Link monsoon - RB25det auto

hi!

Im about to put a Monsoon into my nissan stagea WGNc34, rb25det s1,5/2 wit ha automatid non triptonic transmision.

Im goign to use the monsson to controll the engien and the oem ecu to controll the gearbox, but im unsure what the ECU needs to controll the gearbox.

Do anyone have the answer to this befor i start cutting wiers? :)

If somone have experiance at all doing this its apreshiated!

I've looked into this and unfortunately given that the factory ECU controls the auto completely, it's going to be looking for the already finnicky factory CAS signals as well as TPS. I've been tinkering slowly but surely with building a patch harness with integrated buffer circuit but it's been low on my priorities as my Stagea is currently my daily.

I have heard this aswell, and the plan is to split the signal to the monsoon and the oem ecu to compansate for that, i just need to be sure i let the oem ecu have all the rigth stuff to work.

A friend of mine had a r33 with a auto non triptobic and used power fc on it, figurer when rpm was over 7500 thr gearbox locked on itself and had to blir the throtle To make it shift, under that it shifted fine, had somthing to do with it having 1 or 2 selinoids, but I dont remember 😅

I have started to wier in the ECU, but came to a stop when i was about to conekt the TPS, i have 3 wiers, Ground,+5 and AN volt, im splitting the signal to OEM ecu and monsoon, so i want to only split the Signal, and let power and ground stay from the OEM ecu.

I have been told i should let as mutch as i can be controlled by the oem ECU, so trying to do the "bare minimum"

So i have goten the car to work "kindof"

The car starts and runs, but its getting massive distubance in the trigger and TPS both at idle and under load, i have tryed a few different thing.

1) Wier up new signal wier from ECU -> Cas

2) run new groudn wire

3) Run the cas direktly into the Monsoon witout it sharing signal with factory ECU

Im running factory CAS with factory Trigger, have tryed changing it with a different one with no change.

Looking for any sugestions and advice here.

The factory optical CAS on RBs is notoriously unreliable so I'd take that with a grain of salt. If you're also seeing odd instability on the TPS side of things I'd scope the sensor ground you're sharing.

I have orderd a AEM Trigger disk to try that, the Monsoon is only getting shared signal from CAS and TPS due to the auto gearbox.

Gonna look at the grounds later hoping it s so simple