AFR wideband lamba?

[*P3nfold* 0]

What does a AFR wideband lamba do and what does it give you when you supercharge or turbo?

[LiamD 0]

monitors the air/fuel ratio so you can see whether it's running rich or lean.

[*P3nfold* 0]

monitors the air/fuel ratio so you can see whether it's running rich or lean.

Thanks Liam,

If you get a remap is this still needed?

[LiamD 0]

it's at least worth getting an AFR gauge to keep an eye on it.

whoever is tuning the car or mapping it will be able to advise you a lot better than me.

have a read through this too - http://en.wikipedia.org/wiki/Air-fuel_ratio

I am no expert with this, just learning as I go along from friends who tune their own cars and lots of reading.

[CALICO 130]

if your car runs too lean the engine detonates under boost afr gauges can help give you an early warning of it running lean

[*P3nfold* 0]

Ah thanks guys, Calico are you going to run this under your setup?

[CALICO 130]

i'm not running any setup

[MaidenVR6 26]

AEM Uego wideband sensor in my car. Its a NEED to have on a supercharged/Turbo car. Not nice to have, but need to have. If you dont have it, you can thank yourself for everything. Including a melted engine and a impressed girlfriend and wallet

[*P3nfold* 0]

i'm not running any setup

I thought you was going to Turbo your car?

[*P3nfold* 0]

AEM Uego wideband sensor in my car. Its a NEED to have on a supercharged/Turbo car. Not nice to have' date=' but need to have. If you dont have it, you can thank yourself for everything. Including a melted engine and a impressed girlfriend and wallet

[/quote']

I will budget for one. Another item to the tick list lol.

Good point the girlfriend point my wife would me mad if i melted the engine.

[CALICO 130]

dont know what im doing with it now shove it in the garage and have some proper fun with the mk1

[*P3nfold* 0]

Kool so the mark 1 is back on the road?

[FishWick 21]

Wideband isn't just a gauge, it's a method to adjust fuelling "on the fly". All VAG cars from 2000 onwards run Wideband as standard with the very reliable and very common Bosch LSU4.2 probe.

All aftermarket WB kits use the same probe, but the control and calibration circuity varies in quality and therefore the quality of information supplied to the ECU can vary. You get what you pay for in other words.

With a standalone you can use wideband to properly fuel the engine more efficiently, rather than just going rich, then lean, rich, lean, rich, lean like the standard narrowband does and it can also be used full time, and not just at part throttle.

My VRT returns much more mpg than a chip tune.

[magicdave 0]

Wideband isn't just a gauge' date=' it's a method to adjust fuelling "on the fly". All VAG cars from 2000 onwards run Wideband as standard with the very reliable and very common Bosch LSU4.2 probe.

[/quote']

Narrowband also works on the fly. It's used by an ECU as a switch around lambda 1 - it's not as informative as a wideband, obviously, hence the data it gives is referred to as narrow rather than wide. I think you might be getting confused between wideband lambda and open loop control.

All aftermarket WB kits use the same probe' date=' but the control and calibration circuity varies in quality and therefore the quality of information supplied to the ECU can vary. You get what you pay for in other words.

With a standalone you can use wideband to properly fuel the engine more efficiently, rather than just going rich, then lean, rich, lean, rich, lean like the standard narrowband does and it can also be used full time, and not just at part throttle.

[/quote']

Or with other, non "standalone" management too. In fact, if you know what you're doing, certain (later than OBD2 that is) OEM management is basically like a standalone, but a lot more complicated and feature rich. Again, this is if you know what you're doing.

My VRT returns much more mpg than a chip tune.

The only way you're getting more mpg than a chip tune is if you're cruising leaner than lambda 1, regardless of the management employed. I'd personally like to see the data you've amassed from the experiment you did when you swapped out the management for a good chip tune, ran it round for a few days, then back to standalone and did the same journeys at the same time/temperature/pressure/on board fuel quantity etc.

It might be suitable for a pub discussion, but I'd hate to mislead people on a forum that's normally excellent in its sources of technical information and resources. Especially when its a potentially expensive choice.

[*P3nfold* 0]

Thanks both Kev and Dave. Hmm I am confused. From what I have read it would seem that a remap could achieve the same goal but the wideband lamba will give me more info in terms how the car is running e.g. lean, rich etc.... I am feeling this is good tool to have to at least to monitor the fuelling, the last thing I want is the engine going bang!

[craggsy 91]

Correct. If engine runs lean at high boost then engine could go pop. And that's deffo not good

[FishWick 21]

The only way you're getting more mpg than a chip tune is if you're cruising leaner than lambda 1

I do. I can run as lean as Lambda 1.16 at 80mph and 750 deg C EGT.

I'd personally like to see the data you've amassed from the experiment you did when you swapped out the management for a good chip tune' date=' ran it round for a few days, then back to standalone and did the same journeys at the same time/temperature/pressure/on board fuel quantity etc. [/quote']

Would you now. Do you seriously think I am going amass 4 years of logs and send them to you?

I didn't intentionally want to start a Standalone v Motronic debate, but it seems this is what your intention is. It seems strange that someone with so few posts has decided to target this particular thread. What's your background in ECU mapping?

I know ME7 runs wideband full time, but OBD1 and OBD2 does not. I didn't want to go into ME7 and I agree, it's extremely sophisticated and a very nice ECU.

It might be suitable for a pub discussion' date=' but I'd hate to mislead people on a forum that's normally excellent in its sources of technical information and resources. Especially when its a potentially expensive choice.[/quote']

Please. No one is being mislead. People are intelligent enough to make up their own minds and believe what they want to believe on a forum. You will notice I am the most informative person on here when it comes to this subject. If you want to share some information, please do so, but don't come on here just to pick apart people's threads without your own evidence to back it up.

[craggsy 91]

I have got to back Kev up here, I have only ever known Kev to be helpful and answers any question thoroughly. And he has backed up everything he has ever said by doing it to his own car and sharing the results.

I will add that I have never met Kev at all