Jump to content
SAU Community

Removing Piggyback Ecu

greensa14

By greensa14,
in Engines & Forced Induction

 Share

Recommended Posts

greensa14 Collaborator

greensa14

Posted
Posted

Hi all,

I got done by the EPA. I need to remove my Piggyback ECU (UNICHIP). Is it just a matter of pulling it out, and removing the relevant wired up connections?

I also have larger injectors, and Z32 AFM. I will be removing these and replacing with stock items.

Once these are removed i just reset my ECU and the car will run?

Or is there anything else i need to do for it to run off standard computer?

Link to comment
https://www.sau.com.au/forums/topic/315807-removing-piggyback-ecu/
Share on other sites
Dose Pipe Sutututu Grand Master

Dose Pipe Sutututu

Posted
Posted

You will see that some piggy backs actually run in series with the ECU wiring, just remove the piggyback & join back the relevant wires.

As long as you replace the aftermarket larger injectors & Z32 your car will run fine off the standard computer. Also make sure your base timing is correct to, the previous owner/tuner may have adjusted the CAS to suit the piggy back.

Turbo Dave Collaborator

Turbo Dave

Posted
Posted

I pulled the Kick Panel off my GTR today, when I bought the car I was told it had a MIMO Piggyback (Dunno What that is) but cant actually see anything that looks like an ECU of any kind only a little brown box with some heavy gauge wires coming out of it, Plenty of Splicing though!!

post-34973-1270690830_thumb.jpg

post-34973-1270690891_thumb.jpg

R31Nismoid Grand Master

R31Nismoid

Posted
Posted

greensa14 - totally depends as others have said - how the UNICHIP is installed.

Perhaps get some pics?

If you have to unwire it and so on, it's going to be a pain in the ass.

You'd be better off with a PFC or something that is a replacement setup - 30 sec to remove from the factory harness.

Ok thanks for clearing that up I will have to look a little deeper, has Nismo AFM's so there has to be something in there surely!!

Open the cover. I'd say it's a chip on the actual ECU board.

There is no way you'll have aftermarket AFM's without a chip to alter it as there is no wire-in piggy back in those pics :woot:

greensa14 Collaborator

greensa14

Posted
  • Author
Posted

I had a look last night. It is an external ecu that has been tapped in to the other wires on the factory unit to obviously change the readings as they pass through.

So it looks like i need to remove the spliced wires and re-solder the factory ones so they dont bypass.

Yea PFC would be good, but over worrying about defects etc. Dont want anything visible.

Looking at going Nistune.

Duncan Grand Master

Duncan

Posted
Posted

why is a nistune (or unichip for that matter) illegal? they are not programmable on the fly, and the factory ECU is just as retunable as they are.

Surely the final emission is the only issue for legality? Plenty of shops in NSW that can provide a tune that will get you past the emissions test, why would Vic be different?

R31Nismoid Grand Master

R31Nismoid

Posted
Posted
why is a nistune (or unichip for that matter) illegal? they are not programmable on the fly, and the factory ECU is just as retunable as they are.

Surely the final emission is the only issue for legality? Plenty of shops in NSW that can provide a tune that will get you past the emissions test, why would Vic be different?

Nistune can be retuned - the EPA here is retarded is the basic sense, archaic laws with no common sense.

Unichip go through the ADR testing/approvals, Nistune has not and can be retuned anytime.

Unichip you have to go back to them for (assumingly).

darkhalf Community Regular

darkhalf

Posted
Posted

What is the criteria for an aftermarket system to meet ADR over there?

Nistune board can be PIN locked once the tune was able to meet emissions. The only way to retune it then is use the original PIN or reflash the board outside of the ECU

Transport SA documentation I have previously read states that any aftermarket/reprogrammed ECU will not be accepted due to the cost of the emissions testing required. However things may have changed since that was published

Cowboy1600 Grand Master

Cowboy1600

Posted
Posted

Cause we have some whack ideas down here.

A number of rules surrounding car modifications make zero sense.

The 1 intake mod for example. Senseless. No aftermarket ECUs....senseless.

I might get in touch with my local member and get her to ask Tim Pallas for a "please explain".

R31Nismoid Grand Master

R31Nismoid

Posted
Posted
What is the criteria for an aftermarket system to meet ADR over there?

Nistune board can be PIN locked once the tune was able to meet emissions. The only way to retune it then is use the original PIN or reflash the board outside of the ECU

Transport SA documentation I have previously read states that any aftermarket/reprogrammed ECU will not be accepted due to the cost of the emissions testing required. However things may have changed since that was published

Vic is near enough to the same for the sake of the conversation.

PIN lock means nothing.

If its reprogrammable, not factory, its not allowed until all the full testing is done.

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
 Share
Go to topic listing


  • Similar Content

  • Latest Posts

    • MBS206
      Unpeeling the Orange

      By MBS206 · Posted

      I'm normally copping my own abuse from neglecting my daily drivers. "Those suspension bushes will last a bit more", "Don't worry about the oil leak, just keep topping it up". The project cars I'm always doing things slowly on them as I'm wanting them to be done better, and neater, and nicer. Luckily I don't have to deal with 18 year old Matt's "Learning to wire" stuff in the project cars. And there's only one piece of wiring I'm displeased about in the Landcruiser, and it's about to be cut out... However, the box loads of parts that have been going through this place lately for the Landcruiser... Brake pads Brake Rotors Full handbrake overhaul Wheel Bearings Seals Swivel hubs Steering Boxes Half the suspension joints Shocks Air bags (Ones to go in the rear springs for towing) Water pump Timing kit Lower timing case Harmonic Balancer Radiator Lots of other little seals and shits Gas struts for the bonnet New power window switches And god knows what else I've forgotten... Ha ha ha I have my fingers crossed the pinion seals don't start leaking on the diffs, that the transfer case doesn't leak, and the gearbox input shaft doesn't leak, nor the rear main seal. As they're about the only seals I haven't replaced in the driveline! I'm seriously eyeing off buying new caliper rebuild kits front and rear brake calipers... I'll probably recheck all the valve clearances soon too, and hopefully, it should be all good and sweet to haul some long distance trips again!
    • GTSBoy
      Unpeeling the Orange

      By GTSBoy · Posted

      Every time I pull my 3x gauges out of the console and see the crack-addict way that I did the wiring, and I just can't bring myself to tear it all apart and "make it nice", because it is currently working. In fact, the last time I was in there I probably made it worse.
    • Kinkstaah
      Unpeeling the Orange

      By Kinkstaah · Posted

      The best part is when you own the car long enough that you look back and find your OWN ham fisted amateur shit!
    • MBS206
      Unpeeling the Orange

      By MBS206 · Posted

      The annoying part about neglect, is when you start to replace one thing, and find ten more broken things. Ham fisted monkey repairs you normally only find out about when trying to do something unrelated! Ha ha   Neglect you can kind of anticipate the huge costs to fix it all. Ham fistedness is normally a shock the first time your work on a new old car, as everything "looked" good before.
    • MBS206
      What brakes on R34 GTT(Europe)

      By MBS206 · Posted

      For DBA, check out their guide table here. https://dba.com.au/wp-content/uploads/2023/01/Direct_Replacement-Guide-2021.2.pdf   Additionally they have some other guides and info on how to make sure you choose the right pad.
×
×
  • Create New...