Turbo Vacuum
Fireinthesky28
10-05-2002, 05:52 PM
Yeah....So what is it?
Namely, what could cause such a phenomon, I know about air dynamics, pressure, how a turbocharger works. I just dont understand how pressurized air could lead to air being taken out of the cylinders, how does this happen??
Thanks:)
Namely, what could cause such a phenomon, I know about air dynamics, pressure, how a turbocharger works. I just dont understand how pressurized air could lead to air being taken out of the cylinders, how does this happen??
Thanks:)
Fireinthesky28
10-06-2002, 06:14 PM
Anyone?
ivymike1031
10-06-2002, 09:07 PM
Never heard of it. Where did you hear of it?
Fireinthesky28
10-06-2002, 10:24 PM
I was lookin through some catalogue, advertising spedometer/tachometer/etc., one of the gauges was a turbo gauge, which was "Equipped to show turbo vacuum", and the gauge started at 20, 10, 0, 10, 20, etc. starting with vac and then moving to boost.
Maybe it is just fabricated, who knows?
Maybe it is just fabricated, who knows?
ivymike1031
10-06-2002, 11:31 PM
I suppose you could see a slight amount of manifold vacuum if you went from idle to WOT suddenly... otherwise that gauge should read above zero most of the time, right?
Fireinthesky28
10-06-2002, 11:32 PM
Yea, that sounds about right...maybe just a waste of plastic and paint
Gasoline Fumes
10-07-2002, 01:36 AM
Originally posted by Fireinthesky28
"Equipped to show turbo vacuum"
If that said "equipped to show turbo boost and manifold vacuum," it would make more sense. When the throttle is closed, there will be vacuum in the intake manifold. When the throttle is open and the turbo is making boost, there will be pressure in the intake manifold. The gauge will display both. Don't most boost gauges show manifold vacuum?
"Equipped to show turbo vacuum"
If that said "equipped to show turbo boost and manifold vacuum," it would make more sense. When the throttle is closed, there will be vacuum in the intake manifold. When the throttle is open and the turbo is making boost, there will be pressure in the intake manifold. The gauge will display both. Don't most boost gauges show manifold vacuum?
Grendel
10-07-2002, 02:05 AM
Originally posted by Gasoline Fumes
If that said "equipped to show turbo boost and manifold vacuum," it would make more sense. When the throttle is closed, there will be vacuum in the intake manifold. When the throttle is open and the turbo is making boost, there will be pressure in the intake manifold. The gauge will display both. Don't most boost gauges show manifold vacuum?
The gauge (stock) in my car shows both vacuum and boost... all the aftermarket gauges I have seen show the same thing...
-Grendel
If that said "equipped to show turbo boost and manifold vacuum," it would make more sense. When the throttle is closed, there will be vacuum in the intake manifold. When the throttle is open and the turbo is making boost, there will be pressure in the intake manifold. The gauge will display both. Don't most boost gauges show manifold vacuum?
The gauge (stock) in my car shows both vacuum and boost... all the aftermarket gauges I have seen show the same thing...
-Grendel
ivymike1031
10-07-2002, 09:15 AM
Originally posted by Gasoline Fumes
If that said "equipped to show turbo boost and manifold vacuum," it would make more sense. When the throttle is closed, there will be vacuum in the intake manifold. When the throttle is open and the turbo is making boost, there will be pressure in the intake manifold. The gauge will display both. Don't most boost gauges show manifold vacuum?
that's right... I don't know what I was thinking... if the manifold didn't have vacuum at closed throttle, there'd be no controlling the engine.
If that said "equipped to show turbo boost and manifold vacuum," it would make more sense. When the throttle is closed, there will be vacuum in the intake manifold. When the throttle is open and the turbo is making boost, there will be pressure in the intake manifold. The gauge will display both. Don't most boost gauges show manifold vacuum?
that's right... I don't know what I was thinking... if the manifold didn't have vacuum at closed throttle, there'd be no controlling the engine.
Fireinthesky28
10-07-2002, 11:10 AM
Of course...I was thinking cylinder pressure for some odd reason when I originally posted this, but the vacuum in the manifold makes sense...niec.:)
Automotive Network, Inc., Copyright ©2026