Quote:
Originally posted by 94tegRS
what is the blue box you are talking about. the FMU I wanmna get is blue, thats not it though right? is it another sort of FMU that plugs into the ECU?
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You're probably talking about a Vortech FMU. That's just a rising rate FMU that hold fuel back into the fuel rail under boost. The more boost, the more fuel it holds back on the vacuum operated rubber diaphragm.
The blue box I'm referring to is a electronic FMU that comes with all Greddy 15G kits. The old kit used to have a black box. These splice into the ECU harness and provide more fuel by adjusting the fuel maps. It also keeps the ECU from going into limp mode by hiding boost from the map sensor.
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