LT1-LT4 Modifications 1993-97 Gen II Small Block V8

best place to put in a wideband

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Old Feb 11, 2010 | 03:32 PM
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Default best place to put in a wideband

hey guys, ordered me a wideband last night, since i have long tube headers and ory...where is the best place to get a bung welded in? Thanks
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Old Feb 11, 2010 | 04:02 PM
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I would put it after the merge in the y pipe.
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Old Feb 11, 2010 | 04:52 PM
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Originally Posted by CRAZZ28
I would put it after the merge in the y pipe.
wouldn't that make it not read right?
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Old Feb 11, 2010 | 04:57 PM
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I have mine on the bank 2 y-pipe before the merge. I'll be adding another sensor for the bank 1 at some point.
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Old Feb 11, 2010 | 04:58 PM
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Originally Posted by CRAZZ28
I would put it after the merge in the y pipe.
Why would you want to do this. A wideband still operates like an O2 sensor does in the sense that it needs the heat and closer to the exhaust ports.

To the OP if i were you i weld on a bung on each side right behind the collector on the ORY. This way you can get reading from both side, upon trying to tune the car. IMO
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Old Feb 11, 2010 | 04:59 PM
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Beat me to it RamAir95TA
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Old Feb 11, 2010 | 05:07 PM
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actually my lc-1 wideband says right in the instructions that it can be further back. just cant get cold air to the sensor. Mine and a couple buddies have worked just fine behind the merge in the y pipe.
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Old Feb 11, 2010 | 05:16 PM
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but you really are not getting that good of info with it back there. You are getting a mixture of 8 cylinders way back there. How accurate do you think that is? When you do it per bank you are getting info for two at a time to get more usable information. This is why they sell dual widebands as well as per cylinder wideband(8/10 sensors). Why would they make these if installing them halfway down the exhaust system once everything has merged together is information good enough to tue a vehicle?
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Old Feb 11, 2010 | 05:25 PM
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but you really are not getting that good of info with it back there. You are getting a mixture of 8 cylinders way back there. How accurate do you think that is? When you do it per bank you are getting info for two at a time to get more usable information. This is why they sell dual widebands as well as per cylinder wideband(8/10 sensors). Why would they make these if installing them halfway down the exhaust system once everything has merged together is information good enough to tue a vehicle?
well let me ask you this, do you have tuning software that will let you individually adjust the A/f ratio on every cylinder? What about both banks even? Cuz my software allows pulsewidth adjustments but only as a whole. I believe you need a standalone fuel system to control it all individually. Also the single wideband "wayyy back in the y pipe" works just fine on my friends 620 hp procharged 383 trans am.
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Old Feb 11, 2010 | 05:33 PM
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There are many tuning software that allows for this. I do not have personal experience on my vehicle, but have worked and many others in which we do this with. That may be correct with your buddies but it doesnt mean that everything is at its optimum efficiency. Im not trying to be a dick by any means, I am just trying to state what i have seen. known to be true.
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Old Feb 11, 2010 | 05:39 PM
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There are many tuning software that allows for this
Could you give me some examples of this? I do have tuning experience and i was under the impression that the lt1 pcm could not function like that. And that fuel changes had to be for all cylinders.

Im not trying to be a dick either. Just sharing what I KNOW will work and is the most simple and cost effective.
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Old Feb 11, 2010 | 06:00 PM
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yeah i bought only a single wideband....i am on a budget and with the tunercat program and wideband...that is enough since i just bought umi lower control arms and single adjustable panhard bar....and new plug wires...i had a guy on ls1lt1 suggest putting it on the drivers side..a little after the regular o2 because the drivers side reads a little leaner..there for it is safer to tune.. is this true?
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Old Feb 12, 2010 | 10:25 AM
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Yeah, typically #7 runs the leanest or so I've heard. I think its the last one to get fuel?
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Old Feb 12, 2010 | 12:46 PM
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yeah i think i am going to place it on the drivers side
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Old Feb 12, 2010 | 03:38 PM
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Yup... drivers side is the way to go if only running one side. The guys from Nitrous Outlet confirmed this for me.

If a side is going to run lean, it will be that side first.
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Old Feb 12, 2010 | 08:41 PM
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that is what i am going to do since i am new to tuning by myself
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Old Feb 13, 2010 | 12:11 PM
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I need to correct myself... just saw the thread again and realized that I said "drivers side"

That is wrong, I think the guy that posted before me got the drivers side stuck in my head. Either way... I was told the Passenger Side is the one that will run lean first.

Sorry for the confusion.
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Old Feb 13, 2010 | 04:59 PM
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haha ok...well that changes a few things...go thing i have not installed it yet
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Old Feb 13, 2010 | 05:12 PM
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I've still always heard its the driver side that went lean first. #7 is the last cylinder to get fuel. Just ask in the nitrous section, they would know for sure.
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