Depressing MPG
 

Well I drove very slowly this last tank of fuel. And I have an Aeroforce intercepter gauge. It reads a lot of stuff including current MPG while driving. I left it on the MPG this whole tank and when cruising made sure it stayed above 30mpg. Filled up my tank today and I got what you see by the Ion redline 27.XX mpg :(

Oh well it's still decent for 242HP to the wheels (270ish at the crank)
2.0L Supercharged 4 cylinder.

Atleast my civic is sitting @ over 30mpg safely.

Don't be discouraged by one tank, you have to average out several tanks to get an accurate measure of mpg. An individual fillup can be off by a substantial amount, lots of variables (slope,temperature,vent finikyness...)

korax123 -

skewbe's right, MPG is a long run proposition. A low start means you can only go up, right :o ?

I wish I'd known about the Aeroforce gauge earlier. It doesn't have the 4-way display, but it does have other inputs like 02 readings (which helps for going lean), and it looks righteous!

Have you joined or trolled around the www.saturnfans.com website? They have an Ion Red Line forum. I doubt it's devoted to MPG :D , but every detail helps.

CarloSW2

You have to start some ware. I don't know if you noticed, but many of the gaslogs show an upward trend. As people learn more about their cars, learn better driving techniques and do modifications they tend to get better MPG.

I am a member there but don't post ever I used to when I had a QC3. But I am a very active member on www.redlineforums.com

Blocking off my front vents would problably help a lot but I need airflow in the engine bay with the supercharger there so it's really not an option. And I can't really do any coasting because where I live there are no hills. I did find a different side street to take to work though that will eliminate 2 stop signs on the way to work.

I am going to drive normal this tank and see what I get. And if i get crazy enough I can put a larger pulley on my S/C and tune the car for better FE.

One question though I constantly get a running rich code and my O2 works cause the # bounce up and down on my gauge. It runs rich when cruising what other sensors can I look at?

And would gapping the sparplug smaller help???

What performance mods have you done to the car?

edit: I just looked at the garage and saw the mods. Are the bigger injectors tuned good? Do you have an adjustable fuel pressure regulator? If fuel psi is too high it could make you too rich.
(I like sc cars too, mine is an 89 xr7 5spd)

Well the staotich or whatever AFR is set to 14.7 (when cruising) and my buddy with the same mods got dyno tuned to 11.8:1 AFR @ WOT. We flashed the tune on my car also. It pulls to 7200rpm with 0 knock. So the car runs good WOT just cruising it runs rich for some reason.

You don't need hills to coast. Every time you know in advance that you have to stop (ie. most of the time) is a coasting opportunity. The less you touch that brake pedal, the better.

how big is the collector for the header and cat? 2.5 to 3 in is a big deal...

what kinda figures does it give you at the track?

what kinda of driving do you usually do?

and those are aftercooled right?

I'll second this. where i live and drive are no hills at all! i usualy stay at or below the speed limit and let someone else sit there at the red light while i coast up and if timed right it'll change and i don't have to even touch the brake pedal.

Hi, "korax"!
27ish MPG (av.) is decent? When you aren't pulling big power from the engine (drove very slowly) ? For a 2.0 liter? Ah! The stories I could tell you! Send me a legal length SASE and I will send you my "Fact Sheet I" (6 pages of info) for my modified gasoline (I'll even pay the extra postage). Is fair?
I wouldn't be discouraged by one (easy ) tank...I'd be ill! Gas co$t$ too much !!
Ted Hart
PO Box 1165
Pittsboro, NC 27312

Yea there is a an intercooler on the S/C. I see 16.5psi of boost @ WOT. And my best track time so far is 14.7@100.73mph with a 2.5 60' because the stock tires were horrible. Since then I have gotton better tires and a better tune, but haven't been back to the track yet.

The header collector and downpipe is 2.5" and it goes into a 3" exhaust with a 3" in/out Edelbrock SDT muffler.

I usually drive slow and don't accel that fast at all. Ask my wife she makes fun of me because my car is pretty quick and i drive like a grandma.

hmm... i bet having a smoother transition to the massive exhaust will help a lot in both power and fuel economy.

when i ask the type of driving i mean do you do mostly stop and go? freeway cruising?

and as you mentioned before, not letting the aftercooler get air with a grill block would be the biggest mistake on that car.

27mpg on in the 225-250whp range is pretty good for a domestic. some of the turbo civics do that as well as most k swaped civics. one of my buddies with an rsx-s motor in his civic put down 230whp to the wheels and gets 32mpg on his way to and from the track, which is the only time he drives it on the street.

since most turbo integras and b series civics can get low 30s mpg i would say that you have some room to improve mechanically.

do you have a high flow cat yet?