So 10psi is max on a stock engine...
05-16-2007 | 04:56 PM
#11
TECH Resident
Joined: Jun 2005
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From: O-G'ville, SC
Originally Posted by CHEVRACER83
BETTER YET.... GET 20 PSI BY RUNNING TURBO INTO SUPERCHARGER 
TWINCHARGED BABY
TWINCHARGED BABY
05-16-2007 | 05:20 PM
#12
TECH Senior Member
Joined: Jul 2006
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From: Somewhere around -199C
Originally Posted by ColtSteele
I with ya- if you're gonna blow it up, blow it up big!! But IMO, 12, 15 or 20psi, dead on tune or not, I'd save my money for the forged motor you'll soon be needing.
+1 YOULLE DEFINITELY NEED A FORGED MOTOR.... ALONG WITH A NON 60E TRANS
BUT I STILL WANNA SEE A TWIN CHARGED TRUCK
05-16-2007 | 05:42 PM
#13
TECH Veteran
Joined: Sep 2003
Posts: 4,534
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From: Las Vegas, NV
A friend of mine was running 14psi with his 112 Radix on his 5.3L. It took a 2.70" pulley to do so and was doing a great job of making hot air, but it survived fine. This is a Joe Gibbs version at that. He has since swapped to a 6.0L, but the 5.3L was still running fine.
05-16-2007 | 10:52 PM
#15
I hate it when the "how many psi" questions come up. Its not a function of psi, but of proper tuning, fueling, power output and rpms.
One really poor designed setup can make 20psi yet yield only 400hp, while another only reads 12psi and tops 600hp. Which one is stressing motor more?
One really poor designed setup can make 20psi yet yield only 400hp, while another only reads 12psi and tops 600hp. Which one is stressing motor more?
05-17-2007 | 08:42 AM
#17
Thread Starter
On The Tree
Joined: Feb 2006
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Ok back to topic,
I got an aswer to my question, what gives in first if you up the boost to much in a stock 5,3 engine. Thanks for the picture!
The pistons are failing due to combustion pressure, and not due to pinging/knock.
//
I got an aswer to my question, what gives in first if you up the boost to much in a stock 5,3 engine. Thanks for the picture!
The pistons are failing due to combustion pressure, and not due to pinging/knock.
//
05-17-2007 | 10:07 AM
#18
TECH Veteran
Joined: Sep 2003
Posts: 4,534
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From: Las Vegas, NV
Originally Posted by BigTex
I hate it when the "how many psi" questions come up. Its not a function of psi, but of proper tuning, fueling, power output and rpms.
One really poor designed setup can make 20psi yet yield only 400hp, while another only reads 12psi and tops 600hp. Which one is stressing motor more?
One really poor designed setup can make 20psi yet yield only 400hp, while another only reads 12psi and tops 600hp. Which one is stressing motor more?
I agree with that 100%. Cylinder pressure is more important than intake manifold pressure.
05-17-2007 | 10:25 AM
#20
Launching!
Joined: Jan 2006
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Originally Posted by vanillagorilla
You can run more than 10psi, but do it on a daily basis with 10-15000 miles a year and expect problems. The two vehicles mentioned above are not driven daily, and I think that's an important factor when saying if it'll live or not. Seeing 20psi daily is a lot more taxing than once a week or twice a month.
Either way, your tune has to be dead on ***** accurate.
Either way, your tune has to be dead on ***** accurate.
I might have to disagree with that. I have been running 13 psi without an intercooler and a Snow Meth Kit since September of 2005 in a 6000# shoebox. I drive my Av every single day, pull my 6000# boat, and have a 4' x 4' bedbox I take to plant shut downs out of state. I tune with HP Tuners and take great care in watching my AFR. BTW, I run 23* timing at WOT and pull 0-60mph times in the 5 second range in a 4wd lead sled.
All of this on a stock bottom end, .589" lift, and stage 2 heads.... 500+ rwhp..
The secret to running boost is the tune......