Hello everyone and welcome, in this video
I'm going to be explaining twin turbos now this isn't the place to learn how turbochargers work
So if you don't already know how turbochargers work, I'd recommend checking out my video explaining that. So twin turbos; In this video
I will be explaining two different setups,
one parallel and one sequential, both of which are going to utilize the same size turbo,
Just have two of them, but they're going to use them in different ways. Now,
there's another type out there which uses different size turbos which I will explain in a future video, so
The first and the most simple setup to basically understand is parallel and basically all you're doing is you're having two separate
turbochargers for two separate cylinder banks, so it's almost like you've got two separate turbocharged engines. So here we've got a V6
You can see the cylinder banks, and you've got your two intakes so here's your two turbochargers
Basically, during your exhaust stroke,
you're going to have exhaust come out through these exhaust manifolds
Spin up the turbos, the turbos are going to pull in air, the air will go through the intercooler through the throttle to the intake
manifold, to the cylinders and then repeat that process. So it's just like with a regular
turbocharger the only difference is you've got two cylinder banks, so you split up the work between two turbochargers.
So things to note on parallel is that both turbos are always going to be active for the entire RPM range
Well they may not, say you sized them so that they spool up at a higher RPM, that's fine, but point is they're both
always going to have exhaust flow directed towards them and both turbos are the same size as I mentioned.
Now another type of Turbo setup is sequential
So here we've got a four cylinder engine and basically what happens here is you have one turbo active at low RPM
and then both turbos active at a higher RPM when you have more exhaust flow.
So at low RPM you've only got a single turbo active and here
we have a bypass valve, and this is basically what shuts off this turbo, so if air isn't allowed to pass through here
It's not going to be able to spool up, and it's not going to be able to put any boost through this
Piping so basically what happens is after your exhaust stroke all your exhaust is going to be directed
to this turbo here, and so it's going to spool up this turbo, and then it's going to pull in air
through this intake along this channel, and so it'll send that air
Up here into the intercooler through your throttle into your intake manifold and then into your engine
And then It'll just keep recirculating like that along and then of course out the exhaust here
Now why would you only have one turbo spooling at low RPM?
Well the reason is you don't have that much exhaust so you couldn't
spool up both of these turbos with the limited amount of loss
Exhaust that you're making so you send all of it to one turbo
And that's enough to spool it up and create boost for the engine now at Higher RPM Scenarios
this bypass valve is going to open up
You're going to have a lot more exhaust and so all of that exhaust is going to be directed to both of these turbos
So they'll both be pulling in air, bringing it to the intercooler through the engine and then they'll continue spooling out both
of these turbos, and then finally out the exhaust so
Basically the reason you can do that is because you have more exhaust flow and once again both of these turbos are the same size
So if you have any questions, or comments feel free to leave them below and in my next video
I'll be explaining a twin-turbo setup in which you have different sized turbochargers