Air/ Fuel ratio Wideband on Carbed motor?

[USMC45]

First off here's a couple quick vids of the initial start up the other night.

http://i1099.photobucket.com/albums/...7C424D9FC6.mp4

http://i1099.photobucket.com/albums/...7FB1748FCA.mp4

It's a forged, dished pistons, H beam rods, 383 stroker with 9 to 1 compression. It's only gonna see about 6-8 psi of boost from the Vortech V3 supercharger on it. So my question is, do I need a Wideband? FAST makes one that does data logging and has (2) sensors for exhaust instead of (1) like the normal auto meter Wideband.

I also have a LS Turbo motor in my other truck and I know it's a must have in it but I have been told its not so important on Carbed motors.

Any help is greatly appreciated!
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[Marv D]

First. narrowband O2 sensors are pretty much worthless. They fit in a stock EFI application where your just tweeking the cruise to best efficiency. But to tune for power, they don't provide anything useful.

I data log with a Innovate WB O2 in each header collector and EGT's sampled from 2 cylinders of both n/a carb's race motors. And quite frankly I don't know how you'd [i]accurately and correctly[i/] tune a carb'd application without the WB02. Go look on any real engine dyno and EGT's and WB O2 is standard equipment!

Reading plugs is only a indication of what a new the plug was subject to from startup to shutoff. (idle, run, transition, WOT and shutdown) ESPECIALLY is a forced induction of anykind I'd want to KNOW what a/f Im subjecting the motor to. But maybe that's just me.

[USMC45]

Originally Posted by Marv D

First. narrowband O2 sensors are pretty much worthless. They fit in a stock EFI application where your just tweeking the cruise to best efficiency. But to tune for power, they don't provide anything useful.

I data log with a Innovate WB O2 in each header collector and EGT's sampled from 2 cylinders of both n/a carb's race motors. And quite frankly I don't know how you'd [i]accurately and correctly[i/] tune a carb'd application without the WB02. Go look on any real engine dyno and EGT's and WB O2 is standard equipment!

Reading plugs is only a indication of what a new the plug was subject to from startup to shutoff. (idle, run, transition, WOT and shutdown) ESPECIALLY is a forced induction of anykind I'd want to KNOW what a/f Im subjecting the motor to. But maybe that's just me.

Thanks for the input Marv. This is the one I am looking at getting, is this a good one or should I go with something else?

http://www.fuelairspark.com/fas/dyno...al-sensor.html
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[Marv D]

FAST is first rate equipment all the way!!! Kinda like Racpaak,, only thing not to like is the price. Unfortunately quality costs!

[Super73]

I ran an innovate, actually went through two. Was not impressed to say the least. Nothing but issues. Switched to and AEM and would never go back.
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[Marv D]

I'd have to agree Shaun.. I had a lot of issues with the Innovate at first. These last two LC-1 I bought seen to be OK so far... But the haven't been put to much test yet. **** keeps breaking

The Innovate stuff seems to work perfect in a lab setting, but the rigors of temp, vibration and voltage variation they see in the on-track racecar enviornment is another story all together. I sent 3 back and they sent them right back saying nothing was wrong with their equipment,, it was my wireing. Yeah well if I took my spare LC-1 and plugged it in to the exact same harness and it worked perfect, but 2 that came from Slummit and 1 replacement Innovate sent me wouldn't output to log.

[Wasted Income]

I'll weigh in as well...innovate is garbage in my experience. Been having really good luck with an AEM so far.

[nxtruck]

I use an AEM on mine, as well, and have had good luck with it so far.

[chevytruck1970]

Anyone using a wide band with methanol?
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[Rufton]

My AEM analog wideband works great.
Much quicker than plug readings.

[USMC45]

How many sensors is everybody running, Single or Dual?
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[69GMC910]

What would be the advantage of two sensors on a carb'd motor?
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[Rufton]

Two would give you a heads up if there is an issue on one bank. I run one.

[Wasted Income]

Originally Posted by USMC45

How many sensors is everybody running, Single or Dual?

I normally just run one, even when I was N/A. With the turbo, I just have one in the downpipe.

Originally Posted by 69GMC910

What would be the advantage of two sensors on a carb'd motor?

Originally Posted by Rufton

Two would give you a heads up if there is an issue on one bank. I run one.

Yeah, for instance a bank that has a misfire on one or more holes will show more lean than the other side.

[Marv D]

I run one in each header collector (n/a drag motors) But then I data log EGT's in 2 primaries and the 2 AFR's and oil temp and and and.. in a bracket class where 0.00x lights and 0.015 over your dial can = a loss,,, you need every bit of help being consistant as possible.

If your just looking to tune for best power and cruise efficienty and monitoring a gauge, I would think one would be as much as you can keep any eye on anyways.

[Hertzdaddy]

You could always put a bung in each header and enough lead wire on the sensor to switch it around when you wanted. That way you could check if there were any initial problems and be prepared for any future issues.

[Billett]

Originally Posted by Hertzdaddy

You could always put a bung in each header and enough lead wire on the sensor to switch it around when you wanted. That way you could check if there were any initial problems and be prepared for any future issues.

I'm looking to do this exact thing with my lq4 swap. The Doug thorley headers already have o2 bungs welded in, so would I just get one normal o2 sensor and one wideband so I can swap them? I'm just learning about tuning and for the cost of a mail order and the normal set of o2 sensors it seems better to just get the software myself.
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[Wasted Income]

I would get a plug for the "other" bank. O2 sensors don't like to be just hanging out in the exhaust without being powered up...they tend to die fast that way.

[Billett]

I meant a wideband that doubled as a narrow. That way I could run both at all times and swap sides for tuning. I suppose I could just plug one, but wouldn't I have to run in open loop all the time if I did that? I honestly have no idea what that is but from what I've read it isn't the preferred way to do things.
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[Wasted Income]

All i ever run is open loop....hence my opinion.

[Billett]

Do you still run a MAF or speed density? I plan on sticking with maf i was just curious. And I know you are turbo'd but in your opinion would running open loop bring down the mileage significantly? I realize these trucks aren't really built for mileage but if its only 1-2 mpg I don't care. If its more like 3-5 mpg less I might think otherwise
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[Hertzdaddy]

Originally Posted by Hertzdaddy

You could always put a bung in each header and enough lead wire on the sensor to switch it around when you wanted. That way you could check if there were any initial problems and be prepared for any future issues.

My original post was in reference to a carbed motor. I would plug the unused bung in that case.

I gots no suggestions for you efi guys.

[Wasted Income]

Originally Posted by Billett

Do you still run a MAF or speed density? I plan on sticking with maf i was just curious. And I know you are turbo'd but in your opinion would running open loop bring down the mileage significantly? I realize these trucks aren't really built for mileage but if its only 1-2 mpg I don't care. If its more like 3-5 mpg less I might think otherwise
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I honestly don't give a **** about MPG. It's my fun toy. All I care about is going fast and making noise.

[GMR-PERFORMANCE]

Daytona twin tech makes a kit ( I use it every time I dyno tune) and you can go out and log with it.. so you can a more stable look at whats going on.. NB sensor can be used however when you drop the MV down in the low 900 range the sensor is way far to one end, however a WB is a slower reading sensor than a NB.. Another thing you can so is figure how much a jet swap is giving you and use the NB down to 14.0 and then calc out the rest.. EGT is another way to get the job done..