YearsOfDecay

Only on the highway..

I've tweaked the HELL out of my O2 sensor on my haltech... I get about 22 on the highway..... If I NEVER let it hit boost........

I still have some tuning to do right around 0 PSI where its running fat.... but, its pretty good at 10 and 15 PSI ...... But, still, even if you get it perfect, boosting will KILL your MPG...

I can run a half a tank out on the highway and think I'm gonna break 20 MPG for sure and then some idiot wants to rev on me..... and I end up getting about 15....

Long trips though... i mean like over 50 Miles each way, like when I go back to my home town.. I get about 23-24... again... if i can keep my foot out of it and I draft a few trucks

iSP33D-for-J3SUS

Someone said that the "A/C wastes gas" myth isn't true, can anyone confirm? It sure seems to drain my tank...

iSP33D-for-J3SUS

PUSEHR

its parasitic drag so yea, it robs some of the engines potential and decreases mpg.

Syonyk

See Scathcart's post.

The SAFC-II will help, no question, but it still can't tweak the timing & such as well as a full standalone. You need to be able to tweak the timing for optimum economy as well.

However, I have discovered that the SAFC makes a big difference when I'm driving hard. I've pulled out quite a bit up high (still slightly rich of stoich, but not as bad as it is stock), and I no longer can chew through a quarter tank in 10 minutes on a winding road.

The stock ECU has pretty much one solution to any problem: Add fuel. Engine cold? Add fuel. Engine too hot? Add fuel. Engine at WOT? Add a LOT of fuel. Engine boosting? Add even more fuel. etc. A well tuned standalone can do a lot better.

Wastes gas compared to what? Windows closed & A/C off? Yes, it will draw more. Windows open? Around town, it will probably use more gas. Highway vs the windows open? I'll take A/C any time. Especially with the stock blizzard blaster system, once the car is cooled down I barely have to leave the A/C on much at all. The compressor cycles on and off to maintain temperature, and when it's off, it's not pulling any power. Yes, it draws a bit more than having it totally off, but I'll take comfort, thank you. And my ferrets agree. :-)

-=Russ=-

GodSquadMandrake

SAFC sounds pretty good. How much of a MPG gain does it provide? What are the other benefits?

Mushy B

I was watching myth buster one day.... and they took two brand new suv's and drove them around the track for a day until they ran out of gas ( one with the a/c on and one with the a/c off) they found that with the a/c on they lost a pretty noticeable amount on their gas mileage rather than the SUV which went something like 15 or 20 laps more with the windows down

Syonyk

They were also running the A/C on full MAX, instead of a normal "keep the car cool" setting. At least for me, if I leave the AC on max while going down the highway, I'll be making ice cubes in the car before long.

-=Russ=-

ViperDude152

my car got about 10mpg before. when i put the SAFC on. (It Was NOT tuned at all) I Only leaned it out a tiny bit from 1000-5000 for light throttle, and I was able to get around 16mpg. Thats with a pretty bad fuel leak near the tank too. Im sure i could have gotten way more if i didnt have the leak and if I tuned it right. That was on the highway, still pretty bad.

iSP33D-for-J3SUS

They only did that for experimental purposes. They proved the point that A/C wastes gas. Even if it isn't noticeable... studies like that prove that it does affect gas mileage.

iSP33D-for-J3SUS

ViperDude152

Dont forget about the draw from the blower motor too. That puts strain on the ALT which adds more strain to the crank.

Icemark

sell the Sports car and get an economy car like a Civic or a RSX/Integra.

I mean common. Its a sports car...

And lets face it... if 17 MPG is a concern because of gas cost, and not the cost of fixing a 15-20 year old car- well you are doing pretty good then.

DREYKO

ok you guys have convinced me that ill just give up on better mileage

jono20

dont give up. you just have to accept that you bought a high end sports car, designed to go fast and do it well, not for driving to chruch or the grocery store.

acceptable gas milage is not out of a reach, its just low on the priority list of people who buy these cars. 35mpg is not possible, but a proper tuning, a free breathing engine, and perhaps and SAFC or standalone will get you a little closer.

*wishes he was a mod* thread closed.

jhammons01

*re-opens thread*

Winner!!! LOL Cracks me up

*thread closed*

Syonyk

NO $|-|17!

A/C affects milage? That's not anything that needs a study. Now, how it compares to windows open is worth studying.

Anyway, if you're getting somewhere in the 15-20mpg range city, and 18-24mpg range highway, the car is working fine. Getting beyond that is too expensive to just do for the sake of fuel economy. If you're going with a standalone & such for OTHER reasons, fuel economy can be a nice benefit, but it's a lot of $$$$ to save a few $ in gas.

On the other hand, if your car is getting significantly below those figures (say, 8 city, 12 highway), there's probably something that needs fixing. Or you just need to seriously slow down.

-=Russ=-

Sideways7

iTrader: (7)

Yep, I got an mx-3 and it shot up to 30 or so.
For the record, I could get 30+ MPG going 70+ on the highway. Normal around-town driving I got 20 or so.

scathcart

Sorry, but this just cracks me up.

You really think your car is a high-end sports car?

$500 gets a high end sports car. Wow.

SonicRaT

iTrader: (6)

Amen.

DerangedHermit

What's the gas mileage of a Ferrari? Who cares, it's a freakin Ferrari. Obviously, an FC N/A is nothing near a Ferrari, but the same general concept, a sports car. They're meant to have fun in and disregard costs (to a point).

With how high gas prices are now?

jono20

look at the price when they were first produced. noob. with inflation, wow

DerangedHermit

I still wouldn't place it in the high end sports car category. I'd put it in the middle class section.

rmriggin

MR2s are a fun sports car that get great gas mileage. Also the AE86s get good milegae and are also fun to drive and still very mod-able. It is possible to have a fuel efficient sports car... Just not one powered by a rotary. Just my thoughs/opinion though.

SonicRaT

iTrader: (6)

~30k with inflation... and that's a high end sports car?

DerangedHermit

Look, nobody gets rotary engine cars for their power or gas mileage (compared to alternatives). For the same money you can get a more powerful car or a car with alot better gas mileage. People buy rotaries because they're cool.

Basically comparable to a Mazdaspeed Miata (what I consider as the replacement for the N/A RX7-Miata that is). I don't think anyone considers a Mazdaspeed Miata as a "high end sports car".

SonicRaT

iTrader: (6)

The Enzo gets 8/12
360 gets 11/16

Not too far off from what most of you FC guys get!