Just wondering as i am sure it has been done, but with gas prices now a days driving my 2dr 1990 DX hatch 4speed, getting 40MPGs got me thinking.

With the capability of most Engine Management Systems like Hondata, for example you can tune pretty well for Partial throttle tuning. I was wondering what kind of gas mileage can one get with Max Partial Throttle tuning? Cause in theory i am thinking Hybrid car numbers cause at being 40MPGs already, on my hatch with tuning it could only get better.

Or for that matter say buying a 4dr Civic DX lets say, 96 and tuning that D series motor 1.6 liter? How much could i be getting MPG wise??


Anyone care to share their personal experiences?

 

I just got 31.5 mpg on my Stock Turbo LS/VTEC running eCtune with a whole lot of tweaking/tuning.

I also just switched to 87 Octane to see if I can get the same MPG with the lower cost fuel as well, I'm on my first tank of 87 but it appears I'm getting slightly worse MPG, but I did tweak the timing and richen up the fuel a little in areas to be safe, as I am boosting 10-13 psi (depending on the gear) as I dont want to blow anything up.

I am running a Snow Performance Stage 2 water/meth kit as well for safety

 

Raise your closed/open loop latch to a higher tps/load point.


Will help alot.

 

i'm getting a right around 30mpg in the city and 40mpg on the highway with my h23vtec. Tuning with Crome Pro as well.

I know i got 430 miles on 12 gallons with my last tank with a mix of city and highway including a few passes at the drag strip.

 

I did. I bought a VX, swapped out the tired Z1 for a 3 Stage VTEC. Installed an AEM EMS, an AEM Wideband, and an AEM Twin Fire with CBR coilpacks. I'm getting 39 mpg around town w/out using any special driving techniques. The best freeway mpg I've ever achieved is 47. There's more mpg to be gained still.

http://www.gassavers.org/showthread.php?t=7011

The heavy load portion is tuned for power. On my relatively stock motor I'm getting 119hp, 99 ft/lbs to the wheels.

When I get some money I'm going to fine tune all the part throttle cells on a load bearing dyno. I'm also hoping to get my homeboy who is an accomplished tuner to help me out with that. He lives 600 miles away.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 98vtec &raquo;</TD></TR><TR><TD CLASS="quote">i'm getting a right around 30mpg in the city and 40mpg on the highway with my h23vtec. Tuning with Crome Pro as well.

I know i got 430 miles on 12 gallons with my last tank with a mix of city and highway including a few passes at the drag strip.</TD></TR></TABLE>

Thats bangin' Mileage for a H Deuce Tre!
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by suspendedHatch &raquo;</TD></TR><TR><TD CLASS="quote">I did. I bought a VX, swapped out the tired Z1 for a 3 Stage VTEC. Installed an AEM EMS, an AEM Wideband, and an AEM Twin Fire with CBR coilpacks. I'm getting 39 mpg around town w/out using any special driving techniques. The best freeway mpg I've ever achieved is 47. There's more mpg to be gained still.

http://www.gassavers.org/showthread.php?t=7011

The heavy load portion is tuned for power. On my relatively stock motor I'm getting 119hp, 99 ft/lbs to the wheels.

When I get some money I'm going to fine tune all the part throttle cells on a load bearing dyno. I'm also hoping to get my homeboy who is an accomplished tuner to help me out with that. He lives 600 miles away.</TD></TR></TABLE>

HELL YES! Thats what i am talking about!

So you basically only tuned for WOT and not really too much partial? And still got that MPG?


Modified by BolivianFuego at 11:34 AM 6/17/2008

 

By just reducing the fuel at cruise and advancing the timing slightly, I get about 42MPG consistently highway driving on my 12.5:1 B17 (B16 S1 tranny too) in my CRX. I got slightly more in a high compression D16A6 last year on the way to and from N13, and also on my move down here in September last year. Around town in the B17 I get about 30MPG, when I can keep my foot out of it.

I just remove fuel in the cruise portion while I'm on the highway until it misfires, then bring it back a little. Advance the timing a hair and pull more fuel, wash rinse repeat.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by downest &raquo;</TD></TR><TR><TD CLASS="quote">By just reducing the fuel at cruise and advancing the timing slightly, I get about 42MPG consistently highway driving on my 12.5:1 B17 (B16 S1 tranny too) in my CRX. I got slightly more in a high compression D16A6 last year on the way to and from N13, and also on my move down here in September last year. Around town in the B17 I get about 30MPG, when I can keep my foot out of it.

I just remove fuel in the cruise portion while I'm on the highway until it misfires, then bring it back a little. Advance the timing a hair and pull more fuel, wash rinse repeat.</TD></TR></TABLE>
Interesting...

 

Sweet I love good milage .I just boosted my hatch 3 weeks ago and I think I get 25 or 27 mpg and I'm running a afc hack and I plan on getting it chiped by crome ill have 2 base maps one for power and one for mpg .if there's any thing I can do to get kick *** milage let me know or just keep posting up here

 

D15Z1 in a gutted 88 CRX Hf, has the stock HF trans behind it, getting ~70MPG +

 

That is sick dude! Is it tuned getting that MPGs?

 

I just tuned my lsvtec turbo and a friend's sleeved h22 prelude. Both passed emissions. The Prelude passed with flying colors, my car barely passed but I spent more time on his car since I was tuning specifically for emissions.

I don't know what kind of MPG he gets but I get about 28MPG driving nicely.

 

Thats not bad!

But what i am looking for is the best gas mileage for a setup that was built towards that! I doubt you turbo'd your car to get better gas mileage!

 

build the motor to require less fuel but have enough torque to not have to use the pedal (overly) to accelerate.

 

1993 Del Sol Si 220,000 miles
I but in an S300 and we tuned it for milage.
Old average 31.5mpg new average 35.5mpg. The 35.5mpg is 87 octane with AC on.
Not great but on the 1300mile trip I just took saved a ton.

 

I tuned a turbo SOHC and the owner called me to tell me he gets 750-800kms per tank which is about 500 miles. He's running 10psi and has 380,000kms (240,000 miles) on the engine and it passed emissions better than he ever has.

Turbos increase the efficiency of the engine, I now get about 30-50 miles more to a tank of gas since i've boosted my car, thats with some spirited driving too.

 

Interesting... i have never heard of adding a turbo and GAINING MPG, i've heard of losing/ keeping the same MPGs. But how?? In essence doesnt the car have to run more rich to keep it frmo blowing up = more fuel?

 

A co-worker of mine added a Jackson SC to is 1st Gen CRV gained 5mpg. It was an automatic and didn't have down shift as much. It ran in the better gearing longer.

 

47mpg in a stock 95 ex, with ac, freeway driving. More vacuum = less fuel (try to stay in gear while slowing down), stay off the brakes!!, try to stay in a higher gear (anything under 65 = 4th gear on the ex ie. between peak tq and peak hp but stay off the throttle as much as possible=more vacuum), and accelerate downhill coast up hill.

 

Ya just boosted my ef hatch and I'm getting a lil better milage just on a afc hack but when I get it tuned I should b getting 35 or 40 .I'm still tryn to find better ways to use a turbo for good milage

 

I to dont understand how getting a turbo gives you better gas mileage. Just because a turbo makes your motor more effiecent doesnt mean your going to get better gas mileage. If anything its going to get worse because you know your going to be boosting.

 

Because you get to play with your fuel more now then ever(afc hack) so with a n/a car u can't realy tune your fuel much .but if your in boost hell ya I lose 3 or 4 mpg at most and that's nothing so if I stay out of boost my gas last a long time .its all in the tune more boost more gas no boost more gas milage simple and fun

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by BolivianFuego &raquo;</TD></TR><TR><TD CLASS="quote">
HELL YES! Thats what i am talking about!

So you basically only tuned for WOT and not really too much partial? And still got that MPG?
</TD></TR></TABLE>

Yeah I built the car for all around daily driving, so there was a heavy priority put on fuel economy. But there's no way I'm going to neglect power. So the 3 Stage VTEC was a perfect opportunity. But there are a lot of things I've added that aren't helping FE, ie the LSD tranny, 15 inch wheels, etc.

All the heavy throttle portion (everything above 65kPa) was dyno tuned for power. There's really nothing to be gained by attempting to tune heavy load cells for mpg. The rest I tuned on the street. Idle is 14.7:1. 25mph to 35 mpg cruising cells were tuned for smog. Cruising from 45mph to 80 was tuned to run extremely lean (basically everything from 35kPa to 55kPa and above 2500 RPM). This engine allows me to run 18:1 fuel mixtures and light load in 12 valve mode. There's no hesitation or stutter like there is with the VX lean burn motor. I spent a lot of time on the transient throttle fueling.

Lowering the car and starting with a VX shell helped (front lip spoiler, rear diffuser, lightweight engine mount, etc).

 

A turbo gives you better volumetric efficiency but not necessarily fuel efficiency. The strategy is to use a low displacement engine and make up for the lack of power with a turbo.

If you put a low boost turbo on your engine and don't drive it hard, you get better mileage. 99% of the time you're not in boost, but then the boost is there to get you up to cruising speed faster or pull you up a hill faster so you use less gas.

 

No I dont believe that is correct. First of all turbos do not increase volumetric efficiency of a motor. Second a turbo in your exhaust stream can only hurt your gas mileage. You can tune a na car just as easily if you get some sort of management and I guarentee it will be better on gas than its turbo equivlent.