Is this a Twin Scroll VNT turbo? - Alfa Romeo Forum
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Is this a Twin Scroll VNT turbo?

I know we've talked about how to increase boost response and how early can we make boost before on here, may be this new BorgWarner twin scroll VNT (I think its VNT) will be an option for the tuning community soon.
https://www.youtube.com/watch?v=J06nj5-B_AE

also found this: http://www.turbos.bwauto.com/tools/d...nt&r=530&d=623
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They usually only stick twin scroll turbos on engines with six cylinders or more, so they don't usually suffer from a lot of lag because of their displacement. It looks like a good idea but Borg Warner turbos that I've seen have been no where near as good as the Garrett equivalents. I think they need to man up and make VNT turbos for petrols combined with a waste gate. Yes it would cost more but why do things by halves
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Useless on a diesel...
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Useless on a diesel...
VNT turbos are only for diesels.. Petrols operate too hot for them..

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Petrols operate too hot for them..
Porsche disagrees about that... since 2007.
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Quote:
Originally Posted by jbsmith1 View Post
I know we've talked about how to increase boost response and how early can we make boost before on here, may be this new BorgWarner twin scroll VNT (I think its VNT) will be an option for the tuning community soon.
https://www.youtube.com/watch?v=J06nj5-B_AE

also found this: http://www.turbos.bwauto.com/tools/d...nt&r=530&d=623
The two are not the same, but come to the same effect: allow the effective aspect ratio (A:R) of the turbo to be altered as conditions change:

The youtube clip expains variable twin scroll - where you alter how much exhaust goes into only one scroll (faster spool up) or go into both (sustained boost at high RPM).

The Borg Warner pdf explains potential benefit of Variable Turbine Geometry (VTG is Borg Warner term to the same Garrett refers to as VNT) with fixed twin scroll as opposed to fixed single scroll.
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cheers all, I learn something from you guys everyday.
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Man i'd like to have an efr turbine on my delta for the 'big' turbo....


Everone on performance engines is switching to efr if possible right now. They are a work of art, makes the garrett gtx series look like something from the past.....
Garrett only do rnd on the turbines... borgwarner reworkes the complete case,turbines,shafts,wastegates everything.... those things have a verry wide effective range allow for higher boost as garret eqivalents and spool faster...


This however is a variable 'inlet' Twinscroll Turbo... it's body looks like an efr..... however twinscroll turbos are mostly big, the smallest efr is rated for 300-400bhp (petrol)

Those inlet designs are simmilar to quick boost valves, they reduce turbine inlet diameter (smaller innlet greater gasvelocity)
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