[Diy_efi] alpha-n

[Adam Wade]

--- bill SHURVINTON <bill at shurvinton.fsworld.co.uk>
wrote:

> The problems with highly modified setups with IR TB
> setups is that the MAP signal tends to bounce around
> at idle. This can be cured by a number of
> techniques.

The one I am aware of is timing your sample (and I am
gathering that the sample woudl best be taken
immediately before the opening of the intake valve). 
What other methods are employed, and how well do they
work?

> The other is that you can effectively reach a WOT
> situation at less than full throttle (from a MAP
> perspective), but it is still handy to be able to
> modulate power with AFR ( up to the
> limits of your engine YMMV).

Indeed.  I have trouble thinking of any good reason
NOT to run alpha-n at 75% throttle or better.

> Then you get turbos which are alpha-N plus boost
> (Ferrari).

The old turbocharged motorcycles from the 80s used the
same method.  Are the Ferraris using that technique
all Weber/Marelli systems?  I know Marelli loves to
use alpha-n wherever possible (witness Ducati).


=====
| Adam Wade                       1990 Kwak Zephyr 550 (Daphne) |
| "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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