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ZETEC Performance (2000-2004) The place to chat about any 2.0L Zetec engine performance, tuning and exhaust related upgrades.

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Old 06-27-2019, 10:32 PM   #1
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TB replacement?

Hey guys I want to boost my mpg on a 2000 ZETEC with 240k+ what size TB can I go up to, and any idea how much? Also how do I find a CAI that fits so I can get rid of the noisy lunch box under my hood, (hell it makes more noise than my exhaust)?


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Old 06-29-2019, 02:50 AM   #2
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Changing TB on one of those will not increase mileage and engine likely too old anyway, no ring seal from worn engine is what lowers mileage.

The zetec TB is a weird one that actually chokes the intake at low throttle openings (below about 1/3 or so) on purpose and the fuel map is matched to how that choke action works, modding to make for more air flow makes the car tend to bog pulling up off a stop unless you work the software over, or a tune. BTDT.

The stock airbox makes little noise unless the snap-in resonator block to driver side has been removed, a CAI likely will make more noise than the box. Unless it is totally baffled and then defeating the purpose doing that.

Of course, yours and do what you will.
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