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what size turbo for twin 4.8 turbo

Old 11-15-2015, 07:40 AM
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Default what size turbo for twin 4.8 turbo

I've got a 2013 4.8 (L20) I am using for my twin turbo build. The L20 comes with 243 heads and has 8.8 compression ratio. I think I have decided to use the ls9 cam. This build is pure street car, 78 4dr Fairmont, TH350 (550-600 RWHP maybe). I need some help picking out proper size turbos for my twin setup.

Maybe this is a possible candidate?:

http://www.ebay.com/itm/T04E-T3-T4-6...BV3AbE&vxp=mtr
Old 11-15-2015, 08:12 AM
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My opinion twin 50's are a bit small. I'd go with 60's at least
Old 11-15-2015, 01:11 PM
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Dont see why those wouldnt work. For all they cost anyway, it wouldnt be the end of the world if you needed to change.
Old 11-15-2015, 02:05 PM
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I run those. Only 9 passes so far. 5.93 @ 118 mph
at 8lbs of boost.

So far so good.

Build thread

https://ls1tech.com/forums/forced-induction/1797340-i-am-having-twins.html

Last edited by T.Fiddler; 11-15-2015 at 02:12 PM.
Old 11-17-2015, 06:38 PM
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Can always add a 3rd or 4th for that price too! Buddy picked up 3 of them to try on his 5.3.

Originally Posted by T.Fiddler
I run those. Only 9 passes so far. 5.93 @ 118 mph
at 8lbs of boost.

So far so good.

Build thread

https://ls1tech.com/forums/forced-in...ing-twins.html
Don't get the fellas hopes up! I doubt many would run anywhere near the same times as you in that feather weight chassis!
Old 11-17-2015, 08:48 PM
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Originally Posted by Forcefed86
Can always add a 3rd or 4th for that price too! Buddy picked up 3 of them to try on his 5.3.



Don't get the fellas hopes up! I doubt many would run anywhere near the same times as you in that feather weight chassis!
Exactly! I was wondering if anyone was going to post this. Lol
Old 11-18-2015, 01:38 AM
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Shhhhhhhh.......lol
Old 11-18-2015, 02:11 PM
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I have two of these on my 4.8 silverado. i havent pushed any real boost yet but they seem like theyre going to be pretty responsive once i turn up the boost controller.

with 3psi wastegates on spring pressure only it goes positive at like 2800 rpm with the stock converter. i have a 3400 converter going in and i expect its going to be instant boost with that.

http://www.ebay.com/itm/CXRacing-T4-...RS2egM&vxp=mtr


Old 11-18-2015, 02:24 PM
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Not a bad choice for budget turbos, but I would seriously think about doing a different cam. Even for a budget build, it is not too much more to even buy a shelf cam from many of our reputable vendors.
Old 11-19-2015, 01:16 PM
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Do a 3 fer...



Old 11-19-2015, 03:44 PM
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Originally Posted by Forcefed86
Do a 3 fer...



what setup is that?

Garrett
Old 11-19-2015, 06:18 PM
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Originally Posted by SSpeeDEMONSS
what setup is that?

Garrett
Mock up on a friends car. Same $130 turbos as listed able. Plans to run 3 of them off a log.
Old 11-19-2015, 08:36 PM
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Originally Posted by Forcefed86
Mock up on a friends car. Same $130 turbos as listed able. Plans to run 3 of them off a log.
Can't wait to see how that works. Sounds like a cool setup!
Old 11-23-2015, 07:35 PM
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Originally Posted by TrendSetter
I have two of these on my 4.8 silverado. i havent pushed any real boost yet but they seem like theyre going to be pretty responsive once i turn up the boost controller.

with 3psi wastegates on spring pressure only it goes positive at like 2800 rpm with the stock converter. i have a 3400 converter going in and i expect its going to be instant boost with that.

http://www.ebay.com/itm/CXRacing-T4-...RS2egM&vxp=mtr



I am thinking of getting these for my next build. I see they are water and oil cooled. How are you plumming the water to the turbos?

Thanks
Old 12-01-2015, 12:10 PM
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As denmah puts it, 'theres no need to water them, they wont grow'
Old 12-01-2015, 05:31 PM
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I've got turbonetics 6665's for mine.


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