[Diy_efi] RE: Diy_efi digest, Vol 1 #413 - 12 msgs

[Adam Wade]

--- William Shurvinton <shurvinton at orange.net> wrote:

>> I can't grasp why terminal velocity tune loses
>> power in lower gears

> I'm being very dopey or there is a contradiction
> here with your original answer. Probably the former.

Heh, okay, I'll take another stab.

In low gears, you're at low speed.  Very little wind
drag.  The vast majority of the power goes into
acceleration.  Quick acceleration means you move from
cell to cell on the map very quickly.  If there is bad
tuning on a particular cell, the ECU spends so little
time there it may be undetectable in an acceleration
run.

The higher the gear, the faster the vehicle, and the
more wind drag.  Acceleration happens much more
slowly, because you are having to overcome increased
wind drag as well as accelerate the mass of the
vehicle.  You spend a lot longer on each cell of the
map, and any problems in a cell become more apparent
and easier to perceive.

=====
| 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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