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ok i just ordered a full exhaust, and ive been reading about o2 sensor CEL's
and I thought why cant a resistor be used?\
ok what I think is before i install the exhaust, find the 02 sensor Signal wire the one that sends signal to Ecu, and with the car at normal temps and idle check the voltage.
After Doing the Full exhaust (test pipe included) check the o2 sensors voltage at idle and normal temps again.
Then running to radioshack and putting a resistor inline between the o2 and ecu.
All this To keep the CEL from coming on.
Has anyone done this? seems like it should work due to the second o2 sensor is for mainly emissions, not as much for drivability as the First o2 sensor.
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The best thing to do is not just put a test pipe there. A high-flow cat works much better and allows the minimal backpressure that is required, which on any car is 1 to 3 lbs minimum. IF you have the extra cash to spend, a Cobb accessport will take care of that problem.
The best thing to do is not just put a test pipe there. A high-flow cat works much better and allows the minimal backpressure that is required, which on any car is 1 to 3 lbs minimum. IF you have the extra cash to spend, a Cobb accessport will take care of that problem.
Please explain how backpressure is beneficial in any way or form.
Don't help spread false notions just because your buddies maybe once said that yo, backpressure is cool!
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Enlightenment is man’s leaving his self-caused immaturity. Immaturity is the incapacity to use one's intelligence without the guidance of another. Such immaturity is self-caused if it is not caused by lack of intelligence, but by lack of determination and courage to use one's intelligence without being guided by another. Sapere Aude! - Immanuel Kant
since this guy did not search I am going to go ahead and assume he did not read the FAQ on that site either. Probably not his best option.
Quote:
Q:
I built the project but I have to fiddle with the **** all the time.
A:
The car eventually will get too rich or too lean because it isn’t using the oxygen sensor anymore. This is a diagnostic aid, not a long-term replacement for an oxygen sensor.
actually i did search and yea that option is useless because its needing of constant adjusting
I just dont see why the ecu would need to make adustments from the second/downstream sensor.
the upstream sensor is what the ecu uses for feedback on just about any car,
the downstream is mostly to monitor the efficiency of the cat, just like when the COBB masks it, it pretty much ignores it because it isnt really usefull for the engine to run, That's what the upstream is for.
So i dont see why dropping the signal to a range that is " normal" for a functioning cat
I.E,,,,random numbers used..... stock car might have 2 volts or .8 ohms depending which one it goes by for a warmed-up idle .... with a test pipe if it reads 3 volts , i know id need a 1 volt resistor... or if it read 1.5 ohms with test pipe id need to have a .7 ohm resistor....
All this is theoretically, of course it would drop signal on a linear scale which may be the issue.
since this guy did not search I am going to go ahead and assume he did not read the FAQ on that site either. Probably not his best option.
Yea in that example the guy is actually using the circuit on the upstream, surely it would need to be modified a bit to work on a downstream but it is a start for anyone who wants to take up the challenge :D
My buddies did not tell me that. I am not some idiot who knows nothing about cars and I am not spreading false notions. I happen to be a professionally train auto tech. with about 10 years experience. How someone took out of what I said that you need lots of backpressure is beyond me, but people have to have a reason to say something, just how it is. Exhaust balance is important, just a fact.
Exhaust balance is, backpressure isn't. The trade off is between total exhaust flow and exhaust velocity.
Backpressure means very little if not directly nothing.
__________________
Enlightenment is man’s leaving his self-caused immaturity. Immaturity is the incapacity to use one's intelligence without the guidance of another. Such immaturity is self-caused if it is not caused by lack of intelligence, but by lack of determination and courage to use one's intelligence without being guided by another. Sapere Aude! - Immanuel Kant
Back pressure is pretty pointless and a moot discussion point. The leading myths about back pressure are that it creates more torque, and or prevents your valves from burning up.
I'll start with the valves, it's not true as valves burn up due to the engine burning lean. Secondly, we have no valves, so who cares.
As for the torque, if an engine produces power by moving air through the engine at a peek velocity, then how can a restriction in an exhaust system ever relate to "more power". Again, power is determined by the AFR and overall velocity of the air flow through the engine and out the tail pipe.
Back pressure acts as nothing more than a restriction to flow.
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My buddies did not tell me that. I am not some idiot who knows nothing about cars and I am not spreading false notions. I happen to be a professionally train auto tech. with about 10 years experience. How someone took out of what I said that you need lots of backpressure is beyond me, but people have to have a reason to say something, just how it is. Exhaust balance is important, just a fact.
the problem is some guy gets a little experience and suddenly he is an expert on everything, even though the circumstances behind the situation are entirely different, which in turn leads to a different end result. Your earlier post is wrong on several levels whether you want to be open minded to the idea or not.
you still have much to learn, grasshopper ....
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Es gibt keine verzweifelten Lagen, es gibt nur verzweifelte Menschen.
- Heinz Guderian
So i dont see why dropping the signal to a range that is " normal" for a functioning cat
I.E,,,,random numbers used..... stock car might have 2 volts or .8 ohms depending which one it goes by for a warmed-up idle .... with a test pipe if it reads 3 volts , i know id need a 1 volt resistor... or if it read 1.5 ohms with test pipe id need to have a .7 ohm resistor....
All this is theoretically, of course it would drop signal on a linear scale which may be the issue.
Search around there was a post that said the voltages it uses I think, I do not know where the post is but I believe it was by MazdaManiac. Like others said its been covered A LOT so just check around. Any idea you have has probably already been tested and shot down, but if it has not then please make what you want and let us know the results.
Just use google to search this site, if you are not then thats why you have had trouble.
My ex brother in law is ASE certified and has been a tech for 20 years or so and has told me on more than one occasion that torque wrenches are not needed if you are experienced Hence why only I work on my car. Just because you have been doing something for a long time doesn't make you good at it.
Ok i have just been using this sites search function. the google Idea is already showing me better results,,, maybe that should be a sticky to search google instead
Actually, I am very good at what I do. I never said backpressure created torque or that it was great for the engine. You want as little backpressure as possible, I am very aware of that. I was trying to help him find an easy alternative to messing with the O2 sensor, by just doing what has been proven to work, which is a test pipe or high flow cat, and a Cobb accessport. It was not a question of openmindedness, because a lot of people who turbo use a straight pipe since the turbo creates any restriction on the exhaust that is needed, as I have done installs on other cars like that which worked great with a tune. I am openminded to any proper installs that have been proven to work. I mentioned my experience since the reply about just believing what my buddies told me was pretty much saying I was a dumbass who knew little about cars, and I never said anything that shot down another's recommendation.
Also, if you feel that someone has posted something that you may know a better solution to, then post what it is and why it is better so the person seeking help can try and apply that solution, which is the purpose of the thread. It works a lot better than insults, and I am sure the person starting the thread appreciates it a lot more.
if you don't want to have something commented on out in the open then you would best start by not putting it out there in the first place. You are not the only person who has been around and seen a few things. We have discussed this ad nauseum in the past. Nobody is inclined to keep bringing up past information, especially to someone who makes authoritative yet incorrect statements.
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Es gibt keine verzweifelten Lagen, es gibt nur verzweifelte Menschen.
- Heinz Guderian
It doesn't matter if I want someone to comment or not, but there was a misperception of what was said, I was trying to be nice and help him, but I know, it is not the person who makes a nasty comment, but the one who reacts to it. I guess the only statement you thought was incorrect was the backpressure comment, but the one about the accessport and exhaust was true, not because I said so, and how is it authoritative. If you don't want a reaction, then dont make a stab at them without knowing them.
Hence why only I work on my car. Just because you have been doing something for a long time doesn't make you good at it.
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