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Underbody braces, turbos and more!

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PostPosted: Sun Sep 11, 2005 1:54 am 
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Joined: Wed Sep 07, 2005 12:23 am
Posts: 17
Location: Edmonton
How much of an effect will the cleanliness of the air filter really have on the efficiency a fuel injected engine? For carburetted engines, I can see how a plugged filter would act like a choke, resulting in a richer air/fuel mixture and greater fuel consumption. However, in a fuel injected engine fuel input is controlled by the ECU based on engine sensor readings. The MAP sensor cannot tell the difference between manifold vacuum generated by a partially closed throttle and that generated by a restricted air filter, and the ECU will respond to higher vacuum by calling for less fuel. If this is not sufficient to correct the rich condition, the O2 sensor will respond accordingly, providing a further signal to the ECU to inject less fuel. Have I missed anything?

Of course, a dirty air filter would still reduce power, but with metro air filters among the most expensive on the shelf, is there any reason to change them before the power loss is noticeble?


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PostPosted: Sun Sep 11, 2005 4:01 pm 
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Joined: Thu Feb 12, 2004 11:30 pm
Posts: 1706
Location: Rivendell
You are assuming that all EFI suzukis have O2 sensors, which is not accurate, and also that the O2 sensor is a primary sensing element.

Which it is not. The O2 sensor is used as a secondary "fine tuning" tool in the Suzuki engine management.
I take your point on teh sir filter though and agree with you.
What you are saying is accurate, the MAF sensor will be advising the computer how much air flow is going on, the ignition sensor advises the computer what rpm is happening, and the computer will be metering injection on these two primary parameters.

In this case, a clogged air filter is only going to act like performance limiter, or a smaller bore air intake....

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Understeer is when you hit the wall with the front of the car and oversteer is when you hit the wall with the rear of the car.HP is how fast you hit the wall, torque is how much you push the wall out.


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PostPosted: Tue Sep 13, 2005 1:49 am 
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Joined: Thu Feb 03, 2005 7:00 am
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Location: Coquitlam, BC
Just buy a K&N and you dont have to think or worry about it.

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" Only qwall is thinking about what's in my pants."


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