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Ecu Plugin Development - Spare M35 2.5L Ecu Laying Around?

Jason Broadhurst
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Jason Broadhurst Enthusiast

Jason Broadhurst

Posted
Posted

Hi guys!

I've got an itch to develop a plugin for my M35 2.5DET. It will use an Adaptronic 1280 ECU and a patch harness.

The ecu selection will be because I'm pretty familiar with Adaptronic's now days, and also because the 1280 has an unlimited scope for programming auxillary outputs. This can be used to drive the auto ecu, dash stuff and anything else required. The 1280 is fairly special in it's function block approach to aux programming.

Hardware wise, I will need a ECU (can be damaged I only need the plug/internal pins). Instead of plugging the stock ECU in, it will have the plug and then wiring off to 1280 instead.

I will develop a loom and tune while retaining all the standard functions of the stock ECU. While I am there I will create a detailed pinout of the ECU as well as a value table for each pin (voltages, signal etc)

Does anyone have a broken ECU laying around, or knowledge of where the plugs are available from? Can someone clarify if I can use any 3.5/2.5L ECU, they should have the pins just no internals if the pin is un-utilised for that model.

Cheers, Jase

Brick Mentor

Brick

Posted
Posted (edited)

I am about to have the 920 adaptronic installed. Are you sure you wont still need the standard ECU installed as well?

I know with my install i do.

Edited by Brick
Daleo Grand Master

Daleo

Posted
Posted

Good luck with this Jason; many hands make light work with this sort of thing.

There are a few guys who have spent a lot of time & money developing solutions for these cars; it would be great to see what some new blood can uncover.

Cheers, Dale.

Jason Broadhurst Enthusiast

Jason Broadhurst

Posted
  • Author
Posted

I don't want to butcher a working ecu if I don't have to.

If any ecu can go full stand alone, it is the 1280. There is a lot to output I think.

I'll keep an eye out on ebay but was hoping for a easy find.

Commsman Veteran

Commsman

Posted
Posted

Good luck Jason - I hope something comes of this.

Does the 1280 talk M35 CAN bus? Could be a tall order to control dash/auto g'box etc without the factory ECU involved somewhere along the line.

stripey Collaborator

stripey

Posted
Posted (edited)

from reading a bit lately the canbus system uses coded electronic pulses to send to different addresses ( sensors gauges ect ect ) on the same pair of cables.

correct me if i'm wrong ( could very well be ) but I don't think anyone has cracked the code ( sequence and duration of pulses ) for the M35 canbus specifically the vq25det.

mind you I hope I am wrong and this proves to work out for you jason

Edited by stripey
scotty nm35 Grand Master

scotty nm35

Posted
Posted

I have a blown one here I will kindly donate to the cause, but unfortunately you are bound to have many issues with this idea. I would be leaving the factory ecu in place, like HKS did with the fcon. Even GTR's leave the factory ecu in place in many cases to keep the attessa etc happy.

The Canbus is simply too different from anything else, most readers won't even pick the ecu up, let alone the other 6 computers in the car.

The electronic throttle will stump you without going cable, it is just too dangerous to run without protection using the twin TPS signals through an opamp to kill power when there is a discrepancy.

The cams are self learning. They change angle constantly and a slight oil viscosity difference will cause a completely different phase angle for a single PWM input. The stock ecu actually learns as the oil warms up and adapts. Quite complicated, and for this reason Haltech didn't incorporate throttle and cams into their 350z plugin until the latest Platinum pro unit. The 3 older ones used the stock ecu and were piggybacked afaik.

Anyway, not trying to be a naysayer, just easier to leave the stock ecu in place and trick it into staying happy imo. I am more than willing to go through all this on the phone if you want to bounce some ideas off me.

  • Like 1
Jason Broadhurst Enthusiast

Jason Broadhurst

Posted
  • Author
Posted

Interesting. The can seems a little more tricky than expected then.

Closed loop cam control should be easy with the 1280.

Throttle is of concern but with some failsafe logic and hardware like Scott mentioned very possible.

Want to pm me a phone number Scott, I'll give you a call when you are free.

Jason Broadhurst Enthusiast

Jason Broadhurst

Posted
  • Author
Posted

If anyone has a engine loom with a good condition ECU plug, it would help also.

If I can't get a stand alone to work perfectly, a patch loom in parallel with the stock ECU is always an option.

I am happy to pay for these things guys!

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