LS Power!! Twin 76mm Turbo 4.8L 1200HP & still going!! - PerformanceTrucks.net Forums



LS Power!! Twin 76mm Turbo 4.8L 1200HP & still going!!

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Old 07-18-2011, 09:58 PM   #1
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Default LS Power!! Twin 76mm Turbo 4.8L 1200HP & still going!!

Info is from a local forum:

Quote:
Originally Posted by s14.5gonewide View Post





so to all you lsx boys.. stop bottle feeding and start force feeding..
the article below
594HP 5.3L Gen III Small Block for $3,252 - Hot Rod Magazine

the skinny
Heres the skinny:

The goal of the test was to test the true limits of the LM7, which is the 5.3L truck engine based on the LSx series engines. Pretty much an LS1 with an iron block in a nutshell.

They picked up what they thought was an 5.3L LM7 but, as they found out after the testing was over, it was actually a 4.8L LR4 which is the smallest of the LSx based iron truck engines. One phenomenal part about the engine was the #8 cylinder had a large rust spot etched in it that their hone wouldn't remove....they left it there.

For the top end they upgraded to 2" intake valves, stock exhaust valves and did a very mild port job on the heads. Flow numbers went from 220/220 to 300/220 cfm on the intake and exhaust respectively. ARP studs with Fel-Pro MLS gaskets kept the heads down. A mild Comp Cams cam was installed along with the supplied lifters, pushrods, springs and rockers remained stock. A FAST LSXR intake was installed as well with a big TB.

The short block(except the cam) was all stock. Even the original bearings and rings that were on the motor when it was purchased were reused. They even sanded the rust off the #8 rings and reused them!

Fueling was handled by 75 lbs/hr injectors and upgraded fuel rails. It was run on Rockett 118.

The two turbochargers were CXracing 76mm units run off of flipped shorty truck headers(no name brand headers).

The engine was run for SIXTY dyno pulls over half of which were claimed to be at 1000+ hp. In it's final trim, in between 26 and 27psi, the engine produced just over 1200hp. What stopped the testing was not engine failure but an ignition failure(all sensors and electrical components like the ignition were stock). The engine was 100% a-ok by the end of the testing.
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Old 07-18-2011, 10:15 PM   #2
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That is awesome!!!

I know you want to do that to your 4.8!!! DO ITTTT!!!!
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Old 07-18-2011, 10:23 PM   #3
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wow.thats badass and i take it they still didn't find the breaking point?
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Old 07-18-2011, 10:25 PM   #4
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Quote:
Originally Posted by black00chev View Post
That is awesome!!!

I know you want to do that to your 4.8!!! DO ITTTT!!!!
don't tease him.he will have it on 25psi next time at track.lol
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Old 07-18-2011, 10:28 PM   #5
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I'll stick by what I've said a handful of times that..."The 4.8l is capable of making the most power from a stock shortblock."Jus plain amazing imo...Thanks,Hotrod
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Old 07-18-2011, 10:29 PM   #6
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Hmmmmmm.... Well I did swap to a new boost gauge, old one only went to 15, new one goes to 30... hmm
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Old 07-18-2011, 10:37 PM   #7
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Time to turn it up a bit.
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Old 07-18-2011, 10:41 PM   #8
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I need a turbo
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Old 07-18-2011, 10:44 PM   #9
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Quote:
Originally Posted by SincalT/A View Post
I'll stick by what I've said a handful of times that..."The 4.8l is capable of making the most power from a stock shortblock."Jus plain amazing imo...Thanks,Hotrod
Im gonna safely assume that this holds true due to having the thickest cylinder walls.



Do it foose... at least see what that single 76 can turn out! Im sure it could handle a pass or two at 20psi lol.
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Old 07-18-2011, 10:56 PM   #10
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5.3 and 4.8 have same thickness walls.....right?
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