Thread: ECU help... what do I have going on here (Pics included)

So there it he ecu harness... obviously looks like it's adapted, is this the OBD2 to OBD1 conversion I've read about?
https://www.facebook.com/photo.php?fbid=1451890595069076&set=a.1451877675070368.1073741842.100007444471645&type=3&theater

Here is my current ECU, was told it was tuned, not sure how or if I can tell by who, car runs VERY strong so I can't help but believe it has been tuned.
https://www.facebook.com/photo.php?fbid=1451890558402413&l=01a0fed98f

Old ecu, came with car when purchased, no clue about it.
https://www.facebook.com/photo.php?fbid=1451890641735738&l=db1dca2700

Car is a 96 200sx SR20DE+T (Do not believe it is the SR20DET)

The white plug attached spliced with a blue plug denotes a stepdown harness. No way to tell who tunned the ecu but if you unscrew the top of the ecu and find an extra eprom board and chips then yes,it is a tunned ecu.

I figured it was a stepdown adapter too... but step down typically implies what, OBD 2 to 1?

Or is there a "step down" that goes from say an older OBD2 ecu to a newer OBD2, or vice versa I guess is a more clear question.

It is a stepdown harness in the sense that someone took a obd1 wire loom and spliced it into a obd2 wire harness. Then they just plugged up a obd1 ecu. The eaisiest way to differentiat obd1 from 2 is that obd1 is blue( hence the saying blue plug ecu) and the obd2 plug is white.

OK Gotcha... so then may I ask this... WHY? What are the benefits?

These help shed any light on my ECU? Is that all original stuff?

https://www.facebook.com/photo.php?fbid=1454373781487424&l=5c9f7f6fed

https://www.facebook.com/photo.php?fbid=1454373761487426&l=947876bd1e

https://www.facebook.com/photo.php?fbid=1454373744820761&l=84f4094f89

What I am trying to find out is what I have, the car came with 2 ECU's, pics above, (Red writing & Black writing), was told the "tuned" ecu is in the car, the other he knew nothing about. (meaning the guy I got it from was the the owner who installed the ECU. So I know nothing about the tune, car runs really well, I am sure I wouldn't change anything just yet, but been thinking about bigger maf, hence the need to know whats up.

That's a a basic chipped daughter board. In order to retune, the chips have to be removed and placed in a reader/programmer and then a bin is uploaded to the chip. That looks to be a calum or pmls knock off. the schematics have been available for years and they are cheap to make.

I'd advice against making changes to the MAF/Injector/Turbo setup at all, before getting your hands on some way to tune. Burning roms is so late 90's, why not get your hands on a realtime tunable ECU, like Nistune or Nismotronic? Damn, I should be paid for advertising Nismotronic in so many posts , but I can't help it, it's such a great tool.

It's hard for me to grasp that some people still play around with burning chips, and even tuning without a wideband :O. Don't change anything until you can improve it on the tuning side

I really didn't plan to, that's why I am asking because I would like to identify everything I have and go from there.

I don't see me upgrading to a BAT (Big Ass Turbo) any time soon, I mean jeesh the thing is fast as heck now... I can only imagine with a "real" tune.

I know everyone says "WIDEBAND" and soon I will get one, but I do currently have a narrowband, EGT, boost, Oil Press, guages. The NB seems to be accurate enough to tell me when I had a leak (showed lean) after fixing it, right back to stoic (however its spelled), and more importantly when I accelerate it clearly climbs and holds 1 or 2 lil lights away from "rich" so I feel pretty confident if I "leaned" out that guage would AT LEAST show me that, NO??

Sucks that I bought it from someone who bought it from the builder, so my info was limited. It seems like the fuel pump has been upgraded (or at least changed) but I assume upgraded because the injectors are upgraded, FMIC, HKS BOV, MSD 6A, no smog crap, the modded ecu (for what it is), etc...

Anyhow I was just hoping to identify the ecu/chip in hopes I could at least see if it was tunable by laptop/obd or whatever. Guess not :-/ lol