Boost with O2 sensors? How do I do it?
06-24-07, 11:08 AM
#1
Lexus Champion
Thread Starter
Boost with O2 sensors? How do I do it?
Ok guys well my turbo is starting to go in mid this week. I have one question though. When installing where the hell do my O2 sensors go? Am I going to have to ditch some? Drill new bungs? I will be running and ESC-1 so I know that I need at least 1 O2 to wire that in too, but where do they all go?
Thanks,
Elliott
Thanks,
Elliott
06-24-07, 06:29 PM
#2
Stock o2's or an o2 for a wideband? For stock I'd say where they normally go so you don't have to lengthen any wires, if you lost a bung due to new pipes weld some on there. For a wideband, put in the downpipe within 6-10" or so of the tubine housing anywhere from the 10 o'clock to 2 o'clock position, you will have to weld on a bung for this. I hope that is what you were asking.
06-24-07, 08:02 PM
#4
Ditch the back 2 sensors and replace them with simulators. Reason for that is because that you no longer have cats with the turbo setup unless you have some welded in.
The way I set up my car I ditched all the factory O2 sensors. The only one I have left is a Zeitronix wideband O2 in the downpipe. I get that wideband reading onto my dash. There are no O2's connected to the factory ecu at all on my car. The reason why I did it this way is to prevent the stock ecu from altering fuel trims. It's been working great for me, it's almost like the car is running like a standalone since all my fuel settings stay rock solid and never change. Obviously there is a downside to this setup...you will have to find some way to "pass" state inspections
I tried for a month to keep the stock O2's and make the ecu happy and not alter my fuel trims. In the end I couldn't manage to do that so I just pulled all the stock o2 sensors. I'm sure a more experienced shop might be able to devise some kind of hack or technique for you if you take it there to tune. I'm sticking with my method since I'm having zero problems. I got this technique from another guy here with a pretty hardcore boosted GS300. He was running like 24psi with methanol injection on stock ecu + MAPECU piggybacked!
The way I set up my car I ditched all the factory O2 sensors. The only one I have left is a Zeitronix wideband O2 in the downpipe. I get that wideband reading onto my dash. There are no O2's connected to the factory ecu at all on my car. The reason why I did it this way is to prevent the stock ecu from altering fuel trims. It's been working great for me, it's almost like the car is running like a standalone since all my fuel settings stay rock solid and never change. Obviously there is a downside to this setup...you will have to find some way to "pass" state inspections
I tried for a month to keep the stock O2's and make the ecu happy and not alter my fuel trims. In the end I couldn't manage to do that so I just pulled all the stock o2 sensors. I'm sure a more experienced shop might be able to devise some kind of hack or technique for you if you take it there to tune. I'm sticking with my method since I'm having zero problems. I got this technique from another guy here with a pretty hardcore boosted GS300. He was running like 24psi with methanol injection on stock ecu + MAPECU piggybacked!
Last edited by JeffTsai; 06-24-07 at 08:05 PM.
06-24-07, 08:55 PM
#6
Lexus Champion
Thread Starter
Ditch the back 2 sensors and replace them with simulators. Reason for that is because that you no longer have cats with the turbo setup unless you have some welded in.
The way I set up my car I ditched all the factory O2 sensors. The only one I have left is a Zeitronix wideband O2 in the downpipe. I get that wideband reading onto my dash. There are no O2's connected to the factory ecu at all on my car. The reason why I did it this way is to prevent the stock ecu from altering fuel trims. It's been working great for me, it's almost like the car is running like a standalone since all my fuel settings stay rock solid and never change. Obviously there is a downside to this setup...you will have to find some way to "pass" state inspections
I tried for a month to keep the stock O2's and make the ecu happy and not alter my fuel trims. In the end I couldn't manage to do that so I just pulled all the stock o2 sensors. I'm sure a more experienced shop might be able to devise some kind of hack or technique for you if you take it there to tune. I'm sticking with my method since I'm having zero problems. I got this technique from another guy here with a pretty hardcore boosted GS300. He was running like 24psi with methanol injection on stock ecu + MAPECU piggybacked!
The way I set up my car I ditched all the factory O2 sensors. The only one I have left is a Zeitronix wideband O2 in the downpipe. I get that wideband reading onto my dash. There are no O2's connected to the factory ecu at all on my car. The reason why I did it this way is to prevent the stock ecu from altering fuel trims. It's been working great for me, it's almost like the car is running like a standalone since all my fuel settings stay rock solid and never change. Obviously there is a downside to this setup...you will have to find some way to "pass" state inspections
I tried for a month to keep the stock O2's and make the ecu happy and not alter my fuel trims. In the end I couldn't manage to do that so I just pulled all the stock o2 sensors. I'm sure a more experienced shop might be able to devise some kind of hack or technique for you if you take it there to tune. I'm sticking with my method since I'm having zero problems. I got this technique from another guy here with a pretty hardcore boosted GS300. He was running like 24psi with methanol injection on stock ecu + MAPECU piggybacked!
06-25-07, 07:09 AM
#7
Lexus Fanatic
Ditch the back 2 sensors and replace them with simulators. Reason for that is because that you no longer have cats with the turbo setup unless you have some welded in.
The way I set up my car I ditched all the factory O2 sensors. The only one I have left is a Zeitronix wideband O2 in the downpipe. I get that wideband reading onto my dash. There are no O2's connected to the factory ecu at all on my car. The reason why I did it this way is to prevent the stock ecu from altering fuel trims. It's been working great for me, it's almost like the car is running like a standalone since all my fuel settings stay rock solid and never change. Obviously there is a downside to this setup...you will have to find some way to "pass" state inspections
I tried for a month to keep the stock O2's and make the ecu happy and not alter my fuel trims. In the end I couldn't manage to do that so I just pulled all the stock o2 sensors. I'm sure a more experienced shop might be able to devise some kind of hack or technique for you if you take it there to tune. I'm sticking with my method since I'm having zero problems. I got this technique from another guy here with a pretty hardcore boosted GS300. He was running like 24psi with methanol injection on stock ecu + MAPECU piggybacked!
The way I set up my car I ditched all the factory O2 sensors. The only one I have left is a Zeitronix wideband O2 in the downpipe. I get that wideband reading onto my dash. There are no O2's connected to the factory ecu at all on my car. The reason why I did it this way is to prevent the stock ecu from altering fuel trims. It's been working great for me, it's almost like the car is running like a standalone since all my fuel settings stay rock solid and never change. Obviously there is a downside to this setup...you will have to find some way to "pass" state inspections
I tried for a month to keep the stock O2's and make the ecu happy and not alter my fuel trims. In the end I couldn't manage to do that so I just pulled all the stock o2 sensors. I'm sure a more experienced shop might be able to devise some kind of hack or technique for you if you take it there to tune. I'm sticking with my method since I'm having zero problems. I got this technique from another guy here with a pretty hardcore boosted GS300. He was running like 24psi with methanol injection on stock ecu + MAPECU piggybacked!
I do have to say that the esc1 does a beautiful job the moment it sees any type of boost and forces the ecu into open loop.
Jeff, I'll hit you up later via PM.
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06-25-07, 08:11 AM
#9
Gsoup, the way I have it set up...with all four o2's pulled. The car runs beautifully. It almost drives as if its a factory boosted car. No stuttering or anything at any rpm range. A/F ratios are dead on all the time. I do get VERY slight variances when there is a dramatic change in weather...like if today it's 100F out and tomorrow it's 70F. It deviates a little bit but nowhere near as much as when you allow the stock ecu to trim fuel. Thats what was happening to a bunch of IS300 guys trying to get the car to run with piggybacks and allowing the stock ecu to alter fuel trims...one day perfect the next day kaboom lol.
Bighitbike, you don't need to get an OBD2 scanner. It's nice to have one, but then again it's a $200 tool that might or might not be necessary in your case. If you're gonna be pulling all 4 o2's like me then you don't really need an obd2 scanner to tell you that the 4 sensors are missing lol. If you tune with the 4 pulled o2's method, all you need is a wideband o2 and egt probe(optional) to help you tune. An OBD2 scanner is required if you are trying to tune by watching/altering the fuel trims to within the ecu's "acceptable margin"...aka: run car with all O2's and try not to get a CEL.
Bighitbike, you don't need to get an OBD2 scanner. It's nice to have one, but then again it's a $200 tool that might or might not be necessary in your case. If you're gonna be pulling all 4 o2's like me then you don't really need an obd2 scanner to tell you that the 4 sensors are missing lol. If you tune with the 4 pulled o2's method, all you need is a wideband o2 and egt probe(optional) to help you tune. An OBD2 scanner is required if you are trying to tune by watching/altering the fuel trims to within the ecu's "acceptable margin"...aka: run car with all O2's and try not to get a CEL.
06-25-07, 01:39 PM
#10
Lexus Champion
By unplug the 02 sensors you will force it into open loop. It's a quick way to fix your problem. Your stock ECU will look at the 02 sensor inputs and make corrections from there. Most people will assume the front 02 sensors are the are the only ones that the ECU will look at. Rear 02 sensors play a big role on fuel trim also.
JPI
JPI
06-25-07, 01:55 PM
#11
Lexus Fanatic
Gsoup, the way I have it set up...with all four o2's pulled. The car runs beautifully. It almost drives as if its a factory boosted car. No stuttering or anything at any rpm range. A/F ratios are dead on all the time. I do get VERY slight variances when there is a dramatic change in weather...like if today it's 100F out and tomorrow it's 70F. It deviates a little bit but nowhere near as much as when you allow the stock ecu to trim fuel. Thats what was happening to a bunch of IS300 guys trying to get the car to run with piggybacks and allowing the stock ecu to alter fuel trims...one day perfect the next day kaboom lol.
By unplug the 02 sensors you will force it into open loop. It's a quick way to fix your problem. Your stock ECU will look at the 02 sensor inputs and make corrections from there. Most people will assume the front 02 sensors are the are the only ones that the ECU will look at. Rear 02 sensors play a big role on fuel trim also.
JPI
JPI
It acts up when its really HOT outside. Other than that I mean I've reset my computer maybe 5-6 times in 3 months. My idle actually is fine. I have no problems with it at all. It's dam near perfect, at idle I don't even hear my car its that quiet. i'm also only pushing 8 lbs max so I know once i go above that I'm going to have issues.
Jeff you put O2 sims on all four? Jason, thats what you mean by unplugging them correct?
Appreciate the help fellas
06-25-07, 02:27 PM
#12
No, no o2 sims. No O2 sensors are plugged into the stock ecu AT ALL. You are gonna get CEL out of the ***(I think I have 5-6 codes lol), but this is a method to prevent the stock ECU from altering fuel trims. As Jason said, it will run open loop all the time so basically it references the fuel map only and no longer the O2s. Other than the CEL for the missing sensors, the car runs perfect and drives perfect. Hell, my mom has driven my car and hasn't notice anything different. Thats how good and close to stock driveability I have the car at right now. I haven't EVER had to reset the ecu since I used this new method. I guess it's up to you if you want to throw CEL's or not. That's the main reason why the method is used less often among a lotta the bosoted IS/GS's. The trade off I guess is being able to pass state inspections or not...but thats not too hard if you "know someone" 
06-25-07, 02:37 PM
#13
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Gsoup, the way I have it set up...with all four o2's pulled. The car runs beautifully. It almost drives as if its a factory boosted car. No stuttering or anything at any rpm range. A/F ratios are dead on all the time. I do get VERY slight variances when there is a dramatic change in weather...like if today it's 100F out and tomorrow it's 70F. It deviates a little bit but nowhere near as much as when you allow the stock ecu to trim fuel. Thats what was happening to a bunch of IS300 guys trying to get the car to run with piggybacks and allowing the stock ecu to alter fuel trims...one day perfect the next day kaboom lol.
Bighitbike, you don't need to get an OBD2 scanner. It's nice to have one, but then again it's a $200 tool that might or might not be necessary in your case. If you're gonna be pulling all 4 o2's like me then you don't really need an obd2 scanner to tell you that the 4 sensors are missing lol. If you tune with the 4 pulled o2's method, all you need is a wideband o2 and egt probe(optional) to help you tune. An OBD2 scanner is required if you are trying to tune by watching/altering the fuel trims to within the ecu's "acceptable margin"...aka: run car with all O2's and try not to get a CEL.
Bighitbike, you don't need to get an OBD2 scanner. It's nice to have one, but then again it's a $200 tool that might or might not be necessary in your case. If you're gonna be pulling all 4 o2's like me then you don't really need an obd2 scanner to tell you that the 4 sensors are missing lol. If you tune with the 4 pulled o2's method, all you need is a wideband o2 and egt probe(optional) to help you tune. An OBD2 scanner is required if you are trying to tune by watching/altering the fuel trims to within the ecu's "acceptable margin"...aka: run car with all O2's and try not to get a CEL.
06-25-07, 11:55 PM
#14
Lexus Fanatic
No, no o2 sims. No O2 sensors are plugged into the stock ecu AT ALL. You are gonna get CEL out of the ***(I think I have 5-6 codes lol), but this is a method to prevent the stock ECU from altering fuel trims. As Jason said, it will run open loop all the time so basically it references the fuel map only and no longer the O2s. Other than the CEL for the missing sensors, the car runs perfect and drives perfect. Hell, my mom has driven my car and hasn't notice anything different. Thats how good and close to stock driveability I have the car at right now. I haven't EVER had to reset the ecu since I used this new method. I guess it's up to you if you want to throw CEL's or not. That's the main reason why the method is used less often among a lotta the bosoted IS/GS's. The trade off I guess is being able to pass state inspections or not...but thats not too hard if you "know someone"
I'm going to have to try that out. Thanks alot Jeff. State inspection.. Is that a new agency?
