looking to increase the gas milage on my ek. stock d16. dual point plugs, gay ebay aftermarket intake that came with the car. im replacing my bad 02 sensors today. im thinking htat running it a few notches leaner will yield favorable results. anyone have any ideas on how to do this? i thought just grabbing an apexi afc but its not looking like an easy or exact solution to my efforts

 

In addition to fixing any CEL codes, do a basic ignition system tune up - standard NGK plugs, wires, cap, and rotor. Set the ignition timing to spec as Civics are already designed to get optimal gas mileage.

 

Replacing your o2 sensors, doing a tune up, and changing your driving behavior are probably the most effective ways to increase your mileage.

I just did a tune up last week and my mileage went from being ~29mpg per tank to 34mpg this week.

Here you go:

http://cgi.ebay.com/ebaymotors/96-97...Q5fAccessories

Paid $87 shipped for mine a few weeks ago. I even got an A01 honda oil filter too!! Not the A02 thankfully.

 

+1 For tune up and def. driving behavior. Obviously more so if you drive a manual.

 

Another thing to consider... fuel filter and injectors.
Fuel filter is easy, injectors are a bit trickier. Depending on the miles you have on the engine, I would buy a spare set of OEM injectors (to avoid downtime - you can find them used for under $100) and have the seller ship them to Rich @ Cruzinperformance.com. Let Rich do his magic, you will love seeing the flow difference report before and after and you'll likely see a very noticeable difference in fuel consumption.

-Walter

 

right on. i dont drive this one hard at all, im more so about looking decent and being comfortable on my 140 mile daily commute. if i feel the need to waste petrol i pull out the crx. ive read a lot about more air causing a more complete fuel burn ie: forced induction creating better milage in certain cases. i started doing synth/blend oil changes. still need to shoot my timing though. do you think upgrading to an msd ignition setup will be worth it for my endeavors?

 

Lowering the vehicle will improve hwy mpg slightly. 4% ish So around 1-2 mpg.

 

Substantive evidence to support this claim?

And yes, forced induction can increase mileage. But it would take you a while to recoup the cost of a proper turbo with the intention of increasing mileage.

 

jughead is actually pretty on point with his statement. but its conditional. you have the car lowered to a 'proper' height, this case 'proper' is defined as the point where the axles are parallel and level to the road. it reduces the rotational effort of having all the parts constantly moving so much to accomodate the ride height. not sure if its 1-2 mpg difference, but i remember it being printed and expainled several years ago

 

Another benefit to lowering (albeit a slight one) is reducing the frontal area of the vehicle, since less of the tires are exposed. This reduces drag, though it may not be enough to be noticeable.

Reducing the volume of air flowing beneath the car (very tubulent) may be an additional benefit, though I don't have any data on that. Some folks have added air dams to reduce underbody airflow and have reported mpg gains, despite the increase in frontal area.

 

I agree with the tune-up advice, I wouldn't mess with A/F ratios though OP.

Also, inflate tires to max psi as indicated on the sidewall. Harder tires that have less give have less rolling resistance, which promotes better fuel economy.
I do not recommend anyone inflate their tires over the manufacture's specs.

Rolling down long grades or straights in neutral helps, also takes practice to know when and when not to do it. You'll learn quickly on roads you commute on frequently.

Avoid hard acceleration up grades, or avoid acceleration up grades altogether.
One that I practice is to use the cars momentum to get up the hill, lifting off the gas pedal a bit, and re-accelerate down the other side of the hill (if there is one).

Some of these hypermiling tricks will royally infuriate drivers behind you. I tend to drive normally when other drivers are behind me.

There are sooo many tricks like this, too many to list and some are very tough to explain.
Look up hypermiling or go to GasSavers.org for more info.

Any idea what the price is for the cleaning?

I want to do something like this, mine have nearly 200k miles on them, there is no way they are working optimally. So a few days ago, I contacted RC asking if the sold OE replacement injectors. They do, but recommended instead that I send the ones I have to them for cleaning and blueprinting (which, by the way, is much cheaper than buying new ones - that is honest business practice). I replied back (yesterday) asking if that would make them as good or better than new, but haven't received an answer yet.

 

Absolutely... my last set (ITR Injectors) came out to $17 per injector. That includes the entire process I linked above. Here are some before and after pics of my last business with Rich. He's a really good guy, he'll reply back to you very quickly and answer any questions you might have.

Good luck,

-Walter

 

hows the car run after the cleaning?

 

no data needed. look at drag cars and top speed flat trackers, nascar and indy. them things is flat on the bottom buddy. pruven technique in engineering

 

On the ITR motor I couldn't tell you the difference since I got the injectors done before putting the swap in the car. But I've done my 750cc injectors for the DSM several years ago as well as the stock D15 injectors on the motor before the swap and in both cases (especially on the stock Civic motor) I noticed a solid 6-10% mpg increase as well as the car starting much quicker, it felt like it took less cranks to start the engine.

-Walter

 

so im doing the injectors next, did the o2 sensors today and i can smell fumes out the wazoo but the cel is off so i guess thats good. so since on forced induction you gotta increase fuel delivery, whats the harm in decreasing it a little bit in stock situations. i'd like this thing to get a decent 40 mpg on a regular basis. my crx pre swap after a good tune up got a good 430 miles per tank.

 

If you advance your timing you will get the absolute most out of your fuel, with a slight (1-2hp) increase. Stock timing spec is 13-15 BTDC iirc, bumping it to the 16-17 degree range will get a lil more out of the fuel that is going into the cylinder without running into detonation problems.

 

I wouldnt do this. You can go up from whats on the door sticker. But the sidewall number is the max pressure the tire can hold. This reduce grip and make the car unsafe. You could go with narrower tires, but dont go any smaller than what the car originally came with.

 

hx or vx wheels and a vx flywheel and i hear bolt ons make the engine run rich without a tune,but thats just what ive heard not sure

 

Your ECU will actually compensate for any extra airflow. It's extremely minimal.

 

If you're going to go back up a hill, doing this to maximize your speed would be a good idea. However, if at all possible, it's better to keep the engine in gear. In neutral the engine must keep itself turning. The idle speed is fairly low, but it's still fuel being burnt. When kept in gear though, no fuel is burnt. The ECU just cuts the fuel.
Do not turn the engine off while driving. Your brakes will only work a couple times, power steering will go out, if you turn the key all the way your steering wheel will lock up and you never know when you may suddenly have to accelerate.

 

also I've heard something like $20 for cleaning. Ideally you'd get matched fuel injectors, all flowing within .5-1% of eachother. Injector Dynamics offers this service. Send in a number of injectors and they'll flow match them.

 

You got to duct tape the gaps in the hood and duct tape/cardboard the front of the car to make more aero The drag cars back in the day did it lmao :D Just adding that because everyone was saying something about aero lol. There are plenty of bodykits out there that air wind-tunnel tested, Im sure there one that extremely reduces drag. Maybe take a look at the salt-flat civics

this guy is rockin the metal front :D
http://www.turbomagazine.com/events/.../photo_01.html

 

why not just take the head off and put a 2 valve head on it and a vx throttle body?

you can also rig up a warming pipe to run from around the header to collect warm air to push into the intake. warm air helps with fuel mileage more than cold air will.

 

If any of you are interested, RC never got back to me, so I contacted Rich. Here is my email to him and his reply:

Sounds like an honest, solid guy to me.

And $17 per injector is a steal IMO. Fuel prices just went up .20¢ here OVER NIGHT. Something like this should be considered if you are concerned about fuel economy.