was fixed, i started to lose power and got a funny farting noise when i came off the throttle about a month ago. So i started to investigate, Found a split hose going to the turbo, Fixed that, changed the diverter valve to a forge splitter valve, which i can adjust, added a boost controller and a boost gauge. but it still feels slow.

The turbo is boosting up to about 1.2 bar. but dosent hold a boost. just shuts off before i come off the throttle.

Can i do away with the n75 valve as i have a boost controller? Would that valve be interfearing with the boost controller.
Last edited:
You shouldn't be using the factory boost controller with the standard one at all, best thing to do is make sure is disconnected pneumaticly and leave it connected electrically to make sure the ecu doesn't through up a fault saying the boost controller isn't there.

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