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Bosch DBW TB 0280750473 problems with small opening angle

EFI Tuning Fundamentals

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Hello,

I'm using a bosch DBW Throttle Body 82mm on my 13b-rew (pn 0280750473)

Because of the large throttle body, I need very small opening angles to achieve a stable idle. To be precise, I need about 1.2% opening angle. However, the throttle body has recently been behaving very imprecisely in this range. In this range, the throttle body can only be driven to either ~1.8% or ~0.6%. Is this a technical limitation of the throttle body, or a tuning problem with the ECU? It's an Ecumaster EMU Pro.

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Bastian

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