cbuczesk Posted January 21, 2004 Share Posted January 21, 2004 I'm dropping a 280ZX turbo engine in a 1974 260Z and would like to use the early 300ZX fi system. The engine currently runs well with a 1976 280Z fi system. Have many people done this? Is it documented anywhere? I didn't have any luck searching the archives or web. I noticed that SleeperZ did it. How do you like it? I'd appreciate any help. Anyone have one for sale? Thanks, Chuck Quote Link to comment Share on other sites More sharing options...
SleeperZ Posted January 21, 2004 Share Posted January 21, 2004 I'm very happy with it. Throttle response is excellent, all emissions devices are gone and it still drives like factory. Only minor issue with driveability is at the strip spinning tires before going to the line; it wants to stall when I get off it. I believe a factory dashpot will solve that. There is not a lot of documentation on it. I made a wire list mapping the differences between the 280ZXT pinout and the '86 and '87 ECUs, but this infomation was drawn from a Chiltons manual. I suggest using a harness from a Z31 to avoid some of the signal swapping I had to do. Parts are easy to find - distributor disc from a Z31 bolts into the ZXT distributor ('82, '83), all Z31 MAF sensors are the same. I also would suggest a '84 -'86 as the O2 sensor for the turbos changed in '87, and the old ZXT O2 sensor won't work. If you have specific questions, just ask, but the install will require a bit of research. Quote Link to comment Share on other sites More sharing options...
cbuczesk Posted January 21, 2004 Author Share Posted January 21, 2004 I don't mind doing the research. I've already done a bunch to make sure that the stock 280Z (non-turbo) fi system would work. I'll have to make a list of parts that I'll need. I plan to use a Z31 harness. I have an MSD 6AL so I'm not sure if I'll have to modify the distributor for the Z31 system. Will I? Do you know if the Z31 sensors are direct bolt-ons, should I use the 280Z/ZXT sensors, or ??? I found a guy on zcar.com with a bunch of Z31 fi stuff for sale but he hasn't replied to my email. Do you have any pics of your setup? Chuck Quote Link to comment Share on other sites More sharing options...
Bernardd Posted January 21, 2004 Share Posted January 21, 2004 I've done the swap as well. I used SleeperZ conversion chart and frankly couldn't have done it successfully without it. If you plan on modifying the ecu for larger injectors and tune it for more power, it's much easier to use the later ecu's. The 88's are straightforward and behave in the same manner as other Nissan ecu's, the 86 is also quite easy but the older 84+85 ecu's have a smaller eprom that becomes a roadblock to tuning. You'll have to use the correct o2 sensor for the ecu you're going to use. Sleeper, that stalling issue is easily fixed by increasing the minimum pw table @ 0x3E80 Bernard Quote Link to comment Share on other sites More sharing options...
cbuczesk Posted January 21, 2004 Author Share Posted January 21, 2004 Sounds like you modified the ecu yourself. What did you use to do that? How hard is it to do that? Chuck Quote Link to comment Share on other sites More sharing options...
datsunlover Posted January 21, 2004 Share Posted January 21, 2004 Just curious.. has anyone used the Z31 ecu/harness/sensors to run a Non turbo 2.8 motor? (like whats in my 75 280z for instance..) I am trying to figure out a way to get rid of that evil AFM, and was going to upgrade to a 280zx dizzy anyway.. Im sure it could be done.. just wondering if anyone has attempted it yet? I got to thinking of this because I know where a car is (waaaayyyy in the back of a wreckers) that I could pull evrything from... probly for $50. Any info floating around out there? Quote Link to comment Share on other sites More sharing options...
Bernardd Posted January 21, 2004 Share Posted January 21, 2004 Sounds like you modified the ecu yourself. What did you use to do that? How hard is it to do that? Chuck There are a lot of pages dedicated to Nissan ecu tuning. The 88 ecu's behave very similiarly and have much of the data in the same locations as the z32 ecu. This page explains it very nicely: http://cherrypicker.tripod.com/turboupgradeforvg30dett/id10.html NA ecu should work fine. Quote Link to comment Share on other sites More sharing options...
cbuczesk Posted January 23, 2004 Author Share Posted January 23, 2004 There's a lot of good info at that site. Maybe too much! I'm not clear on one thing. Can I "tune" the Z31 ecu completely or is that only for the Z32? Has anyone here tuned a Z31 ecu for a 280ZX turbo engine? Chuck Quote Link to comment Share on other sites More sharing options...
Bernardd Posted January 23, 2004 Share Posted January 23, 2004 There's a lot of good info at that site. Maybe too much! I'm not clear on one thing. Can I "tune" the Z31 ecu completely or is that only for the Z32? Has anyone here tuned a Z31 ecu for a 280ZX turbo engine? Chuck The z31 ecu is tunable. Not all the tables are identified but it's being worked on. I have a "romtuned" ecu running my L28et. I know of several people that have tuned the rb30et ecu as well (same ecu) as at least one person who's tuning his z31 ecu for his setup with a wideband. I will be using a wideband next summer along with an emulater packaged with trace software to tune my car. JWT does z31 ecu conversions for the L28et. Quote Link to comment Share on other sites More sharing options...
cbuczesk Posted January 23, 2004 Author Share Posted January 23, 2004 You've been a lot of help, Bernardd! Is there a site that discusses tuning the Z31 ecu? I'm going to get the car running with the L-Jet because it ran well before the swap. While I get things sorted out I want to do more research on programming a Z31 ecu. I'll have to get a wideband, logging software, etc. sometime. I appreciate the help! Now if I could just find a Z31 fi system... Chuck Quote Link to comment Share on other sites More sharing options...
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