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Old 04-04-2011, 11:39 AM   #41
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ok I joe perezed this for academic purposes.

my car restarted when hot:

idling normally I idle at say 1000 rpm.
injection is about 1.87ms and 1.6% duty cycle.
that's 1.6% of the time, the injectors are squirting.
so for 10 seconds, i'm squirting 160ms worth of fuel.

a recent log's restart shows:
about 300ms of 6ms PW (1.4% duty, 225-480rpm)
about 150ms of 10ms PW (6.4% duty, 600-750rpm)
about 1000ms of 3ms PW (1.5% duty, 600-900rpm)

multiply the starting duties by the duration and you get
4.2ms of squirt
9.6ms of squirt
15.0ms of squirt
-----
28.8 ms of squirt to restart.



so I was wrong.
it's less than 2 seconds of idling. 28.8ms/1.6%=1800ms
(my car takes about half a second to fire and another second for after start enrichments)
keep in mind also the engine speed is lower during startup so you inject fuel less often.

if my maths are off, someone correct them.
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Old 04-04-2011, 11:57 AM   #42
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10 seconds was the same figure that i had seen. thanks for doing the math that i was too lazy to do.

obviously premature starter wear is a consideration. but since i will only do this extra start 2-3 times/day....i'm not worried.
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Old 04-04-2011, 02:20 PM   #43
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Props to Ford for finally bringing a small car to the states that people actually want to drive.

I'd like to see the turbo diesel version that europe gets or as mentioned the Mazda 2 with a diesel.
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Old 04-04-2011, 02:24 PM   #44
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Quote:
Originally Posted by budget racer View Post
reading comprehension fail. i said "long" idle situations. here in NJ we have these lovely things called "jughandles" where you can sit parked for several minutes. are you suggesting that it takes several minutes of fuel to start an engine that is already at operating temperature?
I'm not cheap enough to go through all that to save $0.05. I leave my diesel truck idling for hours at times after 350 mile sprints. It's called being a boss. Get at me, bro.
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Old 04-04-2011, 08:22 PM   #45
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you right dawg. you aint gangsta if you aint wastin' yo hard earned benjamins.

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Old 04-04-2011, 08:33 PM   #46
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I was always anti-American car until I test drove the Fiesta. I was very close to just whipping out my bank card and buying one, but I think I'm going to end up getting something to tow my Miata to the track.
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Old 04-04-2011, 11:53 PM   #47
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Quote:
Originally Posted by y8s View Post
ok I joe perezed this for academic purposes.


Google.

Xerox.

Joe Perez.

You know that you have reached a special point in life when your name is used as a verb.
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Old 04-05-2011, 03:00 AM   #48
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Originally Posted by budget racer View Post
you right dawg. you aint gangsta if you aint wastin' yo hard earned benjamins.

lol? Earn money? Who are you kidding?



BRB - EARNING $$$ - LOLZ

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Old 04-05-2011, 11:05 AM   #49
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Quote:
Originally Posted by Joe Perez View Post


Google.

Xerox.

Joe Perez.

You know that you have reached a special point in life when your name is used as a verb.
congratulations.

the thermostat test was a big coup for you there. you REALLY joe perezed that one.
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Old 04-05-2011, 12:01 PM   #50
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Quote:
Originally Posted by y8s View Post
ok I joe perezed this for academic purposes.

my car restarted when hot:

idling normally I idle at say 1000 rpm.
injection is about 1.87ms and 1.6% duty cycle.
that's 1.6% of the time, the injectors are squirting.
That's 1.87 ms and 1.6% of electrical pulsing, not fuel squirting. You have to subtract injector dead time which is ~1 ms.

But no I don't think that would make the answer go up to "10 seconds".
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