10% Ethanol
Thread Starter
I drive a coupe
Joined: Feb 2004
Posts: 762
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From: Virginia Beach
Re: 10% Ethanol
I retarded the timing, and it still run's lean.
I am using a 12:1 vortech FMU and I had this same kit with the same parts on this same car a few months ago. The car is definately not anywhere near as fast as it was before I took the kit off, and nothing else has changed... I have tried swapping the ecu and it still run's at the same mixture.
The thing is, fuel pressure is good... The A/F is the same at 1psi and 8psi with no drop or increase...
I am using a 12:1 vortech FMU and I had this same kit with the same parts on this same car a few months ago. The car is definately not anywhere near as fast as it was before I took the kit off, and nothing else has changed... I have tried swapping the ecu and it still run's at the same mixture.
The thing is, fuel pressure is good... The A/F is the same at 1psi and 8psi with no drop or increase...
Racetracks
Joined: Nov 2002
Posts: 15,668
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From: How long is a piece of string?
Re: 10% Ethanol
Originally Posted by sohc_mshue
It doesn't matter what the octane is. With ethanol you need to run more fuel period. The stoich ratio for ethanol is much lower than normal petrol and more gas will need to be used. Although one thing I have noticed is that this new 10% blend does not throw lambda values off to any noticable degree. I've tested it on 2 cars recently and there wasn't much notable difference between that and normal gas. Normal gas has had some ethanol in it for a while anyways. That being said though...if you were to run straight ethanol in your car then you would need larger injectors and you would need to remap the entire fuel map to run more fuel.
Thread Starter
I drive a coupe
Joined: Feb 2004
Posts: 762
Likes: 0
From: Virginia Beach
Re: 10% Ethanol
Maybe it is not the ethanol, but I still need to figure out what is causing this lean mixture so I can fix it... I don't understand why it is messing up now when before it was running great with the same setup about a month or two ago...
Thread Starter
I drive a coupe
Joined: Feb 2004
Posts: 762
Likes: 0
From: Virginia Beach
Re: 10% Ethanol
Well, my o2 is only a few months old and I can tell a difference between the way it runs now and the way it used to run...
I know that the blinky a/f gauges arent very trust worthy, but before I took the kit off that thing would read green as soon as I hit any boost, and at about 7-8psi the car would start to spin 2nd gear like it was driving on ice... Now, the gauge reads almost all the way down in the red, and the car is nowhere near as fast as it was when the gauge would read up in the green...
I know that the blinky a/f gauges arent very trust worthy, but before I took the kit off that thing would read green as soon as I hit any boost, and at about 7-8psi the car would start to spin 2nd gear like it was driving on ice... Now, the gauge reads almost all the way down in the red, and the car is nowhere near as fast as it was when the gauge would read up in the green...
Last edited by Hatch Man(GsR); May 10, 2006 at 06:34 PM.
Currently N/A
Joined: Feb 2003
Posts: 339
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From: Virginia Beach
Re: 10% Ethanol
And what exactly does ignition timing have to do with the amount of fuel going into the motor?
It sounds like maybe an air density problem...it's much hotter outside now then it was a few months ago. I had the same car/same setup/probably the same motor and it ran much differently (afr wise) depending on the outside temperature.
Just my .02
It sounds like maybe an air density problem...it's much hotter outside now then it was a few months ago. I had the same car/same setup/probably the same motor and it ran much differently (afr wise) depending on the outside temperature.
Just my .02
Registered Member
Joined: Apr 2003
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From: Richmond VA
Re: 10% Ethanol
Originally Posted by EvolutionBoostin
And what exactly does ignition timing have to do with the amount of fuel going into the motor?
It sounds like maybe an air density problem...it's much hotter outside now then it was a few months ago. I had the same car/same setup/probably the same motor and it ran much differently (afr wise) depending on the outside temperature.
Just my .02
It sounds like maybe an air density problem...it's much hotter outside now then it was a few months ago. I had the same car/same setup/probably the same motor and it ran much differently (afr wise) depending on the outside temperature.
Just my .02
Warmer outside temps require less fuel. The air is warmer which means its less dense and less fuel is needed. So it doesn't make sense that the warmer temps would cause his car to run leaner. Unless he has some screwed up iat correction settings, but since he is running a fmu, stock ecu, stock injectors(I assume) setup then he is still running the stock iat corrections which work pretty well with stock injectors.
SHIPRIDER
Joined: Nov 2005
Posts: 121
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Re: 10% Ethanol
well if you say your running as lean as you say then I believe that you would of blown your engine by now....10% ethanol isn't going to throw your car any leaner than before.... Its only 10 % now not any more....... I would lower the boost for right now and avoid playing the retard game that your trying right now because thats going to put a whole lot stress on the engine itself........