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Old 09-04-2005, 11:12 PM   #1
moby4dick
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Subaru Stars GP Moto GT32 twin scroll, Rallispec twin scroll, any experience?

I"ve been really intrigued by a twin scroll turbo kit, but have not read of ANYONE using it.

Anyone?

Also, regarding the GPMoto kit, I was curious if you could use a standard downpipe, or if due to the so called rotated mount, you HAD to use theirs. I'd like to have at least one cat and I think the GP Moto setup is catless. Thus ideally, I'd get the turbo, headers and supporting oil lines/misc hardware but use someone elses TBE. Guess I'll be giving those guys a call.

Similarly, anyone tryout the factory twin-scroll setup like Rallispec sells? Same questions as the GPMoto.

Thanks!
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Old 09-05-2005, 12:04 AM   #2
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Recently I have been playing with the idea of running a twin scroll setup. From what I have pieced together if you buy a standard Subaru twin scroll kit it will come with a DP from Subaru (not the same as our DP, different bolt pattern) with a cat in it. It should also have the headers, uppipe, turbo, oil pan, oil feed lines, and a dip stick for the new pan. The GP moto kit needs it own DP also because garret doesn’t make direct bolt on turbo for our cars to my knowledge.

If you talk to the GP moto people please let me know when the turbo spools on our little 2.0L and what max HP we should expect to see.

For more info on the VF37 setup talk the guys at www.IAPERFORMANCE.com.

Best of luck
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Old 09-05-2005, 01:07 AM   #3
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I'll try and talk to the GPMoto people on Tuesday.

Rallispec offers the PE1825 option with the factory twin scroll kit. But with the factory kit, I'm assuming there will be at least 2 cats, both in the DP and the midpipe going to the muffler. That's one too many for me. Do you know if the UP has one as well?
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Old 09-05-2005, 01:00 PM   #4
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fwiw there are 2 uppipes with a twin scroll and no cats... and a jdm twin scroll DP won't bolt to a USDM cat back either (differnt lengths)

and no you won't be using a standard DP with the GPmoto kit but its my understanding that you can use a standard cat back
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Old 09-05-2005, 01:05 PM   #5
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www.IAPERFORMANCE.com is alot cheaper then rallispec. They are also good about returning emails (no idea how rallispec is).
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Old 09-05-2005, 01:57 PM   #6
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FWIW, Rallispec has returned all my emails very promptly.
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Old 09-06-2005, 12:48 AM   #7
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Quote:
Originally Posted by Jaxx
fwiw there are 2 uppipes with a twin scroll and no cats... and a jdm twin scroll DP won't bolt to a USDM cat back either (differnt lengths)

and no you won't be using a standard DP with the GPmoto kit but its my understanding that you can use a standard cat back

So based on this, with either the GPMoto kit OR the twin scroll kit, there is no "bolt on" solution for going with at least one cat? Makes it pretty hard to pass emissions!
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Old 09-06-2005, 08:04 AM   #8
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I have a OEM twin scroll with a Turbo XS downpipe and cat. All it took was a twin scroll flange from IA Performance and a good welding shop. Not "bolt on" but not really fabricated either.
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Old 09-06-2005, 08:27 AM   #9
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Quote:
Originally Posted by moby4dick
So based on this, with either the GPMoto kit OR the twin scroll kit, there is no "bolt on" solution for going with at least one cat? Makes it pretty hard to pass emissions!

JDM DP does have 1 cat in it. The you can get one of these JDM catbacks.
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Old 09-12-2005, 02:02 AM   #10
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Quote:
Originally Posted by fragment
I have a OEM twin scroll with a Turbo XS downpipe and cat. All it took was a twin scroll flange from IA Performance and a good welding shop. Not "bolt on" but not really fabricated either.
That TurboXS downpipe replaces the midpipe as well, correct?
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Old 09-12-2005, 02:06 AM   #11
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Quote:
Originally Posted by J-Rex2004
JDM DP does have 1 cat in it. The you can get one of these JDM catbacks.
That Cusco one says its JDM spec, but fail to go into detail on what that means.

If it means the turbo flange side is JDM spec, then it will bolt right up to the twinscroll bellmouth-style flange.

If it means something else (length, or catback end spec) then it could be a problem?

Any more detail on that dp?
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Old 09-12-2005, 08:20 AM   #12
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Quote:
Originally Posted by eclip5e
That TurboXS downpipe replaces the midpipe as well, correct?
Its a short style downpipe with a separate 3" mid pipe with high flow cat.
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Old 09-12-2005, 08:59 AM   #13
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Quote:
Originally Posted by eclip5e
That Cusco one says its JDM spec, but fail to go into detail on what that means.

If it means the turbo flange side is JDM spec, then it will bolt right up to the twinscroll bellmouth-style flange.

If it means something else (length, or catback end spec) then it could be a problem?

Any more detail on that dp?
I said get one of these catbacks...the ralli spec twin scroll setups come with the JDM DP. FWIW, the CUSCO does not have a twin scroll flange, its just the length that is different. I don't remember if the JDM DP's are longer or shorter than the US ones, but there is a difference.
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Old 09-13-2005, 06:09 PM   #14
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Quote:
Originally Posted by J-Rex2004
I said get one of these catbacks...the ralli spec twin scroll setups come with the JDM DP. FWIW, the CUSCO does not have a twin scroll flange, its just the length that is different. I don't remember if the JDM DP's are longer or shorter than the US ones, but there is a difference.
I think the easiest thing is to welde the twinscroll flange onto a Helix bellmouth or Invidia.
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Old 02-12-2006, 03:00 PM   #15
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back to the subject here, so does anyone had a GT32 or a VF twin scroll on the USDM 2.0L how well does it hold, or how long will ht last?
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Old 02-13-2006, 02:12 PM   #16
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Quote:
Originally Posted by o2sys
back to the subject here, so does anyone had a GT32 or a VF twin scroll on the USDM 2.0L how well does it hold, or how long will ht last?
bump....
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Old 02-13-2006, 03:41 PM   #17
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If you buy a VF37 kit its OEM on cars in japan so i would image that as long as you treated it well it should last along time. Now if your wondering about power then this might help you:

http://www.ktrperformance.com/dyno_t....php?id_num=19
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Old 02-13-2006, 03:43 PM   #18
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Quote:
Originally Posted by line
If you buy a VF37 kit its OEM on cars in japan so i would image that as long as you treated it well it should last along time. Now if your wondering about power then this might help you:

http://www.ktrperformance.com/dyno_t....php?id_num=19

well for the VF37 i figure it not as bad since VF are small turbos, but how about the GT32? is GT32 even a true twin scroll? where would you get a uppipe for it?
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