I have still not purchased new injectors, but as of writing I am looking at Delphi Multec 1 95 lb/hr injectors (~1030cc). Currently trying to find a detailed spec sheet, but with little luck. Here is what I know (from http://www.racetronix.com/17113744FM.html):
- Static Flow Rate @ 43.5PSI (300 KPa) = 95.0 lb/hr / 12.0 gm/sec / 998 cc/min
- Dynamic Flow Rate @ 43.5PSI (300 KPa) 2.5ms pulse width and 10ms repetition rate = 2.2 gm/pulse
- Coil Resistance: 2 Ohms / Low Impedance / Low-Z (Peak/Hold injector drivers required)
- Factory Tolerance: +/-5% (actual +/-7%)
- Cone Spray Angle - 17.6 degrees - single spray cone. Approximate cone angle for 90% of spray volume
- Connector: Minitimer (Bosch EV1)
- Ball/Seat Design with 6-Hole Diffuser Disc
- Factory fitted with Viton upper and lower o-rings.
I'd like to have some 'ballpark' figures for the following values. Any suggestions?
- Inj. open time @ 13.2V - 1000us
- Inj. effective rampup - ?us
- injrampup_battfac - ?us
- battfac - ?s
- Injpwm DC - 38%
- -http://www.vems.hu/wiki/index.php?page=GenBoard%2FManual%2FFlyback%2FCalculations
- - Iinj * Rinj = VBatt * dcpercentage/100 - Uflyback * (1-dcpercentage/100)
- - 1A * 2ohm = 14.5V * x - 5.5V * (1-x) -> 2 = 20 * x - 5.5 -> x = 7.5/20 = 0.375
- Injpwm peak time - ?ms
- Divider - ?
- Alternate banks from h[0] - 4..0
- Fire banks while cranking - ?
The low-z injectors will require power resistors. As mentioned earlier, I can source them in almost any spec I want. I understand the resistors are used for current limiting, but how much current am I aiming for? A couple of quick calculations yields a 12ohm resistor for a current of 1A and 5ohm for 2A (both assuming 2ohm injector resistance and 14V supply).
I calculated req_fuel to 2.89 using (6.49 * 2300[cc] / 5 / 1032[cc/min]). Is it worth it to halve this and double my VE values?
As of now I plan to use my current Megasquirt fuel map (with values scaled) as a base map.