[Diy_efi] TPS or MAP Sensor ?

[Adam Wade]

--- Karl Doody <karl_d70 at hotmail.com> wrote:

> I have a question for you with regards to running an
> engine on a Throttle position sensor or a MAP Sensor
> for the engine load feed into the ECU.

Well, a TPS is not going to tell you much about engine
load, although it will deliver excellent throttle
response in most cases.

> The current ECU i'm running is a GEMS EM20 and at
> the moment i'm using a TPS sensor to measure engine
> load

TPS tells you very little about engine load,
especially in something like a small aircract, I
should think.  MAF would be ideal, and MAP should be
plenty sufficient.  I'm sure as a pilot you are well
aware that you can get the same rpm at the same
airspeed with different throttle positions and prop
angles.

> now the engine is for use in  small aircraft and
> because the propeller can be changed from one pitch
> to another the engine load line moves within the
> ECU's maps and it's causing a bit of a problem in
> that i have to remap the engine for each propeller i
> use.

No ya don't.  ;)  You could make a table for prop
angle, and measure it using a pot on the pitch
control...  Or you could add a MAF or MAP sensor and
use that...  The combination of a MAP and a TPS shoudl
tell you everything you need to know, I think.

=====
| Adam Wade                       1990 Kwak Zephyr 550 (Daphne) |
|   http://y42.photos.yahoo.com/bc/espresso_doppio/lst?.dir=/   |
| "It was like an emergency ward after a great catastrophe; it  |
|   didn't matter what race or class the victims belonged to.   |
|  They were all given the same miracle drug, which was coffee. |
|   The catastrophe in this case, of course, was that the sun   |
|     had come up again."                    -Kurt Vonnegut     |

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