LEAN at high rpm can be many things. stick to basics first.....check your fuel filter, and pump. next would be be the fuel lines. often the stock fuel lines won't handle many modifications, and may need to be enlarged.
anything at all that restricts the fuel flow, can and will cause a lean condition at higher rpms. also, check your fuel pressure regulator.

 

The car still has a catalytic converter on it, yes? Tailpipe wideband readings are worthless if so.

Go over the basics man. Fix your check engine light issues. Clean all of that excess oil out of the MAF and K&N. Give the car a tune up. Check for excessive backpressure in the exhaust. Check the clutch out etc.

 

yes it still has stock exhaust except for the e cutout after the y pipe

 

is the fuel really holding back about 50 horsepower though?

 

very highly possible

 

Catalytic Converter doesnt change air fuel by that much on the dyno....

both dynos locally that I use, I've verified that AFR is within .2 of being correct comapred to one in the pipe pre catalytic converter

and I've done this comparison multiple times....every time I do a car I get the customer an A/F reading from the dyno, but use my wideband in the front o2 bung to do the tuning


your Myth has been dispelled by hard cold facts and physically proof.

 

Beat me to it.... Correct sir Yes, pre cat to aft cat was .02-.03, seen this over and over...

 

Ok, how about you back that "I saw it on my dyno" truck up a little bit and explain to my ignorant, stupid *** how catalytic converters and oxygen sensors work then?

 

the narrow band O2 sensor does not actually measure oxygen concentration, but rather the difference between the amount of oxygen in the exhaust gas and the amount of oxygen in air. Rich mixture causes an oxygen demand which creates a voltage...

catalytic converters do not change the oxygen content in any way..... it converts the three main pollutants in automobile exhaust. It converts carbon monoxide (CO) and unburned hydrocarbons (HC), and a reduction reaction converts oxides of nitrogen (NOx) to produce carbon dioxide (CO2), nitrogen (N2), and water (H2O)

it doesn change the oxygen content...
it reduces the Demand for more oxygen to "balance the equation" so to speak

in your pre cat o2 it see's all the pollution gasses mixed in and the oxygen demand changes, creating a swing in voltage
at stoich, the pollution gasses are at a minimum..so the oxygen demand is "ideal" and you get a voltage in the 450mv range

when the Catalytic converter processes those pollution gasses...and converts them to other things, the oxygen demand is "ideal" again...creating a voltage in the 450mv range

when your cats fail and can no longer correct those pollution gasses, your rear o2's start to swing due to the new change in oxygen demand..when they go past a certain range a certain # of times, it sets an SES light to let you know



A wideband O2 is An electronic circuit containing a feedback loop controls the gas pump current to keep the output of the electrochemical cell constant, so that the pump current directly indicates the oxygen content of the exhaust gas

It will show the same oxygen content before and after the catalytic converter as it measures Actual Oxygen Content

typically you get just a few tenths of a point leaner at the tailpipe due to fresh air contamination from being so close to the exit point..


and I can repeat the example on any dyno in the country assuming their wideband is not old and out of calibration.


When you have done several hundred tunes...you tend to notice these things a little more than the end user who only knows what he has read on the internet where freedom of speech tends to let myths fly rampantly.

most people dont even know that their dual exhaust that comes from a Y pipe to a dual outlet, has tailpipes that will see different flows at different RPM's and one will read lean compared to the other.(next time you are on the dyno with your car... try a back to back pull in each pipe and notice the difference between the two)

From a Y-Pipe, a single outlet exhaust will typically do the exact same as a dual tip exhaust, and sometimes it will do better at higher rpm's... less turns inside the muffler = less restriction = more power..

 

I'm a little sorry I asked, didn't mean for you to go and type that much. This is what I wanted, really:

Now, I need to know, how do you make CO and HC into CO2 and H2O without using up O2? This is the most awesome chemical reaction I have ever heard of.

 

you realize it doesnt change the Oxygen content.. its still there, just bonded to other items...the amount of total O2 is still the same


just because you have carbon dioxide, doesnt mean that the oxygen has dissappeared...its still there... cO2

it means that the catalytic converter has allowed bonding and break down of pollutants..when they bond to other chemicals, they are no longer toxic to our environment...

like an acid neutralizing a base...all the chemicals are still there...just re-arranged

the more HC and CO it makes, the more O2 your narrowband thinks it needs to balance the equation....

the wideband just says...oh... that much exists in this packet of gas

o2 demand vs actual O2

 

but it is not seen as o2.

 

Ok E=MC^2 and a^2 + b^2=C^2

Anyways, first order of business, a simple tune-up (plugs, wires, fuel filter, PCV, and air filter) Then clean your MAF with some electrical parts cleaner, or alcohol and cotton swab (just don't break the little wires) See how she does.

Then see what kind of fuel pressure you are getting at WOT like stated above to be positive you don't have a weak fuel pump.

 

I should have said actual molecules of oxygen instead of 02 for the wideband

while a narrow band looks for missing 02 to complete the equation

the wideband looks for actual total molecules of oxygen remaining

Co2 has two molecules of oxygen that were not consumed during combustion


I'm done with trying to teach you chemistry

 

The real question should be why the hell did the dyno operator make a full pull with it that lean? Hopefully you didn't hurt anything in the motor.

 

Why is that? Did you just realize that your argument is ridiculous? Never mind catalytic converters, O2 readings would never change at all no matter how rich or lean an engine was run if you were correct. The oxygen from the combustion process would still be there, just attached to Hydrogen, Carbon and Nitrogen molecules. Humans would be able to breathe under water too, lol.

Yes!

 

i wish i'd have recorded the waveforms from the mercury sable that was running stupidly lean, thanks to the typical intake leak those 3.0's got. i had before and after.

 

Clogged cats , oliy MAF , Bad fuel pump .

Sad to see that your 1st dyno experience is a bad one..
I dynoed 332rwhp 339rwtq with 98 Z28 A4 K&N Filter ,cutout and LS6 Intake stock tune.
13:4 A/F ratio.

 

our lungs dont have the ability to unbond oxygen from complex Molecules
the oxygen is still there... Fish(and some amphibians) have Gills that can filter our and breathe the dissolved o2 in the water...not the O2 in the H2O


and ... there is actually a Fluid that has enough o2 dissolved in it for us to breathe it....
they use it in the medical field...it is especially useful for a very undeveloped premature baby who's lungs are not ready to breathe oxygen from the Air. the fluid carries enough Oxygen that it can be absobed thru an undeveloped lung until it can grow far enough to support life from air based breathing.(my mom worked in a hospital that did this treatment to extremely premature babies)

for the life of me I cant remember the name of it, but I remember its a tongue twister..LOL




I wish I had a good example is something you could understand for the difference of how a narrowband o2 works and how a wideband o2 works and why the catalytic converter doesnt change the amount of oxygen Atoms total......but until you take a Chemisty class...you will never understand how it works at a molecular level.



and hey...look...wikipedia can tell you exactly what I have already said..
http://en.wikipedia.org/wiki/Oxygen_sensor

 

im going to start by saying what ive been told then i need some feedback on what to do next. I was told that the cig/accy fuse also operated part of the ecm?

That fuse was blown at the time of the dyno.

I have since replaced the fuse with a higher 30 amp.

Now that i can plug in the obd reader it says SECONDARY AIR which is the air pump?

ive also been told the air pump is an emissions device, but does it effect the power?
OR will replacing that fuse that supposedly also runs the ecm fix my air/fuel problems and loss of power problem?

this is all in question form and im only stating what has been told to me.