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Location:
Kita-Ku, Sapporo, Japan
Registered:
January 2003
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Re: Twin injection benefits?
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Sat, 17 September 2005 07:14
 
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| clubagreenie wrote on Sat, 17 September 2005 16:47 |
Is it ideal to have the injectors maxing out their cycle or should they be over sized to run at say max80%?
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80% is safe.. 90% might be.. depends on the opening and closing rates of the injector..
if duty is too high, then the injector may not fully close or become erratic in operation.. it also depends on how many injection events there are per engine cycle etc...
say it takes 2ms to open and close an injector. at 8000rpm, an engine cycle is 16ms.
1 injection event leaves 14ms for pulsewidth, and 12ms is 80% duty cycle (as measured conventionally) so you have 2ms to spare.
2 injection events means that you have 4ms of dead time, and 12ms of open time, ie 6ms per pulse... if you go above 6ms, the injector doesn't have time to open and close before next cycle.
so yeah, it depends on speed of injector (low impedance driven in peak and hold mode have faster opening times, but low imp with resistor is similar to high imp), and how many injection events.. each extra event per cycle reduces the allowable duty cycle due to the extra dead time needed for opening and closing...
aiui
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| | Subject | Poster | Date |
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Twin injection benefits?
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Dorio86 | Sat, 17 September 2005 05:31 |
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Re: Twin injection benefits?
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oldcorollas | Sat, 17 September 2005 05:57 |
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Re: Twin injection benefits?
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Dorio86 | Sat, 17 September 2005 06:03 |
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Re: Twin injection benefits?
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Dorio86 | Sat, 17 September 2005 06:05 |
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Re: Twin injection benefits?
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oldcorollas | Sat, 17 September 2005 06:07 |
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Re: Twin injection benefits?
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Dorio86 | Sat, 17 September 2005 06:10 |
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Re: Twin injection benefits?
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oldcorollas | Sat, 17 September 2005 06:12 |
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Re: Twin injection benefits?
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Dorio86 | Sat, 17 September 2005 06:14 |
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Re: Twin injection benefits?
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thechuckster | Sat, 17 September 2005 06:23 |
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Re: Twin injection benefits?
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oldcorollas | Sat, 17 September 2005 06:34 |
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Re: Twin injection benefits?
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Dorio86 | Sat, 17 September 2005 07:20 |
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Re: Twin injection benefits?
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clubagreenie | Sat, 17 September 2005 06:47 |
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Re: Twin injection benefits?
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oldcorollas | Sat, 17 September 2005 07:14 |
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Re: Twin injection benefits?
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oldcorollas | Sat, 17 September 2005 07:19 |
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Re: Twin injection benefits?
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gearb0x | Sat, 17 September 2005 07:37 |
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Re: Twin injection benefits?
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oldcorollas | Sat, 17 September 2005 08:01 |
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Re: Twin injection benefits?
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oldcorollas | Sat, 17 September 2005 08:04 |
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Re: Twin injection benefits?
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oldcorollas | Sat, 17 September 2005 08:10 |
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Re: Twin injection benefits?
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Dorio86 | Sat, 17 September 2005 11:45 |
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Re: Twin injection benefits?
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oldcorollas | Sat, 17 September 2005 11:49 |
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Re: Twin injection benefits?
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Yian | Sat, 17 September 2005 12:04 |
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Re: Twin injection benefits?
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Dorio86 | Sat, 17 September 2005 12:10 |
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Re: Twin injection benefits?
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gianttomato | Sat, 17 September 2005 12:17 |
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Re: Twin injection benefits?
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oldcorollas | Sat, 17 September 2005 12:33 |
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Re: Twin injection benefits?
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Dorio86 | Sat, 17 September 2005 12:50 |
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Re: Twin injection benefits?
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Dorio86 | Sat, 17 September 2005 12:52 |
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Re: Twin injection benefits?
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spirokeet | Sat, 17 September 2005 13:00 |
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Re: Twin injection benefits?
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Dorio86 | Sat, 17 September 2005 13:03 |
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Re: Twin injection benefits?
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oldcorollas | Sat, 17 September 2005 13:00 |
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Re: Twin injection benefits?
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Dorio86 | Sat, 17 September 2005 13:05 |
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Re: Twin injection benefits?
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oldcorollas | Sat, 17 September 2005 13:09 |
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Re: Twin injection benefits?
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Dorio86 | Sat, 17 September 2005 13:15 |
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Re: Twin injection benefits?
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oldcorollas | Sat, 17 September 2005 13:19 |
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Re: Twin injection benefits?
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STR8 2.8 | Sat, 17 September 2005 14:13 |
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Re: Twin injection benefits?
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emmac | Sat, 17 September 2005 12:49 |
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Re: Twin injection benefits?
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river | Sat, 17 September 2005 08:41 |
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Re: Twin injection benefits?
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kingmick | Sat, 17 September 2005 10:00 |
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Re: Twin injection benefits?
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spirokeet | Sat, 17 September 2005 12:41 |
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Re: Twin injection benefits?
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oldcorollas | Sat, 17 September 2005 12:48 |
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Re: Twin injection benefits?
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Yian | Sat, 17 September 2005 13:08 |
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Re: Twin injection benefits?
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Dorio86 | Sat, 17 September 2005 13:17 |
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Re: Twin injection benefits?
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Yian | Sat, 17 September 2005 13:21 |
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Re: Twin injection benefits?
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oldcorollas | Sat, 17 September 2005 13:26 |
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Re: Twin injection benefits?
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thechuckster | Sat, 17 September 2005 13:49 |
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Re: Twin injection benefits?
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spirokeet | Sat, 17 September 2005 13:09 |
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Re: Twin injection benefits?
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spirokeet | Sat, 17 September 2005 14:19 |
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Re: Twin injection benefits?
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ed_ma61 | Sat, 17 September 2005 15:10 |
