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Old 03-11-2003, 02:28 PM   #1
DrBoy01
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Default ProECM/TC2 Questions-- Mileage and Emissions

DISCLAIMER: This is NOT about the HP/torque performance of either chip brand. That issue has been beaten to death by several threads and I would like for it to not be discussed in this one.

Recently I've come very close to buying a ProECM or TC2 v2.7 for my 02 2.5 RS 4EAT. The only issues keeping me from buying one is the question as to whether installing a chip will decrease my mileage and increase emissions.

It has already been established that both chips act to increase ignition timing. Is there a correlation between an increase in timing and a decrease in mileage? If so, would the increase in timing be offset by adding 91 or 93 octane gas, as both chips require? If you have a chip in your NA Impreza, how has your mileage been affected?

What about emissions? If the timing is increased, would I be less likely to pass my states' emission test in a year or two? If you have a chip, what have your experiences been when you pull into the DMV or a private inspection shop to get your emissions tested?

Thanks in advance.
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Old 03-11-2003, 04:20 PM   #2
DanzBorin
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actually in this case, the increase in timing will increase your gas mileage if you don't drive too fast... Just like most any other perf. mod...
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Old 03-11-2003, 05:17 PM   #3
joefocker20
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Your car is also emissions exempt for 3 more years..
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Old 03-11-2003, 06:51 PM   #4
scoobiejosh
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An advance in timing should increase gas mileage. A decrease in mileage suggests that it also adds more fuel which hurts performance unless you have a lot done to the car. As in along the lines of heads and cams.
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Old 03-11-2003, 08:11 PM   #5
joefocker20
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Im not sure if my Intake or my PROECM causes mycar to run more rich, I have a VERY sooted exhaust..
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Old 03-15-2003, 04:38 PM   #6
DoorKnob
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With my TC2, my mileage is almost exaclty the same.
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