MAP Sensor

[robbt33]

Subject: Re: MAP Sensor

Hi chris,

Any idea how much supply current this sensor takes from 5V? If
its not more
than a few milliamps (10-20mA), you can power it from the 5V
signal on the
LM-1's 7-pin Aux connector. This won't work with our
rpm-converter or other
accessories though, because they intentionally do not provide
accessible
5V. You could make a simple breakout cable though using a
mini-DIN8 male
and female plug. Mini-DIN8's WILL plug in the Mini-DIN7
connector, just the
numbering scheme is different and one pin will be unused.

Regards,
Klaus



At 10:53 PM 10/9/03 -0000, you wrote:
> Anybody have any recommendations on a 3-bar map sensor for
use with
> I have been searching around the net and have come across a
> I believe the GM model requires a 5V supply and not 12V so I

> would have to put together a 5V regulator board.
>
>
> Thanks.
>
> Chris Fillyaw

[robbt33]

From: Klaus Allmendinger <klaus@innovate-tech.com>
Date: Tue Oct 14, 2003 2:16pm
Subject: Re: Where to find a compatible 7-pin mini-din

Hi,

IF your MAP sensor and/or TPS sensor have 0..5V outputs, you
can hook them
up immediately. Get a Macintosh serial cable (one that has all
8 wires) and
cut off one end. This is a Mini-DIN8 connector, but it will
plug into the
Mini-DIN7 on the LM-1. The manual has pinouts for the
Mini-DIN7. Just ohm
out the Macintosh connector to know which pins go where. Use a
volt/ohm-meter. First figure out what the ground lead is. It
will have a
very small resistance between it and power ground of the LM-1.
Then switch
the LM-1 on and measure the voltage between each pin. One of
them will be
5V. This is intended as power supply for the rpm-converter and
Aux-box.
Don't screw with it. Cut the lead off so it cannot short to
anything. Then
start the LM-1, wait until it's heated up and press Record.
Ground all
remaining wires. Then connect a 1.5V Battery between the
ground lead (-
side of battery) and each remaining wire in sequence
(ungrounding it first,
when you're done, ground it again). Write down the colors in
sequence. The
log will show the sequence of the input wires as you have
connected them.
Then you can hook them up to whatever. A GM MAP sensor runs
off 5V and puts
out a linear signal. You just have to figure out which voltage
corresponds
to what pressure. Same for the TPS sensor. In the LMConfig
software you can
right-click on the "Import as Voltage" checkbox and set the
unit and
equivalent range for each input so you can get it (MAP for
example) in kPA,
PSA, PSI, mmHg, bar or stones per square acre.

Regards,
Klaus

[robbt33]

From: Klaus Allmendinger <klaus@innovate-tech.com>
Date: Fri Oct 24, 2003 6:56am
Subject: RE: Will this work to measure boost?

Yes,

It will do. However a GM MAP sensor can be had much cheaper.
GM MAP sensors
operate of 5V and come as 1 bar (N/A engine), 2 bar (15 psi
boost mas) or 3
bar (30 psi boost max). They are linear 0-5V output (or
thereabouts). 0V is
full vacuum, 5V is max pressure.
You can set the LMConfig datalog page to directly give you
pressure instead
of voltage. Right click on the 'Import as Voltage' check box
in the datalog
page. You will get a dialog box where you can specify the unit
(kPa, PSI,
mmHg, bar or stones per acre or whatever you want), the
equivalent voltage
for the minimum value and same for maximum value. If the
sensor is linear
(which the GM is), the datalog will be loaded converted to the
specified
input. This DOES NOT program the LM-1 differently. The LM-1
just digitizes
the input to a number between 0 and 1023, equivalent to 0 to
5V always.
Setting the input as above just changes how the datalog
downloader
interprets that number.
The same is true for example for TPS voltage. You can directly
convert it
into % of WOT for example. IAT will be more difficult, because
IAT sensors
are typically non-linear.

Regards,
Klaus

[robbt33]

From: Klaus Allmendinger <klaus@innovate-tech.com>
Date: Fri Nov 14, 2003 6:31pm
Subject: Re: Re: show 3D graph

Hi Shawn,

Unfortunately not. The Motorola sensor we are using comes in
either 15, 30
or 100 PSI. The 100 PSI would be too noisy and non-linear for
a N/A
application. That's why in the auxbox you can switch off the
internal
sensor for each input and use an external sensor like a GM 3
bar.

Regards,
Klaus



At 01:59 AM 11/15/03 -0000, you wrote:
> Any way to get that with a 3 bar? I push more than 1 bar
boost
> daily. If not, I guess I can use an external 3 bar map?
>
> Shawn
>
>> Cable 3 (aux-box) has a built-in MAP sensor (2 bar). To be
hooked
> up with
>> tubing to a MAP source behind the throttle body. It's
switchable
> to use a
>> 0-5V external signal instead just like all the other
inputs.
>