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Old Feb 21, 2010 | 11:07 PM
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what size injectors did the 1999 ls1's come with??
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Old Feb 21, 2010 | 11:25 PM
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99-00 cars had 26lb injectors.
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Old Feb 21, 2010 | 11:29 PM
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Originally Posted by km346
99-00 cars had 26lb injectors.
i have a set of new 28lb oem injectors,can i run these without a tune?
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Old Feb 22, 2010 | 12:43 AM
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I'm sure you could run them but the computer would think you have 26 lb injectors and you would not be getting proper fueling. I obtained a set of 28's and plan on putting them in my car, I have HP Tuners also and compared the two injector tables in the computer for the 99-2000 26lb'ers and the 01-02 28 lb'ers and they are different. If I were you I wouldnt put them in unless you get the correct table tuned in.

Last edited by Mart00SS; Feb 22, 2010 at 12:57 AM.
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Old Feb 22, 2010 | 12:50 AM
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I thought the 98s injectors are higher than 28?
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Old Feb 22, 2010 | 10:49 AM
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Originally Posted by 1badblkz
I thought the 98s injectors are higher than 28?
98 and 01-02 cars had 28lbs injectors, 99-00 cars got the 26s. GM did use two different PN's for the 28lbrs. FWIW the 98 injectors where PN 12554271 and the 01-02's should be 12561462. From what i understand both PN's flow exactly the same.

to the OP I would plan on getting your car tuned if you are switching to the 28lb injectors.
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