Vacuum in intake manifold
Vacuum in intake manifold
does anyone know exactly what the little vacuum controlled valve does in the intake manifold?
i read something about shorter and longer intake.
I experience some difference in intake pressure during the rpms.
when i am just past 4500 rpm the intake air pressure goes from 0,5 bar to 0,6 bar and then goes back to 0,5 till i get above 5500 rpm then i get 0,6 bar again.
has this something to do with the little valve in the intake manifold?
would it be good to tie the valve to always open? or closed?
hi
does anyone know exactly what the little vacuum controlled valve does in the intake manifold?
i read something about shorter and longer intake.
I experience some difference in intake pressure during the rpms.
when i am just past 4500 rpm the intake air pressure goes from 0,5 bar to 0,6 bar and then goes back to 0,5 till i get above 5500 rpm then i get 0,6 bar again.
has this something to do with the little valve in the intake manifold?
would it be good to tie the valve to always open? or closed?
Dark Samurai
18-03-2021, 01:40 PM #2That's your ACIS (acoustic control induction system) which means there's a little valve which will make your inlet manifold runners longer under low rpms, but when you get above, the ACIS valve opens and makes the runners vert short which is better for higher power, whereas having them longer at low revs gives better low end torque. It's called ACIS because the sound changes a fair bit as you know...
Dark Samurai
20-03-2021, 09:07 AM #4I really don't know mate. Sorry. I'd assume it'd still be as effective though
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