I'd like to know more about the "throttle plate bypass opening" as I call it, in the throttle body of my 2.0l Nubira. It's the smallish opening that sucks in air on the right side above the throttle plate. It seems rather restrictive to me. From what I can tell, the throttle plate moves a considerable about before it actually allows any additional air past into the intake plenum(?)/manifold. I'm wondering about the benefits or problems boring the hole out would cause. I have a new Dremel kit, an unsteady hand, patience, and some free time.
My thoughts so far is that if removing the expansion box resonator and shortening the path the air has to travel improved the responce and performance so far, enlargening the little hole has to do something, especially if at normal driving speeds the throttle plate is still closed. However, I don't know if this will cause too much air into the engine and/or ruin the air-fuel mixture, or what the reasons for the hole being as small as it is are.
Has this been done before, and does anyone have advice or stern warnings to share? I can take pictures of the opening if needed.
throttle body modification - bypass opening too small?
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- Posts: 11
- Joined: Sat Mar 05, 2005 6:36 pm
- Location: Georgia
i didn't completly understand what you said about the bypass and bore thing so i will give my opinion based on what i did understand.
did you mean that little hole where the air goes through when the throttle plate is completly closed??
that hole leads to the Idle Air Controller which controls how much air the engine sucks in durring idling so the hole is just a passage to the real controller here.
in other words; any mods to the port won't affect the car... the IAC is the one responsible for the amount of air regardless of the port's size. if you made the port bigger so that more air can go in then the AIC will close a little bit to compansate for the added air.
also if you drill too much you will mess the AIC's seat and it won't close properly and cause you many idling speed problems, fuel consumption and overheating so you are better off not doing this.
as for bypassing the Resonator... it will reduce the air restriction indeed, i personally did that and it improves the car's response for sure.
as for the stock air box... people say it is restrictive too so if you got a CAI it will make your car even more responsive.
for best results: take off both your OEM air box and resonator and replace them with a CAI but make sure to extend the intake pipe into the hole which the OEM air box used to sit on and mount the cone filter in the wheel well. also pop out the fog light cover in the fender so that you get a continous supply of cold air.
MMamdouh
did you mean that little hole where the air goes through when the throttle plate is completly closed??
that hole leads to the Idle Air Controller which controls how much air the engine sucks in durring idling so the hole is just a passage to the real controller here.
in other words; any mods to the port won't affect the car... the IAC is the one responsible for the amount of air regardless of the port's size. if you made the port bigger so that more air can go in then the AIC will close a little bit to compansate for the added air.
also if you drill too much you will mess the AIC's seat and it won't close properly and cause you many idling speed problems, fuel consumption and overheating so you are better off not doing this.
as for bypassing the Resonator... it will reduce the air restriction indeed, i personally did that and it improves the car's response for sure.
as for the stock air box... people say it is restrictive too so if you got a CAI it will make your car even more responsive.
for best results: take off both your OEM air box and resonator and replace them with a CAI but make sure to extend the intake pipe into the hole which the OEM air box used to sit on and mount the cone filter in the wheel well. also pop out the fog light cover in the fender so that you get a continous supply of cold air.
MMamdouh
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- Posts: 11
- Joined: Sat Mar 05, 2005 6:36 pm
- Location: Georgia
OK, thanks mmamdouh. I didn't know what was behind the hole, so you answered all of my questions.
I removed the resonator a month or so ago and kept the stock airbox. However, I gutted it (the louvers and tunnels) and enlarged the openings to make it as free flowing as possible. I would use the cone filter set up, but I didn't care to waste my new "regular" K&N filter, and the airbox already made it easy to suck in cool fender air.
I removed the resonator a month or so ago and kept the stock airbox. However, I gutted it (the louvers and tunnels) and enlarged the openings to make it as free flowing as possible. I would use the cone filter set up, but I didn't care to waste my new "regular" K&N filter, and the airbox already made it easy to suck in cool fender air.