Wideband AFR questions

[HMS-S6]

I've just bought an innovate wideband kit simply to help diagnose my running fault in WOT in my S6.

1. I am told that the ecu will ignore the standard lambda reading on WOT. So can I run the wideband set up in the lambda hole just for my requirements??

2. What should I expect to see at full throttle on a stock car?

[pasbogdan]

Do you run a stock aan?

[HMS-S6]

Do you run a stock aan?

Yes mate

[pasbogdan]

If you have a boost gauge(i do not trust the dash one) and you get 0.9-1 bar of boost you should see readings of afr somewhere around 12-13:1 air/fuel.Do not remenber readings when my 2.2 was stock.

[HMS-S6]

Thank you

[prj]

This is correct, on a full stock map it will be between 12 and 13.

[HMS-S6]

Should be, but I have a feeling mines going to be way lean.

[HMS-S6]

Am I ok to run it in place of the standard lambda sensor hole just for WOT runs?

[macspring]

I would have thought you'd need / be better off having a hole drilled / cut into your down pipe, and a bung welded into place so that you could have both probes working ?

Others will advise either way, as I am only 'guessing'

btw, what's your running problem ?

[HMS-S6]

I would have thought you'd need / be better off having a hole drilled / cut into your down pipe, and a bung welded into place so that you could have both probe working ?

Others will advise either way, as I am only 'guessing'

btw, what's your running problem ?

There's a massive thread on it on here somewhere. Basically it holds back on full throttle slightly. So far I'm up to over £5k trying various things.

[prj]

Am I ok to run it in place of the standard lambda sensor hole just for WOT runs?

Sure. Make sure to unplug all the connectors from the standard lambda though, don't leave it hooked up in free air.

[HMS-S6]

Sure. Make sure to unplug all the connectors from the standard lambda though, don't leave it hooked up in free air.

Ok mate, brilliant thank you.

[slow2]

How does the cars ecu get a narrow band lamba signal?
does the lamba probe or box supplied split the signal so you end up with both narrow & wide band lamba signals.

[HMS-S6]

How does the cars ecu get a narrow band lamba signal?
does the lamba probe or box supplied split the signal so you end up with both narrow & wide band lamba signals.

I'm not sure till it arrives mate.
I just feel that, on my car I'm missing something very fundamental.

[slow2]

I feel your pain, had identical issue to yours, evereything pointed to a boost leak so
i set off and replaced all large & small hoses & where ever posible swopping out jubille
clips for clamps, things slightly improved but it still felt missing, so i embarked on a
"i will buy my way out of this" program of replacing All engine to ecu sensor (v.expesive)
and again things slightly improved but it still felt missing,
by now my mellon is well twisted and i even mistakenly begin to lay blame at
mr Newgents (where is he these days) "homefries" chips,
Well out of desperation i did another boost leak test, but this time i pressurized my inlet
system to 30psi and used soapy water on every hose joint i could see still no
joy, out comes the long cigarette and i begin to stare vacantly into the engine bay
at which point i see bubbling foam coming from around one of the dump valve port
that is threaded and screwed to the dump valve body !!!

in short what im saying is 9 out of 10 times it will be a boost leak