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Whats Too Much Boost

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  #1  
Old 03-30-2010, 04:47 PM
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Default Whats Too Much Boost
whats too much boost to run on stock head stud for a 98 12 valve cummins
 
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  #2  
Old 03-30-2010, 05:00 PM
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When the head lifts you know that's too much. This number isn't set in stone. There are factors that need to be considered other than boost.
 
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Old 03-30-2010, 05:00 PM
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Upping the timing over 16-16.5* and boost is variable to which turbo.
 
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Old 03-30-2010, 06:05 PM
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welcome to diesel bombers and what kinda boost are you running now and what kinda upgrades have you done nothing in your sig to go by
 
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Old 03-30-2010, 06:07 PM
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Originally Posted by ArizonaRedneck
welcome to diesel bombers and what kinda boost are you running now and what kinda upgrades have you done nothing in your sig to go by
he doesnt know thats why hes asking gosh
 
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Old 03-30-2010, 08:10 PM
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haha. i hit 39 psi and my head hasn't lifted yet.
 
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Old 03-30-2010, 08:22 PM
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Do you WANT it to lift? hehe. No but 39psi on the stock turbo wont lift the head it will just smoke the turbo after a period of time
 
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Old 03-30-2010, 10:14 PM
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39 wont smoke the charger. 52 for 8 months will ask me how I know.
 
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Old 03-30-2010, 11:26 PM
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Originally Posted by 12valvetater
When the head lifts you know that's too much. This number isn't set in stone. There are factors that need to be considered other than boost.
like timing, rpm, and drive press

Originally Posted by 12valvetater
39 wont smoke the charger. 52 for 8 months will ask me how I know.

my stock head held 55psi @ 3,000rpm with 15.5* of timing for more than 8 months ... but that wasnt a stock turbo ( silver bullet)
 
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Old 03-31-2010, 09:42 AM
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i ran 74psi with my twins on stock hg and arp studs. no prob.
 
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