variable vane turbos - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

EZWood · 07-30-2014, 05:04 PM

Why is it that no one has used variable vane turbos for our cars? I'd like t start a discussion on the pros and cons. I have a gt3782v that is currently a giant paperweight. I'm thinking that it would spool relatively early and could avoid excessive egt's with the size of the exhaust housing. What are your thoughts on something like this.

cdrazic93 · 07-30-2014, 05:09 PM

Use the search button. I already started a thread like this.

EZWood · 07-30-2014, 05:12 PM

Quote:

Originally Posted by cdrazic93

Use the search button. I already started a thread like this.

Search doesn't work well on mobile. Would you be kind enough to provide a link?

cdrazic93 · 07-30-2014, 05:23 PM

http://www.ft86club.com/forums/showthread.php?t=57972

blackhawkdown · 07-30-2014, 05:31 PM

when people talk about variable vanes i think about turbine engines. the variable vanes in the t701d, uh-60 blackhawk engines, opens up to increase air and power. it is kept close until a certain power percentage is reach (NG). variable vanes in turbine engines change the angle on how the air is sent to the compressor, it uses the anti-ice start bleed valve to control the amount of air going into the compressor and diffuser. an actual design of such a turbo would make it pretty efficient but it would make the turbo pretty big.

EZWood · 07-30-2014, 06:00 PM

Quote:

Originally Posted by blackhawkdown

when people talk about variable vanes i think about turbine engines. the variable vanes in the t701d, uh-60 blackhawk engines, opens up to increase air and power. it is kept close until a certain power percentage is reach (NG). variable vanes in turbine engines change the angle on how the air is sent to the compressor, it uses the anti-ice start bleed valve to control the amount of air going into the compressor and diffuser. an actual design of such a turbo would make it pretty efficient but it would make the turbo pretty big.

It doesn't increase the physical size by very much. I would post a pic, but I'd have to resize it.

cdrazic93 · 07-30-2014, 11:20 PM

To compress that kind of adjustabikity into a turbo of reasonable size, it gets incredibly complicated very fast. And its a direct coorilation to the price as well. If you already have one like the OP said, then id contact JDL as in the thread i posted they said they were willing to help with a custom setup if i ever wanted to make one.

Poodles · 07-31-2014, 02:16 AM

Expensive and overcomplicated when a twin scroll with a quick spool valve would work nearly as good

Hell, even Honda knew that...

cdrazic93 · 07-31-2014, 05:54 AM

Quote:

Originally Posted by Poodles

Expensive and overcomplicated when a twin scroll with a quick spool valve would work nearly as good

Hell, even Honda knew that...

I never bothered to figure out what a quick spool valve is, care to enlighten me?

DoomsdayJesus · 07-31-2014, 06:13 PM

It's something you really see far more often on truck turbodiesels. I believe Ram trucks with the Cummins Turbodiesel have them as an option.

Poodles · 08-03-2014, 12:30 AM

Quote:

Originally Posted by cdrazic93

I never bothered to figure out what a quick spool valve is, care to enlighten me?

I'm not sure I can link it as it's not a vendor on these forums. Commonly used on Supras and they come right up in google...

1stGenBRZ86 · 08-03-2014, 08:02 PM

quick spool valves close off one "scroll" on a twin scroll turbo until a certain boost pressure is reached. This allows you have a very big turbo with a relatively quick onset of boost.

07-30-2014, 05:04 PM	#1
EZWood BAMF Join Date: Jun 2012 Drives: 13 fr-s, whiteout, MT. 94 ZJ Location: Apache Junction, Az Posts: 1,007 Thanks: 209 Thanked 345 Times in 215 Posts Mentioned: 13 Post(s) Tagged: 0 Thread(s)	variable vane turbos Why is it that no one has used variable vane turbos for our cars? I'd like t start a discussion on the pros and cons. I have a gt3782v that is currently a giant paperweight. I'm thinking that it would spool relatively early and could avoid excessive egt's with the size of the exhaust housing. What are your thoughts on something like this.

07-30-2014, 05:09 PM	#2
cdrazic93 Junior Join Date: Aug 2013 Drives: a car Location: Probably at school Posts: 4,341 Thanks: 3,184 Thanked 2,512 Times in 1,502 Posts Mentioned: 20 Post(s) Tagged: 0 Thread(s)	Use the search button. I already started a thread like this. __________________ "Ah! What music! They could have never imagined, those pioneers who invented the automobile, that it would posses us like this, our imaginations, our dreams. Men love women, but even more than that, men love CARS!"-Lord Hesketh

07-30-2014, 05:23 PM	#4
cdrazic93 Junior Join Date: Aug 2013 Drives: a car Location: Probably at school Posts: 4,341 Thanks: 3,184 Thanked 2,512 Times in 1,502 Posts Mentioned: 20 Post(s) Tagged: 0 Thread(s)	http://www.ft86club.com/forums/showthread.php?t=57972 __________________ "Ah! What music! They could have never imagined, those pioneers who invented the automobile, that it would posses us like this, our imaginations, our dreams. Men love women, but even more than that, men love CARS!"-Lord Hesketh

07-30-2014, 11:20 PM	#7
cdrazic93 Junior Join Date: Aug 2013 Drives: a car Location: Probably at school Posts: 4,341 Thanks: 3,184 Thanked 2,512 Times in 1,502 Posts Mentioned: 20 Post(s) Tagged: 0 Thread(s)	To compress that kind of adjustabikity into a turbo of reasonable size, it gets incredibly complicated very fast. And its a direct coorilation to the price as well. If you already have one like the OP said, then id contact JDL as in the thread i posted they said they were willing to help with a custom setup if i ever wanted to make one. __________________ "Ah! What music! They could have never imagined, those pioneers who invented the automobile, that it would posses us like this, our imaginations, our dreams. Men love women, but even more than that, men love CARS!"-Lord Hesketh

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07-31-2014, 02:16 AM	#8
Poodles Senior Member Join Date: Oct 2013 Drives: 2015 Series.Blue Location: Fort Worth, TX Posts: 1,781 Thanks: 88 Thanked 781 Times in 481 Posts Mentioned: 16 Post(s) Tagged: 0 Thread(s)	Expensive and overcomplicated when a twin scroll with a quick spool valve would work nearly as good Hell, even Honda knew that...

08-03-2014, 08:02 PM	#12
1stGenBRZ86 Senior Member Join Date: May 2013 Drives: 2013 BRZ Location: NYC Posts: 207 Thanks: 110 Thanked 58 Times in 35 Posts Mentioned: 1 Post(s) Tagged: 0 Thread(s)	quick spool valves close off one "scroll" on a twin scroll turbo until a certain boost pressure is reached. This allows you have a very big turbo with a relatively quick onset of boost.

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