[Diy_efi] Speed-density vs. MAF/MAP...

[Adam Wade]

--- Stewart Prince <sprince at csun.edu> wrote:

> Because of space constraints, it's really hard to
> make MAF work on a motorcycle.

Did you find that stock sportbike airboxes were
insufficient to allow MAF operation?

> On the other hand, speed density can work well on
> engines with large pressure pulses in the plenum if
> the pressure is read at a specific engine position
> rather than at a certain sampling frequency.  I know
> the new Delphi system on the twin cam Harley works
> this way (don't ask me how I know).

I won't, but if you wanted to whisper it in my ear, I
wouldn't tell anyone where I heard it.  ;)

> Didn't the old Ducati engines use the Magneti
> Marelli system with TPS vs engine speed lookup
> tables and no MAP?  They seemed to work very well 
> although each lookup table only worked for a
> specific engine/cam/intake/pipe configuration.

Don't have a manual handy with the Marelli info, but
the Weber/Marelli system found on the 916 and 748 were
strictly alpha-n.  I believe the Marelli ones are as
well, but I need to get my hands on some more shop manuals.

=====
| 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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