hey,

i was wondering how much more gas a turbo would burn on a 2000 civic si, than the car usually burns. does anybody know? thanks.

Lance

the turbo itself doesnt burn any fuel...its the upgraded fuel system to support the turbo that burns more fuel. the ammount of fuel youll burn would depend on the size of the turbo and the ammount of boost you would be pushing...therfore the more fuel you would have to supply for a proper mix.

You will notice a change in fuel mileage, but it's not gonna be a huge jump especially if you are just going to be pushing like 8psi. Just make sure you tune it. If you just throw a kit on you'll be running rich. Tune it and lean it out and it will save gas.

if you are using the turbo for making your car faster then you shouldn't care about mileage that much, you can probably afford a couple extra dollars a week.

you can also use a turbo for saving gas as you can tune it to run the same amount of fuel but with more air, thus giving you more power per unit of fuel and getting you further per tank.

i wouldn't advise doing what Reed just said. That's a good way to blow an engine. When tuning under boost always try to keep an 12:5 AF ratio or lower for added safety

if you are using the turbo for making your car faster then you shouldn't care about mileage that much, you can probably afford a couple extra dollars a week.

you can also use a turbo for saving gas as you can tune it to run the same amount of fuel but with more air, thus giving you more power per unit of fuel and getting you further per tank.

This is called running lean (too much air, not enough fuel) and it can cause your pistons to melt. Running lean causes heat that no cooling system will advert.

Like most people have said, the turbo itself does not use more fuel. You add a turbo and you're adding airflow, which means you have to add more fuel. As long as you aren't mashing the throttle everywhere you go you shouldn't see much of a difference.

you can also use a turbo for saving gas as you can tune it to run the same amount of fuel but with more air, thus giving you more power per unit of fuel and getting you further per tank.

Reed, who gave this this idea. N/A motors naturally run leaner than FI motors.

I've seen a/f ratios on N/A motors as high as 14:1, if you tried to do that with an FI motor, you've have a molten mass of pistons. Whenever you add air, you have to add fuel.

If you're running a turbo with a good EMS system, your gas mileage should not waver much/at all if you keep your foot out of it. If you get on it, be prepared to suck back a ton of fuel.

Running lean causes heat that no cooling system will advert.

Not true, if you were to replace your stock cooling system with one which drops the entire engine compartment into a bath of 1.9K superfluid helium, you could run as high of compression as your engine could stand, and if you wanted to go higher, just increase the pressure of the bath to equilize it. Of course, this means your car couldn't, you know move.

I'm not saying the guy should run like 10 psi, after all it is a honda engine probably without engine mods. he could safely run 4 or 5 psi and lean it out a little, hell if he knocks back the timing and intercools he could probably run more.

I dunno, I get about 90 miles out of a full tank in my GSR and im only running 440 cc injectors and a fuel pump

Reed, you make no sense!!! COMMON SENSE ALERT:
Fuel contains the energy used to create horsepower. If you add less fuel, you will create less power.

Not so common sense, but should be to anyone who knows anything about cars - leaning an engine out is about THE WORST thing you can do for your engine... In fact, short of chucking bolts into your intake while the engine is running(or anytime for that matter), I really cant think of anything worse. A precise A/F ratio is THE KEY TO POWER AND PROLONGING ENGINE LIFE!!! You will make the most power with the perfect A/F ratio. Running lean will produce a bunch of excess heat, which not only endangers your pistons, valves, cylinder walls, head, turbo, and pistons, but it makes everything inside your engine considerably hotter which will heat the intake charge on the intake stroke and therefore give you a less dense mixture and less power! Hooray! Running rich causes fuel to deatomize and turn back to liquid, so there is less combustable fuel in the chamber, as well as making it harder for the spark plugs to fire. However, running rich aint all that bad - it wont cause any damage; your engine might not run as smooth and you'll waste gas, but at least you're not in danger of going lean.

Reed, you make no sense!!! COMMON SENSE ALERT:
Fuel contains the energy used to create horsepower. If you add less fuel, you will create less power.

Not True.
naturally aspirated engines normally dont run at stoichiometric mixture if you put more air into the cylinder without increasing the amount of fuel you will run at 14.7 or maybe higher and since that will increase the heat in the cylinder ( and burn all of the fuel and air at 14.7:1 ) you will get more power out the the same amount of fuel, thus reducing the amount of fuel it takes to make a specified amount of energy. sure you may run hotter, but not that much ( im not saying that anyone should try to run 10-20 psi on stock internals or stock fuel ). also, a little added heat is nothing that a slightly upgraded cooling system couldnt dissipate. and like i said, intercooling and retarded timing will take care of knock, detonation, or preignition.

by the way XixGenuinexiX , what the hell is a 12:5 A/F ratio

Not true, if you were to replace your stock cooling system with one which drops the entire engine compartment into a bath of 1.9K superfluid helium, you could run as high of compression as your engine could stand, and if you wanted to go higher, just increase the pressure of the bath to equilize it. Of course, this means your car couldn't, you know move.

:rofl:

That's a good one, I'll have to remember that.

I'm sorry, but I can't condone running lean at all. Lean is bad. Don't do it. Even if you run 'just a little bit lean', if your wastegate gets stuck for a second and your boost spikes over what your fuel is capable of, or if your fuel pressure drops for a moment, you'll go very lean and burn your engine. With a properly tuned and built engine, you will waste very little gas at stoic and definately will not be worth running a bit lean. You might get an extra mile on a tank of gas.

Forget a turbo man; get a 10k stand alone fuel managment system and a couple bottles of NAWS.

Lean = bad

tune the (already) poor engine prior to turboing it.

rich = bad

reed as everyone told you running lean is among the worse things you can do for your engine. and it will not add a litle heat, it will add tremendous amounts of heat.


The combustion chamber temps will skyrocket so high under lean conditions that your pistons will literally melt and fuse with your block, unless you detonate first. These temps are far beyond any cooling systems.

If anything if you're not 100% sure of your A/F ratio always err on the side of rich.

Of course the trick to power as mentioned by duplox is tune tune tune so you can run the best A/F ratio possible.

exactly. Cough up the money to go to a dyno for a few hours and have them dyno tune it for the absolute best performance. Added bonus is you get to see how much power you're actually gettin to the wheels.