Mspnp2 and gm flex fuel snesor
 

Not sure if posting in the right section but i have been searching for a while and cant seem to find a clear way to wire a GM flex fuel sensor on my mspnp2. Do i have to run a wire from the ms to the sensor and what pin is it ?

There's whole section for megasquirt questions, you can use just about any analog input. Open up tuner studio and go to the flex fuel stuff, there is a drop down menu for inputs........ Any of the options in that list will work, just pick an open channel and wire it up. I hear there input labeled "flex" is popular.

You do, as well as a pull up resistor. The pin depends on the MS version. Forums will help with the pull-up (search). DIY's instructions are clear as far as which pin to connect.

Probably wont be able to check it until Wednesday i have a couple of stuff to do first. I need to put the engine in the car and finish putting it together i already installed a walbro 450 i was told it was good up to 800 whp of e85.

I tried to research it but wasnt too lucky with the mspnp2 probably will try to contact diy tomorrow and find out exactly what pin is it on my ms version

ms2 has a really basic flex fuel implementation. Not that great. I would consider upgrading to an ms3.

I heard somewhere not to long ago is a ship i upgrade inside the ecu i have. Is that correct ?

Your search kung-fu is going to have to improve or this place is going to torch you

I ll try my best man, cant really count on google

Use google to search miataturbo, not miataturbo's search

And save DIY some time, go to their site and read the install instructions

I tried, diypnp means the one u make yourself or the mspnp (excuse my dumb question )

Try this in google

miataturbo flex fuel sensor

diyauto makes the mspnp2

Cool i ll try it now and thanks

I got this and it says connector is called flex so should i open the mspnp and there is a pin called flex connect a wire all the way to the sensor and call it a day? Also says i should jump the signal and the positive with a 5k ohm

Better

but more is needed grasshopper. Read every thread, even the ones that aren't PNP specific.

you don't need to crack the box, the pin is exposed in the DB connector

By DB i assume you mean diagnostics box am i correct ?

It says on the diy website the pin is DB15

I think i got it. Well i hope. Its in the options port on the ms unit and it the first pin on the bottom right if i am not mistaken

Another article says to connect it instead launch control pin number 13. well i guess i have to try both and find out

How are you going to tune flex fuel?

Based on your other questions and inability To search I'm guessing you did nothing to the fuel system other than drop that massive pump in the tank...... That ain't going to work, it'll overun the stock fuel pressure regulator.

Take about 5 steps back and do more research before your project ends in a part out.

I have a person that will tune it for me

I did upgrade pump and injectors and the rubber fuel lines but i didnt read anything about the fuel regulator

On the '90-'97 cars, the FPR is referenced to manifold pressure, so the fuel pressure will always be roughly 42 PSI (median) above manifold pressure. Or put another way, the pressure differential across the injectors will always be ~42 PSI, and therefore the flowrate of the injectors will be a constant. I wouldnt think that the pump will over run the regulator if i have big injectors ( correct me if i m wrong)

You still gotta idle bud, wot will be fine but I betcha you won't stay at 42 psi under low load.

I leave that to my tuner for the idle. any recommendations on an after market regulator ?