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need help !! Fuel injector question

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Old Aug 22, 2013 | 04:22 PM
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Default need help !! Fuel injector question

hey guys i need some help a few weeks ago i bought these bbk fuel rails and ended up breaking the flange on four fuel injectors so ive been looking for a set of used one and came across these 28lb/hr ones that i ended up buying now my question is :

I have a 2000 ss which came with the 26lb/hr injectors if i run these 28s would i need to retune my car to run them and what could happen if i do run them
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Old Aug 22, 2013 | 05:44 PM
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shouldve just bought 26lb/hr or all 28lb/hr. the 28s will run more fuel the engine wont be right
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Old Aug 22, 2013 | 05:47 PM
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well i bought a set of 8 , 28s because i couldnt find the 26s once i paid for the 28s then i had gotten offered the 26s
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Old Aug 22, 2013 | 07:25 PM
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you must retune for the different injectors.if you run the 28# injectors with out a proper retune ,you will put too much fuel into the cylinder .too much fuel can wash down the cylinder walls ,hurting ring seal .
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Old Aug 22, 2013 | 11:28 PM
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doh. oops. yea if you have all 28lb/hr injectors than a retune is in order. itll run, but not as good as it could with a tune
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Old Aug 23, 2013 | 08:24 AM
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" Your fuel trims will be able to compensate, just remember that without the computer knowing the injector size, ~7% more fuel is being squirted into the cylinder with each pulse of injectors. Luckily the LTFTs and STFTs can correct up to 25% each way, however sustained LTFT values of +- 15% can set an SES light."

this is what someone told me is this true or false
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Old Aug 23, 2013 | 07:43 PM
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so i shouldnt run the 28s in the car is what your saying
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Old Aug 24, 2013 | 05:32 AM
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You can probably get the correct size injectors cheaper than a tune, but you have to have one of the two.
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Old Aug 24, 2013 | 12:27 PM
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yea a few guys on here offered me the 26s for $50 shipped so im just goin to get them and be on the safe side , can i at least install these 28s to start and move the car
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Old Aug 24, 2013 | 06:11 PM
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Originally Posted by wavebyby
yea a few guys on here offered me the 26s for $50 shipped so im just goin to get them and be on the safe side , can i at least install these 28s to start and move the car
It will run, but as said above it will not be optimal since the O2s will have to do a major adjustment just to get it running decent.
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