[Diy_efi] :dynos and tuning

[Adam Wade]

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

>> Wouldn't you get basically the same effect by
>> changing gears so that you had an engine speed
>> where your desired throttle opening corresponded to
>> the power output you desired?

> I guess so, but you might end up needing more gears
> than I have and you may have to trade flexibility.

Well, unless your engine is ridiculously peaky, 5 or 6
should be fine for most things, especially if we're
not talking about a racing vehicle.  Beyond that it's
down to whoever set the gear ratios doing their job
well...

> Also you have to know what the desired TPS% vs power
> curve in each gear looks like and for a street
> driven car that has to relate to how you want it
> to behave.

That's something that requires a lot of
trial-and-error to obtain, I would think.

> I appear to have steered this thread into
> the 'drivability' domain.

Nothing wrong with that.  ;)  To me, the only place I
REALLY would care about that would be high-speed
cruise, since I doubt very much that the fuel
efficiency would be dramatically different with
different settings when there's little to no air drag
using up power (30 mph?).

=====
| 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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