4.8 block - want more compression

ifixedit · August 4, 2015

Hot Rod did an article some time back involving slapping a cheap made over seas turbo on an LS out of a late model Silverado. They thought they had a 5.3 but turned out after further investigation they had a 4.8. They managed to wring close to 600 HP out of the little thing but spent around $4K to do it and talk about a complex project, theirs wouldn't have fit in an engine bay and was more just a test to see what they could get. You can get mid 500's to 600 HP out of a naturally aspirated 6.0 fairly easy and nothing complex.

Badass69 · August 4, 2015

Hot Rod did an article some time back involving slapping a cheap made over seas turbo on an LS out of a late model Silverado. They thought they had a 5.3 but turned out after further investigation they had a 4.8. They managed to wring close to 600 HP out of the little thing but spent around $4K to do it and talk about a complex project, theirs wouldn't have fit in an engine bay and was more just a test to see what they could get. You can get mid 500's to 600 HP out of a naturally aspirated 6.0 fairly easy and nothing complex.

They actually made over 1000 hp with that article you are referencing. Might not last forever but still. They made 600 on like 7 pounds... over 900 on 15 and then 1203 hp on like 26 pounds lol. Pretty easy to have one live on low boost and still be able to crank it up if you want it and walk any n/a setup. So what of it pops... build it or toss in another one that you can get for like a $100 lol.

http://www.hotrod.com/how-to/engine/hrdp-1109-stock-gm-ls-engine-big-bang-theory/

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BlackZ71Silverado · August 4, 2015

They actually made over 1000 hp with that article you are referencing. Might not last forever but still. They made 600 on like 7 pounds... over 900 on 15 and then 1203 hp on like 26 pounds lol. Pretty easy to have one live on low boost and still be able to crank it up if you want it and walk any n/a setup. So what of it pops... build it or toss in another one that you can get for like a $100 lol.

http://www.hotrod.com/how-to/engine/hrdp-1109-stock-gm-ls-engine-big-bang-theory/

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There would be no walking away on anything because the OEM transmission would explode with that kind of torque. With a set up like that, it's going to be big money making all of the proper upgrades.

Badass69 · August 4, 2015

There would be no walking away on anything because the OEM transmission would explode with that kind of torque. With a set up like that, it's going to be big money making all of the proper upgrades.

So what.... it's the same thing with a naturally aspirated build. The tranny and 10 bolt won't magically last longer because there is no forced induction. ...

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ifixedit · August 4, 2015

I think the 1000 HP + article came along after my subscription ran out! But now that you mention it, I do recall hearing reading about that in a later article. The stock tranny and rear end should handle 600 HP providing you aren't drag racing and doing hard launches on sticky tires. In any case asking for a reliable 1000 HP out of a stock bottom end 4.8 is getting a little out there, like way out there. The LS are pretty incredible and will take some abuse but not that kind of abuse, at least not for very long. You'd soon be looking at a few new windows in the block turned up that high. Go for the 6.0. and stay a bit more reasonable on the HP and you'd have a very fun truck to run around in and embarrass a few folks.

Something else not mentioned here yet (unless I missed it) is horsepower ratings in the old days was gross HP measured at the crank, now days it's NET HP with all accessories attached and measures at the rear of the trans. So they say 295 HP as an example, figure at the crank it's making probably another 75 HP, so these new engines are considerably more powerful than the old small blocks, and other than giving up some torque numbers are nearly rivaling the old school big blocks as well. That's why a 6.0 is the way to go, pretty easy to beat the old school engines in all respects, and you really won't be dealing with anything very radical. Probably would idle quite smoothly too and not even need a higher stall converter if you didn't want to mess with one. A cam change, a little head work, intake and exhaust would probably get you right in the ball park.

Badass69 · August 4, 2015

Meh. Ls engines are cheap. A bolt on turbo kit with the right setup on a 4.8 can easily do 500 to 600 hp and last a very long time. A heads cam intake 6 liter... will run like a piece of garbage in a truck naturally aspirated to achieve that comparitively....The turbo engine easily can idle nice and go smaller and have the boost sooner. He wants power and already has a cammed 4.8. Turbo... Done....

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BlackZ71Silverado · August 5, 2015

So what.... it's the same thing with a naturally aspirated build. The tranny and 10 bolt won't magically last longer because there is no forced induction. ...

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Yeah, you're right. The OEM drivetrain will definitely hold up under that much load, good luck with that.

Make sure you let all the performance shops know about that so they can make sure all of their customers don't waste money to upgrade their OEM drivetrain.

Apparently you know more than the guys building stronger components and transmissions to handle that kind of torque. I guess standard drivetrain components should handle at least 900hp & torque, sure, no problem there.....Genius!

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Badass69 · August 5, 2015

Yeah, you're right. The OEM parts will hold up under that much load. Make sure you let all the performance shops know so they can tell all of their customers there is no need to upgrade their OEM parts. You will save a shit ton of people a lot of money, I'm sure they will appreciate that. I guess standard drivetrain components should handle at least 900hp & torque.

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For the record I never said it would last forever making 900 hp on the stock bottom end..... but from personal experience it will last a lot longer than a lot of "pro" build engines that usually never make it out of infancy because Pedro can't build engines....

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