MSefi.com read only forum (Jan.15,2018)

Hi to all...
I want to install Ms as piggiback on my car, leaving (for now) mayor of the controls to the standard ecu.
But i've a problem...
My ecu uses bias resistors, that switch for gain resolution...
How i can mount both ecu's?
I've already read the megamanual about this, bu i don't like the idea that ms sees the wrong temp in warmup...
I'm planning ot create an adpter circuit, but i'snt an easy thing...

vauxhall have a funny way of doing things i wanted to make an adapter for mine so if anything went wrong i could swap bk to the original ecu but i couldnt get it to work due to the way the main relay was wired

carnt u just tap into the sensors just after the plug ???

Actually i'm not having troubles wiring the ecu in parallel...
I'm planning to put a connector only for injectors and sparks, that i can swap both ecus when is needed.
The problem that this is my first aftermarket ecu, and i want that both ecus work together.. In fact, i'm planning to done thing in these steps:
1) get ms read same signal as stock to see if it's working right with no resets and other bad things.
2) get ms to use the injectors and get a stable map
3) let ms to control spark and get a stable map
4) Idle and other minor things.
5) Remove completely the stock ecu and carry always it with me...

But i'm stuck at the first point!

The problem, is that the stick ecu uses 2 biases resistor, and switch them at a certain temperature, and MS don't like this...
If i let ms to control all the thing immeditely, i not have this problem - But i can't respect the above 'roadmap'...

This is the operation that done the standard ecu:
The initial signal that i get from the cts is near 1,7v at 18°c. I've calculed that here the bias resistor is 3,9k.
When the car warms, the voltage drop at about 0,8 volts, then switch at near 3,5 volts (bias resistor swap). Now the calculed bias is near 350ohm.

I need to get from this a valid ramp so that ms have a valid signal to work with...

The signal is like this:


I'm not a wizard with analog signal conditioning, so i not say ho to slove this problem...

Anyone have a a suggestion for me???

Really thanks!

My idea is to disasseble the original ecu, find a 0-5 signal when the ecu swap bias resistors, and after this get some signal conditioning...
This evening i made a table with values that ms want, so that i can compare what work is involved in the signal conditioning...
Probably i'm not able to made an analog converter, but i know how to work with pic... A little pic with adc, 1 input, 8 outputs and a r/2r dac and i can done a basilar digital signal contitioning... But with analog it's much more simple! Only choose components and wire!

Any ideas?

Thanks!