[flash]

there is a review of it in the chip shootout article



chips that add fuel, as they all do to one degree or another, can obviously affect mileage. how much depends on which maps they changed. the ECU will return any fuel map other than WOT to stoich within 1/2 second, so part throttle and cruising won't be affected much by any chip that retains the O2 sensor operation.



what generally happens is that when somebody puts in a chip, they start driving harder. the biggest factor in fuel economy is your right foot.



that first 1/4 tanks always disappears faster than the last one

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[Rap]

So the right foot impacts your fuel economy the most? lol So that's wha'ts happening!

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[flash]

lol - yeah - it appears that there is a direct connection between the pleasure center of the brain, the testicles, and the right foot. real bummer. unless of course, you're into yoga and pain.

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[speedysprocket]

I can drive very conservatively in an effort to get my mileage up. I have a vacuum gage and never go below 10 inHg when accelerating and such, but just can't get the mileage any high. I almost saw 25 mpg purely highway cruising in one day.

Kind of off topic, but I haven't had a charcoal canister in my car for a while. I just have a filter on the hose at the solenoid and valve that control the engine vacuum to the canister. Could no charcoal canister cause my substantial loss in economy?

Oh, and I did read that article, but didn't really pay attention to the names so I didn't realize I already had a good chip... Thanks for pointing that out.

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[flash]

there is a vacuum line going there. where does that go now? a vacuum leak will absolutely affect fuel economy. what does your gauge read at idle? it should be about 17



why did you remove the canister anyway? those fuel vapors must reek.



by the way, it's a part of the emissions control system, and illegal to remove in any state, whether they inspect you in your state or not.

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[flash]

p.s. - when i do finally get around to developing the new chip (likely later this summer), which will be a part of a complete system, i will post what each brand of chip does, and how it does it. i'll point out any areas of concern as well.

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[speedysprocket]

[quote name='flash' timestamp='1403882881' post='159122']

there is a vacuum line going there. where does that go now? a vacuum leak will absolutely affect fuel economy. what does your gauge read at idle? it should be about 17



why did you remove the canister anyway? those fuel vapors must reek.



by the way, it's a part of the emissions control system, and illegal to remove in any state, whether they inspect you in your state or not.

[/quote]

The hose that went from the control valves to the canister is gone and there is now a filter to keep junk from going into the intake.

Vacuum is very good. 17+ at idle. Those valves don't open at idle though. Highway cruising, the gage will fluctuate 1"Hg or less as the control valve is pulsed.

The nipple on the canister broke when I was taking it off a while ago, and when I've tried to find a replacement, guys who part these cars just throw those canisters away, so they didn't have any.

Never smell gas.

And the car is registered in Connecticut; cars over 25 years old don't go through emissions there, nor have any sort of inspection.

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[flash]

well, i would cap off the vacuum line. when you step on it, that must result in a vacuum leak.

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[speedysprocket]

The DME pulses the solenoid valve to regulate air flow through the charcoal canister. And that canister was free flowing too. I've driven the car with that valve unplugged, so the solenoid never opens, and I had no change in economy..

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[flash]

that's essentially a closed system. there are 2 tank vent valves (look at the diagram on the hood) regardless of what you think might be going on, if a vacuum line is not plugged, at some point the valve connected to it would open and create a leak. otherwise the valve would be useless. plug that thing up. i'll go down and look at it, to see just how that system works, but i think you have a leak there. it could only be a small one, similar to what the ported vacuum at the throttle body would be.



enough about vacuum, and back on topic, it is very easy to lose fuel economy and not realize what is causing it. the difference between half throttle and full throttle is 4 times the fuel use. a few seconds at full throttle is like minutes at cruise. it's hard not to squish it when you put in a chip.



side note: tips don't get the economy that manuals do, to the tune of about a 15% loss.

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