Engine, Intake, Exhaust Modifications to your Normally Aspirated Hyundai engine. Cold Air Intakes, Spark Plugs/wires, Cat back Exhaust...etc.

What Size Injectors Should I Use?

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Old Mar 30, 2006 | 02:04 PM
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After installing the CAI and exhaust (straight pipe, no cat), I think my tib is running too lean. I'm not sure which injectors to buy. Can anybody tell me which are best with current setup? What about after I finish installing the 13:1 pistons?
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Old Mar 30, 2006 | 02:10 PM
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There is no way you are running lean with those N/A mods. How do you figure your car "feels" lean. Did you check your plugs? Check your exhaust? Any CEL (injectors reached max duty cycle) etc.

BTW, at least put a cat on there... we all breathe the same air... why polute it for the rest of us. You can get high flow cats for cheap, not to mention its illegal to run without a cat in the US.
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Old Mar 31, 2006 | 11:36 AM
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I only have 1 o2 sensor plugged in right now, because of the lack of a cat. I should have the cat next week. I just couldn't wait. Will the ECU lean out the air/fuel mix by entering a "safe" mode if there is no input from one of the 02 sensors? I'm not very familiar with the ECU yet.
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Old Mar 31, 2006 | 12:00 PM
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I never saw a change with my wideband.

Do you want to buy an O2 sensor illiminator? I've got one that I never used.
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Old Mar 31, 2006 | 12:30 PM
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stock injectors will be fine with all bolt-on n/a mods, so don't worry about it.
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Old Mar 31, 2006 | 01:05 PM
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QUOTE (schlick @ Mar 31 2006, 01:36 PM)
Will the ECU lean out the air/fuel mix by entering a "safe" mode if there is no input from one of the 02 sensors? I'm not very familiar with the ECU yet.


ECU's will dump more gas (run rich) when entering "limp mode". Its safer to dump more gas than it is to run lean.
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Old Mar 31, 2006 | 11:38 PM
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You are in safe mod only when ECU throws a CEL.
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Old Apr 1, 2006 | 12:13 AM
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I know some cars do, but i dont think our ecu's go into a limp mode because of the 2nd cat CEL. I was running without an exhaust for a while, just turbo and dump tube and it ran fine. Got an exhuast and a magnaflow cat in but didnt plug the 02 sensor in, still ran fine. Finally hooked up my 02 simulator (didnt want to get 02 bung into exhuast) and it still runs fine. CEL went away, no difference in driving. Boosted the same under all situations.

Do you feel a loss of power? if so let us know what happens
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Old Sep 15, 2006 | 05:51 AM
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QUOTE (Dmitry @ Mar 31 2006, 09:30 PM)
stock injectors will be fine with all bolt-on n/a mods, so don't worry about it.


So does that apply to these mods?

11:1 pistons
272° cams
Gas flowed head
Ported intake and exhaust ports
50HP nitrous shot
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Old Sep 15, 2006 | 07:04 AM
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well if your using a wet kit the nitrous wont matter

so yes stock injectors will work fine
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