Chaotic_FC

now i am looking into a large set of injectors for my next project

mike moran has a set of injectors that put out 600 lbs/hr.



now this injector has a pulse width of 1.5 milliseconds.


now according to my this calculator i copied and pasted from another site, i should be technically able to get all the fuel i need from just these two injectors, but still have a stable idle at 1000 rpm:


calculator website:

http://www.rbracing-rsr.com/calcinjpulse.html



Engine Displacement (CID): C.I.D. -80

Idle Target RPM: Idle RPM -1000

Peak RPM: Your rev limit may occur before the peak value. Peak RPM - 10000
Volumetric Efficiency at Idle is typically 15% to 20%: % - 20

Number of injectors in the System: Injector(s) - 2

Brake Specific Fuel Consumption (.5 for 2 Valve, .45 or less for 4 valve): B.S.F.C. -.65

Idle in Inches of Mercury (In Hg.)
If Idle in Kilopascals (kpa): Then kpa / 3.3864 = In Hg " Hg - 8

Expected Peak Horsepower Peak Hp - 1100

Millisecond (Ms) Injector minimum open time ( 1 to 1.25): Ms. - 1.5

Your Installed Injector size (lb/hr): Lb/Hr - 600

Number of injections per cycle (batch 2, sequential 1): #/cycle - 1

How many strokes per cycle (four stroke = 4): Stroke - 2

Results
Injector Size @ 80% recommended duty cycle (lb/hr): Lb/Hr - 446.875

Max Hp with recommended injectors @ 85% duty cycle: Peak Hp - 1168.750

Max Pulse Width Permitted @85% duty at peak rpm: (Ms): Ms Peak - 5.100

Max HP with Your Installed Injectors @ 85% duty: Max Hp - 1569.231

Idle Millisecond Pulsewidth: Installed Injectors Ms Idle - 1.551

Projected cc's per minute: Installed Injectors, per injector at idle: cc's / Inj. - 17.107

is there something i am missing here???

or could i really have a stable idle with a 600 lb/hr injector?

i would be planning on running haltech E8 by the way.

fritts

iTrader: (5)

160's usually idle around 1.5 ms range. Which I would consider the absolute limit for a minimum pulse width. I couldn't even get a set of my 160lbs to acurately fire at 1.5 ms. Your talking an injector almost 4 times that size at 600 lbs. It aint gonna happen. I would say you may be able to get a 12-13 afr 1000 rpm idle with a 200 lb and 1.5 ms. That's a just rough guess though.

Also they don't talk about lag time in the description. When I'm talking 1.5 ms I'm talking total time so lag time plus map opening. So if there is a normal large injector lag of over 1 ms your gonna be in trouble.