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Air/Fuel Ratio - "Gauges
https://www.ausmini.com/forums/viewtopic.php?f=2&t=71706		 Page 1 of 1
Author:  gafmo [ Wed Jul 06, 2011 7:37 pm ]
Post subject:  Air/Fuel Ratio - "Gauges
I'm re-designing my dash in Marcia. With a few dramers I'v had with her lately I'd love to have a Air/Fuel Ratio gauge & censer

In saying this Marcia will be going SQ sound system (Sound Quality) so the dash area will have speakers similar to Morris but I'm thinking like the Works Dash as per Morris. I have some cash coming my way also so I can go bigger and better.

I know Minimad did it but I cant find the thread :roll: but interested to see what's out their which will include the normal as well as A/F indercator
Author:  GT mowog [ Wed Jul 06, 2011 8:20 pm ]
Post subject: 
Gaf, I'd suggest you 'trial' a gauge before actually fitting one. To drive and watch an AFR gauge won't make any sence or not much. It is best logged while you drive along with RPMs and manifold vacuum (to show engine load) to make some informed decisions from the information received.

AFR gauges, while driving, will generaly fluctuate from 8:1 to over 22:1, and more rapidly than you might realise.
Author:  mini_mad_matt [ Wed Jul 06, 2011 9:09 pm ]
Post subject: 
I noticed in a Jaycar catalogue they had some various air/fuel ratio setups. I think the basic one was just a display, then the more complex one able to log data i believe. Might be worth grabbing a catalogue and checking it out if your into making your own.
Author:  Phat Kat [ Thu Jul 07, 2011 12:19 am ]
Post subject: 
GT mowog wrote:
Gaf, I'd suggest you 'trial' a gauge before actually fitting one. To drive and watch an AFR gauge won't make any sence or not much. It is best logged while you drive along with RPMs and manifold vacuum (to show engine load) to make some informed decisions from the information received.

AFR gauges, while driving, will generaly fluctuate from 8:1 to over 22:1, and more rapidly than you might realise.


There are dampened (for want of a better expression) ones available for in car use that are a bit easier to read.... if you're running steadily lean they'll show it (or steadily rich)...

.... If the car is leaning out enough to detonate you'll hear it or feel it before you can read it off a gauge (unless you're driving along fixated on your gauge, then you'll see it as its happening... but chances are you'll be watching the road.. then sitting there stunned... then remember you've got more gauges to check :) )... When tuning mixture with the LM2, you can "try" and read it off the screen as you go if you're not changing rpm and mani vacume too much and it will give you an idea(ish) but if your not holding steady, it'll jump from 7:1 to 15:1 in a flash and leave you biting your nails :P its not till you read the log and looking at the graphs that it starts making sense :lol: otherwise its just flashing numbers.

Gaf, what were the "issues" you're reffering to that you've had lately?
Author:  jester99 [ Thu Jul 07, 2011 5:53 pm ]
Post subject: 
Make sure you get a wide band sensor and wide band guage. The narrow band types only have a small window they operate inside of, thus making them go from one extreme to the other.

I researched this 1 year or so ago when i wanted one myself, and after speaking with many high level tuners, they all suggested spending the extra dosh and getting a wide band one. the better quality stuff is always more expensive.

the guage i was looking at from autometer was about 200 and the sensor and fittings was going to be about 200. from memory. :lol:
Author:  knuts2au [ Thu Jul 07, 2011 6:52 pm ]
Post subject: 
I have one of the Jaycar kits and the recommended Bosch sensor on one of my other "70's vehicles" and yes it does wander all over the place, but it does give you an idea of "trends" particulary on cruise when it does read pretty stable. recently showing and confirming a leaking manifold gasket that was making it run lean. It's only any good at steady throttle/load conditions, and would still need to be checked against a known instrument or it could be leading you up the garden path. :)
Author:  IndigoBlueCooperS [ Thu Jul 07, 2011 6:57 pm ]
Post subject: 
I purchased a meter from this mob.
www.innovatemotorsports.com
I have the hand held one. The size of a multi meter.
Comes with the wide band sensor.
Move it from car to car to assist mixture tuning.
Rest it on the lap, seat or dash and take the car for a run, watch the gauge under various driving conditions and then choose a different needle (for the SU).
It also has the ability to log the data for downloading to the PC so you don't have to remember it all as you drive.
I fix the sensor to the exhaust outlet with an extension and run the wires in through the rear window.
Have done a few minis and now the meter sits in the cupboard. No need for the dyno once you get the hang of the SU needle.
They also do the in dash gauge which sounds like what you are after.
I would recommend it, but once the mixture is right, that should be it. (I guess you can say the same about oil pressure and temperature but we keep an eye on them don't we).
Author:  gafmo [ Thu Jul 07, 2011 8:10 pm ]
Post subject: 
Cheers guys for your input. I am attentive while driving You could say defensive. In saying that i'm always looking at my gauges and I like to know whats happening before something major happens.

I'v been to a few Dyno Days and know what I'm looking for "13 through the rev range" and plenty of open roads around I have the ability to tune the AF with the HIF44 I have had refurbished to be spot on.

Thank You IndigoBlueCooperS I just now need to decide which way to go now :wink:
Author:  Mearcat [ Thu Jul 07, 2011 9:59 pm ]
Post subject: 
If you are even thinking about monitoring Air-Fual ratios, a wideband sensor is a must as it provides a much larger range of ratios. Yes they are pricey compared to some kits that use the factory (narrow-band) Oxygen sensors.

With the US dollar so crud at the moment, another option to the Innovate Motorsports set-up is PLX Devices SM-AFR Wideband. They have a physically TINY module that comes with a Bosch sensor. The great thing about this module is that it outputs a signal so it can plug into a variety of aftermarket gauges and even has a linear signal to output to any microcontrollers (it's what I'm doing for my custom mutli-function OELD display)
http://www.plxdevices.com/wideband.html
Author:  Fat Boy Dave [ Thu Jul 07, 2011 10:18 pm ]
Post subject: 
I've got one of the plxdevices ones and it worked (still does really) but the displays don't like being left in direct sunlight. Now I can only see it when driving at night and is unreadable during the day as the screen is not bright enough.
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