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Top 2GNT Technical Turbo/Nitrous Tech topic #79001
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Subject: "Is there a mathematical equation to figure out the idle pressure of various injector sizes?" Previous topic | Next topic
jsupetranNov-06-04 01:09 PM
Member since May 04th 2002
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#79001, "Is there a mathematical equation to figure out the idle pressure of various injector sizes?"




          

^^^

New Car:
2004 350z base, Nismo CAI, pioneer avic-n1 (dvd, cd, navi)



Old Car:
1998 GS with hrc stage 2, HID 6000k conversion kit, AEM UEGO wideband, sfmu, ml, prokits, Greddy warning gauges: egt, boost gauge, and oil pressure, apexi tt, haydans tranny cooler, costum dp, groundwires, dynotune fp gauge. gst muff, turbo spoiler
Boostin since Aug 03.

nothing like driving with the windows down and the music low: i love hearing the turbo spool, swwwhhhttt!!!!


  
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mkerleyNov-08-04 05:42 AM
Old School 2GNTer
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#79060, "RE: Is there a mathematical equation to figure out the idle pressure of various injector sizes?"
In response to Reply # 0



          

Injector size and idle pressure are independent. I'm assuming you want to find the pressure needed to have similar fuel delivery with different size injectors. All that can be found at RC's site: http://www.rceng.com

If that's not what you're asking for, try asking again, b/c that's about all I could understand from ^^^ question.

Matt


99GS MT | Star Stage 2 | GC coilovers | HurriganeGS tie bars | Tokico Illuminas | 17x7 Enkei RS5 | Baer track brakes |+

  
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run4cvrNov-08-04 06:23 AM
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#79061, "RE: Is there a mathematical equation to figure out the idle pressure of various injector sizes?"
In response to Reply # 1



          

Corbin's site has lots of good info for any fuel system questions.

http://www.geocities.com/vttalon/tech.html

John 96 GS

  
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jsupetranNov-11-04 06:23 PM
Member since May 04th 2002
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#79205, "RE: Is there a mathematical equation to figure out the idle pressure of various injector sizes?"
In response to Reply # 1
 Nov-11-04 06:23 PM by jsupetran



          

Originally posted by mkerley
Injector size and idle pressure are independent. I'm assuming you want to find the pressure needed to have similar fuel delivery with different size injectors. All that can be found at RC's site: http://www.rceng.com If that's not what you're asking for, try asking again, b/c that's about all I could understand from ^^^ question. Matt



Yeah basically, I need to figure out the psi at idle I would need for 255cc injectors and 270cc. My goal being 6-7 psi. I'll checkout the links.

New Car:
2004 350z base, Nismo CAI, pioneer avic-n1 (dvd, cd, navi)



Old Car:
1998 GS with hrc stage 2, HID 6000k conversion kit, AEM UEGO wideband, sfmu, ml, prokits, Greddy warning gauges: egt, boost gauge, and oil pressure, apexi tt, haydans tranny cooler, costum dp, groundwires, dynotune fp gauge. gst muff, turbo spoiler
Boostin since Aug 03.

nothing like driving with the windows down and the music low: i love hearing the turbo spool, swwwhhhttt!!!!


  
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mkerleyNov-12-04 06:03 AM
Old School 2GNTer
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#79216, "RE: Is there a mathematical equation to figure out the idle pressure of various injector sizes?"
In response to Reply # 3



          

easy enough. I'll make several assumptions though.

1. your stockers are 235cc rated at 43.5psi
2. your stock fuel pressure is 50 (it's rated as a range actually)

the flow rate of your stock injectors is

(sqrt(50/43.5))*235 = 251.95cc/min

In order to equal that w/ 270cc injectors, you would need your fuel pressure to be:
(sqrt(x/43.5))*270 = 251.95cc/min

where x = 37.88psi

from there you'd need to do other calculations and graphs to match the flow rise rate of your stock system (if it has one) etc etc.


99GS MT | Star Stage 2 | GC coilovers | HurriganeGS tie bars | Tokico Illuminas | 17x7 Enkei RS5 | Baer track brakes |+

  
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