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Corsa catback + IHI VF56 twinscroll setup = superior sound
Corsa catback + IHI VF56 twinscroll setup = superior sound
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Old 09-12-19, 08:12 PM   #31
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Default Re: Corsa catback + IHI VF56 twinscroll setup = superior sound

Quote:
Originally Posted by STINick19 View Post
Not 100% relevant, but I wanted to share this because I thought some may find it interesting. A comparison of the JDM S4 FA20 & EJ207 powerbands..

WRX S4 FA20
Image Link

Max Power: 221kW (300PS) / 5600rpm
Max Torque: 400N・m (40.8kgf・m) / 2000-4800rpm
Engine upper limit rotation speed: 6500rpm

STI EJ207
Image Link

Max Power: 227kW (308PS) / 6400rpm
Max Torque: 422N・m (43.0kgf・m) / 4400rpm (90% of maximum torque @ 2400rpm)
Engine upper limit rotation speed: 8000rpm

They both have a nice "table top" peak torque plateau thanks to the ELH & twin scroll turbo. The EJ207's peak torque band is a bit higher and narrower, but carries power higher into the RPM range developing a bit more peak HP.

It'll be interesting to see what Subaru can do with the next gen FA powered STI without having to worry about stepping on the EJ's toes.
Is the EJ207 chart from the latest STI? Looks like they improved it from previous model.
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Old 09-12-19, 08:21 PM   #32
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Default Re: Corsa catback + IHI VF56 twinscroll setup = superior sound

Comparison between FA20DIT (JDM spec) and the Legacy S402 with its 2.5L twinscroll.





Needless to say, I think the FA20DIT is a nice engine (I only tried it a bit on Forester XT).
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Old 09-12-19, 08:52 PM   #33
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Quote:
Originally Posted by dlheman View Post
Is the EJ207 chart from the latest STI? Looks like they improved it from previous model.
Yep, from Subaru of Japan's website for the 2020 STI.
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Old 09-13-19, 03:14 AM   #34
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Default Re: Corsa catback + IHI VF56 twinscroll setup = superior sound

Actually, the GVF STI A-Line has an interesting torque curve of 350nm between 2800rpm to 6000rpm.
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Old 09-14-19, 12:40 PM   #35
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Default Re: Corsa catback + IHI VF56 twinscroll setup = superior sound

Quote:
Originally Posted by dlheman View Post
...and the Legacy S402 with its 2.5L twinscroll.

Actually, the GVF STI A-Line has an interesting torque curve of 350nm between 2800rpm to 6000rpm.
You find all of the good stuff! I had no idea that there was ever a 2.5L twin scroll offered. Its poweband is very similar to the FA20. It'll be interesting to see what Subaru can do with the FA24DIT if the rumors of it powering the STI are true.

The STI A-Line's torque curve was more along the lines of what I was expecting for the S402's twinscroll 2.5L. Surprisingly, everything that I'm reading about the A-Line suggests that it has a single scroll turbo.
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Old 09-15-19, 07:09 AM   #36
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Default Re: Corsa catback + IHI VF56 twinscroll setup = superior sound

Yes, the STI A-Line uses VF48 single scroll turbo.

Could be due to the use of automatic transmission.

There was also another 2.5L EJ with twin scroll which uses low mount turbo like the FA20. I think it is on a Legacy around mid 2000.

But yeah, Subaru could have just slap a twin scroll as standard on EJ257.

Last edited by dlheman; 09-15-19 at 07:17 AM.
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Old 09-15-19, 07:06 PM   #37
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Default Re: Corsa catback + IHI VF56 twinscroll setup = superior sound

Quote:
Originally Posted by dlheman View Post
Yes, the STI A-Line uses VF48 single scroll turbo.

Could be due to the use of automatic transmission.
That makes sense. They could have detuned the peak torque for the automatic transmission and made the curve look flatter. The A-Lines 350 nm is only 258 lb-ft. The current STI's EJ257 makes a peak of 290 lb-ft at 4,000 rpm. I'm betting if Subaru released a dyno chart that it makes at least 350 nm between 3,000-5,500 rpm.

Below is a dyno from Cobb for the '19 STI (stock vs stage 1). It holds the torque pretty well from 3,000 to 5,000 rpm. I could definitely see 2,800 to 6,000 rpm being over 258 lb-ft at the crank given the whp numbers.

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Old 09-20-19, 04:46 PM   #38
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Default Re: Corsa catback + IHI VF56 twinscroll setup = superior sound

Quote:
Originally Posted by STINick19 View Post
That makes sense. They could have detuned the peak torque for the automatic transmission and made the curve look flatter. The A-Lines 350 nm is only 258 lb-ft. The current STI's EJ257 makes a peak of 290 lb-ft at 4,000 rpm. I'm betting if Subaru released a dyno chart that it makes at least 350 nm between 3,000-5,500 rpm.

Below is a dyno from Cobb for the '19 STI (stock vs stage 1). It holds the torque pretty well from 3,000 to 5,000 rpm. I could definitely see 2,800 to 6,000 rpm being over 258 lb-ft at the crank given the whp numbers.

Image Link
That's it.

Twinscroll turbo is nice on EJ engine.

But I wonder how does an EFR single scroll feels like. Maybe just do a simple upgrade like EFR 6258, equal length manifold and turboback then tune it to suit within the limitation of the stock engine and fueling.
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Old 10-03-19, 12:49 AM   #39
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Default Re: Corsa catback + IHI VF56 twinscroll setup = superior sound

Owen Development / Chevron Motorsport UK stock location turbo (Green) vs JDM STI VF37 twinscroll (Yellow):





Its on build 2.1L engine.

ScoobyNet.com - Subaru Enthusiast Forum - View Single Post - Twin scroll turbo upgrade MD321 billet or SC42 billet or LM420 billet?
ScoobyNet.com - Subaru Enthusiast Forum - View Single Post - Twin scroll turbo upgrade MD321 billet or SC42 billet or LM420 billet?
ScoobyNet.com - Subaru Enthusiast Forum - View Single Post - Twin scroll turbo upgrade MD321 billet or SC42 billet or LM420 billet?
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Old 10-16-19, 08:28 AM   #40
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Default Re: Corsa catback + IHI VF56 twinscroll setup = superior sound

Since this seems to have partially become the twin scroll turbo thread

Some details I found on the VF58 from Giorgio Provinciali at Advanced Sports Engineering Lab.
  • IHI VF58 twin scroll ball bearing turbocharger - ST14411ZR010
  • Used on the S206, S207 & S208
  • Larger turbo inlet ID (5mm larger = 54.2mm)
  • 6 blade compressor wheel
  • Titanium turbine wheel (9 blade)
  • Modern version of the VF42 & successor to VF56
  • Compressor housing designed for DBW throttle body
  • Good for ~350 whp

Quote:
Originally Posted by Advanced Sports Engineering Lab
As many of You may have noticed and many... - Advanced Sports Engineering Lab | Facebook
R205’s dedicated high flow catalyzer and S208’s IHI VF58 can now output a peak of power at about 7200 rpm (rpms are electronically limited to 8250) and an almost-zero lag twinscroll boost which peaks max torque from 2500-2800 to 4800 rpm. This is the ultimate iteration.
Quote:
Originally Posted by Advanced Sports Engineering Lab
VF56 (ST14411ZR000) basically was the DBW version of VF42. It was stock on R205.

VF58 (ST14411ZR010) is stock on s206/207/208.

Both have 9 blades TiAl exhaust wheel, ecc…

VF52 has same compressor wheel diameter size as 56/58 and its compressor is 100% interchangeable over their CHRAs (housings are not)

56/58 are very rare
Quote:
Originally Posted by Advanced Sports Engineering Lab
New gen IHIs like VF49, VF53, VF56, VF58 have a slightly larger turbo inlet and a slightly different compressor angle to better fit new ICs and throttle bodies.

VF42 turbo inlet ID = 49.2mm
VF58 turbo inlet ID = 54.2mm
https://www.youtube.com/v/ZIz1E0qPXbU

VF58:




VF42 vs VF58:








And a repost of the S206 dyno since I found it in a bit higher quality:



VF56:
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