hodge Posted February 21, 2009 Share Posted February 21, 2009 (edited) Just abit unsure about the wiring to connect them together really. The AEM UEGO manual sais:- White wire - 0-5v output (connect to any auxilary unit that accepts 0-5v input). Blue wire - connect to an RS-232 serial port for hyper terminal data logging. greddy AFR harness manual sais :- White wire - A/F Gauge Anolog (+) output Gray wire - A/F gauge anolog (-) output. Could someone please point me in the right direction Many thanks John Edited February 21, 2009 by hodge (see edit history) Quote Link to comment Share on other sites More sharing options...
hodge Posted February 22, 2009 Author Share Posted February 22, 2009 Anyone. Quote Link to comment Share on other sites More sharing options...
MA70 Posted February 23, 2009 Share Posted February 23, 2009 If you are just fitting the UEGO guage as a visual indication of the A/F ratio, you can leave both the white and blue wires disconnected. Make sure they cannot short to anything. The blue wire of the AEM UEGO Gauge is for connection to a computer. You can capture and record the A/F values for analysis, adjustment, interest or just because you can. Probably not very useful unless you are adjusting / re-mapping the vehicles fueling. I have a connector on mine that I can connect to a lap-top. The white wire is an analouge output that indicates the vehicles A/F ratio, in real time. The scaleing is be given in a table in the manual. This signal could be used for many things, including direct connection to an engine management system to provide closed loop control of the amount of fuel being delivered by the injectors. From the title of your post I assume this is what you are trying to do. The AEM UEGO Gauge outputs both signals as a voltage measured between the signal wire and the black wire (0V, Chassis , Ground, or whatever you chose to call it) From the information you have given on the greddy harness, it expects a A/F ratio signal that is differential. That is the A/F ratio signal is the voltage measured between the white wire and the grey wire. It does not measure it between a signal wire and ground. This type of system is generally used to eliminate noise that is present in the ground system. It may be possible to connect the grey wire to the vehicle 0V, as close to the 0V of the gauge as you can get it, but I would not recommend it for something as sensitive as the fueling of your engine. Without knowing the full data on the what the greddy harness is connected to, I would say the two are not directly compatable. You will probably need advise from someone who has fitted one, or direct from the manufacturer. Quote Link to comment Share on other sites More sharing options...
Tricky-Ricky Posted February 23, 2009 Share Posted February 23, 2009 I cant tell you anything about the UEGO outputs as i use an Innovate, but the EMU AF input can take a variety of wideband inputs, and is completely configurable to suite. It can generate an auto tune of the AFR outputs and trim the fuelling map if set correctly, however i would only be inclined to use this function as a rough setup, and do the rest of the fine tuning using a reliable logging system. A few people swear by the EMU logs, but as i said i use and trust the Innovate setup for my logging. Quote Link to comment Share on other sites More sharing options...
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