Tuners are you using narrow-bands to tune?
11-29-2011, 02:37 PM
#21
I thought I saw on here somewhere were a sponsor was modifing the factory PCm some how. I know they open it up and ad or change some things to it. I do not remember what the added hardware did for you or if it added WB control to the factory PCM.
You are right, it would be nice if we could utilize a WB with the factry computer. I only wish someone made an aftermarket PCM that would drive the factory dash. I know of several that will or do control the 4l60's and 4l80's but none that will also control the dash. That is they only reason I have not gotten away from the factory PCM even though I should. I have not found a solution for the Dash yet.
You are right, it would be nice if we could utilize a WB with the factry computer. I only wish someone made an aftermarket PCM that would drive the factory dash. I know of several that will or do control the 4l60's and 4l80's but none that will also control the dash. That is they only reason I have not gotten away from the factory PCM even though I should. I have not found a solution for the Dash yet.
12-01-2011, 12:09 PM
#23
You can use them to log WOT but I would only suggest NA applications. Should most people -no. You have to know what your looking at. A tuner should use a wideband to verify/set everything.
For my personal NA cars I've always just gone by the nrrowbands. When checked on the dyno the A/F's were correct.
For my personal NA cars I've always just gone by the nrrowbands. When checked on the dyno the A/F's were correct.
12-02-2011, 07:30 AM
#25
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A common misperception of narrow-bands are that they work at or around 14.7 to 1 AFR and it has nothing to do with that. GM uses narrow bands for E85 vehicles with the Stoich of 9.7 to 1. The narrow band have a shorter area that they can control the fueling. This narrow band if about .5 up and down from the set switching Stoich. I didn’t say it couldn’t monitor the EQ of the AFR. If you know how the O2 will respond to the target EQ then you can use a narrow band it just won’t control the fuel, but you’re in PE anyway
12-02-2011, 12:55 PM
#27
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I was refering to a DTC like this
The PCM detects that the HO2S 2 signal voltage remains below 550 mV during power enrichment (PE) mode and the Air Fuel Ratio parameter is below 12.5:1 for more than 25 seconds.
12-02-2011, 08:44 PM
#28
But by that you meant that the computer would not use the narrow band to change fuel trims I assume. But I guess a better way to put it would be you are in closed loop anyway so the narrow band will not control the fuel trims.
12-05-2011, 10:47 PM
#29
12-05-2011, 11:20 PM
#30
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A NB tells you only 2 things, you are richer than stoich or leaner than stoich. Nothing more. Doesn't matter if you are running Nitromethane with a 2:1 AFR. Doesn't matter, the way a NB works it doesn't care. Diesel would be fine, it just doesn't matter. It only tells you rich or leaner than stoich.
12-06-2011, 06:39 PM
#31
Any competant tuner would tell you HELL NO! Would you ask for a dyno tune without a wideband? Spend the extra $250 and buy a wideband. Your already in atleast that even if you purchased your tuning suite used. Protect your $1,500+ motor ya goofs, seriously!
