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Which turbo to go for on my forged 2.5

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Old 12 October 2017, 10:57 AM   #1
watty88
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Default Which turbo to go for on my forged 2.5

Just looking at different turbo options on my forged hatch STI, im on a standard position GT3071r at the minute and make 450hp but it is slightly laggy. I'm wanting to go roatated soon and was thinking of going for a GT3076r, has anybody done the same if so how does it feel? What else should I consider? Cheers
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Old 12 October 2017, 11:22 AM   #2
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Sc46 and jobs done
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Old 12 October 2017, 11:34 AM   #3
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Originally Posted by Tidgy View Post
Sc46 and jobs done
Heard good things about the Sc46 but that's a standard position and I want to go roatated. Also I don't think there will be a huge difference between this and the turbo I have now, maybe spool slightly better?
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Old 12 October 2017, 12:20 PM   #4
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Originally Posted by watty88 View Post
Heard good things about the Sc46 but that's a standard position and I want to go roatated. Also I don't think there will be a huge difference between this and the turbo I have now, maybe spool slightly better?
you wont get much better spool vs power so your gonna have to drop your target, your also wasting alot of money going rotate just for the sake of it when standard positions turbo's will easily do it.
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Old 12 October 2017, 12:37 PM   #5
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Borg warner 7670 twinscroll is what I'm fitting to my forged 2.5 ticked all the boxs I wanted
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Old 12 October 2017, 12:53 PM   #6
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Borg warner 7670 twinscroll is what I'm fitting to my forged 2.5 ticked all the boxs I wanted
you do realise how much is involved in changing from single to twin scroll?
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Old 12 October 2017, 02:19 PM   #7
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Originally Posted by Tidgy View Post
you wont get much better spool vs power so your gonna have to drop your target, your also wasting alot of money going rotate just for the sake of it when standard positions turbo's will easily do it.
I know the standard position turbos have come on a lot but I want to be different and a rotated turbo looks boss too. Still pricing up at the minute so will have to compare.
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Old 12 October 2017, 03:02 PM   #8
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Running a standard location GTX3076R on my Forged CDB 2.5.

Still running the engine in at the moment at low boost (0.7 bar), but it feels great, spools very quickly. That's about all I can say at the moment until it's run in.
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Old 12 October 2017, 03:13 PM   #9
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Originally Posted by ScottyPPP View Post
Running a standard location GTX3076R on my Forged CDB 2.5.

Still running the engine in at the moment at low boost (0.7 bar), but it feels great, spools very quickly. That's about all I can say at the moment until it's run in.
You'll have to let us know how you get on once run in mate.
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Old 12 October 2017, 03:14 PM   #10
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You'll have to let us know how you get on once run in mate.
I will.

Hoping for high 400's, 500 would be nice .
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Old 12 October 2017, 06:48 PM   #11
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I run the forced performance red turbo(standard position) on my hatch sti ,, cheap compared to uk turbos ,, works great on my closed deck 2.5.. 531bhp @1.75bar
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Old 12 October 2017, 07:34 PM   #12
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Quote:
Originally Posted by Tidgy View Post
you do realise how much is involved in changing from single to twin scroll?
yes not much more than changing from standard position to rotated
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Old 12 October 2017, 08:08 PM   #13
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Quote:
Originally Posted by domino46 View Post
I run the forced performance red turbo(standard position) on my hatch sti ,, cheap compared to uk turbos ,, works great on my closed deck 2.5.. 531bhp @1.75bar
Great figures from a standard position, thanks I'll take a look.
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Old 12 October 2017, 08:35 PM   #14
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Having been speaking with Domino I'm going the FP Red also on my hatch sti
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Old 12 October 2017, 08:39 PM   #15
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Look at precision turbo for stock location, I reckon it's way better than the sc46, most sc46 I've seen barley make the 460hp but more the sc42 power with lag, you need a proper good set up inc worked heads to make a comfy 460 from what I've seen but it is best suited to a 2.5 engine.
Or rotated look at Borg warner, they are coming the top daddy's ATM for spool and power.

All depends on you hp target vs spool what you choose.
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Old 13 October 2017, 12:23 AM   #16
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Been reading about the FP Red too but wondered how suited it would be to a 2.1 AVCS?

Initially looked as SC/Blouch turbos but heard of some experiencing cracked exhaust housings?

Seen a few making good numbers on FP Greens but not sure what the difference is between the green and red?

Turbo is last on my list for my blob and i've been holding off on purchase as initially the aim was around 420bhp but we have engineered everything for up to 600 so a 500 capable turbo would be more suited. Short list I have so far are

MD321V
Precision
FP Green/Red
SC46 or 50
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Old 13 October 2017, 06:50 AM   #17
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one thing to remember with the FP turbos is they use there own a 83mm inlet for there turbos (as a option I think) ,,, you can then buy there own 83mm inlet pipe , works very well and no sign of collapsing ,, and was very easy to fit swell as didn't have to remove the inlet to fit it either
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Old 17 October 2017, 11:25 PM   #18
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Quote:
Originally Posted by ScottyPPP View Post
Running a standard location GTX3076R on my Forged CDB 2.5.

Still running the engine in at the moment at low boost (0.7 bar), but it feels great, spools very quickly. That's about all I can say at the moment until it's run in.
I have the rotated setup for that turbo

https://www.scoobynet.com/subaru-par...rbo-setup.html
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Old Yesterday, 12:16 PM   #19
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I drove my mates forged 2.5 with an MDX321V and the turbo suited it perfectly. good spool and pulled strongly. His car ran approx 460 reliably, made over 500 on E85.
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Old Yesterday, 01:53 PM   #20
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Just to clarify, whats the reasons for going rotated? As previously said, theres standard position spooly turbos out there.

It sounds like excessive work and expense just for a "boss" looking engine bay!
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Old Yesterday, 02:56 PM   #21
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Thanks for all the input.

I have since decided to stick with the standard position turbo as I was offered a very good turbo that should suit my setup nicely and is proven on the 2.5 (precision turbo)

The reason I wanted to go with a rotated setup mainly is simply to have the most efficient and least laggy setup I could have but after listening to people and doing further research the gains didn't justify the extra cost as people have stated.
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Old Yesterday, 06:13 PM   #22
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Quote:
Originally Posted by P555SBR View Post
yes not much more than changing from standard position to rotated
Equal length headers.
New sump.
New dip stick.
ECU.
Err perhaps a few more.
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