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Old 01-01-2008, 12:11 AM   #1
silver07sti
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Default What would be the spool up difference between a bolt on gt30r vs a roatated gt30r?

What would be the spool up difference between a bolt on gt30r or something very close vs a roatated gt30r? Also what would be the the largest turbo i shoulkd use on my sti if i were to go with a bolt on turbo and since i wold only be able to use a 3inch intake because nothing larger will fit right?
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Last edited by silver07sti; 01-01-2008 at 12:27 AM.
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Old 01-01-2008, 11:19 AM   #2
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If you want to go this big, go straight for rotated. The perrin kit, for example, is $2700 or so. An SZ55 or FP Red is $1400-$1700 , plus you will need a DP and likely a EWG to control it and avoid creep/spikes. The rotated kits start to make excellent economic sense. Plus, they open up the intake tract considerably, and the turbine housings flow more for better top end. The only real downside is some custom fab to connect to some interoolers.
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Old 01-04-2008, 07:49 AM   #3
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What would be the spool up difference between a dom 3 and a same size rotated turbo? I just want to see what i'm getting into.
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Old 01-04-2008, 07:59 AM   #4
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your def. going to see a noticeable increase in turbo response and boost threshold in a rotated setup. The rotated 30r's use 4" compressor inlets with antisurge housings, big upgrade IMO. You also will be able to use the standard 't3' flange turbine outlet.

IMO you really should go rotated, the hybrids are not nearly as reliable as a true garret. Also keep in mind once you have a rotated setup you now can use any one of the dozens of t3 flanged turbos on the market without worry about fitment or subaru specific application meaning you can downsize and upsize freely and only swap the turbo and nothign else.

A ej257 with a rotated 3076r on the .64 hotside will have full spool by 3500 on pump, you would essentially have superior spool to a stock sti with a 55lb. turbo. I spent a LONG time and ALOT of research trying to decide between a rotated 30r and the ewg 20G setup I went with.
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Old 01-04-2008, 08:30 AM   #5
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Quote:
Originally Posted by Zornorph View Post
If you want to go this big, go straight for rotated. The perrin kit, for example, is $2700 or so. An SZ55 or FP Red is $1400-$1700 , plus you will need a DP and likely a EWG to control it and avoid creep/spikes. The rotated kits start to make excellent economic sense. Plus, they open up the intake tract considerably, and the turbine housings flow more for better top end. The only real downside is some custom fab to connect to some interoolers.
Wait you just told him to go rotated and named the 2 of the bigger bolt on's.

The Red is 65lb and is $1400-$1700. The SZ55 flows 770CFM and is going to run you $2000 and thats IWG setup (I have one) and well worth the cost it comes lifetime free rebuilds, P&P, and both the exhaust & compressor sides ceramic coated.
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Old 01-05-2008, 07:18 AM   #6
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Quote:
Originally Posted by sluflyer06 View Post
your def. going to see a noticeable increase in turbo response and boost threshold in a rotated setup. The rotated 30r's use 4" compressor inlets with antisurge housings, big upgrade IMO. You also will be able to use the standard 't3' flange turbine outlet.

IMO you really should go rotated, the hybrids are not nearly as reliable as a true garret. Also keep in mind once you have a rotated setup you now can use any one of the dozens of t3 flanged turbos on the market without worry about fitment or subaru specific application meaning you can downsize and upsize freely and only swap the turbo and nothign else.

A ej257 with a rotated 3076r on the .64 hotside will have full spool by 3500 on pump, you would essentially have superior spool to a stock sti with a 55lb. turbo. I spent a LONG time and ALOT of research trying to decide between a rotated 30r and the ewg 20G setup I went with.

The 3076r with a .63 ar is a 55lb turbo? As as far as spool up between a bolt on turbo and a rotated turbo would the spool up difference be like 200 rpms if not how much more? Thanks.
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Old 01-05-2008, 10:53 AM   #7
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Quote:
Originally Posted by silver07sti View Post
The 3076r with a .63 ar is a 55lb turbo? As as far as spool up between a bolt on turbo and a rotated turbo would the spool up difference be like 200 rpms if not how much more? Thanks.
A bolt-on of what size? A green? A SZ55? Fpred? Dom3?

The fact of the matter is that a turbo of equivalent size is not going to spool as good in stock location as it will rotated, the larger turbos really need a open intake tract for effeciency, I'm sure you seen all the supra videos where you'll see just a filter attached to the compressor inlet, you can do the same thing with a suby if you mount the MAF in a blow-thru setup.

The 3076R is good for up to about 450whp.

Pretty sure its 55lb, might be 52lb. You'll want to double check. Its big for sure.
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Old 01-05-2008, 01:18 PM   #8
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Quote:
Originally Posted by 4ST-AIR View Post
Wait you just told him to go rotated and named the 2 of the bigger bolt on's.

The Red is 65lb and is $1400-$1700. The SZ55 flows 770CFM and is going to run you $2000 and thats IWG setup (I have one) and well worth the cost it comes lifetime free rebuilds, P&P, and both the exhaust & compressor sides ceramic coated.
Um, yeah... I think his point was that for a little more money than those bolt-ons (which you might have to spend anyway) you can go w/ a rotated setup, and have more upgradability.
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Old 01-05-2008, 01:28 PM   #9
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Old 01-05-2008, 01:39 PM   #10
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Retail price on the Perrin GT35R kit is $7084?

Why is a bov price listed under Crawford? I thought they dont require a bov?

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Old 01-05-2008, 01:51 PM   #11
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^Yep - that's for the full kit including everything (intercooler, injectors, fuel pump, manifold, uppipe... ... ...) Not that I'd ever buy a Perrin kit, but that's what you get.

I did my research... it's my spreadsheet

I tried to keep everything pretty much equal across the board, so I listed a BOV with the Crawford kit. Yeah, they don't require it, and nor does any other kit, but most do so it stayed. Obviously the spreadsheet isn't 100% accurate FWIW.
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Old 01-05-2008, 04:05 PM   #12
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Quote:
Originally Posted by STIBungy View Post
Retail price on the Perrin GT35R kit is $7084?

Why is a bov price listed under Crawford? I thought they dont require a bov?
look at the post below.

No kit requires a bov. People choose to run one

squashman decided to make it a level playing field to try and accurately tell what each kit would cost.

Quote:
Originally Posted by squashman View Post
^Yep - that's for the full kit including everything (intercooler, injectors, fuel pump, manifold, uppipe... ... ...) Not that I'd ever buy a Perrin kit, but that's what you get.

I did my research... it's my spreadsheet

I tried to keep everything pretty much equal across the board, so I listed a BOV with the Crawford kit. Yeah, they don't require it, and nor does any other kit, but most do so it stayed. Obviously the spreadsheet isn't 100% accurate FWIW.

ha! I know your SN here, now.
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Old 01-05-2008, 04:43 PM   #13
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Quote:
Originally Posted by STIBungy View Post
Retail price on the Perrin GT35R kit is $7084?
You need to look at what's included in this number to understand it. The turbo itself is a small part of the package. Once you add up all the ancillary stuff that this kit includes, and then tack that on to the other kits (which do not include them), the prices even up a lot.
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Old 01-05-2008, 06:57 PM   #14
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Are you asking what the difference in spool/threshold would be with two identical turbo's mounted differently (Rotated and stock location)?
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Old 01-06-2008, 07:11 AM   #15
silver07sti
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Would the spool up difference between a ultimate racing rotated GT3076R kit and a bolt on dom 3 be more than 200 rpms in difference at full boost between the two with mods as close as possible to each other? From what i've read they both can produce up to 520 hp in proper configuration. The reason I am asking is if the differnce is between 300-500 rpms for full boost between the two. I dont want to get raped by people with fast spooling single scroll rotated gt30r kits and then imagine if they had a twin scroll rotated gt30r kit the loss in whatever circumstance would be even worse with similar hp figures. If the full boost difference ends being to much and when I say to much i mean 300-500rpms between the bolt on turbo and the single scroll rotated kit with the same hp producing turbo under full boost. I will just be willing to go straight to a full race twin scroll setup. Because gains from a twin scroll kit in terms of boost response and full boost time compared to a single scroll rotated kit are substantialy quicker from what I read and make for a better daily driver sti and a better powerbanded sti with a stock block. And the fact that i really have no interest in a rotated single scroll bolt on turbo kit. Because the price would be close to a twin scroll gt35r kit. And the gt35r bolt on turbos do not produce very good numbers compared to rotated gt35r kits because of that whole intake and exhaust housing size limit gt35r's have when bolt on. I understand that some of the other smaller bolt on turbos have a similar issues but are not affected as significantly as a turbo in the class of a gt35 or close to it.

Last edited by silver07sti; 01-06-2008 at 07:23 AM.
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