Has anyone tried removing the restrictor plates from the intake manifold? They are supposed to tumble the air at low RPMs and then open up at high. A buddy of mine is a Subaru junkie and he says Subaru tuners do it all the time. It gives them more air flow on the low end and he claims more power.
Removing air intake restrictor plate for more power.
ottomobile
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Has anyone tried removing the restrictor plates from the intake manifold? They are supposed to tumble the air at low RPMs and then open up at high. A buddy of mine is a Subaru junkie and he says Subaru tuners do it all the time. It gives them more air flow on the low end and he claims more power.
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it should help. if you're getting more airflow then it has to help. but not just power, fuel economy too.
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107 Posts
Ok....I have just been told there is a set of butterflies in the manifold and if you take the restrictor plates off then you would have all sorts of trouble...
Maybe a little different with the design of the Subaru's, not sure how they do it but from what the dealer has just told me it would be a very bad idea.
Maybe a little different with the design of the Subaru's, not sure how they do it but from what the dealer has just told me it would be a very bad idea.
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8,881 Posts
So you are willing to live with a limit......
A "restrictor plate" would be by definition be a limit of sorts.Have you seen the thin slot the air has to come through at the very front of the car?
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I reckon they said it was a bad idea cause if something goes wrong, your not covered...
You can see pictures of the flapper doors here: http://www.allpar.com/mopar/world-engine.html
Here's a quote from AllPar:
Here's a quote from AllPar:
Since the engine and computer are designed to use them I don't think you'd get too much extra power in the low-end by eliminating them. At full throttle, they aren't going to restrict you anyway, just keep the rpms up over 3200 and you've essentially removed them without the actual hassle.
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I seldom ever reach 3200 RPM.
the computer does keep track of it. the "restrictor" plate in our engines is a computer controlled valve. removing it will cause problems.
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If you take out the butterfly plates and leave the rod the computer would never know the difference.
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we are all talking about the plastic piece from the front grill going over the battery into the air box right??
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No. We are talking about where the air intake meets the intake manifold. The black plastic on the front of the engine coming from the air box splits into four ports. Each of thos four ports has a restrictor plate. At low RPMs two of the plates are closed. This is supposed to help feed the engine by tumbling the air. At 3200 RPMs the plates open. I want to know if removing the plates all together will increase power by increasing air flow.
Well that it is not a tough one. These restrictors are there only to help the engine's torque on low rpm's and that is why after 3200 are opening.Since the 16 valve motors came up the problem was and is that in low rpm's the engine cannot produce enough torque as the 8valve engine. That is very deep technical to explain why. Anyway scientists found that if they restrict the inlet air at low rpm's then they have more torque on low rpm's then they open to let the engine breath more easily on high rpm's. Now in more complex systems like vvti or double vanos etc are cooperate with the opening and closing the valves and the timing and how long.... blah blah...
I hope i was clear enough.
I hope i was clear enough.
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I can't even believe that I am reading this. THEY ARE NOT A RESTRICTOR OF ANY KIND, IN ANY WAY, SHAPE, OR FORM.
They are actually designed to tumble the air below 3200 rpm, which by design will create more torque. Torque is what gets your vehicle moving.
Above 3200 rpm, they open fully to allow maximum air flow. More air at higher rpms will net more horsepower.
Removing it will actually make you lose acceleration, and cause fault codes to set.
They are actually designed to tumble the air below 3200 rpm, which by design will create more torque. Torque is what gets your vehicle moving.
Above 3200 rpm, they open fully to allow maximum air flow. More air at higher rpms will net more horsepower.
Removing it will actually make you lose acceleration, and cause fault codes to set.
I couldn't agree more with you Idahopatriot nuff said they sure aint restrictors
but in order some members are understand some words better 'sometimes' i went with the flow.
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254 Posts
Just put on a home made intake system with a K&N like mine instead, works great for me, little more power, little better response, more throaty engine sound at high RPM's
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