aem wideband

[Flaminsam]

agreed charl.

basically you want the sensor as near to the engine as possible. the whole 36" thing is a bit of a guide line thing any who.

yes the lambda or oxygen sensor does affect fueling so taking it off will effectively set your ecu to a kinda closed loop method.

basically the ecu has default settings at a certain throttle opening with a certain voltage coming from the MAP it will inject X ammount of fuel at XXXX revs. the lambda fine tunes that.

if your engine is not sufficiently burning or using up all the oxygen that it has taken in on the induction stroke it will pass unburnt oxygen into the exhaust. the lambda "sees" the unused oxygen and tells the ecu to richen up the mixture to attempt to burn the oxygen off.

again with charls first comment on this post, you want as few gaskets between the exhaust port and the lambda as possible. that way you have lesser chance of any "unmetered" oxygen getting in from around the exhaust.

for instance if you have a cracked manifold your engine will run rich due to the exhaust manifold ''sucking'' air in. i know a exhaust blows but for a split second the exhaust will suck as the venturi effect kicks in. effectively the flow of your exhaust will drag air in.

it is quite hard to explain exactly how it works without diagrams etc.

[Sparky]

DO NOT get rid of the Lambda

Get it welded in after the gearbox just like Jamie has shown, needs to be at a slightly downward angle aswell say 10 degrees from vertical