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How much boost will a 5.3 take

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Old 01-23-2013 | 05:06 PM
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Originally Posted by chevrolet all the way
i have a spare junk motor in my truck with what started as 250k on it. ive put over 20k miles on it at 10 psi or more. has seen over 25 psi a few times. runs at 18 usually now. 93 oct no meth 5.3
Damn 25psi! That's getting close to raising the bar, no head studs? Just a factory 5.3 with boost and cam ect
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Old 01-23-2013 | 06:02 PM
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oops i do have head studs with factory gaskets. stock rod bolts and such though

does have stock plug wires also
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Old 01-23-2013 | 06:32 PM
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lol @ rick

20 seams to be working will with some members here

check out foose04


he has a stock bottom 4.8 with 700+ to the wheels
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Old 01-23-2013 | 07:10 PM
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Ive had mine up to 14psi with no problems and plan to go much higher. But boost pressure is all relevant to the setup. Chevy all the way, what kind of timing when you were running 18 psi on pump 93 with no meth?
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Old 01-23-2013 | 08:28 PM
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Mine has been from 20-22 for a long time, i want to try it with 25
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Old 01-23-2013 | 08:42 PM
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Damn man that thing moves!! Llaverito is that a fullsize 5.3 record?
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Old 01-23-2013 | 08:47 PM
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Originally Posted by sand man
lol @ rick

20 seams to be working will with some members here

check out foose04


he has a stock bottom 4.8 with 700+ to the wheels
Yeah hes what made me want to do this. Hope to be able to run 12-15 without studs
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Old 01-23-2013 | 10:13 PM
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Originally Posted by o2camaross
Ive had mine up to 14psi with no problems and plan to go much higher. But boost pressure is all relevant to the setup. Chevy all the way, what kind of timing when you were running 18 psi on pump 93 with no meth?
yes. but for the most part any stock 5.3 will be similar air flow with boost pressure... different but not crazy different.

18psi 14.5 deg timing 11.8 afr. no knock.
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Old 01-23-2013 | 10:42 PM
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Damn!! 3 bar OS? My ecu doesn't support a 3 bar OS apparently so Im stuck with a 2 bar till I figure something out. What turbo?
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Old 01-24-2013 | 09:55 AM
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Yes 3bar. s400 75. t6 rear mount. honestly forgot which exh housing
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