So we are looking at two Borg-Warner efr turbos both twin scroll One
external Gate one internal gate
so...
realistically the difference in these turbos is
just the turbine housing these are two different sized turbos.
So this is a 6758 it's got to be one frame compressor cover and then
the other one here 7672 B2 frame compressor cover so they do look
quite a bit larger and it's got the anti-surge, but what will looking
at mainly today is the turbine housings so traditionally twin-scroll
turbine housings with internal wastegate have been pretty.
It's only when born and brought these out that it started to become.
Mauvaise easy to fit aftermarket thing twin-scroll internal Gate
turbos, because the turbine housings on Deezer at times too good so to
look at these two turbine housings the big differences this one is a
hell of lot narrower because we haven't got any of the actuation or
flapper valve for the internal that is one advantage of the external
Gate turbos.
They are lot more compact, but obviously it's somewhere in your engine
by using any manifold going to have to have to external wastegates,
which takes a lot more room and quite a lot of plumbing involved in
that so if you can have an internal wastegate turbine housing work
well like these do they can be a big advantage because it might be
much longer unit.
Because of how wide that turbine housing is but it does say view all
that hassle of having to have to external wastegate.
She's got worn actuator arm here working this flat valve.
Just undo this you can actually see the actuator arm move the fuck
valve or move.
So what we got here is the wastegate flat now, so owner can turbo
off-the-shelf turbo for your standard.
It will almost always be internal wastegate still almost always have
this this flat valve arrangement and to be fair.
They were pretty good.
So the only need one actuator control that we don't need a big fancy
external wastegate standard external plumbing these or a real big
advantage.
For setup swear you're not looking at high horsepower and not looking
at high boost these on our z28.
It's really well as a good fastroad Carter any of the hassle of
external wastegate all the benefits of twin-scroll.
So you can see down in here as the gas comes out of the manifold into
the turbo.
It will go down into the turbine housing and spin the wheel now when
we reach your desired boost pressure and we want to delete some of
that boost pressure or what we can do is we can open that valve and
you'll have to shoot off Both Sides Now one thing that's really cool
about the VFR twin-scroll turbo housing the gas actually goes past
once one scroll into the other two actually slipped down inside here
through the back of the other one and then actually comes out in the
same in the same vowel.
We look again Dan here.
We can see that the the twin towers actually split right up until the
van which is definitely the best way to do it.
See you at the gas comes out and straight out of here and it does that
both sides and said this one that's underneath the other scroll to
actually has to come all the way around now, but it still work really
efficiently see other thing to mention.
I miss turbo which is an option on most efr pretty sure it's an option
also on all this now is the option tab aluminium.
So this is a lot lighter.
I don't know if the top of my head, but I think it's over kilo lighter
aluminium one which one you talking about it doesn't really make that
much difference to at the call curb way, but it does do is it was a
lot less stress on her a welded tubular manifold the alloy cause a lot
better in that respect the usually not much more expensive now even I
did used to be when they still pretty new but nowadays these are
actually a lot.
A lot lighter for not a lot more money the only downside is you do
have to walk to call them with the cast iron with the cast iron.
Core you actually can get away with not running the water cooling even
with the ball bearing but the aluminium cause do happy water called.
But realistically you should be what I call them anyway.
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