18436572

Could I get a fuel preasure sensor and wire it into the oil temp pins on a 7730 and be able to log it in the aldl data stream?

I know that it would take some rescaling in the ADX file and possibly the bin also.

http://www.amazon.com/s/ref=nb_sb_no...delco+13500744

This is the sensor that I was planning on using.

Any opinions?

RBob

iTrader: (1)

That's pin F12? It has a 348 ohm pull up to 5 volts on it. Will likely need to buffer the output of the pressure sensor to properly drive that input.

RBob.

18436572

I always seem to open a can of worms! It seemed so simple.

Thanks for the reply. Is there a better choice of sensor?

I will just have to jump on the ecm bench and see what hapens.

xch3no2

One of the regulars here was working on finding an alternate, but most of us are using the the Autometer for our pressure range. $1oo Summit or Jeggs.

Saar

buffer?

for situations like this, the 7727 and 7730s seem to have an abundance of A/D channels that have pullups on them, i opened mine up and eventually found the resistor, removed it, repositioned it, and made it a pulldown to ground. didn't know if there was any other option.

RBob

iTrader: (1)

That can be done. But that means that there is a modified ECM in the works. All depends what one wishes to do. I just stated that a straight forward pressure sensor is unlikely to properly drive that input. Which is what most folks are looking for.

That is, being able to hook it up and go. No muss, no fuss.

For what you mentioned, can modify a whole bunch of inputs. And outputs for that matter. If so important to you, post pictures & a guide so that others can do the same.

RBob.

Saar

i've tweaked mine around so that there's only one pullup channel left open i think, one that uses a resistor that GM already defined a conversion table for, in case i need more than the IAT/CTS/trans temp/knock/ALDL pin B i'm using now.

it's on a 16149396, so it will directly apply for 7727s, but 7730s might need to do some circuit tracing, i can't remember how similar the board is in that area.

i might have to wait until my wife's new camera arrives though, mine doesn't do so well with close up shots. unless someone else can post some closeup pictures of a 7727 board?

as much as i'd like to not have to modify the internals, i'm essentially trying to build the ultimate MPFI P4 ECM with a mask to utilize the full extent of the hardware.

18436572

I would be open to this but I am going to play with some sensors first and see where I get. I am going to pick up a sensor today and play with it.

I think doing it without moding the ecm would be the preferred way just because there may be someone that wants to do this and doesn't feel comfortable with cutting on a ecm board.

18436572

I am wanting a less expensive option but I will look into it.