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Location:
nz
Registered:
July 2003
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 o2 to pyro converter and runninin 1jz without o2
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Sun, 18 January 2004 21:15
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hi guys
im wantn to try runin 1jz with o2 disconected so as to be able 2 run avgas havnt tryed it yet but wonderin if fact ecu goes into limp mode and wat efects it has on closed loop mixtures. ive been told they jst run a bit ritcher Im runin a hks pfc f-con pigy back ecu witch seems to have pretty crude closed loop controll any way course idle ect. and i been wonderin if any electronics guru has made a o2 to pyro converter if this is even posible? 4 this kind of aplication.
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Location:
Kita-Ku, Sapporo, Japan
Registered:
January 2003
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Re: o2 to pyro converter and runninin 1jz without o2
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Mon, 19 January 2004 01:01
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no idea n the ecu side of things...
you realise that oxygen sensor and pryometer are two completely distinct sensors?
oxygen sensor is a zirconia senser that measure oxygen content indirectly by the surrent generate across the nernst(sp?) cell
pyrometer is just a thermocouple. thermocouples have two dissimilar metal wires attached at one end. when the point where they connect is heated, a voltage is generated across them. there are thermocouple lookup tables for the different types around the net. type R is too hot for you (13-1500max), type N... maybe too hot (about 1200max), but K typeis okay at lower temps, and can go to 1000C.
just go and get a K-type thermocouple made up, short, with stainless steel sheath, and threaded fitting (maybe 18x1.5 so you can plug it into O2 sensor fitting). then you will also need a thermocouple reader, which are not expensive at all..
should have a good pyrometer setup for under $150
Cya, Stewart
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Location:
nz
Registered:
July 2003
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Re: o2 to pyro converter and runninin 1jz without o2
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Mon, 19 January 2004 01:27
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hmmm thats not quite wat i meant was thinkin more of sum kind of converter box that u could use to feed the computer via the o2 sensor circuit information from a pyro sensor eg the hoter the reading the leaner the mixture 2 enable the usage of leaded fuels jst an idea not even shore if its feasable
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Location:
Brisbane
Registered:
February 2003
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Re: o2 to pyro converter and runninin 1jz without o2
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Mon, 19 January 2004 01:38
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plus the lead in AvGas will eventually poison (or probably ruin) the O2 sensor.
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Location:
Kita-Ku, Sapporo, Japan
Registered:
January 2003
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Re: o2 to pyro converter and runninin 1jz without o2
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Mon, 19 January 2004 02:19
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you need to work out a few things..
first, when is the O2 active for the 1JZ. typically it is only at part throttle and cruise, since a narrow band O2 can only give back info about stoich mixtures.
second, EGT is not that good an indicator of rich/lean.. unless of course you are flying a plane with a motor that sits at steady state rpm for hours on end.
third, if you are wanting to run avgas, why would you be cruising around?? i'm guessing it will be for racing purposes??
more info is needed.
Cya, Stewart
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Location:
nz
Registered:
July 2003
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Re: o2 to pyro converter and runninin 1jz without o2
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Mon, 19 January 2004 20:11
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thanx stu yeah its jst 4 racin purposes pretty mutch most of the time i would have thought the computer would be in open loop pretty mutch only a racing car jst tryn to find out more about it def wana run avgas but im not ready 4 a dif ecu yet gota change to manual trans 1st. does any one know wat happens if o2 disconected or conected but not in exhaust.
im runing a turbonetics t58 turbo ts04 compressor p trim turbine .58 eh .55 comp h hks 256 cams&gears 4deg retard exh 2deg adv inl 40mm external gate lrg intercooler standart ecu with hks pfc fcon piggy bak ecu standard injectors&pump. jst in process of adding 2nd fuel rail with extra set of injectors to be run with a turbo link ecu and 2 bosch 910 pumps 1 per rail. exhaust is 3 inch but goes straight out bonnet only bout 400mm lng no mufflers only gona be runnin bout 13psi until get extra injectors runnin and dyno tune.
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Location:
Brisbane
Registered:
May 2002
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Re: o2 to pyro converter and runninin 1jz without o2
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Mon, 19 January 2004 23:02
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The O2 sensor is used to improve fuel economy during light load/cruise conditions. When you've got the throttle nailed (ie all the time when you're racing) the output of the O2 sensor is ignored, so I can't foresee any problems if you just remove it.
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Location:
Kita-Ku, Sapporo, Japan
Registered:
January 2003
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Re: o2 to pyro converter and runninin 1jz without o2
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Tue, 20 January 2004 02:11
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if you wanted to be snazzy, you could put a 0.5V regulator in to give a constant 0.5V to the ECU, so it thinks it's running stoich at cruise....
there may be a bit much heat from it if you run it straight from 12V, but you could tap into the 5V ref voltage for the TPS?
or just use a resistor......with a heatsink 
Cya, Stewart
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Location:
nz
Registered:
July 2003
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Re: o2 to pyro converter and runninin 1jz without o2
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Tue, 20 January 2004 04:43
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thanx 4 the input guys ill give it atry in let u know 
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