edge Posted March 31, 2007 Share Posted March 31, 2007 What is this? All i have worked out so far is that it has something to with exhaust heat or AFR. I maybe miles out. Maybe a tech thread to let us Not so clued up newish members understand a little more. Quote Link to comment Share on other sites More sharing options...
Homer Posted March 31, 2007 Share Posted March 31, 2007 The terms refer to the range of the sensor used for Air/Fuel ratio monitoring of the exhaust gases Narrow band will typically be used for NA engines as the AF Ratio will be in a narrow band, e.g. between 14 and 16. The O2 sensor on all NA (and most turbo) cars will be a narrow band - The ECU uses the inputs from this sensor to adjust the duty and duration of the injectors (i.e. the amount of fuel they spit out on each cycle). On the Supra TT for example, another method is used to adjust the fuelling while under boost - on the jap specs the Manifold Pressure sensor, on the UK spec the Mass Air Flow sensor. Instead of using the O2 input to adjust the fuel, it uses these sensors. Now, as the owners of turbo cars we want one simple all-in-one gauge to measure the AF ratio in both conditions - off boost and on-boost. Thats where the wideband comes in. The sensor will have a range from around 9 to 18 which can then be reported on a gauge. Ideally the car should be stoich (14.7) while on throttle and under no boost, and will quickly get richer as boost pressure and rpm increase. 11.7 in generally considered the most lean you can go under high boost and rpm. Hope I got that right! Quote Link to comment Share on other sites More sharing options...
edge Posted March 31, 2007 Author Share Posted March 31, 2007 Thanks homer. Alot clearer. Quote Link to comment Share on other sites More sharing options...
ivan Posted March 31, 2007 Share Posted March 31, 2007 So I take it that we don't have a wideband sensor as standard then? Quote Link to comment Share on other sites More sharing options...
Homer Posted March 31, 2007 Share Posted March 31, 2007 So I take it that we don't have a wideband sensor as standard then? Correct Quote Link to comment Share on other sites More sharing options...
edge Posted March 31, 2007 Author Share Posted March 31, 2007 The O2 sensor on all NA (and MOST turbo) cars will be a narrow band Hope I got that right! Does it change from older style to vvti? Quote Link to comment Share on other sites More sharing options...
Homer Posted March 31, 2007 Share Posted March 31, 2007 Does it change from older style to vvti? Good question. Very much doubt it though, I think the VVTI still uses a MAP sensor. Wideband sensors are expensive items so wouldn't be included unless absolutely necessary. Maybe someone with EPC can check the part numbers... Quote Link to comment Share on other sites More sharing options...
Nic Posted April 1, 2007 Share Posted April 1, 2007 Thread for the tech FAQ section I think. Quote Link to comment Share on other sites More sharing options...
Nic Posted April 1, 2007 Share Posted April 1, 2007 Does it change from older style to vvti? The O2 sensors on the VVTi are still narrow band, but are a different part number to the earlier model. Quote Link to comment Share on other sites More sharing options...
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