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Thread: Talk about your all-time bonehead moves

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Posts: 91-100 of 113
2012-12-12 07:48:08
#91
Not quite sure how your quoting of Wikipedia's definition of an o2 have to do with how the factory ecu works.

Do you agree or disagree your discription of closed and open loop is backward?
2012-12-12 14:14:48
#92
Originally Posted by 5speed
Originally Posted by JimmyRustles
Once at operating temps the ecu goes into open loop and operates the engine on the ecm values.
O2 sensors are used to maintain stoich conditions until at full temp which helps with fuel economy. It will not cripple an engine.


You got that backward. A cold engine runs in open loop, ignoring the o2, and follows the cold engine enrichment trim and timing. At a predetermine engine temperature, say above 140F, it will then go into close loop and takes in the feedback from the o2. There's a reason why the o2 has a heater circuit.

I also don't run the the factory narrow band 02, but inorder for it too work well (good mileage, smooth running, good idle) it require a programable ecu and wideband for tuning. Not recommended if you have a stock ecu.


5speed is correct here, I was going to quote & correct you JimmyRustles but I missed the + button and forgot, it was late .

Any O2 sensor is not accurate until it warms up, this goes for Narrow and Widebands. When you cold start your car, modern day O2 sensor will heat itself up with the heating element inside of itself. This helps it read the AFR's are more accurately and sooner then non-heated units. This also prolongs the life of the sensor majorly, otherwise it would get clogged with exhaust soot.

On our chassis until the O2 sensor is not warmed up, it will not enter closed loop. This will vary on the O2 sensor that you are using. If you use the original Thimble style O2, you will have longer times before you hit closed loop. I switched out to a newer Plano style O2 and on my OBD2 car it would go into closed loop a lot sooner.

To reiterate, Open loop across board when cold, once O2 is warmed up (1-5 minutes) goes into closed loop across board.

Now we do have cold enrichment tables too, if your above 122*F and in closed loop, that enrichment table becomes 0, and ECU uses O2 feedback (source TunerCode docs). While if you don't have an O2 your generally going to run 576-256 points of enrichment on a stock bin. Thus not running an o2 is hurting your gas mileage in that area.
2012-12-12 14:18:10
#93
Talking about all time bonehead moves, Josh not knowing what he is talking about yet arguing to death about it .
2012-12-12 14:22:53
#94
my all-time bonehead move is buying a sr powered car!
2012-12-12 14:33:43
#95
Originally Posted by Keo
my all-time bonehead move is buying a sr powered car!


No it was selling my old P11 to Brad!
2012-12-12 14:34:15
#96
Originally Posted by Vadim
Originally Posted by Keo
my all-time bonehead move is buying a sr powered car!


No it was selling my old P11 to Brad!


no it was selling my first SER for $750
2012-12-12 14:38:44
#97
Originally Posted by Keo
Originally Posted by Vadim
Originally Posted by Keo
my all-time bonehead move is buying a sr powered car!


No it was selling my old P11 to Brad!


no it was selling my first SER for $750


That is a very bonehead move
2012-12-12 16:09:38
#98
Originally Posted by Keo
my all-time bonehead move is buying a GA powered car!


fixed that for you,keo.
2012-12-12 20:13:39
#99
Originally Posted by Vadim
Talking about all time bonehead moves, Josh not knowing what he is talking about yet arguing to death about it .


lol, nope, from what you and 5speed said i was right on track, was just having a brain fart kind of a day.
2012-12-15 09:05:31
#100




I was smokin weed with some friends last summer and i was going to pick up the pizza we ordered a few blocks down, like a BONEHEAD i forgot to take the boot off my rim and drove off...crushed my whole rightside fender so i bought a black one and tried to match the color with the red of my car
Last edited by b13 4 door on 2012-12-15 at 09-06-54. Reason: misspelled
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