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Old 11-11-2008, 11:57 PM   #1
sburck
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Default Benefits of rotated turbos?

From what I have gathered reading through posts and FAQ's, in general rotated turbo kits are reserved for big turbo's as they can fit them and flow the air more efficiently. Many companies make rotated kits for turbos in sizes like the gt3071 and gt3076, which from what I understand are smaller turbos then the gt35, which is available as a stock mounted turbo from some manufacturers (or other turbo's this size).

From what I have read so far, the benefits of going rotated are:

-more efficient pathways for the air to flow, giving lower spool up's and higher power in general.

-Room to fit a bigger turbo.

I am pondering different turbo options and I am having trouble getting a sense of how different a rotated setup is vs a setup with the same turbo in stock location. I would imaging this varies with the size of the turbo, ex. a rotated 16g wouldn't see too many benifits over a stock mounted 16g, but a rotated gt35 would...
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Old 11-12-2008, 07:24 AM   #2
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There is no such thing as lower spool up and better top end in the turbo world. From the Turbo FAQ:

What is a rotated mount turbo? Any turbo that's physical size prevents mounting in the stock location. They also generally have larger than an OEM inlet size which necessitates TGV deletes and a larger turbo inlet pipe. They also require custom exhaust components and generally use an external wastegate set-up.

Did you need more information that this? If so, there is none. Rotated is ONLY done to use a top mount or for the bling of saying rotated as if cocking the turbo gives you some mythical gains. It's a huge waste unless you need to rotate it.
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Old 11-12-2008, 08:45 AM   #3
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As usual Unabomber is spot on

its 95% due to turbo size being unable to follow the stock path for intake or exhaust.

I have a rotated FP Green ( a very supposid stock location turbo ).....when fitting things up it was hitting the bell housing alot!! So it was kicked off to the side. Moving the stock placement will help in accessibility to nuts and bolts
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Old 11-12-2008, 10:41 AM   #4
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Quote:
Originally Posted by dangerousatom View Post
As usual Unabomber is spot on

its 95% due to turbo size being unable to follow the stock path for intake or exhaust.

I have a rotated FP Green ( a very supposid stock location turbo ).....when fitting things up it was hitting the bell housing alot!! So it was kicked off to the side. Moving the stock placement will help in accessibility to nuts and bolts
I have seen the uprgaded stock location turbos made to be rotated. I think its genius. Re-routing the inlet pipe from under the intake manifold is a HUGE plus.
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Old 11-12-2008, 11:50 AM   #5
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going rotated will allow you to run a larger intake
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Old 11-12-2008, 12:42 PM   #6
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Quote:
Originally Posted by cpunlamd View Post
I have seen the uprgaded stock location turbos made to be rotated. I think its genius. Re-routing the inlet pipe from under the intake manifold is a HUGE plus.
Yup!! that would look like this:






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Old 11-13-2008, 12:22 AM   #7
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Interesting.
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Old 11-13-2008, 01:22 AM   #8
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subaruwrx04-Correct me if i am wrong but, going rotated does not allow you to run a bigger intake inlet size does.
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Old 11-13-2008, 02:08 AM   #9
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Quote:
Originally Posted by douthinkicare View Post
subaruwrx04-Correct me if i am wrong but, going rotated does not allow you to run a bigger intake inlet size does.
You can get a bigger intake on a rotated turbo than you can fit under the manifold of a stock location turbo so yes, you can run a bigger intake tube on a rotated turbo
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Old 11-13-2008, 03:58 AM   #10
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Where can I buy that? Does it come with a DP?
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Old 11-13-2008, 04:21 AM   #11
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No, but it comes with a 4" extension for any other downpipe.

Kind of "S" shaped.

Well actually more like a Z if you look at it from the driver's side.
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Old 11-13-2008, 01:58 PM   #12
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Someone who will make this up-pipe extension to make the stock location turbo's rotated (w/ external wastegate flange) is going to make ALOT of $$$$.

I think the kit will include:
1. extension (as per pic above)
2. turbo inlet/intake (1 piece)
3. down pipe
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Old 11-13-2008, 02:38 PM   #13
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If someone was to actually make something like this, why would you just do an extension off the stock uppipe when you can just make 1 solid uppipe? Less flanges, less gaskets and much cheaper than 1 uppipe and 1 extension.
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Old 11-13-2008, 03:10 PM   #14
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Doesn't Turbo XS make a kit like that?
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Old 11-13-2008, 03:21 PM   #15
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Quote:
Originally Posted by alcoolaid View Post
Doesn't Turbo XS make a kit like that?
Similar, but the wrong bolt pattern
The TXS extension has the square 4-bolt flange for your typical T31 exhaust housing, the stock location turbos need the triangular 3-bolt flange.
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Old 11-13-2008, 04:27 PM   #16
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Ok here is the skinny on the setup:

- Its not a kit, it was a total custom fabrication job
- It was created due to necessity much more than just, Hey straight up lets rotate a stock mount turbo.

After installing a few 3" inlet stock mount turbos. Ryan and I at www.AREA1320.com saw too many issues with crushing the inlets to fit. The general up and down sizing of the inlet from 3-2.5-3" with cuplers and bends. In addition the extremely tight fitment across the board add difficulty to access flange blots and oil-water cooling hoses. Along with the header and UP I used causing the FP Green to hit the bell housing more than a little. The car was down for over a year ( in an accident ) between paint, body, and rotating manifold-turbo ect... So we used the time to fabricate and R-n-D what you see now.

If you want the full story go here: http://forums.nasioc.com/forums/show...ht=swap&page=5

There are still a few minor tweaks needed but the car runs amazingly 391 whp at 20lbs on 93 oct. and that's with intermittent high end spark breakup and or the MAF scaling being off. The EWG needs some rerouting and to be a 44 not a 38 ( 2-3lbs of boost creep )

I seriously doubt AREA1320 would ever create a kit they are very busy busy 24-7. If they did it would not be cheep and I assume it would be a in-house install only deal due to the fact that fitment is never exactly the same when mixing "vendor X's" up pipe with "vendor Y's" down pipe and so on.
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Old 11-13-2008, 06:32 PM   #17
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Adam is right.

When dealing with big "and I use that term loosely" stock location turbos, fitment is less than perfect. Do a search for how many people have had fitment issues with those things.

The FP Green is one of the worst fitting turbos I have every installed. Between TGV clearance issues to having to shave the bell housing to fit the compressor.. Toss an aftermarket up pipe and or header in the mix then fitment goes out the window.

We had major problems with his install.. Thats when we decided to go rotated. as you can see we went a little extreme with his install :P Doing an "adapter" and mass producing that along with a down pipe just cannot happen. between people with cruise control, stock tmics adn the such just can't happen. Im always willing to custom make one for anyone who has the funds to do so.

The biggest advantage in my eyes with a rotated turbo is ease of repair.

-Ryan
Area1320
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Old 11-13-2008, 07:21 PM   #18
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Because Rotated looks cool XD
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Old 11-13-2008, 07:25 PM   #19
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Seeing as Buschur's rotated stock mount turbo kit got horribly flamed to death, I don't see how another person's will (in mass production) succeed.

Edit> then again if someone was just selling the adapter and letting people piece their own systems together it would probably do well.
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Old 11-13-2008, 07:33 PM   #20
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Quote:
Originally Posted by MGAMAN View Post
Seeing as Buschur's rotated stock mount turbo kit got horribly flamed to death, I don't see how another person's will (in mass production) succeed.

Edit> then again if someone was just selling the adapter and letting people piece their own systems together it would probably do well.

I think you still can, using Buschur's idea. I remember seeing that, and it seemed that the only real piece they offered was the adaptor, and you could go with their UP/DP or piece together your own. I guess the only way that would NOT be possible was if the adaptor was different from any other out there, such that the rest of the setup would have to be entirely custom.
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Old 11-14-2008, 10:07 PM   #21
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Simple rotated turbos have more options IE done right will make loads more power than a stock location turbo. my .02 cents
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Old 11-15-2008, 09:34 AM   #22
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Did you guys remove the factory uppipe brackets? Not that it makes it easier, but you have much better control of the turbo's final position. For example, without those brackets, the dom 3 tends to sit in a bad place.
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Old 11-15-2008, 11:45 AM   #23
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Quote:
Originally Posted by kmurphy View Post
If someone was to actually make something like this, why would you just do an extension off the stock uppipe when you can just make 1 solid uppipe? Less flanges, less gaskets and much cheaper than 1 uppipe and 1 extension.
Because many peoples already have after market up-pipes (or would want to use their oem sti up-pipes which is very good already). But in your defense, some one can always make 2 versions. (are you up to it KMurphy?)

Last edited by cpunlamd; 11-15-2008 at 11:58 AM.
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Old 11-15-2008, 11:54 AM   #24
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Quote:
Originally Posted by Dipp View Post
Simple rotated turbos have more options IE done right will make loads more power than a stock location turbo. my .02 cents
Your right in a sense. But most rotated turbos are ALOT larger than the factory unit. Not everyone is willing to go that large which requires alot of supporting mods and tuning. Also not everyone is willing to trade off for more turbo lag. Also factor the added expenses of the new turbo which can range from $1200 - 1800.

So if you factor the regular price of a complete rotated turbo set up: $2600. Subtract the cost of the turbo and ewg from a stock location rotated set up (since most will use their current turbo) and the price should be around $1000 for this kit:

1. up pipe
2. down pipe
3. dump tube
4. air intake kit
5. braided oil feed, drain line
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Old 11-15-2008, 11:57 AM   #25
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Quote:
Originally Posted by dangerousatom View Post






This looks VERY cool. I cant believe with all these fabricators, this kit has never been in the making. If I was in the biz, I would take this market by storm. The number of those wrx/sti owners who run stock location turbos (oem and upgraded) out number those running the conventional rotated set ups. So the market would be HUGE!
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