RICH OR LEAN>>>

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drifting240
Posts: 70
Joined: Tue May 20, 2003 4:55 am
Car: computers, basketball

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how do you know if you are running rich or lean??? someone please help me understand that...thanks again..


Nismo_Freak
Posts: 10314
Joined: Wed Jul 24, 2002 10:42 pm
Car: 89 Nissan 240SX

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drifting240 wrote:how do you know if you are running rich or lean??? someone please help me understand that...thanks again..
A wideband 02 ... or by inspecting your spark plugs. EGT's can tell you as well.

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PoorManQ45
Posts: 16676
Joined: Fri Jul 02, 2004 5:13 pm

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Rich = too much gas parts to air parts

Lean = too much air part to gas parts.

If your aif/fuel ratio strays to far from 14.7 to 1, you will need a wideband O2 sensor.

DAEDALUS
Posts: 5421
Joined: Mon Jul 22, 2002 8:50 pm
Car: 1990 Infiniti Q45

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Plugs are the best way to tell overall, long-term condition. O2 signal is very erratic. If the car is running right it'll go rich-lean-rich-lean very fast. Only if there's a problem will it stay on one side or the other, and if it does, you won't need a wideband for that. Close to 1 volt, it's rich. Close to 0 volts, it's lean. Many cars are balanced at .45volts (perfect mixture), not sure about yours.

drifting240
Posts: 70
Joined: Tue May 20, 2003 4:55 am
Car: computers, basketball

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ok thanks man...i am running stock ecu..i think i have to upgrade in order to get a wideband on it...but thanks...

crzycav86
Posts: 3836
Joined: Tue Aug 05, 2003 1:28 pm
Car: 93 Nissan 240SX KAT

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You can keep your stock ecu.

The wideband just tells YOU what the air/fuel is. It doesn't tell the computer anything!

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themadscientist
Posts: 26254
Joined: Tue Nov 12, 2002 3:30 pm
Car: R32 GTR, DR30 RS Turbo, BRZ, Lunchbox, NSR50 Sportster 883 Iron
Location: Staring down at you with disdain from the spooky mountaintop castle.

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I have found spark plugs blowing the center ceramic out to be a keen indicator of mixture. I don't think you want to try that though

a lot of the wideband meters have an extra plug on the sensor so you can drop it in where the OEM sensor was and use the wideband to also send signal to the computer. It's a nice feature otherwise you are welding in a bung for the wideband sensor.


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