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Project - Garrett T6 QSV

6.6K views 77 replies 27 participants last post by  1001whp  
#1 ·
I was very impressed with the results other members were having with their T4 QSV's but could not find any results for the T6 version. I was convinced that if a small T4 could show promising gains, a T6 version had to deliver. It didn't take much for me to join the QSV bandwagon and I ended up purchasing the HD version. I dove right into the project and I now know why T6 QSV users are a minority.

We all know by now that the QSV only works with a divided housing. Well good luck finding one for a Garrett turbo. If anyone decides to go this route i'd suggest using a B/W turbo as T6 housings are plentiful and inexpensive.

Garrett divided T6 housing...

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#5 ·
I've heard that as well, like from a tractor trailer used in Europe that had limited production numbers. There is a member on here that has a contact but they come at a premium. I got lucky and bought it used from Sins4u33 who used with a FR manifold for a true divided setup.
 
#3 ·
The disassembly begins...

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I spent many nights fabbing up this recirculated 5" downpipe and cutting it up was probably the hardest part in making the decision to go QSV...

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#6 ·
O man, I don't work well under pressure... :run:
 
#9 ·
Lol, something must of happened when I turned 30 considering there is something about a quiet wingless Supra making 1000+ whp that attracts me...
 
#13 ·
Do you now if a GT4594 turbine is the same as a GT47 except for a/r differences? I have anyway found lots of both GT45 and GT47 turbos on popular swedish trucks, gonna try to find out if its a divided housing on any of them.
 
#14 ·
Sorry bro, i'm not sure where it came from as any contact I had kept everything quiet. Can't blame them, its good for business. I swore I saw a T6 GT45 housing but Reid @ SP confirmed they don't exist. The only other option I came across was a T6 GT42 housing that comes divided. I almost went this route with a GT4276 (PT7675 CEA or PT7685 CEA) but the cost held me back. :crazy:

The cool thing about my housing is I can swap out for a PT8284 CEA or its bigger brother the PT8884 CEA.
 
#15 · (Edited)
Got some news if anyone else would like to do like bluesteel, i know where to find Garrett T6 divided housings with a/r 1.27 :)

Im pretty sure that the GT45 turbo i found is with a T6 flange, maybe Reid said it didnt exist because he didnt now that its made for 12-16L diesel truck engines and is not on trucks for the north american market.. There are PLENTY of these trucks over here :)

Im waiting on pics and sizes on the divided housing now and will return with more info..
 
#16 ·
Got some news if anyone else would like to do like bluesteel, i know where to find Garrett T6 divided housings with a/r 1.27 :)

Im pretty sure that the GT45 turbo i found is with a T6 flange, maybe Reid said it didnt exist because he didnt now that its made for 12-16L diesel truck engines and is not on trucks for the north american market.. There are PLENTY of these trucks over here :)

Well done sir, if the GT45 housing is physically smaller than a GT47 it would actually be the better choice. I test fitted my housing last night and I had to introduce Miss Strut Tower to Mr. S. Hammer... :kiss:

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Looks right at home tho...

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#21 ·
#25 ·
I know Sound Performance said some minor grinding is required but I think "minor" was an understatement. This will be my weekend project along with finding a decent grinder for bits with 1/4" shafts. I don't think my dremel will do, lol :gapteeth:


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#27 ·
Thats the reason why building cars are fun, nothing is bolt on :)
There, I fixed it for you :)

Not even the housing was bolt on. Between the two flanges and the QSV, something wasn't allowing the bolts through so I had to open the holes a bit. But you're correct, it is fun...
 
#29 ·
Yea, I was just checking some out online. So far the Rotozip looks pretty good and it has an attachment for a 4" cut off wheel...
 
#32 ·
^^^^Thanks for the assist...

Well that wasn't much fun :wtf: Alot of meat needed to be removed. I guess the T6 design has larger ports for maximum flow which is irrelevant since it bottle necks back into a smaller port on the housing. Whatever, it fits now and the door swings freely.

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The housing came out better. Alot smoother, i'm going back to touch up the manifold flange before the final install.

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#33 ·
Since the QSV adds 3/4", pretty much everything needed to be modified. I started with the downpipe.

It fits real nice up top but just needed some work below...

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I had to cut my dp in half. I than took measurments and welded on a 1" section to make up the difference.

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The space wasn't a perfect 1" gap so i've been going back and forth with my grinder to get it right. Only did that bout 25 times already, lol. Gotta be perfect tho. At this point the QSV better deliver :nervous: I knew what I was getting myself into but this is alot of work. Until next update...
 
#35 ·
Thanks RWHP...

I went back and touched up the manifold flange, did a lil amateur port & polish work.

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I just realized I never actually showed pics of the QSV HD. Here it is without the actuator arm fastened. I had to modify the arm as the actuator was hitting the wastegate runner.

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You can see how the blade goes through the center of the shaft on the HD version. A much stronger design IMO...

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#36 ·
Before I got too far into the project, I figured i'd better check out an important aspect of this build... hood clearance

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It sits alot higher than I anticipated and looks mean as hell in the bay, but unfortunately the hood does not close. On the bright side, i'm glad I purchased this fiberglass hood way back. It will be alot easier to work with than the stocker, talk about hindsight, lol...

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#39 ·
I'm burning the midnight oil here so hopefully soon as long as there's no more surprises. I wanted to point out that the reason i'm having more of an issue than most with the DP is that I recirculated the wastegate. If you have an open dump it does not have to be perfect as there's room for error...


Looks badass with the compressor housing looking out through the hood :)
Lol, I agree. Have you made a decision on your cams? Those GSC are known for their high lift, I could see them being pretty potent on your setup...
 
#41 ·
Lots of progress, the hood closes and the DP is finished

Just tacking it up for fitment...

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Just in case anybody wanted to know what I looked like :gapteeth:

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All done...

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#42 ·
Besides the door getting hung up on the turbo and manifold flange, you also need to clearance the gaskets. Both needed some work but we're good to go now

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Getting real close here, next I have to mod the compressor pipe running to the intercooler. That 3/4" height increase makes a big difference...