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Originally Posted by Weasy2k
yea my stinkin ems is saturated as well...
I was thinking about using the stock resistorpack to bring that up to high IMP...
your views?
The thing with using the N2O injection you can have similar ot stock injectors and not worry about that added cost...soo looks like i will take that route. Just gotta learn more about this.
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If you have saturated injector drivers, you likely have a current limit of ~1 amp or so. That means if your steady-state resistance in the injectors is ~12 ohms or more, then do NOT use the resistor pack. These would be high impedance injectors.
If your measured resistance across the injector terminals is more like 2-5 ohms, then you need a resistor pack wired in series to bring the total circuit resistance up to ~12 ohms.
Don't worry too much about idling big injectors with saturated drivers. Unless you are going north of 800 cc/min., you will be just fine.
You can only have similar-to-stock injectors (assuming you are talking about a dry kit) if your injectors have the headroom to handle the extra oxygen coming in.
A BSFC of ~0.55 is probably relatively safe to use. That's in pounds/hour-hp, measured at the crank. That means you take your expected crank hp divided by the # of injectors and multiply it by 0.55 to get the total per-injector flowrate in pounds/hour. To convert to cc/min., you multiply by 10.2.
The above assumes 100% duty cycle, which is obviously bad. To correct for a safe duty cycle, you take the resulting number and divide it by the max duty cycle you want to see. Most use 80%. This means you would take the above number and divide it by 0.8.
The result will be a per-injector static flowrate in cc/min. This is the minimum injector size you should use.
My BSFC figure might be off since I'm not 100% used to Nitrous. That would be the only thing to verify with a google search.