Fueling & Injection Fuel Pumps | Injectors | Rails | Regulators | Tanks

Is running out of injector that bad?

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Old May 17, 2007 | 12:24 PM
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Default Is running out of injector that bad?

My cam only car with 26lb. injectors maxes out injector duty (100% duty) at 5600rpm. With my TR230 it would be optimal to shift at 6500rpm. At that point (6500) my car is at a 13.9 A/F ratio with a 115% injector duty. To me that looks a little too lean for my tastes. Is there really any risk running the car like that or am I ok? A friend ran this exact set up in his car for 3 years with no problems but of course all cars are different. Plus my injectors have 127k miles on them if that means anything.
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Old May 17, 2007 | 12:55 PM
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all cars are different along with the same fact being for every product being different.

if a human made it... at some point its either broke, going to break, has already broken, or is damn sure on its way to breaking.

honestly, i would just invest in some bigger injectors. some 3x#ers or so would do you fine. 13.9 is LEAN.... you could make more power i would think if you would richen it up a little. my car made the most power at 13.4 (when i was N/A)...and again, all cars are different but things do happen.

the way i see it, buy some injectors, it won't hurt you and you could only possibly gain power and stability. Also IF you do buy injectors, get DISC style not the pintle.
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Old May 18, 2007 | 12:03 PM
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Anyone else have an opinion?
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Old May 18, 2007 | 08:03 PM
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Lean mixtures can result in high cylinder temps and detonation.

Buy some injectors before you need to buy internal engine parts.
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Old May 18, 2007 | 11:07 PM
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+1 to above, you can slow down a bigger injector within reasonable limits, but one you max out an injector its time to upgrade, it is my understanding that you shouldn't have to run a injecter above 80-85 % of its max duty cycle.
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Old May 19, 2007 | 12:18 AM
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That's bad. Sounds like you need a fuel system too. Anything that leans out will hurt your engine.
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Old May 19, 2007 | 12:50 AM
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kind of odd, i wouldn't think that you would run out of fuel that fast w/ your mods. Change the fuel filter first, and see if things change. Mabye you're not getting enough flow if it's clogged.
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Old May 19, 2007 | 12:25 PM
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I'm thinking that my injectors may also be dirty from 127k miles of use. I have changed the fuel filter before about 30k miles ago lol.
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Old May 19, 2007 | 04:33 PM
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i say give it a shot, and change the filter again. cheapest thing to do first!
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