95hatchcivic

hey
my civic is turboed if that makes a difference

k when i have my foot on the floor what should my air fuel ratio be reading?? what is the correct reading for it when throttle is at full?/ should it run ritch? or should it run somewhat stoich like on idle?? i dont know, im trying to tune my greddy emanage thing and im not sure what im suppose to be seeing when im mashing the pedal

6Msentra

if you continue like that you will be seeing a fire under your hood when you make an engine window.

are you using a piece of narrowband a/f guage to tune your turbo car?

get some professional help, or at least a buddy that might have a little clue. because right now you sound like a disaster.

DSMonster

WOT - 11:1 on pump , 12-12.5:1 on race fuel
Idle - 14.7:1

Some people like to go even leaning than that. I wouldn't go too much leaner then 11:1 on pump gas tho. Myself, I like to stay on the rich side of things just to be save. Hope that helps.

edit: always use the highest octane available.

crazyae

iTrader: (2)

check out pgmfi.org

its an awsome site to find information about tuning.
Everyone has to learn somewhere, but be advised you can destory your engine if your not cautious and understand whats actually going on and why you do certain things. Its not a guessing game

Flashpoint-Matt

Tuning is an EXACT science, if you are unfamiliar with it, your car can become a university. And what I mean by that is that it will teach you, but to successfully learn your lesson you better take out a loan because your going to pop your motor and quite possibly some other bolt-on parts.

#1 rule of tuning is maintaining a proper air/fuel ratio. Running too rich you will lose power and pollute your oil with gas. This in effect will cause bearing failure because gasoline will break down the oil molecules in your bearings (both crank bearings & cam bearings). Running too lean will cause you to lose power and blow your motor due to detonation. Running lean causes your engine to superheat the combustion chamber and you will either burn a hole in your piston, drop a valve or crack a sleeve. Ideal air fuel for boosted applications is around 11.8 - 12.3:1 anything richer then that and generally you are costing yourself power. Also you might want to consider getting a boost controlled fuel pressure regulator to help keep your ratios steady.

#2 rule of tuning, a narrowband O2 sensor is not a reliable means of monitoring air/fuel ratios. Since the narrowband O2 is only capable of reading a small spectrum of ratios, it cannot adequetly report to your guage or the computer what the car is actually doing. If you want to tune using the WOT technique you will need either a wideband O2 or an EGT/Pyrometer. Both of which are reccomended with higher boost setups anyways.

Bottom line is that if you paid to do this setup, you should atleast have it tuned properly, without a proper tune your engine will conk out within a matter of months, maybe less. I reccomend you see a dyno to get a good tune, if you would like PM me and i can shoot you in the right direction.

DSMonster

You should really state what kind of fuel with that AFR. Because running 12.3:1 on a boosted car with pump gas is too lean . Pump gas really shouldn't go leaner than 11-11.5:1. I'd only lean it out to 12:1 or leaner with higher octane fuels. But hey, feel free to blow up your motor for the sake of a few extra horses.

"Also you might want to consider getting a boost controlled fuel pressure regulator to help keep your ratios steady".....This is not a consideration, its mandatory. You need a rising rate FPR. For every 1psi of boost your fuel pressure needs to also raise 1psi. If it doesn't your going to go real lean , real fast.

79camaro

idle should be about 48 psi but it depends on what your fuel setup is like but remove the vacuum line and itll tell you what WOT is and itll jump about 4-5 psi higher

DSMonster

That statement is not true. Taking off the vacuum line will not tell you anything about WOT. Taking off the vacuum line will tell you your base fuel pressure. I cannot comment on the 48psi base pressure for hondas. But consider this, if base pressure is 48psi and you run 20psi, then your fuel pressure should be 68psi once full boost is reached.