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Gas Mileage SUCKS

Old 07-08-2008, 11:52 AM
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Default Gas Mileage SUCKS

I don't know if I it's beacuse I am beating on it or what, but my last two tanks have netted me ~17mpg each. I got my car to run as lean as it can at PT without stumbling though even now it somtimes does, and its pig rich in boost but I didn't think that would kill my mileage so bad. I'm busting my *** to be able to get 25mpg with it but it does not look like its gonna happen. ----.
What else in a tune would help increase mileage? I plan on injecting water to reduce the amount of fuel needed at WOT but thats just a smal percentage of the time. Should I grab a det-can and try to run PT ign timing on the knife edge of safety?
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Old 07-08-2008, 12:02 PM
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Default Re: Gas Mileage SUCKS

what kind of combination is this? may have something to do with head/block combitnation.
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Old 07-08-2008, 04:22 PM
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Default Re: Gas Mileage SUCKS

Lets put it this way, prior to the turbo, the car was getting ~24mpg mixed driving, 25mpg hwy at best. Now it dropped almost ten points even if I baby it... probably because my tune is missing something. The car has a 255 walbro and 55# injectors.
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Old 07-08-2008, 04:23 PM
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Default Re: Gas Mileage SUCKS

Oh, and its a straight up M50tu 2.5L
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Old 07-08-2008, 07:13 PM
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Default Re: Gas Mileage SUCKS

theres the problem, its not a honda! but even though all you did was upgrade injectors or what, what was all your upgrades prior to the tune? i would say must be timing way the ---- off. i know i used to get around 15mpg in my honda because i was almost a tooth off but it still ran.
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Old 07-09-2008, 10:28 AM
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Default Re: Gas Mileage SUCKS

Um... the engine is untouched all I did was "slap" a turbo kit on it over the course of months. Timing is stock, it HAS to be something in my tune that I am too newbish to be aware of. Can the fact that my injectors take a lot longer then stockers to open be throwing off my tune even though my AFR's are correct?
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Old 07-12-2008, 04:39 PM
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Default Re: Gas Mileage SUCKS

Originally Posted by ichbinsobose
I don't know if I it's beacuse I am beating on it or what, but my last two tanks have netted me ~17mpg each. I got my car to run as lean as it can at PT without stumbling though even now it somtimes does, and its pig rich in boost but I didn't think that would kill my mileage so bad.
Layng hard into the gas pedal has a noticeable effect on your mileage, but not that bad. It's hitting your brakes that uses the gas - you expend gasoline to move the car and instead of moving the car you jam on the brakes, thereby wasting all that energy.

#1 rule on the ecomodder or hypermiler sites is that the biggest change in mpg cones from how you drive.


As far as pure highway cruise... how much timing are you running part throttle, and what is your bore size?
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Old 07-12-2008, 05:30 PM
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Default Re: Gas Mileage SUCKS

like the beloved ls i storke myself to the tune of 84mm
ill get timing figures in from my laptop in a bit.
i am discovering more and more maps in tunerpro so i think its just a matter of time
i just found the target afr maps for idle and fixed 85% of my idling issues :1
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