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Author
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Topic: hp limits on 255 pump
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66 AC COBRA
Nitrous King
Member # 904
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posted
 
 
well then its cool, but usually u have nothing good to say about someone who usually sides with shaun
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FFR AC Cobra
72 Vega - WCHRA Extreme 10.5
Posts: 6280 | From: Winters | Registered: Feb 2002
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Jeff S
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Member # 371
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posted
Class is now in session.
Take the following facts and draw your own conclusion:
Duty cycle is the proportion of time during which a component, device, or system is operated. The duty cycle can be expressed as a ratio or as a percentage.
Duty cycle when refering to fuel injectors is the amount of time, in a percentage, that an injector is "open" relative to the amount of AVAILBLE time for the injector to be "open".
In a sequential system, which fires one injector after another, the injector fires once per intake valve event(1 combustion cycle or 720* of crank rotation or 360* cam rotation).
At a given RPM there is only a specific amount of time in which the injector can fire per intake valve event(IVE). Lets use 6000rpms for example:
At 6000rpms there are 3000 IVE's per minute.
So... there are 3000 IVE's in 60 seconds.
Or...300 events in 6 seconds...50 events in 1 second which if you keep doing the math gets you to 1 IVE per .02 seconds which is the same as 20ms(milliseconds).
This means that there are 20ms between IVE's. If the injector fires for 10ms per IVE that means that it is at 50% duty cycle. If the injector remains open the entire 20ms it is at 100% duty cycle.
This is what Sawson doesn't understand. If at 6000rpms there are 20ms of time bewteen IVE's you have less time for the injector to potentially fire then you do at 3000rpms. This is because at 3000rpms there is twice the amount of time for the injector to be open(40ms) between IVE's. And at 8000rpms there is less time for the injector to be open(15ms). Therefore if you have a motor that makes 400hp at 6000rpms it will not need as large of an injector flow rate as an engine makeing 400hp at 8000rpms.
ANY QUESTIONS? ![[Razz]](tongue.gif)
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'90 Mustang LX: 8.53 @ 157.92 w/ 1.33 60' on DR's
'10 ZR1: FOR SALE
'14 E63 S: RENNtech ECU
'04 Gallardo: UGR TTG
Posts: 2121 | From: San Jose, CA | Registered: Aug 2001
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98slowhoe 'FIFTYLX'
Uncle Frank
Member # 895
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posted
Wow Jeff your Hecka Smart man! I think after reading that about 5 times I actaully got it. I don't know much about that stuff but you sounded like you are right.
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AKA Franky Freaking 5 liter
Advanced Engine Development
SCT dealer
Dynotuning
Engine building
916*275*8212
88 4runner on 42's
Posts: 4206 | From: Folsom | Registered: Feb 2002
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93PONY
Mr. Valve Events
Member # 60
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posted
Thank you Jeff.
Maybe the idiot in this thread will now understand. Sure as hell doesn't take a genious to figure this shit out.
Sawson,
If I have something to PM you about....I will. Untill then I will continue to post relevant tech where I see fit.
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www.advancedenginedevelopment.com
SCT dealer
Dynotuning
(916)715-7569
Posts: 4265 | From: Fair Oaks, CA | Registered: Nov 2000
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AaronC
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Member # 86
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posted
Sawson- Can I recommend you stay to the text books, because tech is obviously not your game Stick to what you know... The stock motor ![[Big Grin]](biggrin.gif)
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1991 GT Convertible: Stock 157k mile shortblock, HiTech cam, AFR 165 heads, Edelbrock RPM intake, 1 3/4 headers
12.23 at 112.99
Best MPH 113.97
Posts: 776 | From: woodland | Registered: Dec 2000
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4RS FED
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Member # 2067
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posted
off to street racing ![[patriot]](graemlins/patriot.gif)
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i have a twin turbo mustang and you don't!
Posts: 3686 | From: 650 | Registered: Nov 2002
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MR GO FAST
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Member # 2088
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posted
quote:
Originally posted by ON N2O:
off to street racing
![[Whoo Whooooo!]](graemlins/woowoo.gif)
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1986 Gt that is faster than FOSTANGS pinto
Posts: 3729 | From: ATWATER/SANJO/RWC | Registered: Nov 2002
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hidnn.o.s.
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Member # 1219
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posted
quote:
Originally posted by AaronC:
Sawson- Stick to what you know... The stock motor
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R.I.P. Willie G. You are missed on this forum
Posts: 15950 | Registered: Apr 2002
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Calightning
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Member # 853
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posted
Im a dumbass with a Lightning and even I knew that.
[ August 30, 2003, 11:20 PM: Message edited by: Calightning ]
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Steve 99L Black 03L Grey
Trucks
Dyno Chart
Posts: 27 | From: Castro Valley | Registered: Feb 2002
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4RS FED
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Member # 2067
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posted
ttt
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i have a twin turbo mustang and you don't!
Posts: 3686 | From: 650 | Registered: Nov 2002
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