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Old 05-03-2015, 03:15 PM   #1
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Determining injector size help

Can someone let me know if I plugged in the correct numbers for determining the correct injector size? Bsfc will be based off of e85. I'll be running e85 tune, cj intake, and a 150 shot.
(Engine HP x bsfc)/(injectors x duty cycle)=injector size#

(725 x .65)/(8 x .85)=69.3

I was thinking about getting the ford racing 60lb injectors, I couldn't imagine needing more than that. Any input will help!
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Old 05-06-2015, 11:33 AM   #2
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How about now? 😋
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Old 05-06-2015, 11:35 AM   #3
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Ask your tuner what they're comfortable with.
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Old 05-06-2015, 11:44 AM   #4
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Ford racing 60 and 80lb injectors will make your Car run like complete ****

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Old 05-06-2015, 02:56 PM   #5
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Quote:
Originally Posted by Rapinator126 View Post
Ford racing 60 and 80lb injectors will make your Car run like complete ****

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Why is that? I'm not sure if I can get myself to pay near $1000 for IDs...
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Old 05-06-2015, 03:00 PM   #6
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most tuners will only tune certain injectors that they are comfortable, and have experience, with. Aside from that, be prepared to pay for good fuel injectors, and they're not really something you want to go cheap on. Big, cheap, injectors will idle and have low load driveability like crap from poor atomization.
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Old 05-06-2015, 03:25 PM   #7
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Originally Posted by Dub9stang View Post
Why is that? I'm not sure if I can get myself to pay near $1000 for IDs...
Bc thr coyote operates on a 4 bar and the ford racing 80lb injectors only support a 3 bar.

I ran the 80lb injectors in my coyote for awhile. Iddle is not the greatest. The tunner can get in there and do his best but, you can't change what the injector is capable of the coyote is just way to high pressure of a fuel system at iddle for a 3 bar to function properly.

**** the FR 60lb are the same thing

Get the id1000's or the DW 95's.

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Old 05-06-2015, 03:30 PM   #8
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But I have a set of 80lb If you want them $200 shipped

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Old 05-06-2015, 05:14 PM   #9
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I was not aware of that. I'll probably just run 47# with the e85 tune then after I get the cj manifold prior to spray I'll upgrade the injectors and do it right. Still deciding on a tuner. Thanks for the info, I'll pass on the 80#
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Old 05-06-2015, 07:25 PM   #10
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wait, the nitrous is a wet shot right? It will supplement its own fuel requirements, you'll only need the 47s for E85 ...
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Old 05-06-2015, 07:37 PM   #11
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Yes it's a wet plate system, but I will also be running the cj intake manifold, LTH, and off road x on top of the e85 tune. Also boost a pump. I just figured with the amount of power the car will be making it would require larger injectors, at least according to that formula. I didn't know how to incorporate the boost a pump into a factor. I'm only driving the car about 500 miles a year, but I would still like reliability and a nice smooth idle.
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Old 05-06-2015, 07:46 PM   #12
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Yes, but you're double dipping. You're counting the nitrous for the horsepower, but not taking into account that a wetshot is (can be) jetted for its own fueling needs. You only need to base your fuel injector needs off the all motor power, which will be like ... 450-460 whp on E85, which is well within the 47# injector range.
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Old 05-06-2015, 09:13 PM   #13
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Quote:
Originally Posted by Voltwings View Post
Yes, but you're double dipping. You're counting the nitrous for the horsepower, but not taking into account that a wetshot is (can be) jetted for its own fueling needs. You only need to base your fuel injector needs off the all motor power, which will be like ... 450-460 whp on E85, which is well within the 47# injector range.

Wow don't know how I didn't catch that. Makes sense lol You sir just saved me quite a bit of money, thanks for the info. So would the ford racing ones be out of question? Not sure what the best options are for that size
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Old 05-07-2015, 11:36 AM   #14
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Ok did more research, FR 47# is fine. Obviously going with the uscar connector, just not 100% if I should go with the ev6 or ev14. Is one a plug and play and the other one i need an adapter? Couldn't find any solid answers for which works best with the coyote, or if it wouldn't make a difference
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