Re: Air/Fuel ratio metres......

[mark krawczuk]

hi, if you get a diy  a/f kit, i cannot see no reason why  it wont be accurate, if calibrated against a  known   a/f   meter, e.g get a garage to  calibrate the diy kit against  their  $2000 machine....   you say   "IF the ecu is measuring mV from the sender" all o2 sensors out put in millivolts.. basically all the a/f meter is doing is  reading the mv ,then  displaying  it in a format we under stand:   say or instance the out put of the o2 sensor has a output  of  100 mv at 14.7 ( 14. 7 pounds of air to 1  pound of fuel)   , then the   a/f meter  will display 14.7  . if the sensor  outputs 50 mv then the reading would be 7.35  (7pounds of air to 1 pound of fuel  (cant remember if the mv go up or down  with increase in more or less fuel..   mark k ----- Original Message ----- From: Mark To: [EMAIL PROTECTED] Sent: Tuesday, July 08, 2003 12:09 AM Subject: Re: Air/Fuel ratio metres...... Generally you're not going to get accurate enough readings with DIY kits. I was looking into tuning my Haltech via laptop to save some $$$. For a rough tune, conservatively rich you'd be okay with a cheap unit, but if the ecu is measuring mV from the sender you need to calibrate it with something accurate like the $2,000 A/F mixture measuring devices used at Dyno workshops - might as well be doing the tune then too. Importantly if you're tuning for power and leaning off to the optimum of around 11.8:1 then you want to make sure the A/F mixtures are measuring accurately or holed piston or something before you realise what's going on. Closed-loop oxygen sensor is usually used for non-critical running during idle and cruise - NOT under max power/boost so I'd not be trusting them at this time. From another post the following link is interesting reading: http://www.techedge.com.au/vehicle/wbo2/default.htm Mark FJ1600 Canberra On Monday, July 7, 2003, at 09:24 PM, damien cm wrote: Evening List,   I have just got my FJ running and in the process of doing a basic tune on my FJ using the Micro Tech MTX8 handset. I need to know my air/fuel ratio, any ideas on how to obtain this info? I have a oxygen sensor if that helps.   Cheers,   Damo.  <image.tiff> Hot chart ringtones and polyphonics. Click here --membersozdat------------------------------------------------------- OZDAT Mailing List Please Note:- Send (un)subscribe requests to [EMAIL PROTECTED] Send submissions to [EMAIL PROTECTED] No unauthorised redistribution of this email http://www.ozdat.com/ozdatonline/index.htm http://www.ozdat.com/ozdatonline/listindex.html http://www.mail-archive.com/[EMAIL PROTECTED]/ --------------------------------------------------------------------- --membersozdat------------------------------------------------------- OZDAT Mailing List Please Note:- Send (un)subscribe requests to [EMAIL PROTECTED] Send submissions to [EMAIL PROTECTED] No unauthorised redistribution of this email http://www.ozdat.com/ozdatonline/index.htm http://www.ozdat.com/ozdatonline/listindex.html http://www.mail-archive.com/[EMAIL PROTECTED]/ ---------------------------------------------------------------------