Bad mpg's

[DustinH]

Thinking about going back stock on exhaust unless i can find a way to get some mpg's back.


Running Obx lt's No cat's at all with some f**ked up fart can for a muffler.
Im getting ready to redo it all.

Would putting a cat on it bring the mpg"s up?

If not then stock we go lol

[rfletch]

If you go stock sell me your headers

[DustinH]

Sure thing....Will put em on here if that happens

[Taranis]

If you want better MPG change the way you drive. Opening up your exhaust flow does not decrease your MPG. What decreases your MPG is you mashing your foot to the floor to hear your exhaust or to feel the performance.

[360jeepboy]

^^^ agreed. I have full exhaust, intake, nitrous, and I still get the same MPG as stock.

[Chaos]

What do you define as "bad"

[deprydation]

Yeah, that's one of the biggest things with mods. We all enjoy them so much but it's when we start to love feeling the power and everything that our MPG's die. Also, you might wanna check out your spark plugs, injectors, and anything to do with your fuel/ignition system. If you're losing MPG you could be suffering from something besides an aftermarket right foot.

[Taranis]

This is true. Getting behind on the regular maintenance can definitely adversely affect your MPG over time. Also make sure your tires are inflated properly.

[DustinH]

Im about to check everything again soon. The car has been maintained from the day i got it. Lol aftermarket foot. Every now and then i'll push it. But ive noticed either way i drive, it sucks. I can have a full tank....Drive across town and back and it be pretty close to half.

Would the cat have anything to do with it at all ?

[Chaos]

What kinda mpgs are you seeing?

[BrianJ]

You've got headers, no cats, spacers, intake, etc.etc...

You need to tune the car. Fuel AND ignition changes will drastically help your MPG...

[DustinH]

maybe 10 if im lucky ...

its hard to tell though. I'll look into the tuning.
How hard would that be?

[haladafs]

ya seems like mpgs went way down too, could just be bad gas or something idk, going to order some new plugs tom. hopefully buy some new mobil 1 and a filter hopefully mpgs are back to the usually mid 20s

[Daxenth]

on another note, is there a way to tune without an FiC?

[haladafs]

try changing filter and plugs yet?

[360jeepboy]

It can also be the gas you use. If you have Ethanol in your fuel you will get worse MPG then if you don't. Also cheap gas, or lower octane fuel will get worse mpg.

[deadninja]

Originally Posted by 360jeepboy

It can also be the gas you use. If you have Ethanol in your fuel you will get worse MPG then if you don't. Also cheap gas, or lower octane fuel will get worse mpg.

Wait. Isn't Ethanol supposed to have high octane levels? More octane = more power = better fuel economy?

[360jeepboy]

Not exactly true. Yes a car that is tuned to run on E85 will get more power then on the dino juice, but it will get shitty MPG.

Gas with Ethanol in it will not help your gas mileage, it will hurt it. The only reason places put ethanol in the fuel is because it is cheaper. So they don't "have" to charge you as much at the pump, so you feel like you are saving money, but your really not because you are getting worse MPG.

This might help.

The Effect of Ethanol on Gas Mileage | eHow.com

[Clovisman]

Deleted.

[DustinH]

After I did the exhaust and put the converter back on in with the full system im getting better mpg...Still not what it feels it should be, but good enough.

Thanks

[Chaos]

Only wusses measure it in MPG. I measure in GPM! Bwhahaha

[DustinH]

Haha

Runs a hell of a lot better too.

[360jeepboy]

I can't wait until Hack comes out with a handheld. A tune sounds about like what you need.

[DustinH]

I was thinking the same thing.
Looking into the Aem fic...
I don't have a clue how to run it or program it if i was to get one.

[Ballfade]

lmao I dont even look at the gas anymore (Unless on long journey), I just watch for when the yellow light comes on. I didn't know what my mpg was when I was stock, god only knows what it is now haha.

[deprydation]

Originally Posted by DustinH

I was thinking the same thing.
Looking into the Aem fic...
I don't have a clue how to run it or program it if i was to get one.

Make sure you get it from RRE and buy BrianJ's harness along with it or you'll play hell trying to get it to work right. I think it comes with installation instructions and everything you need to install it and take it to tune. Unfortunately the FIC only gives us some functionality over the ECU on this car. Stupid Mitsubishi didn't want us to reprogram these cars...for some odd reason...

I think part of the problem with us is that we have so small of a tuner community for this that nobody besides Hack has really tried to break into this thing and decode the guts and change crap around. With the Evo community you probably had about 20 companies instantly wanting to crack that ECU and pull all the power out of they could. If those companies only realized what our generation of Eclipse is really capable of even being FWD they'd probably change the tune a bit.

[DustinH]

Thanks!
Im going to look into it and see if i can tune it.

[BrianJ]

Originally Posted by deprydation

Unfortunately the FIC only gives us some functionality over the ECU on this car.

This is the second time I've seen you say something like this...what is it that you mean by this? What functionality is it that you want? The FIC allows you to tune the car just fine, it always has. It won't however let you remove the factory governor or raise your rev limit...two things that would be bad for MPG anyway!

I'm curious as to what "functionality" you are looking for?

[DustinH]

I searched and found that cheap gas gives bad mpg.
So id say if i was to tune just to get the most out of what i do have under the hood. Maybe even be able to tune for something more one day.
Im using higher octane now so its actually running better..The mpgs went up a bit as well.

[deprydation]

Originally Posted by BrianJ

This is the second time I've seen you say something like this...what is it that you mean by this? What functionality is it that you want? The FIC allows you to tune the car just fine, it always has. It won't however let you remove the factory governor or raise your rev limit...two things that would be bad for MPG anyway!

I'm curious as to what "functionality" you are looking for?

I'm looking for a system that I don't have to spend like 700 bucks on to flash new maps to my ECU via dyno tuning. Similar to something like Ecutek tuning or whatever you guys are using to tune the Evo's.

Unlocked ECU please?

[BrianJ]

^^^ I see.

Well, the 4G isn't no EVO! Anything that does come out is most likely going to be pricey no matter where it comes from...

[hackish]

Originally Posted by deprydation

I think part of the problem with us is that we have so small of a tuner community for this that nobody besides Hack has really tried to break into this thing and decode the guts and change crap around. With the Evo community you probably had about 20 companies instantly wanting to crack that ECU and pull all the power out of they could. If those companies only realized what our generation of Eclipse is really capable of even being FWD they'd probably change the tune a bit.

The difficulty is the investment in both time and resources to build a flash. If a company is prepared to do a complete disassembly and patches they're easily looking at 6mo-1 year and $250k+ in labour. How do you make that money back? You'd need to do like 50 ECU flashes sold direct to the customer just to break even on your investment.

On the fuel economy issue is the check engine light on? If so then what is the code? When I was in FL I did some ECU work and the owner commented that just fixing the O2 sensor stuff made a significant difference on his fuel economy travelling up to see me the second time.

I haven't had the time yet to play with a GT and its economy but there are additional things like adjusting the EGR parameters to give you an easy 1-2mpg in additional savings. Adjusting the closed loop/open loop targets and target delays also help. There is lots of wiggle room in the stock tune.

-Michael

[DustinH]

I think i found my problem !!!

MAF Problem

[NitroGlisson]

Originally Posted by deadninja

Wait. Isn't Ethanol supposed to have high octane levels? More octane = more power = better fuel economy?

Nope....less energy stored in the fuel...the only thing ethanol is good for is making cereal cost more

[NitroGlisson]

Originally Posted by Chaos

Only wusses measure it in MPG. I measure in GPM! Bwhahaha

When I had the '71 Boss Mustang I use to measure mine by TPPG......that is telephone poles per gallon

[ferazjaved]

dude, change your gas station.. i was getting 13 per gallon on my GT, once i changed it i started getting upto 17.. and yeah it depends on how you drive.. just try to drive it in a constantt rhythm lol hard to explain but you know dont press on it too hard

[DustinH]

Lol i dont have it WOT everywhere i go.

[foxrider20]

Originally Posted by DustinH

Lol i dont have it WOT everywhere i go.

Well why not haha... Try different station for sure some places fuel doesnt run with a shit in a performance application...

[DustinH]

lol because if i did run everywhere with my foot in it gas would be gone really quick. Im gonna buy another MAF sensor since mines all rusted. I've tried all kinds of stations...octanes ...pretty much everything.

[sk13322]

my car was getting bad mpg so i reset my ecu and it seemed better, im goning to check my maf when its not -9 out.