How much gasoline to start car?
12-18-2012, 07:47 PM
#1
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How much gasoline to start car?
OK here's a technical spec question for ya.
How much gasoline is used to fire up a 5 litre 928 engine? I'm wondering about gasoline usage caused by starting the car multiple times each day.
Related: what is the expected rate of fuel consumption at low idle?
How much gasoline is used to fire up a 5 litre 928 engine? I'm wondering about gasoline usage caused by starting the car multiple times each day.
Related: what is the expected rate of fuel consumption at low idle?
12-18-2012, 09:31 PM
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until your ballast burns out from turning them on and off and has to be replaced thus washing away your "energy saving profits" of turning them off all the time ..don't get sum'tn for nut'n!
12-19-2012, 01:29 AM
#6
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Carbs used to need pumping to start, and I think that took a fair amount of fuel, but FI can restart efficiently enough it was worthwhile to stop/start the motor at traffic lights. With a hybrid electric the motor might not even start in normal use.
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12-19-2012, 11:16 AM
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Must be a pulse width defined in the fuel map for start-up conditions. I'd be curious to know how soon the computer backs it down once the engine's running ...
12-19-2012, 11:34 AM
#9
Race Car
LH 2.3 has a warm up map. A stock one looks like this:
It also has a starter cranking map. The colder it is, the larger the starting pulse width:
Acceleration enrichment also has a map that ramps down pulse width as engine temperature increases.
Dan
'91 928GT S/C
475hp/460lb.ft
Code:
ºC -31 -24 -15 -8 0 8 14 23 31 39 50 63 75 95 97 ºF -24 -11 5 18 32 46 57 73 88 102 122 145 167 203 207 158 128 103 85 72 59 49 35 29 24 18 11 4 0 0
Code:
ºC -31 -24 -15 -8 0 8 14 23 31 39 50 63 75 95 97 ºF -24 -11 5 18 32 46 57 73 88 102 122 145 167 203 207 104 92 68 56 46 35 24 14 12 10 6 2 0 0 0
Dan
'91 928GT S/C
475hp/460lb.ft
12-20-2012, 04:48 PM
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Lots of variables but most seem to think that idling for 10 seconds is the B/E for shutting off the engine at stop lights to save fuel. A few state up to 30 seconds but that may predate modern fuel injection. The "automatic stop/start" is becoming more common as more cars are push button start which adapts well to additional computer control.
12-21-2012, 03:15 AM
#12
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