Hello.
I plan to turbocharged my DOHC sierra using the 5th injector like TT kits use.i have built the exhaust manifold, downpipe, inlet elbow and mounted the intercooler.

I plan to keep the stock ECU and use a microcotroller to control the 5th injector.

So the problem.What to do with the MAP sensor?

I`ve tried to use a microcontroller (Arduino) to filter the frequency.Now i`m getting 37 code (Map sensor voltage low).
I have also tried low pass filter (speaker type) and an one way valve inline with the sensor.No result.


I`m all out of Ideas.
Stand allone ECU are out of the question as they are very expensive in my country.

Tnx in advance.