lambda Sensor gauge thing.
Turbo Mini Forums

Hello.

Im building up my supercharger set up at the moment, and i have been warned to watch the fuel mixture, so thinking it would be best to fit a lambda sensor and gauge so i can keep an eye on it and correct the fuel mixture much easier. Had a quick look around and well £200+ is over budget. is there not a cheaper setup out there???

Thanks

£200 is around the going rate for a decent wide band sensor and gauge. The cheaper narrow band versions are no use at all Imo.

I spent thousands building my engine, I think a £200 sensor that could save my engine from a complete meltdown is a very small price to pay.

Its been one of the best things I have bought for the car.

Its your choice

There is another option: .

However, this is very DIY and I don't know how reliable it is.

Jean

Edited by jbelanger on 16th Nov, 2008.

http://www.jbperf.com/

http://www.doyouneedabrain.co.uk/prices.htm

wideband setups arnt cheap but worth every penny. No way i could have ran my engine like i do without my LC-1 :)

turbo 16v k-series 11.9@118.9 :)

Denis O'Brien.

Its Bat (Gav) on here that does them. Ive fitted my lambda on the turbo elbow.

Edited by matty on 18th Nov, 2008.

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1/4mile in 13.2sec @ 111 terminal on 15psi

Hi,
It 2 wires, ignition positive and an earth.
You'll need to weld a boss in your downpipe to mount the sensor in. I do those for £3.
Mount the gauge switch on and enjoy!
Cheers,
Gavin :)

VEMs Authorised Installer / Re-seller. K head kits now available!

WB/EGT gauges. Click here for customers write-up

Visit www.doyouneedabrain.co.uk

My Mini build diary

how much? hav i bought a load of rubbish then? I got a 4 wire lambda sensor for a renault off ebay for £12.50 british made as well (1 wire guage, 1 wire earth, 2 wires heaters for more accurate reading till engines warm). Then a decent old school pointy needle a/f ratio gauge from america off ebay for £40. thought that would do the trick. Should i have something different?

Hi,
You've probably got a narrow band setup, good for passing MOTs, almost useless for tuning :(
Cheers,
Gavin :)

VEMs Authorised Installer / Re-seller. K head kits now available!

WB/EGT gauges. Click here for customers write-up

Visit www.doyouneedabrain.co.uk

My Mini build diary

whats with the band thing then. I didnt really research it at all, just thought " it'd be nice to know when its running lean/rich without guessing and bought a sensor and gauge. Whats the benfits of wide band over narrow band, more range? surely narrow band tells you when mixtures ok, or is it just a rough average with narrow band. Thanks fir ur knowhow :)

A narrow band sensor only works well around stoichiometric ratio, hence it has a narrow band of operation.

A wide band sensor will show representable measurements of AFR (lambda) between 10:1 and 17:1 AFR

To tune with one of these sensors you need to be able to see acurate AFR at full throttle, the narrow band will not tell you enough information.

The narro band is only good to tell you if the fueling is rich or lean, there is no real Value to it and as such useless for tuning, but useful as an indication that something is wrong

think i get it - basically the diyers version... like the differnce between an oil pressure light an an oil pressure gauge, one tells you when somethings wrong, other tells you whats actually going on.

One final question... if my narro band sensor tells me when i'm doing 1000revs it rich, when its at 3000 its ok, and at 5000 its leaning off - what else could a wide band one tell me at those rpms. thanks for your patience at me being thick, as i've said i'm new to the subject and concept

ah i just looked at your afrs basically are you saying when your flat out and theres a lot of air (17) being sucked in and a relatively small amount of fuel (1), the wide band can still detect how much whereas a narrow band would be lost?

a narrow band can only tell you 3 states, you either have a stoich ratio 14.7:1, less than that, or more than that. a narrow band wont tell you how much less or more.

so under full throttle you want a ratio of 12.5:1 or less or you will start melting things, a narrowband will show the same output for 10:1 as it will for 13.5:1, you think your safe but your actually destroying your engine.

turbo 16v k-series 11.9@118.9 :)

Denis O'Brien.

GOTCHA. so either bin the setup, or take it down to my rollin road where they'll shove a wide band sensor up its arse, and tune it... then take note of where it sits at on my gauge straight after its been tuned and keep those readings in mind (ignoring the markings saying its too rich etc...) or am i still missing a trick

btw, i dont plan on tuning it myself, i'm just going to build it, roughly set it up, then get it tuned by the locals. I just put that gauge in to keep me safe, but it looks like it wont

Taking a note of where the narrowband gauge sits won't help because that will change with the temperature of the sensor and exhaust gas. So the AFR may be different and the gauge will still read the same.

Jean

http://www.jbperf.com/

ok then, ill bin it an buy wideband setup, until then it can sit an look pretty in my dash :cool: thanks for all your help

Hmm this looks pretty interesting!

http://www.14point7.com/

1/4 Mile 14.3secs 96Mph Terminal 10psi of boost.


Fibreglass Parts? - http://www.tdkracing.co.uk/
Split Rims? - http://www.force-racing.co.uk/

This looks like the easier one to use.

Its says that its reads between 10.18 [AFR] - 34.28 [AFR] Is this the right spectrum??

http://www.14point7.com/Widebands/JAW_1_03/JAW_1_03.htm

1/4 Mile 14.3secs 96Mph Terminal 10psi of boost.


Fibreglass Parts? - http://www.tdkracing.co.uk/
Split Rims? - http://www.force-racing.co.uk/

It does look very interesting - I wish I'd seen it before ordering all my stuff from TechEdge (which still hasn't arrived yet...)

Having said that, it looks like it's very basic, just to drive a 0-5V gauge whereas the TechEdge, Innovate etc. has all the data logging facilities I need.

Schrödinger's cat - so which one am I ???

The innovate software is great, that how me and Robert set mine up.

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1/4mile in 13.2sec @ 111 terminal on 15psi

I think i might order the kit and buy the components.

Cant hurt can it.

What does the EGT Probe do??

1/4 Mile 14.3secs 96Mph Terminal 10psi of boost.


Fibreglass Parts? - http://www.tdkracing.co.uk/
Split Rims? - http://www.force-racing.co.uk/