Explain this turbo setup to me.

[enkeivette]

It looks like the turbo is sucking air in from the intake manifold, and then also pressurizing the intake under the carb (which makes sense), but why is the air intake feeding from under the carb?!

And what is that extra pipe sticking out of the manifold, is it for a BOV?

 

[clutchdust]

I really have no idea but my guess is that what you're seeing is actually a single piece that bolts on to a conventional manifold. The carb baseplate is separated from the manifold runners so that the turbo does suck through the carb and then blow it into that inlet at the back of the contraption. Can't even guess on the pipe.

 

[TimAT]

I've seen that system before someplace. The air/fuel is drawn thru in the rear (side of the turbo) and pressurized, then fed into the manifold. That's the looped pipe in the foreground of the picture.
Seems like a semi-bad idea to me- if the turbo loses a bearing and makes a spark, it's full of "supposedly" a correct for burning fuel/air mix.


KABOOM!!

 

[mrvette]

I've seen that system before someplace. The air/fuel is drawn thru in the rear (side of the turbo) and pressurized, then fed into the manifold. That's the looped pipe in the foreground of the picture.
Seems like a semi-bad idea to me- if the turbo loses a bearing and makes a spark, it's full of "supposedly" a correct for burning fuel/air mix.


KABOOM!!

Yup, many earlier turbo setups, sucked air/fuel through carb, then into engine....and yes, KABOOM was fairly typical....

I don't understand how in hell they manage to pressurize through the carb either, without blasting the fuel outta the carb....something special surely....

:surrender:

 

[wickd]

That looks like an old draw through system, the turbo sucked through the carb and blew the air/fuel mix into the intake manifold. The extra pipe coming off the exhaust manifold would be for a waste gate to dump some exhaust pressure to control boost. My setup is a blow through system where you pressurize the carb, quite similar to a centrifugal carbed blower system. You have to seal all air holes in the carb and boost reference the fuel regulator so it always keeps fuel pressure above the pressure in the carb.

 

[enkeivette]

I guess that makes sense. But how is it not just sucking in the very air that it is blowing in?!

 

[enkeivette]

Nevermind, I understand now. The carb pad has two separate areas in it. It actually seals off the underside of the carb, sends that air through the turbo and the turbo outlet pressurizes the manifold directly. So the turbos are pressurizing the fuel mixture too! That does sound dangerous. But not too dangerous for me to try. Hahaha.