Best turbo to match 950rwhp with fastest spool on 408...
06-13-2007, 02:05 PM
#1
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Best turbo to match 950rwhp with fastest spool on 408... So I guess theres some play in the turbo im running now (GT55) and will be getting it sent off to garrett to look at and make sure its ok.
Few questions... I dont plan on pushing past 900-950rwhp since Im limited to that by fuel (75# inj's)...
First, what would be the best turbo with a t6 flange that would work with a 408 at about 8.5 CR, maybe a bit higher...
Second, assuming the turbo is either ok or fixed properly, what would you assume a turbo like mine (GT55) would be worth selling for?
Jose... Im looking specifically for turbo advice from you or Dr Turbo as I know you guys know your ****. Although I am open to advice from others as well
Thanks!!
Few questions... I dont plan on pushing past 900-950rwhp since Im limited to that by fuel (75# inj's)...
First, what would be the best turbo with a t6 flange that would work with a 408 at about 8.5 CR, maybe a bit higher...
Second, assuming the turbo is either ok or fixed properly, what would you assume a turbo like mine (GT55) would be worth selling for?
Jose... Im looking specifically for turbo advice from you or Dr Turbo as I know you guys know your ****. Although I am open to advice from others as well
Thanks!!
06-13-2007, 02:35 PM
#2
Well the S88 will make that power and fit in a smaller package and is more durable. The GT55 is not a great turbo for reliability. Jose explained it to us as the shaft size and stub end are the same size as a GT47, but then they added even larger wheels to an already very overly taxed shaft. So what happens is the turbo seems to gyrate around the 2 axis's which are the front and rear journal bearings. That is why you see so many GT55's with problems. If they upped the shaft size they would be much stronger unit. Don't get me wrong though its still a nice charger, but an S88 will make those #'s and live a long time.
06-13-2007, 03:13 PM
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Originally Posted by DrTurbo
Well the S88 will make that power and fit in a smaller package and is more durable. The GT55 is not a great turbo for reliability. Jose explained it to us as the shaft size and stub end are the same size as a GT47, but then they added even larger wheels to an already very overly taxed shaft. So what happens is the turbo seems to gyrate around the 2 axis's which are the front and rear journal bearings. That is why you see so many GT55's with problems. If they upped the shaft size they would be much stronger unit. Don't get me wrong though its still a nice charger, but an S88 will make those #'s and live a long time.
Wouldnt an S88 be overkill for 950rwhp? I thought an S80 or S85 would suffice while making better spool?
06-13-2007, 03:14 PM
#4
Originally Posted by 2000 Tran Zam
The turbo has been great to me so far, the only reason I asked this is because its so big and close tot he radiator, and is overkill for the power that I will be staying at.
Wouldnt an S88 be overkill for 950rwhp? I thought an S80 or S85 would suffice while making better spool?
Wouldnt an S88 be overkill for 950rwhp? I thought an S80 or S85 would suffice while making better spool?
06-13-2007, 03:21 PM
#5
Its not really about pushing it harder, its just run "X" amount of boost on the smaller one to make the horsepower goal...
An S80 at 18-20 psi on a well done 408 will make the power. I think a s76 would possibly make it as well and spool crazy fast.
An S80 at 18-20 psi on a well done 408 will make the power. I think a s76 would possibly make it as well and spool crazy fast.
06-13-2007, 03:25 PM
#6
s88 will do that at 20 psi for sure. I am using a 1.32 a/r housing and it is not immediate spool but it is so worth the top end...actually has made it easier to keep traction since it doesnt hit so hard in the first 60' like my incons did. Dont rule out that big housing as an option...I have a 408 as well. Do a search for "OFI" in the topics and you will see my posts with videos
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06-13-2007, 03:32 PM
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Originally Posted by cablebandit
s88 will do that at 20 psi for sure. I am using a 1.32 a/r housing and it is not immediate spool but it is so worth the top end...actually has made it easier to keep traction since it doesnt hit so hard in the first 60' like my incons did. Dont rule out that big housing as an option...I have a 408 as well. Do a search for "OFI" in the topics and you will see my posts with videos
06-13-2007, 03:38 PM
#10
Originally Posted by 2000 Tran Zam
ya I made 933rwhp on 16 lbs with the gt55, so Id assume the S88 should be around the same if its as efficient as its saying...
.
06-13-2007, 03:49 PM
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Originally Posted by DrTurbo
The S88 even though smaller will make big power due to the ETT wheel. But its still only an 88mm versus a 91mm and its also in the smaller housing size of a GT42 style and not the BIG GT55 housings.
I just want something smaller so I have more room between the radiator and turbo so I could put a blanket on the turbo and stock fan shroud back on the radiator.
06-13-2007, 03:52 PM
#12
Well the S85 and S88 are the same size. As for power, yes they will support that no problem. The S80 can be made with different housings so we can adapt an even smaller comp cover.
06-13-2007, 04:17 PM
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and the S80, 85 and 88 can be made with a t6 too right? I just wanna spend as little as possible to just meet my limits without pushing things too hard cause I want it to last.
what would you say would be a good asking price for the gt55 with less then 3k miles on it? I think I saw a new one for sale for 3300....
what would you say would be a good asking price for the gt55 with less then 3k miles on it? I think I saw a new one for sale for 3300....
06-13-2007, 09:14 PM
#16
Originally Posted by 2000 Tran Zam
Good to know what are the price ranges from the S80 to S88 for what I would need to build?
what are the price ranges from the S80 to S88 for what I would need to build?prices are right on forcedinductions.com website under airwerks turbos
06-14-2007, 09:41 AM
#19
Originally Posted by Slowhawk
Well,I'll put it this way. 408ci,ET heads,234 Cam ,S85mm made 720rwhp through an unlocked 4L80 tranny in a 1500 truck ------ at only 10lbs of boost Nough said
Nough said 
, the S-series time and time again has shown it will spool fast, make HUGE power and fit in tight spots compared to other chargers of the same rating. 
06-14-2007, 10:12 AM
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Originally Posted by Slowhawk
Well,I'll put it this way. 408ci,ET heads,234 Cam ,S85mm made 720rwhp through an unlocked 4L80 tranny in a 1500 truck ------ at only 10lbs of boost Nough said
Nough said Interesting...
PSJ, lets talk
