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Originally posted by stealth1281: </font><blockquote>quote:</font><hr />Originally posted by Flowbee V6: If distance isnt an issue, full throttle at 2k
what does distance have to do with anything? </font>[/QUOTE]Would you drive 100 miles at 5k rpm?
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Originally posted by TheGreenPunisher: This can be solved mathematically fairly simply. Ill use this example, even though its not technically correct, you will see how it relates.
Lets say that for each revolution, the engine use 1mL of gas at WOT.
Half throttle at 5K rpms would mean
.5 x 5000 = 2500mL in a minutes' time
Full throttle at 2K rpms would mean
1 x 2000 = 2000mL in a minutes' time
The result....half throttle at 5K uses more.
Torque and horsepower curves do not matter here. Only acceleration factors would require the use of torque and HP curves.
The above is the relation under the condition that the RPM's are constantly maintained.
so, according to the formula, if I'm going downhill at 5K rmps (hypothetically of course) giving no throttle at all, i'm not using any gas? I'm not trying to be an *** or anything; just curious.
\'98 3.8L m5<br /><br />whisper lid<br />SLP CAI <br />lsd <br />3.73 gears <br />Flowmaster American Thunder catback exhaust
Originally posted by stealth1281: so, according to the formula, if I'm going downhill at 5K rmps (hypothetically of course) giving no throttle at all, i'm not using any gas? I'm not trying to be an *** or anything; just curious.
-Eric<br /><a href=\"http://www.cardomain.com/id/mustangeater82\" target=\"_blank\">2000 NBM V6 Camaro 5-speed</a> T-top <i>converted</i><br /><b>14.467@95.45mph</b> <i>$0 in mods</i><br /><i>The member formerly known as MustangEater8251</i>
Ah, but keep in mind that at half throttle, the intake manifold is under more vacuum - so the cylinders are getting a smaller mass of air on the intake stroke, and therefore will be using less fuel to keep the air/fuel ratio constant.
Originally posted by TheGreenPunisher: This can be solved mathematically fairly simply. Ill use this example, even though its not technically correct, you will see how it relates.
Lets say that for each revolution, the engine use 1mL of gas at WOT.
Half throttle at 5K rpms would mean
.5 x 5000 = 2500mL in a minutes' time
Full throttle at 2K rpms would mean
1 x 2000 = 2000mL in a minutes' time
The result....half throttle at 5K uses more.
Torque and horsepower curves do not matter here. Only acceleration factors would require the use of torque and HP curves.
The above is the relation under the condition that the RPM's are constantly maintained.
Drivetrain Moderator - "There are no stupid questions, only stupid people!"
2001 Pewter Firebird Y87, M5
Intake, exhaust, just about every suspension part, alum flywheel & ds, Turn One p/s pump and cooler
My Bimmer has an "instaneous" gas usage gauge. At any point in time, I can see my instant MPG. Half throttle at 5K RPMS keeps me at 15 - 20MPG on the guage. Full throttle at any RPM buries the gauge.
Full throttle will always be pushing more gas into the motor.
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