I already know about all the hypermiling tricks, airing up tires, weight reduction, etc... I've searched and from what I've read everybody says granny shift, drive under 55 or air up tires to 50 psi.

Well I'd like to take it to the next level. I've been doing some thinking, what can I do under the engine bay to improve MPG? Already did a basic tune-up.

- Advance timing to 18deg
- Grounding kit (??)
- Cold Air (?)
- Seafoam treatment
- Synthetic oil
- ECU tune (?)

Any other ideas?

 

I must ask.

What is your motive for better MPG?

Impress internet people?

Save money?

Protect the environment?

The reason why I ask is:

• Impress internet people: No one cares
• Save money: Money spent on mods will likely negate the few dollars you save at the pump even in the long run
• Protect the environment: Somewhat a plus here but mostly negated by cost and sourcing of parts

It's a Honda it's already efficient and the tune from the factory is really fairly good for MPG.

My $0.02.

 

dont drive! you'll get all the mileage you want haha! j/p, you're already getting 35+mpg(city) and 40+mpg(highway) with that thing. why need more?

 

Need Moar!

 

Cold air intake, header, exhaust can help but pricey. my 92 civ came with cai and catback exhaust. i found a header through a friend of a friend of a friend...lol for 100 bucks and its helped a bit more. i also noticed less friction in the motor and tranny when i put in redline synthetic oil in the motor and redline synthetic manual transmission liquid in the tranny..running higher octane fuel i noticed a difference with lucas oil injector cleaner with cylinder head lubriacant and fuel system cleaner, and octane booster..getting your cam shaved and redone by a tech can help gettign that done next. im looking for a ecu or upgrade software for chip..also thinking about putting a 7lbs aluminum flywheel in when i do my clutch.. as opposed to 20lbs rotating mass can help also lighter rims, also ratating mass. ive looked into snow performance water/meth injection kit but somewhat pricey as around 300. im trying to find out if the d16z6 intake manifold would increase mileage, throttle body spacer and a bigger throttle body but so far no feedback on those 3

 

also i shift in every gear at 2000 rpm... by the time i'm at 2000rpm in fifth im going 50mph/80kph

 

 

also read about wiring in a vacuum gauge to your intake manifold...try to keep it as high as possible the more gas you give it the lower it goes

 

Put a D15B8 8 valve head on it....i got the head Intake Manifold,Intake Tube/Box,Ecu(5 speed),dizzy All for $235.00 shipped you will get 7-10 more MPG

 

d15b8 head reduces power tho, b7 already doesnt have much

 

This thread was dead.

 

More weight reduction: lose your strut bar and anything else that isn't welded to the interior of the car. (seats, floor mats, etc)
Other ideas: take off your license plate and wedge it into the top of the dashboard to further streamline the front of your car.
May wanna lose the foglights and just fill in the gap with cardboard pieces

What else...oh, if you have a spoiler, lose that too
Big sound system? Lose it
If you REALLY wanna be extreme, you could lose your airbags, but that's kinda crazy and probably won't save ya that much weight

Go to aluminum 14 or 13 inch wheels-much lighter than stock steelies

And as for under the hood stuff...believe it or not, install a catch can/air-water separator or two-one for your vavle cover vent and one for your PCV valve
It may sound nuts, but the less liquid blow-by mess you suck back into your intake and foul things with, the better, plus if all you're pulling is just the unburned fuel fumes back into the intake, you'll get a little better gas mileage instead of venting it to the atmosphere.

Lighter Aluminum radiator to replace the Del Sol one you have there ^^
And lose the washer fluid reservoir/pump/lines
You could also probably relocate your battery to the trunk to balance the weight a little more and reduce drag on the motor/trans

As for other things, get a more freely flowing exhaust system if you don't already (preferably as light a weight as possible)

Beyond that, it gets extreme (as in cutting out parts of the car and buying carbon fiber hoods/trunks/panels extreme)

 

the strut bar is aluminum...at tops weighs 5lbs? it helps with handeling so thats staying..as far as steelies i have on it now are for winter for when it snows.. i put my subs in also for the winter so theres more weight. during the summer i gutted out the rear had aluminum 14inch honda rims, no spoilers, licence plate has to be on the bumper get ticketed otherwise, carbon fiber is pricey but something ive always looked into its not the cheapest way. also carpet doesnt wegih all that much. auminum rad wouldnt do all that much of a difference they are fairly light to begin with also pricey, but i guess every little thing adds up, i do want a new rad tho

 

Please explain this in detail.

Not possible.

EDIT: Unsubscribed. Waste of time.

 

Ive also been looking forward to doing somethig like this. Thanks.

 

first off the motor oil and tranny oil was old and dirty and probably conventional i put redline in both motor and tranny..it ran alot smoother..higher octane fuel it runs crisper

 

Sell it and buy a Hybrid, or a Geo Metro.

 

Okay, the oil thing is up for debate. Sometimes after running old oil for a while a new oil change can seem to smoothen things up a bit (even if in reality is doesn't).

The higher octane fuel literally does NOTHING for you. Don't waste your money. Higher octane is used in engines that require it, such as high compression builds or factory performance engines. If I'm not mistaken, almost all of Acuras new lineup requires premium fuel. Higher octane prevents detonation, but in your engine it will make zero difference.

Save your money.

 

people seem to say both opposite of higher octane fuel, the fuel is cleaner though..wouldnt it keep the motor cleaner

 

what the hell? who says its cleaner? octane rating is its ability to resist detonation, not that its cleaner or anything. dont listen to whoever is giving you this horrible info

 

Eh, sorta. I always got worse mileage with premium gas. Which actually makes sense when you think about it, Octane booster and additives aren't fuel.

 

it says on the pumps... 87 has ethenol in it thats to help it burn cleaner from impurities in it

 

They just started putting ethenol in the gas around here less than a year ago. It reduces fuel mileage, luckily only 1 supplier is mixing ethanol right now so I can still get gas without it. Also, if it's in 87 it's in 89 since 89 is just 87 and 91 mixed together.

 

Basically, just do the basic tune up. If you have high mileage consider using a thicker oil. Those fuel treatment kits are pretty much garbage in my book. All the do is bring up **** from the bottom of the tank and ensure a timely clog. Smaller tires will increase your mpg as well. Just my 2 cents. It all adds up.

 

In my neck of the woods all most all gas has a ten percent ethanol. I buy premium for my y7 just because mobil and shell have ethanol free ”recreational” gas.