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To Boost or not to Boost

ideas on if i should keep my current truck and boost it or not

Re: To Boost or not to Boost

Postby zacharyh687 [OP] » Feb 19 2013, 5:28pm

A stock 4.8 the book says it puts out 305 at the crank add 7-8psi to it that should net me in the ballpark of 400+ hp at the crank but if i where to s/c the 4.8 i would also cam it and find a cam that will work well in the 4.8 and the boost and that will wake it up even more and it is not that expensive for the cam up grade and i think if i where to add boost that would be the right thing todo. But there are other things i have to look into also like as stated before rebuilding the trans and that with parts and labor will be 1500-2000. But i have to crunch some numbers to see if it would be a good move to sell my truck and upgrade to the 6.2l
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To Boost or not to Boost

Postby GarrettCobb » Feb 19 2013, 5:53pm

zacharyh687 wrote:A stock 4.8 the book says it puts out 305 at the crank add 7-8psi to it that should net me in the ballpark of 400+ hp at the crank but if i where to s/c the 4.8 i would also cam it and find a cam that will work well in the 4.8 and the boost and that will wake it up even more and it is not that expensive for the cam up grade and i think if i where to add boost that would be the right thing todo. But there are other things i have to look into also like as stated before rebuilding the trans and that with parts and labor will be 1500-2000. But i have to crunch some numbers to see if it would be a good move to sell my truck and upgrade to the 6.2l

Correct
Port your heads while you are at it, and put ARP head bolts and some head gaskets while your at it.
7-8 psi is a lot for a stock ls engine.
I would try and get a good intercooler so your not running the same boost in "unintercooled" conditions.
But you are getting the same amount of air, in a denser smaller form
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Re: To Boost or not to Boost

Postby zacharyh687 [OP] » Feb 19 2013, 6:04pm

7-8 would be the max that i would want to push on a stock bottom end. I have seen one review in hot rod mag where they took a stock 4.8l put a comp cam that was off the shelf in it replaced the headgaskets with stock replacement head gaskets and added a fast ls intake 2 turbos and that motor cranked out 1200+ hp and the article said that there were 60 runs on the dyno and most of them where over 1000hp and in the 15+psi of boost.. now there is no way in hell i would do this to my truck because i know damn well that Murphy will find me. Lol
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Re: To Boost or not to Boost

Postby JCunningham » Feb 19 2013, 6:11pm

and your still going to get smoked by a 6.2l with a tune. 305 @ what 5500RPM
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To Boost or not to Boost

Postby GarrettCobb » Feb 19 2013, 7:07pm

Nahha built motors with slightly less power will always outperform stock
And it may be only at 5500 stock but with a turbo you gain loads of lower- and midrange power, as well as top end
Turbos give more torque and top end, while sacrificing low end boost.
So if you had a stall converter you would essentially eliminate the issue
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Re: To Boost or not to Boost

Postby country1911 » Feb 19 2013, 7:35pm

So basically you're spending over $10k to get similar performance as a 6.2 with a tune? Something isn't adding up to me. Why not just spring for the bigger motor and add bolt-ons to that?

Personally I would rather have the NA motor with 500ish hp than the boosted motor with the same power. I think longevity will be better with NA motor as you are only scratching the surface of its capabilities.
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To Boost or not to Boost

Postby GarrettCobb » Feb 19 2013, 9:34pm

Posches have 480hp and outrun z06 vettes and 570-600hp lambos...
How does that add up?
Power delivery, and weight is some factor but not 120hp difference
A 400hp 4.8 correctly sized turbo at around 6-8lbs of boost will out run a 6.2 with 450.
I almost guarentee it
Maybe not top end but from 0-120
Yes $$ is a factor.
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To Boost or not to Boost

Postby GarrettCobb » Feb 19 2013, 9:36pm

I get that but everything will cost money
The fact is that he already has a truck ready for whatever he feels necessary
For the 6.2 he will have to sell his, down payments blahh blahhh
All that.
Which may be cost effective but not for what he is trying to accomplish
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Re: To Boost or not to Boost

Postby zacharyh687 [OP] » Feb 19 2013, 10:00pm

I would bet a $100 that a boosted 4.8 will walk from a stock 6.2l even up in the higher rpm band because these 4.8's love to spin.

Hell i have seen 4.3l walk away from vetts and vipers. That was a 4 door 4wd s10 blazer now the s10 got its ass kicked above 120 but that is because the 4.3 stock heads can not flow enough to support the rpms but the low end on a 4.3 v6 is crazy
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To Boost or not to Boost

Postby GarrettCobb » Feb 19 2013, 11:45pm

zacharyh687 wrote:I would bet a $100 that a boosted 4.8 will walk from a stock 6.2l even up in the higher rpm band because these 4.8's love to spin.

Hell i have seen 4.3l walk away from vetts and vipers. That was a 4 door 4wd s10 blazer now the s10 got its ass kicked above 120 but that is because the 4.3 stock heads can not flow enough to support the rpms but the low end on a 4.3 v6 is crazy

I have one lol.
Also i have a 6.2
Im not putting it down, but i almost guarentee a 4.8 boosted will win
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