richard p Posted August 2, 2007 Report Share Posted August 2, 2007 Hello, I have recently purchaced a VLLink plug and play ecu. The tune that is currently on the ecu is very similar to my setup at the moment so i have no doubt it will run with the ecu installed. Basically stock feul system with a few bolt on mods. For installation of the map sensor i have to plug in 3 wires into the AFM loom. The colours of the wires on the map sensor are as follows 1 - Black 2 - Red 3 - White I can asume the that black is ground and the red is positive. The white wire would then be for signal. Am i safe in saying this? There are connections on the afm loom and they are as follows. 1 - 26 - Air temp sensor 2 - 36 - Body ground 3 - 31 - Output signal 4 - 12 - Air wire self cleaning 5 - Battery power (from EFI relay) 6 - 30 - Mixture screw From my research there are only 3 wires that make it back to the stock ecu that relate to the afm. From this link here http://wiki.r31skylineclub.com/images/c/c9/Pinouts_R31-RB20and30.gif looks like pin 2, 6 and 3 are the only wires used directly for the afm. Well it looks like ive answered my own question Well, just making sure. Need a bit of confirmation that on the map sensor black is ground and would goto pin 2, red would goto 5 and white to pin 3. Thanks in advanced for any input Quote Link to comment Share on other sites More sharing options...
ashesman Posted August 2, 2007 Report Share Posted August 2, 2007 Check here for the VLLink manual, it has a picture in it of how to wire the MAP sensor... Quote Link to comment Share on other sites More sharing options...
richard p Posted August 7, 2007 Author Report Share Posted August 7, 2007 thanks for that, didnt notice that there. I have installed the ecu and it runs fine. just in need of a tune now I have another question regarding the map sensor. Say i have a 1bar map sensor (i possibly do). Does this mean that any value +or- 1bar from 0 vaccume is picked up by the sensor. One bar is roughly 14psi. The car idles at -20psi does this mean that anything inbetween -20 and -14psi does not get registered..... or could it even mean half a bar each way gets registered. -7psi to +7psi. This really makes a difference in time and price for me and im keen to find out. Quote Link to comment Share on other sites More sharing options...
ashesman Posted August 7, 2007 Report Share Posted August 7, 2007 MAP sensors are rated in absolute pressure. Say you have a 2.5 bar map sensor, then it can measure 2.5 bar absolute. A complete vacuum is 0 bar, atmospheric pressure is about 1 bar at sea level, so 2 bar absolute is 1 bar above atmospheric pressure (or about 14.7 psi of boost). Therefore a 2.5 bar sensor can measure anything from a complete vacuum to 1.5 bar above atmospheric pressure (about 22psi boost). Your VLLink will not have a 1 bar sensor, more likely a 2.5 bar or 3 bar sensor. They are almost always shipped with a 2.5 bar sensor... Quote Link to comment Share on other sites More sharing options...
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