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2007 classic silverado flex fuel system

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Old 12-15-2018, 10:36 AM
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Default 2007 classic silverado flex fuel system
2007 classic Silverado 5.3 with factory flex fuel system, how much power can these fuel system support before something needs upgrading? ive heard they will support a round 500RWHP before anything needs upgrading?
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Old 12-15-2018, 10:48 AM
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That's what I hear as well.
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Old 12-15-2018, 10:51 AM
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Originally Posted by arthursc2
That's what I hear as well.
Do you know of anybody pushing the stock flex fuel system this far ?
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Old 12-15-2018, 06:02 PM
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Me, but in an 02
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Old 12-15-2018, 06:07 PM
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The factory injectors won't go that far because they are small but they say the fuel pump can handle it.

For sure the later NNBS trucks with flex fuel can, those pumps flow a lot of fuel.
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Old 12-15-2018, 06:08 PM
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Default stock fuel
Originally Posted by arthursc2
Me, but in an 02
How much power have you gotten out of the stock fuel system and are you boosted ?
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Old 12-15-2018, 06:16 PM
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Yes, and this round hasn't been on the dyno. Made 477 before, with a 255. 255 died, put in an OE flex fuel pump. IDC still at 98% with 52lb injectors, so it's flowing as well as my 255 was when the 255 was dyno'd

in summary, it's making at least 477whp with 12lbs
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