# Back pressure sensor

**URL:** <https://community.ecumaster.com/t/back-pressure-sensor/3983>\
**Category:** EMU BLACK / CLASSIC\
**Created:** [July 3, 2025, 6:02pm UTC](https://community.ecumaster.com/t/back-pressure-sensor/3983 "2025-07-03T18:02:28Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![Gunner](https://avatars.discourse-cdn.com/v4/letter/g/258eb7/32.png) [@Gunner](https://community.ecumaster.com/u/Gunner)\
**Post date:** [July 3, 2025, 6:02pm UTC](https://community.ecumaster.com/t/back-pressure-sensor/3983/1 "2025-07-03T18:02:28Z")

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I have a 1.8t EMU black PnP ECU and want to add an electronic wastegate to my new turbo setup.

TLDR: Do you have to have a back pressure or EMAP/EMP sensor to run an electronic wastegate?

More details: I’m going to use an external Hbridge/controller that says it will accept a PWM signal from any ecu and output it to the EWG. However it says it needs a 1kHz signal. In EMU black the frequency can only be set between 5 and 400, unless you set the solenoid output to “electronic wastegate”

Then under EWG parameters, you can choose from 1kHz-2kHz frequencies. but now i’m not sure if its going to be basing its duty cycle off the DC ref table like a normal mac valve would accept, or the EWG base DC table, which shows the Y axis as Back Pressure.