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Twin scroll turbos

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Old Aug 31, 2012 | 08:28 PM
  #1  
fasteddi's Avatar
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Twin scroll turbos

Title says it. I though I would start this thread in hopes that some ppl on here have used such a turbo. Pros and con? Educate me as Ive see good articals on them but its in theroy only and not much read "seat time data". Thanks
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Old Aug 31, 2012 | 08:36 PM
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Re: Twin scroll turbos

What is it it that you want to know?

One thing that can be done with a twin scroll is block off half of the turbine and have half the A/R, for quicker spool up. If need be a flapper can be added to the other scroll and open for more flow at higher boost/RPM.
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Old Aug 31, 2012 | 08:43 PM
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Car: 1991 Camaro RS
Engine: Lq4 6.0 SBE s485 turbo E85
Transmission: Fsi th400 stage 4. TSI 5500 st
Axle/Gears: Strange S60 4:10s
Re: Twin scroll turbos

What is the point of using them?

Basically to balance out the ex gasses? Such as how a equal length header works?

Also Ive read that they will preform with a lower AR at low rpm/gass flow and act as a higher AR with more flow?
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Old Aug 31, 2012 | 09:07 PM
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Re: Twin scroll turbos

with ur setup u wont really see a gain with a twinscroll.

most setups have each bank plumbed into one side of the turbine housing
or u would alternate the cyls feeding each side so that each ex pulse would hit the oposite side of the turbine housing say on an inline 4 cyl or stright 6/8

the only advantage to using one on ur setup is u could run a huge ar housing for top end flow and use a quick spool valve to make it spool up like a smaller ar housing

Last edited by project89; Aug 31, 2012 at 09:13 PM.
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Old Aug 31, 2012 | 09:13 PM
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Car: 1991 Camaro RS
Engine: Lq4 6.0 SBE s485 turbo E85
Transmission: Fsi th400 stage 4. TSI 5500 st
Axle/Gears: Strange S60 4:10s
Re: Twin scroll turbos

Ok thats making sence them. I wasent as much looking into getting one of those but there were a few on the net that were interesting and I really got lost on why even use one and when it would be a gain.
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Old Aug 31, 2012 | 10:09 PM
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Car: 89 RS 89 iroc 87 firebird
Engine: 3.1 Turbo/ 355 twin turbo
Transmission: a4 w/ 4500 stall/ a4 / t5
Axle/Gears: strange s60 /w 3:42's
Re: Twin scroll turbos

67mm nuff said lol
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Old Sep 1, 2012 | 05:36 AM
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Car: 1991 Camaro RS
Engine: Lq4 6.0 SBE s485 turbo E85
Transmission: Fsi th400 stage 4. TSI 5500 st
Axle/Gears: Strange S60 4:10s
Re: Twin scroll turbos

T66
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Old Sep 1, 2012 | 07:24 AM
  #8  
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Re: Twin scroll turbos

imports tend to gain a lot from there faster spooling rates but from my experience it wasn't really worth it. that and the older ones had some reliability issues with bearings and such but i'm sure that's all fixed now. but like all turbo's they need good oiling just not too much
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Old Sep 1, 2012 | 08:58 AM
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Re: Twin scroll turbos

Too much better than not enough... LOL
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Old Sep 1, 2012 | 05:42 PM
  #10  
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From: Utah
Car: 89 RS 89 iroc 87 firebird
Engine: 3.1 Turbo/ 355 twin turbo
Transmission: a4 w/ 4500 stall/ a4 / t5
Axle/Gears: strange s60 /w 3:42's
Re: Twin scroll turbos

Originally Posted by fasteddi
T66
technically that t66 is a 67mm turbo lol
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Old Sep 1, 2012 | 07:51 PM
  #11  
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From: Northwest Ohio
Car: 1991 Camaro RS
Engine: Lq4 6.0 SBE s485 turbo E85
Transmission: Fsi th400 stage 4. TSI 5500 st
Axle/Gears: Strange S60 4:10s
Re: Twin scroll turbos

Originally Posted by project89
technically that t66 is a 67mm turbo lol
I know I know Ya got me there.
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Old Sep 1, 2012 | 07:52 PM
  #12  
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From: Utah
Car: 89 RS 89 iroc 87 firebird
Engine: 3.1 Turbo/ 355 twin turbo
Transmission: a4 w/ 4500 stall/ a4 / t5
Axle/Gears: strange s60 /w 3:42's
Re: Twin scroll turbos

have u had a chance to checkout the engine yet?
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Old Sep 1, 2012 | 07:55 PM
  #13  
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From: Northwest Ohio
Car: 1991 Camaro RS
Engine: Lq4 6.0 SBE s485 turbo E85
Transmission: Fsi th400 stage 4. TSI 5500 st
Axle/Gears: Strange S60 4:10s
Re: Twin scroll turbos

Tommorow night dave.. I went to the Ohio St game today. Im a big fan and had free seats.
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