Hi,
I was wondering how much will my MPG improve if i ask my tuner to tune a "gas saving map" for street use? will this "map" do better than stock map or is this even doable?

 

Well, it is possible via timing/MIVEC/WGDC changes, but do not expect miracles, 5-10% saving is possible.

 

You'd probably be better off to drive slower and shift earlier.

 

There's a cruise mod by Hiboost that I've used for over a year now. Just search for the thread. I probably saved 2-3 mpg on highway cruising.

 

im driving slow and shift so early already...but because my tune the MPG went soo low...
just wondering what is the MPG r u guy able to get? i only have 16-17 MPG with freeway....

 

there is such a thing as a gas saving map or transit map in rally, but you need a proper ecu for that , so you can switch between maps. Actually there is 3 different map rally guys using. Race - test - transit/gas savings

Probably you will able to do that with Cobb., not as simple as the rally cars but still.

 

You can switch maps with the stock OEM ECU while the car is running, so owners already have a "proper" Ecu.

 

Then something is terribly wrong. Are you running in open loop all the time?

 

16 to 18 is all I get also...

 

I get that around town but definitly better on the highway. And my data is from hand figuring it not by the dash display.

 

Why nobody tunes two maps for the evo then, like one for race and one for DD?
I think that would be something people would pay extra money. For many reasons, besides the gas savings.
I am around Evo tuners and so, at least in the states 8 years now, and i never heard of this on OEM ECU. But at least i know now, this is possible too
It is an awesome thing to have two maps, does anyone have that type a tune currently?
How do you switch maps, with a button like the other ECU's do, the cruise control switch or similar?

thanks for the info .

 

^^ Evo X has that...
"EVO X Dyno Tuning for Dual Maps.

Your stock GSR ECU can be programmed to store two maps that you can switch between at will. This feature can also be used as a fail safe for water/methanol injection systems. The maps are switched using the cruise control switch. The cruise control still continues to work normally." copied from road race Engineering...
I already e-mailed my tuner(from road race engineering), now just waiting for his reply and see how much better could it work...because now the gas price is really killing me...im about 3-4 days per tank...

 

I easily get around 18-19 in the city and 24-25 on the freeway. The key is not only to shift early, but let the car decelerate on its own without mashing the brake pedal a lot. Just get a normal tune and you'll see a bump in the fuel economy since stock X runs super rich.

 

just need the tuner to lean afr's out a bit while not in boost and when the car enters boost it would richen up. i had a map on my miata that made 250whp and still netted me 30+mpg my best rating was 36mpg, but it was rwd and only 2300lbs so its not an apples:apples comparison, but still it can be done, maybe not 30mpg, but upper 20's sure.

 

I have 29 mpg evo X maps ;-p