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Old 02-09-2009, 06:22 PM   #1
82ndsnpr
 
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need twins in a week II

i have the bullet going with the brother. is there anyway to get alittle more air out of the bullet or the brother we are trying for 900hp on fuel only. what is the flow rate of the s4t big bro compaired to a s488 or gt47 from garrett. hope to hear back soon as i will be laying out the cash in the next week or so waiting on uncle sam to pay up.
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Old 02-09-2009, 06:31 PM   #2
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with your silver, stg3, cam, and stix how does it run now? do you have alot of lag? No smarty? any numbers on current set up
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Old 02-09-2009, 07:10 PM   #3
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runs fine little lag not to bad no numbers the truck is down. will be going to smarty as soon as the turbo and kit is built and shipped still waiting on price from nathan. no need for info on big brother guys we are going with the gt47 from mpi.
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Old 02-09-2009, 07:25 PM   #4
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I think that you are going to need bigger injectors to acheive those numbers.. just my thought

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Old 02-09-2009, 07:31 PM   #5
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from another forum:

A Big Brother is actually a S4T not a S400. So the 75 and 80mm wheels mentioned above dont pertain. The standard S4T is 88mm and flows 120lbs/min. The modified version is up in the 90mm range but I don't know exactly. Most of the S4T compressors don't flow all that well for their size. BTW for those that don't know....Ken Diaz from Turbo Auto Diesel coined the Big Brother name for the S4T well before II. I ran one in my '02 in 2003 and it was LAGGY.

hope this helps
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Old 02-10-2009, 01:29 AM   #6
82ndsnpr
 
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yea it is going to be to laggy so we are going with the gt4718r
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Old 02-10-2009, 09:19 AM   #7
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I don't have the R version, but I like my journal bearing Gt4718. I went with the 1.08 housing for now.
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Old 02-10-2009, 11:06 AM   #8
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Quote:
Originally Posted by WUnderwood View Post
from another forum:

A Big Brother is actually a S4T not a S400. So the 75 and 80mm wheels mentioned above dont pertain. The standard S4T is 88mm and flows 120lbs/min. The modified version is up in the 90mm range but I don't know exactly. Most of the S4T compressors don't flow all that well for their size. BTW for those that don't know....Ken Diaz from Turbo Auto Diesel coined the Big Brother name for the S4T well before II. I ran one in my '02 in 2003 and it was LAGGY.

hope this helps
88mm wheel and it only flows 120lbs/min? Thought it would have been more.
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Old 02-10-2009, 12:11 PM   #9
82ndsnpr
 
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120lbs is what i have been told for the brother but it is way laggy we are going with a hybrid setup dumping the bullet also
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Old 02-10-2009, 01:38 PM   #10
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Quote:
Originally Posted by 82ndsnpr View Post
120lbs is what i have been told for the brother but it is way laggy we are going with a hybrid setup dumping the bullet also
So whats the new setup going to be? Both garrett turbos?
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Old 02-10-2009, 03:21 PM   #11
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4049r hybrid and gt4718r is the way its looking. with some external wastegates for the laughing gas and a few other mods in the turbo setups
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