jacob80 Posted March 17, 2009 Share Posted March 17, 2009 Hey guys, I've skimmed through the injector thread but cannot seem to find a high impedence barb style 440cc injector. We have a Pallnet barb style fuel rail. I'm assuming 440cc injectors will be fine with the stock turbo if we're looking for a little under 300whp. These won't be overkill, will they? And as fasr as the high impedence factor, should we use these or run resistors in the wiring with low impedence injectors (we will be using megasquirt 029y4 pcb 3.0 if this iinformation is relevant). Thanks again guys Quote Link to comment Share on other sites More sharing options...
Pyro Posted March 17, 2009 Share Posted March 17, 2009 Should use low impedance injectors. A turbo engine has a wide range of fuel delivery needs. (very little at idle and a lot at boost) So, you need to use an injector that has good control over it's entire duty cycle. And low impedance injectors have much better control at low duty cycles as compared to high impedance. high impedance works fine for non-turbo application, but you will have idle issues on a L28 if you use 440cc high impedance injectors. yes, 440cc is enough to make a 300 rwhp L28. Quote Link to comment Share on other sites More sharing options...
jacob80 Posted March 17, 2009 Author Share Posted March 17, 2009 Ok so use low impedence barb style 440cc injectors with inline resistors for use with megasquirt, correct? Quote Link to comment Share on other sites More sharing options...
jacob80 Posted March 17, 2009 Author Share Posted March 17, 2009 Additionally, I just read about the PWM (pulse width modulation) in megasquirt and found that very interesting and an alternative to inline resistors. Which would you guys recommend?? Quote Link to comment Share on other sites More sharing options...
Matt Cramer Posted March 18, 2009 Share Posted March 18, 2009 I'd probably use the PWM control first and see how well it works. You can add resistors later if you find your injectors / wiring are giving you noise problems. Unless you have a V2.2 board, in which case I'd go straight for the resistors. Quote Link to comment Share on other sites More sharing options...
jacob80 Posted March 18, 2009 Author Share Posted March 18, 2009 We have a Megasquirt 1 with PCB 3.0.....how do I know if I have 2.2 or not? Quote Link to comment Share on other sites More sharing options...
Matt Cramer Posted March 19, 2009 Share Posted March 19, 2009 We have a Megasquirt 1 with PCB 3.0.....how do I know if I have 2.2 or not? You just answered your own question: You have a 3.0, not a 2.2. Quote Link to comment Share on other sites More sharing options...
jacob80 Posted March 19, 2009 Author Share Posted March 19, 2009 Alright so here is what I have learned. First, use low impedence injectors and wire them without the resistors initially, and use the PWM. I have decided on 1988 Ford Thunderbird Sport Injectors, which are low impedence 370cc barb style injectors. Does this sound correct? We are using the stock intake manifold with pallnet fuel rail and stock brackets to hold the injectors in. Will a Walbro 255lph pump be fine for this application? Quote Link to comment Share on other sites More sharing options...
JustinOlson Posted March 19, 2009 Share Posted March 19, 2009 If you could get away from the barb style injectors, you'd be well served to try the newer Bosch EV14 injectors. They have the best response and spray pattern on the market. Quote Link to comment Share on other sites More sharing options...
cygnusx1 Posted March 19, 2009 Share Posted March 19, 2009 FWIW I use Ford Lightning High Impedance 440cc/42lb injectors and my car idles fine. L28ET with around 300hp or more. MSII, Walbro 255l, and PWM-off. Quote Link to comment Share on other sites More sharing options...
jacob80 Posted March 19, 2009 Author Share Posted March 19, 2009 We actually just acquired a pallnet barb style fuel rail, so barb is the way we're going to go. We are going to use the 1988 Ford Thunderbird 370cc injectors (barb style) with a Walbro 255lph pump with the stock 240z tank and lines (someone in my other thread siad they run this setup fine) and hope to install a surge tank later. Give me your input, thanks! Quote Link to comment Share on other sites More sharing options...
WizardBlack Posted March 28, 2009 Share Posted March 28, 2009 I have 560's and use PWM on my MS. No problems with 800 rpm idle. It runs closed loop at stoich. Quote Link to comment Share on other sites More sharing options...
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