New Saab Engine Tech

[nacelp]

My (dumb guy) way of thinking about it is:
It takes x amount of Energy, to move y weight, z distance. Second two items
are fixed, so the only variable is the engine.  So as long as the engines
say both make 10 HP with 2 lbs of fuel, the mileage will be about the same.
Some theories, don't mean a hill of beans in the practical work, of
measuring real performance.   Like using lots of EGR and/or wide throttle
openings for cruise.  I have yet to get better mileage or throttle response
than tuning for a min TPS value.  Your results may vary.  For highway
mileage it's about finding the engines sweet spot tune wise.  Guy I know is
getting 31 MPG (C/K Pick-up) with a 5.7 vortec being run by a 747.
Grumpy
   Speciallizing in simple explainations (least trying too <<g>>), cause
that's all I can understand lately.....

> I've certainly heard this a bazillion times.  Can someone explain to me
> why I get the same mileage now in my S-10 Blazer with a 5.7L TBI engine
> as I used to get with the stock 2.8L TBI engine?  Granted the 2.8 was an
> '86 calibration and the 5.7 is a '91 calibration.  And I have to admit
> that highway mileage is a little worse, but city mileage is the same.
> The 2.8 was a wimp in that truck, which weighs in at over 4000 lbs.
> Believe me, that engine rarely suffered from "pumping losses".  I've
> also heard plenty of times that the more vacuum you have the better your
> fuel economy is, despite the fact that vacuum=pumping loss.
>
> anyone?
>
> --steve
>

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