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HEADS/CAM AND 26LB. INJECTORS

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Old May 5, 2003 | 03:53 PM
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JaSSon's Avatar
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Default HEADS/CAM AND 26LB. INJECTORS

Im fixin to put tr224 in car over t1. i will be doing heads by winter. will the 26s handle this? i have had any problems so far with current setup.mods in sig. thanks for any info you can give me. jason
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Old May 5, 2003 | 06:03 PM
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VTtransam's Avatar
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Default Re: HEADS/CAM AND 26LB. INJECTORS

I posted about this a couple weeks ago, I think with the 26lb/hr injectors you will be pushing the duty cycle over 100% at higher rpm's. I'm in the same boat you are, I just bought a set of LS6 injectors which are 28.8lb/hr and I'm going to be installing them. They are generally good to about 450rwhp. If I were you I'd atleast upgrade to some '98, 2001, 2002, or LS6 injectors, all are 28.8lb/hr.
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Old May 7, 2003 | 01:45 PM
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Default Re: HEADS/CAM AND 26LB. INJECTORS

Are these good-to-go or do they require tuning your PCM?
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Old May 7, 2003 | 08:38 PM
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red ws6 99's Avatar
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Default Re: HEADS/CAM AND 26LB. INJECTORS

Go to www.rceng.com they have an online injector constant. You will see the 26.4 lb injectors are rated at 58 psig or 22.9 lb at 43.5 psig are not good much past stock and that is at 100% duty cycle. If you use a conservative .5 on bsfc you get the 26.4 lb injectors are rated at 340 fwhp at 80% duty cycle (maximum recommended by any injector manufacturer). If you go to 100% duty cycle you are up to 425 fwhp. If you use a less conservative or just unrealistic .45 bsfc and 100% duty cycle you could get 470 fwhp. The computer could probably learn to the 28 lb injectors at idle, but the WOT will probably be a little rich.

Gary
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Old May 7, 2003 | 08:56 PM
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Chris99WS6PWTMET's Avatar
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Default Re: HEADS/CAM AND 26LB. INJECTORS

Are these good-to-go or do they require tuning your PCM?
You should re-do your Injector Flow Rate table and your Injector offset table with LS1 Edit, using the data numbers from the model year the 28's came out of. I have the numbers from an 01 if you need them.
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