upgrading t4 turbo
Thread Starter
Launching!
Joined: Sep 2008
Posts: 273
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upgrading t4 turbo currently using a tc78 with a 1.15 a/r housing.
my manifold is a t4 flange and not looking to change it,
truck(gmc sonoma 3600lbs) went 10.82 on 10psi looking to comfortably go high 9's with a turbo upgrade and head studs and zr1 gaskets.
the two turbos im looking at are the precision pt78 and the borg warner s380.
i know the precision would get me there and is a pretty potent turbo...
would it be safe to say the S380 would be good for slightly more hp?? bigger turbine wheel ....
for some reason i really wanna try the t4 borg warner unit, i just dont wanna make the wrong move..
(its a 6.0 liter lq4)
my manifold is a t4 flange and not looking to change it,
truck(gmc sonoma 3600lbs) went 10.82 on 10psi looking to comfortably go high 9's with a turbo upgrade and head studs and zr1 gaskets.
the two turbos im looking at are the precision pt78 and the borg warner s380.
i know the precision would get me there and is a pretty potent turbo...
would it be safe to say the S380 would be good for slightly more hp?? bigger turbine wheel ....
for some reason i really wanna try the t4 borg warner unit, i just dont wanna make the wrong move..
(its a 6.0 liter lq4)
currently using a tc78 with a 1.15 a/r housing.
my manifold is a t4 flange and not looking to change it,
truck(gmc sonoma 3600lbs) went 10.82 on 10psi looking to comfortably go high 9's with a turbo upgrade and head studs and zr1 gaskets.
the two turbos im looking at are the precision pt78 and the borg warner s380.
i know the precision would get me there and is a pretty potent turbo...
would it be safe to say the S380 would be good for slightly more hp?? bigger turbine wheel ....
for some reason i really wanna try the t4 borg warner unit, i just dont wanna make the wrong move..
(its a 6.0 liter lq4)
my manifold is a t4 flange and not looking to change it,
truck(gmc sonoma 3600lbs) went 10.82 on 10psi looking to comfortably go high 9's with a turbo upgrade and head studs and zr1 gaskets.
the two turbos im looking at are the precision pt78 and the borg warner s380.
i know the precision would get me there and is a pretty potent turbo...
would it be safe to say the S380 would be good for slightly more hp?? bigger turbine wheel ....
for some reason i really wanna try the t4 borg warner unit, i just dont wanna make the wrong move..
(its a 6.0 liter lq4)
Last edited by mike13; Nov 3, 2011 at 05:49 PM.
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Thread Starter
Launching!
Joined: Sep 2008
Posts: 273
Likes: 0
Hydrostream6, how many psi did it take to get you there? and did you leave under boost? and what size downpipe? im at 3 1/2" now...
im looking to get my 3625ish lbs to a minimum of 140mph trap.
was at 128.5 with tc78 at around 10psi, no boost on launch...
im looking to get my 3625ish lbs to a minimum of 140mph trap.
was at 128.5 with tc78 at around 10psi, no boost on launch...
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Verdad Gallardo Thread Starter
Launching!
Joined: Sep 2008
Posts: 273
Likes: 0
im looking into the precision pt78 a little more closely now, because it looks like i could get it to work with my 3 1/2" downpipe with minimal re-fabbing.. where as the s380 would basically require me to re make the downpipe and id wanna step up to 4"...
Hydrostream, i see you had some great results with it..
im wondering, provided i get it to stick, if i can get this setup into the 9's / 140mph trap on the "stock" motor (rod bolts/head studs/ls9 gaskets/ls6 cam)
timeslip shown is with tc78 f1 1.15a/r on 10psi, truck shifted into overdrive at 117 (has 3.73s with 26" tire, will have 3.23s and rev/shiftpoitns raised when i go back.) and made somewheres around 13 psi once the converter locked (from 117-128) yes i was in overdrive on this 10 second pass...
looking to go 9.99 on around 15-17psi... anythoughts on whether the pt78 will get me there? another 12mph..
Hydrostream, i see you had some great results with it..
im wondering, provided i get it to stick, if i can get this setup into the 9's / 140mph trap on the "stock" motor (rod bolts/head studs/ls9 gaskets/ls6 cam)
timeslip shown is with tc78 f1 1.15a/r on 10psi, truck shifted into overdrive at 117 (has 3.73s with 26" tire, will have 3.23s and rev/shiftpoitns raised when i go back.) and made somewheres around 13 psi once the converter locked (from 117-128) yes i was in overdrive on this 10 second pass...
looking to go 9.99 on around 15-17psi... anythoughts on whether the pt78 will get me there? another 12mph..
I'm a good amount heavier than you are and I'm going mid 140s. And the turbo wasn't showing signs of dropping power yet on the dyno either, I just didn't want to push much more boost with stock heads. 140+ shouldn't be a problem at all with your setup assuming the stock lower end holds up and you can get it to hook.
Thread Starter
Launching!
Joined: Sep 2008
Posts: 273
Likes: 0
yea my downpipe now is 3" v band with a 3" to 3 1/2" cone to full 3 1/2" the rest of the way back.. so im sure with little modification i could get it to work.
im sure the tc78 would get me a good bit more but were putting it on a 5.3 in my buddy's 98 ss with head studs, rod bolts and cam, and that will see around 15psi..
i know it'll be the upper limits of the bottom end, but im hoping around 600-650rwhp will get me there, i was 3625 with me and gas, and itll be a little lighter in the spring, maybe 3500lbs total.
im sure the tc78 would get me a good bit more but were putting it on a 5.3 in my buddy's 98 ss with head studs, rod bolts and cam, and that will see around 15psi..
i know it'll be the upper limits of the bottom end, but im hoping around 600-650rwhp will get me there, i was 3625 with me and gas, and itll be a little lighter in the spring, maybe 3500lbs total.
