Wideband sensor location for F/I
02-16-2005, 09:43 PM
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I just got this private message
Always mount the O2 After the turbo if your looking to read air fuel ratio. If you put it before the turbo the exhaust back pressure will raise the egt temps and give a false reading. If your looking to install O2's for the stock computer you can put one in the crossover and the other three in the downpipe. If you using ls1 edit for tuning install one before and one after and shut the rears ones off.
02-16-2005, 10:57 PM
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We have run 2 widebands in both locations on the same car at the same time, and readings were the same. I thought running it after the turbo would also be the best thing to do, but that was not the case. Now if the turbo system sucks, then yeah you may get exagerated EGT's which would skew readings, but for most setups before or after doesn't matter.
Jose
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02-17-2005, 08:32 AM
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Jose,
I have never tried to run in front of turbo. It seemed that it would work until we talked to Bosch about sensor location. It seems that backpressure causes there sensors readings to vary. After checking with a few other manufactures we came to the conclusion that after the turbo was the right spot.
Kurt
I have never tried to run in front of turbo. It seemed that it would work until we talked to Bosch about sensor location. It seems that backpressure causes there sensors readings to vary. After checking with a few other manufactures we came to the conclusion that after the turbo was the right spot.
Kurt
Originally Posted by JZ 97 SS 1500
We have run 2 widebands in both locations on the same car at the same time, and readings were the same. I thought running it after the turbo would also be the best thing to do, but that was not the case. Now if the turbo system sucks, then yeah you may get exagerated EGT's which would skew readings, but for most setups before or after doesn't matter.
Jose
Jose
02-17-2005, 09:27 AM
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Kurt, to me I also agree to put it after the turbo. More then likely with time the excessive heat may get to the sensor when mounting it before. I do tune my GN with it before the turbo though, but only cause I don't have provisions for it after the turbo. Even though we did and have run them in both locations without a problem, I get a warmer fuzzy feeling if its mounted after the turbo 
.
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02-17-2005, 11:31 AM
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Always mount the O2 After the turbo if your looking to read air fuel ratio. If you put it before the turbo the exhaust back pressure will raise the egt temps and give a false reading. If your looking to install O2's for the stock computer you can put one in the crossover and the other three in the downpipe. If you using ls1 edit for tuning install one before and one after and shut the rears ones off.
Is this correct? What about no cats? Do you have to turn them off or use o2 sims or just put them in?
I did find out from FJO that wideband o2s are pressure sincesitive. And they recommend putting them in the down pipe. Also without a cat they recommend anywere in the pipe but at lease 18 inches from being in free air.
Ricky
Is this correct? What about no cats? Do you have to turn them off or use o2 sims or just put them in?
I did find out from FJO that wideband o2s are pressure sincesitive. And they recommend putting them in the down pipe. Also without a cat they recommend anywere in the pipe but at lease 18 inches from being in free air.
Ricky