Which turbo for a 5.3- GT42-76 or Precision GTSHP PT-76 CNC Ported or PT88
02-17-2012, 09:29 AM
#1
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Which turbo for a 5.3- GT42-76 or Precision GTSHP PT-76 CNC Ported or PT88 This will be going on my 5.3 with plans of a 6.0 in the future, plan to run 15-20 pounds. Car has a 4l80e and will be 50/50 street and track driven.
These are the turbos i have seen for sale recently that might fit my bill
Precision 42-76 1.44ar housing w/ billet wheel T4
Precision GTSHP PT-76 CNC Ported with .96ar housing w/ billet wheel T4
PT88 T4 with .96ar housing
Thanks Nick
These are the turbos i have seen for sale recently that might fit my bill
Precision 42-76 1.44ar housing w/ billet wheel T4
Precision GTSHP PT-76 CNC Ported with .96ar housing w/ billet wheel T4
PT88 T4 with .96ar housing
Thanks Nick
Last edited by baggins; 02-17-2012 at 09:32 AM. Reason: update
02-17-2012, 09:58 AM
#3
I know it is not on the list, but for my little 5.3 build we settled on th Borg s480 with a 96mm 1.32 turbine. I figure if I want more I can always swap out the 80mm wheel for an 82 billet or 88mm. If it is a little laggy, a little 75 shot of n20 should get things moving. I was very tempted by the 92mm turbine as well, but for $899 new in the box for the 96mm turbine, I figured I would give it a shot.
02-17-2012, 10:24 AM
#5
In general I have always been happy with the way Borg turbos work and perform. I have not completed my build just yet, so I can not give first hand experience on the 5.3 s480 combo yet, but with a 4000 rpm converter I think it will work out just fine.
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02-17-2012, 11:35 AM
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I know it is not on the list, but for my little 5.3 build we settled on th Borg s480 with a 96mm 1.32 turbine. I figure if I want more I can always swap out the 80mm wheel for an 82 billet or 88mm. If it is a little laggy, a little 75 shot of n20 should get things moving. I was very tempted by the 92mm turbine as well, but for $899 new in the box for the 96mm turbine, I figured I would give it a shot.
even with nitrous, aren't you concerned with midrange power with that A/R and large turbine....It will definitely make the peak power but it seems like a turbo that size on a 5.3 would look like a mountain peak on the dyno...
02-17-2012, 11:44 AM
#9
I have seen same turbine size with a 91mm compressor do peak torque by 4200 rpms on a 346 motor and cross the 600 torque mark by 3500 rpms. I am hoping this smaller compressor will start making boost about the same on the 325 ci motor. I plan to rev it close to 7000 rpms. With a 4000 rpm stall, I expect it to do just fine and after start keep in the upper rpms with full spool in 2nd and 3rd.
I honestly thought about going with the 83mm turbine and 1.10 housing, as it would make it a beast on the street, but we are building this more for drag racing than street use. I still expect it to do pretty well on the street, but we will see!
I honestly thought about going with the 83mm turbine and 1.10 housing, as it would make it a beast on the street, but we are building this more for drag racing than street use. I still expect it to do pretty well on the street, but we will see!
02-17-2012, 11:50 AM
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I have seen same turbine size with a 91mm compressor do peak torque by 4200 rpms on a 346 motor and cross the 600 torque mark by 3500 rpms. I am hoping this smaller compressor will start making boost about the same on the 325 ci motor. I plan to rev it close to 7000 rpms. With a 4000 rpm stall, I expect it to do just fine and after start keep in the upper rpms with full spool in 2nd and 3rd.
I honestly thought about going with the 83mm turbine and 1.10 housing, as it would make it a beast on the street, but we are building this more for drag racing than street use. I still expect it to do pretty well on the street, but we will see!
I honestly thought about going with the 83mm turbine and 1.10 housing, as it would make it a beast on the street, but we are building this more for drag racing than street use. I still expect it to do pretty well on the street, but we will see!
oh and 80s should be fine with e85...it'll be close to if not 800RW depending on how forgiving the dyno is with the auto
02-17-2012, 11:56 AM
#11
Oh, I went with the 96mm turbine 
If I had the extra change I would have done the new 92mm, but doing all this on a budget. Its a big swap...converting my wrx from 4 cylinder awd manual to 8 cylinder rwd automatic. Everything in the car has to be custom done.
If I had the extra change I would have done the new 92mm, but doing all this on a budget. Its a big swap...converting my wrx from 4 cylinder awd manual to 8 cylinder rwd automatic. Everything in the car has to be custom done.
02-17-2012, 12:03 PM
#12
I have seen same turbine size with a 91mm compressor do peak torque by 4200 rpms on a 346 motor and cross the 600 torque mark by 3500 rpms. I am hoping this smaller compressor will start making boost about the same on the 325 ci motor. I plan to rev it close to 7000 rpms. With a 4000 rpm stall, I expect it to do just fine and after start keep in the upper rpms with full spool in 2nd and 3rd.
I honestly thought about going with the 83mm turbine and 1.10 housing, as it would make it a beast on the street, but we are building this more for drag racing than street use. I still expect it to do pretty well on the street, but we will see!
I honestly thought about going with the 83mm turbine and 1.10 housing, as it would make it a beast on the street, but we are building this more for drag racing than street use. I still expect it to do pretty well on the street, but we will see!
02-17-2012, 01:34 PM
#14
370ci motor. We are not sure what the backpressure is going to look like. That is our main concern. On the diesels they have been making stupid amounts of power, but gas is a different world and we have never recommended them but some customers like to try stuff. It maybe a homerun and it maybe a dud. On the diesels, turned out to be a homerun, but diesels are a different animal and need some backpressure to stay on top of a charger somewhat.
06-14-2012, 11:25 AM
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This will be going on my 5.3 with plans of a 6.0 in the future, plan to run 15-20 pounds. Car has a 4l80e and will be 50/50 street and track driven.
These are the turbos i have seen for sale recently that might fit my bill
Precision 42-76 1.44ar housing w/ billet wheel T4
Precision GTSHP PT-76 CNC Ported with .96ar housing w/ billet wheel T4
PT88 T4 with .96ar housing
Thanks Nick
These are the turbos i have seen for sale recently that might fit my bill
Precision 42-76 1.44ar housing w/ billet wheel T4
Precision GTSHP PT-76 CNC Ported with .96ar housing w/ billet wheel T4
PT88 T4 with .96ar housing
Thanks Nick
