JustinOlson Posted January 28, 2008 Share Posted January 28, 2008 I have a 77 280z with a factory rebuilt motor. I got a free unichip to put on my car. I found the pinout below searching through the forum. I just wanted to make sure this is the correct pinout for my 280z L28. The Unichip Q is basically a piggy back computer. It allows you to retain the factory ECU yet go to larger injectors and pull back the pulse width (You can't really add pulse width. Most applications you go to a larger injector and pull out injector open times to achieve the proper Air Fuel ratio). It can also do timing control, but I'm not sure how much I can do with my distributor. I will be pulling the factory mass air flow sensor and going to a MAF out of a Subaru impreza (have one lying around so its free to me). Also, I have to add a air temp sensor. I'm going to use my Innovate LC1 to tune it http://www.unichip.us/unichip_features.asp Here's the pinout/color/purpose in a 280z. 1/B/Coil (actually goes to the 4-pin connector, more on that later) 2/B/TPS #2 3/B/TPS #3 4/G/Start signal to stock ECU not used in Megasquirt 5/B/ Ground 6/B/ AFM #6 7/B/AFM potentiometer 8/B/AFM 9/B/AFM 10/L/Switched 12VDC from ignition relay...more on this cluster later 11/not used 12/B/to altitude switch-not used in megasquirt 13/B/H20 temperature sensor signal...2500 ohms at 80 deg F 14/B/Injector #4 switching pulse 15/B/Injector #1 16/L/GROUND..has a bit of yellow paint on the end 17/L/GROUND..has a bit of WHITE paint on the end 18/B/TPS middle wire (I put this to ground on MS-II) 19-not used 20-not used 21-G/Cold start injector 12VDC comes from 4-pin connector Can be reutilized as in my install 22-not used 23 thru 26 also not used 27/B/AFM 28 and 29 not used 30/B/Injector #5 31/B/Injector #6 32/B/Injector #3 33/B/Injector #2 34/G/Air regulator 12VDC lead I reutilized this (without the 12VDC naturally) 35/L/ GROUND..has a red mark on the end by the "DB-35"(datsun-bullcrap 35pin) connector Quote Link to comment Share on other sites More sharing options...
1 fast z Posted January 28, 2008 Share Posted January 28, 2008 The stock ecu has NO timing controll, its all an independent system. Quote Link to comment Share on other sites More sharing options...
JustinOlson Posted January 28, 2008 Author Share Posted January 28, 2008 The stock ecu has NO timing controll, its all an independent system. Mmm, I see. Maybe I'll be able to control the Auxilary Timing control unit as well. I really don't know much about the Unichip or the L28 ECU honestly. My cousin used to be the head engineer/developer over at unichip so he's going to step me through this. Justin Quote Link to comment Share on other sites More sharing options...
JustinOlson Posted January 28, 2008 Author Share Posted January 28, 2008 The stock ecu has NO timing controll, its all an independent system. Mmm, I see. Maybe I'll be able to control the Auxilary Timing control unit as well. I really don't know much about the Unichip or the L28 ECU honestly. I have a friend that is very good with them that is going to help me go through the install and tune. Is there a pinout for the timing control unit? Justin Quote Link to comment Share on other sites More sharing options...
1 fast z Posted January 28, 2008 Share Posted January 28, 2008 Well in those years it is a transister style ignition, the box is under the dash, on the passenger foot compartment area. So can you interface with this unichip with a laptop? Quote Link to comment Share on other sites More sharing options...
1 fast z Posted January 28, 2008 Share Posted January 28, 2008 Sounds to me, that it works much like a SAFC, is this correct? Quote Link to comment Share on other sites More sharing options...
JustinOlson Posted January 28, 2008 Author Share Posted January 28, 2008 Yeah, you can even do a PDA interface I believe. Its a lot like a SAFC I guess. It just is pretty advanced and has lots of control. Justin Quote Link to comment Share on other sites More sharing options...
Mack Posted January 30, 2008 Share Posted January 30, 2008 save yourself a headache and just megasquirt yor car. Quote Link to comment Share on other sites More sharing options...
WizardBlack Posted January 31, 2008 Share Posted January 31, 2008 agreed. I have run across Unichips before. I will say that I'm not surprised you got one for free. Quote Link to comment Share on other sites More sharing options...
JustinOlson Posted January 31, 2008 Author Share Posted January 31, 2008 Theres nothing wrong with them. They do what they were designed to do. I'll get it wired up and post back with results. Regards, Justin Quote Link to comment Share on other sites More sharing options...
Dane Posted January 31, 2008 Share Posted January 31, 2008 If I'm not mistaken, the 280Z electronic distributor still used mechanical and vacuum advance...so to do any sort of tuning of the ignition timing curve would require adjustments in centrifugal weights, spring rates, etc. If you kept that distributor that is. If you could somehow use this Unichip to delay the spark response from the transistor unit...you could advance the distributor mechanically and then retard timing with the unichip to get the correct timing curve. Of course, if it didn't retard timing you would be too advanced. Please take what I just said with a grain of salt...as I've just been thinking about that while reading your post. Quote Link to comment Share on other sites More sharing options...
JustinOlson Posted January 31, 2008 Author Share Posted January 31, 2008 At this point I'm not too concerned with the ignition side of things. I'd just like to get the fueling dialed in better. Justin Quote Link to comment Share on other sites More sharing options...
olie05 Posted January 31, 2008 Share Posted January 31, 2008 another shameless plug for megasquirt... for the same amount of headache in wiring you could have a full standalone AND get rid of the AFM. Quote Link to comment Share on other sites More sharing options...
ShrekC Posted January 19, 2022 Share Posted January 19, 2022 I know this is an old thread but how have opinions for https://www.unichipeurope.com/ changed throughout the years? Quote Link to comment Share on other sites More sharing options...
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