[Diy_efi] :dynos and tuning

[Shannen at grolen.com]

Neglecting low speed, around town driveability and efficiency will cause
some poor results in many parts of the country.  I don't know where
you're at, but heavily populated areas often require considerable amount
of stop and go driving.  You may be able to ignore this in a bike, but
if you're tuning a street car you won't be very popular for very long.
Shannen
DI>--- William Shurvinton <shurvinton at orange.net> wrote:

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

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

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

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

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

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

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

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

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