|11-01-2007 03:43 PM|
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On the Duratec motors, the ECU measures fuel pressure at the fuel rail and increases or decreases the length of the duty cycle of the injectors so that the correct amount of fuel is delivered. Cranking up the fuel pressure to gain some HP doesn't work (unless you do some serious tuning) as the motor backs off the duty cycle to "restrict" the amount of fuel back to what the motor expects. That's what I learned in 3 hours at the Dyno - but still found 8 HP ;-)
|11-01-2007 03:37 PM|
Chilled fuel does two things
1) Increases fuel density - equal more power per given volume of fuel
2) Decreases flow time through the refueling rig - might save a 10th or two
I don't think that getting the air into the engine is as much a limiting factor as much as how quiickly the fuel can be injected. The window is incredibly short at 19,000 rpm to get the injector to complete it's duty cycle in time for the spark to light off and get the fuel burned (though the spark fires well before the duty cycle is complete - there's just not enough time). The FIA limits fuel rail pressures as a safety issue, so for a given number of milliseconds that the injector has to fire, a denser fuel charge will deliver a significantly greater amount of fuel than one at ambient temp.
Estimates I've read put this at about 10-15 HP for fuel that is 10 degree celiues less than the Sao Paulo ambient.
|11-01-2007 09:02 AM|
|10-25-2007 09:43 AM|
I imagine it increases the density of the fuel, so theoretcally you can have more fuel per stroke.
It is moot point unless you can get more air in to go with the extra fuel...
|10-25-2007 09:39 AM|
|Spinal||what does chilled fuel do?|
|10-25-2007 07:53 AM|
He really is human!
|10-24-2007 02:58 PM|
Kimi on a yacht.
|10-24-2007 01:05 PM|
|MightyMouse||I just got done watching the race since I missed it Sunday and had to wait till now to watch it. I've avoided all media so I could watch to see who wins the championship and even though Hamilton didn't win it like I hoped the only other person I would want to win did. I'm just glad that Hamilton beat Alonso.|
|10-22-2007 10:09 PM|
|10-22-2007 09:29 PM|
|illinipo||^ya fo sho, I wasnt even celebrating after the checkers came out, even tho I was so happy I was like ok gotta wait a week till its all over...|
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