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 have located this Delphi webpage: http://go.delphi.com/CS/dpss/catalog/ProductInformation.aspx?PartProductID=FJ10456
Apparently the Delphi part number is FJ10456. The site lists no other useful information.
MembersPage/KevinBlack/InjectorSpecDatabase has a complete looking set of these numbers for the Delphi 95lb/hr injectors. Mirrored here:
Delphi Low-Z 95#/hr (with 30v TS diode and 6R8 resistors)
- Inj open time @13.2V (us) 0 (because of the 30v flyback, from MembersPage/PhatBob/UserGuide, LowZ section )
- Inj effective rampup (us) 512
- injrampup_battfac (us) 4080 (also because of 30v flyback)
- battfac (us) ???
- Injpwm DC (%) 100
- Injpwm DC added @6V (%)0
- Injpwm peak time (ms) 25.5
Any suggestions on the other figures?
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).
PhatBob's UserGuide states that 6.8ohm/50W power resistors yielded good results on 'Delphi 1000cc injectors'. This leads me to believe that they were using the same injectors as I intend to.
6.8ohm/50w resistor, $3.57: http://www.newark.com/26M4936/passives/product.us0?sku=WELWYN-WH50-6R8JI
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.