Which turbo is a direct swap for my ITS GT80
12-21-2007, 07:55 AM
#1
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Which turbo is a direct swap for my ITS GT80 the turbo that has been collecting dust under the hood of my truck is a ITS GT80 with 1.15 A/R on a 8.5:1cr 408 with ET245 heads. The build has been, um, interesting. Anywho, it is suspected that the turbo may have some issues and Innovative is out of business. Two questions:
-is that turbo a good fit for my truck to be a bad *** daily driver that will make 750rwhp?
-if not, what turbo would be that would be a direct fit? can't be physically bigger due to lack of space where it is mounted
if it helps the kit uses truck manifolds and a 4" downpipe and 4" exhaust with no cats.
-is that turbo a good fit for my truck to be a bad *** daily driver that will make 750rwhp?
-if not, what turbo would be that would be a direct fit? can't be physically bigger due to lack of space where it is mounted
if it helps the kit uses truck manifolds and a 4" downpipe and 4" exhaust with no cats.
12-21-2007, 10:57 AM
#4
that turbo should make what you want. i made 780rw with mine back in the day and it wasn't maxed out.
from there i went to a custom 76mm and made a little more hp, then i went to a pte-88 and made more still, though the 88 is larger by a bit.
what do you mean innovative is out of business?
from there i went to a custom 76mm and made a little more hp, then i went to a pte-88 and made more still, though the 88 is larger by a bit.
what do you mean innovative is out of business?
12-21-2007, 12:33 PM
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their website is down, they don't answer there phones(or so i'm told). The only site that is up is the .com/au site.
anywho, I know jack about jack when it comes to turbos. It recently on 6lbs boost recorded 30lbs backpressure. Anyone else see a problem here? Not sure what the problem is. It's being investigated
anywho, I know jack about jack when it comes to turbos. It recently on 6lbs boost recorded 30lbs backpressure. Anyone else see a problem here? Not sure what the problem is. It's being investigated
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12-21-2007, 02:49 PM
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it's all way over my head. I'm sure the guys at W2W will figure it out. I just figured I'd thow it out there to see if anyone had ideas. They are off now until Jan 2 so I'm gonna try to learn a bit in the mean time.
They did tell me it is running awesome aside from the boost/backpressure issues.
They did tell me it is running awesome aside from the boost/backpressure issues.
12-21-2007, 02:54 PM
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i'm certain the guys at w2w will figure it out, obviously. I'm just throwing it out there to see what the concensus is. I'm voting for something must be wrong with the turbo. Either that or someone stuck a pumpkin in my tailpipe and i didn't know it, lol
12-21-2007, 03:06 PM
#12
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Let's put it this way... that turbo makes enough HP in the TTI Race kit to push a 3700lb car 9.9 at 140mph. That's a 402 LS2 with a mild cam, out of the box AFR 225 heads, LS2 Intake running at 15psi on 94 octane pumped by mototron 60lbs injectors. All hooking up on a Turbo 400 trans and a 9" rear with drag radials out back with stock front wheels just the way the car drives around town. There is some more left in the combo too.
With the 1.15 A/R and 4" down pipe and exhaust you aren't as far into the back pressure world as I am yet but you'll be a bit higher up the RPM range for full boost. My car can make 12psi on the transbrake at 3,600 rpms and be at 15psi by the 60' when I shift to 2nd gear.
Now if you think there is something physically wrong, you might be able to give Rick Head a call at Exile Turbo to see what he thinks. I'll apologize in advance to the sponsors and mods for posting his new business but I would think he's probably the most knowledgeable person that's reachable when it comes to legacy ITS products.
Rick
With the 1.15 A/R and 4" down pipe and exhaust you aren't as far into the back pressure world as I am yet but you'll be a bit higher up the RPM range for full boost. My car can make 12psi on the transbrake at 3,600 rpms and be at 15psi by the 60' when I shift to 2nd gear.
Now if you think there is something physically wrong, you might be able to give Rick Head a call at Exile Turbo to see what he thinks. I'll apologize in advance to the sponsors and mods for posting his new business but I would think he's probably the most knowledgeable person that's reachable when it comes to legacy ITS products.
Rick
12-21-2007, 04:29 PM
#14
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True drop the cat and run a cutout before the muffler when you want to run anything over 15lbs of boost. The electric cutout works great for quick and easy management of the power vs. stealth appeal. 
Rick
Rick
12-21-2007, 06:26 PM
#15
High exhaust pressure can be caused by any number of things.
Of course, it can be caused by the obvious stuff. . . too small a turbine wheel, too small AR, too small exhaust, restrictive muffler or cat.
The not-so-obvious stuff can also cause it, such as too small a compressor for the cid.
And the things that most don't know about can also cause high backpressure. Things such as a restrictive air filter, restrictive intercooler or piping, or even a throttle body that's not opening all the way. You see, the turbo is trying to produce a certain amount of boost. When you restrict the cold side, the wastegate will route all the exhaust through the turbine to try to reach said boost level. In doing so, the exhaust pressure will go through the roof.
Mike
Of course, it can be caused by the obvious stuff. . . too small a turbine wheel, too small AR, too small exhaust, restrictive muffler or cat.
The not-so-obvious stuff can also cause it, such as too small a compressor for the cid.
And the things that most don't know about can also cause high backpressure. Things such as a restrictive air filter, restrictive intercooler or piping, or even a throttle body that's not opening all the way. You see, the turbo is trying to produce a certain amount of boost. When you restrict the cold side, the wastegate will route all the exhaust through the turbine to try to reach said boost level. In doing so, the exhaust pressure will go through the roof.
Mike
12-21-2007, 08:49 PM
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keep it coming. i would have to say the exhaust is NOT the issue. no cats. stock dmax exhaust, very free flowing. I'm liking the idea of the other end being the problem.
hmm, i do seem to recall Dez saying something about my intercooler collecting water at one point in time about a year ago. something to think about i'm sure. The TB is a NW90. I had a vacuum test done back in march or april before the kit was pulled apart and re-welded cause the first guy welds like a 3rd grader and there were a few leaks found. One was on the input shaft to the TB. it was minor but definately there. Another thing to look at after the holidays.
I emailed the guy I bought the turbo from to get more specific specs. Waiting on a response. If for some reason the turbo was damaged, would that cause the symptoms it is showing? low boost, high back pressure etc???
The reason I ask is, they found a BOLT inside the turbo the other day. Totally lodged in there but didn't appear to cause any damage. Still builds boost to a certain point, blades spin freely, no chips, cracks, etc in the blades. No difference in performance pre/post bolt, lol.
I almost bought a GT4276 with 1.28 a/r (recommended by precision) today to replace the GT80 but I decided to gather as much info in the next few weeks as possible before purchasing another turbo, just in case you all come up with a rational answer to my problems.
Thanks for the responses. Keep em coming please
hmm, i do seem to recall Dez saying something about my intercooler collecting water at one point in time about a year ago. something to think about i'm sure. The TB is a NW90. I had a vacuum test done back in march or april before the kit was pulled apart and re-welded cause the first guy welds like a 3rd grader and there were a few leaks found. One was on the input shaft to the TB. it was minor but definately there. Another thing to look at after the holidays.
I emailed the guy I bought the turbo from to get more specific specs. Waiting on a response. If for some reason the turbo was damaged, would that cause the symptoms it is showing? low boost, high back pressure etc???
The reason I ask is, they found a BOLT inside the turbo the other day. Totally lodged in there but didn't appear to cause any damage. Still builds boost to a certain point, blades spin freely, no chips, cracks, etc in the blades. No difference in performance pre/post bolt, lol.
I almost bought a GT4276 with 1.28 a/r (recommended by precision) today to replace the GT80 but I decided to gather as much info in the next few weeks as possible before purchasing another turbo, just in case you all come up with a rational answer to my problems.
Thanks for the responses. Keep em coming please
12-21-2007, 10:33 PM
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there's some pics of the setup in this thread
https://ls1tech.com/forums/showthrea...056&highlight=
i think thats the thread that talks about the water in my intercooler and exhaust. not sure
https://ls1tech.com/forums/showthrea...056&highlight=
i think thats the thread that talks about the water in my intercooler and exhaust. not sure
12-21-2007, 11:20 PM
#18
...The reason I ask is, they found a BOLT inside the turbo the other day. Totally lodged in there but didn't appear to cause any damage. Still builds boost to a certain point, blades spin freely, no chips, cracks, etc in the blades. No difference in performance pre/post bolt, lol. ..
Mike
12-22-2007, 08:44 AM
#19
Go big or go home Dan, I suggest putting in the biggest turbo you can fit in replacement considering you have a large 408 feeding it!
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12-22-2007, 08:45 AM
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i suspect the crackheads who did the powder coating/polishing of the turbo are responsible for the bolt.
Lets assume the turbo is thrashed and that is the reason for the boost/backpressure issues. Would a ST80 be a good choice? direct fit?
Can't go bigger, no room
Lets assume the turbo is thrashed and that is the reason for the boost/backpressure issues. Would a ST80 be a good choice? direct fit?
Can't go bigger, no room