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dakota49
Dodge Dakota
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5/12/2007
09:53:53
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 Subject: RE: New halo's great
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88 dakota 3.9 5speed 4X4 I had my Halo's in my mail box Friday afternoon will install them this morning. I am hoping I get just one more mile per gallon, and it will help run a little smoother. I'll let you know what happens
Dakota49
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Dan M
Dodge Dakota
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5/13/2007
18:04:33
| RE: New halo's great
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Hey larry,
this weekend I took a trip and logged my O2 sensor values on my laptop. I then imported this into excel and did a graph for the upstream and downstream O2 sensors.
Granted this is not a perfect method since my sampling method was not as granule as I would like (best was 7 data points a second). when you are using the osciliscope, how often are you viewing the voltage as waves? 100 times a second?
But I summed up the voltage for each O2 sensor and divided that number by the number of times I collected the data and then divided that number by 2 to get my AVG voltage (should be .45 according to information I found) and I found the following.
upstream O2 AVG V .4826
downstream O2 AVG V .5087
This tells me my upstream O2 is slightly rich and my cat is slightly inefficient (granted it has 75k miles and if i'm running slightly rich, i can see it going bad). I saw this about my CAT when I recently had an inspection done to get my new tag for the year.
I was curious and wanted to see what I could find using the software I have. I wonder if any of the pay software has any more granule logging? Technology is great!
When you are looking at the NGK sensors, how different is it from the bosch? Is it just a smoother wave and not as jumpy?
- Dan M
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Bob Lincoln
Dodge Dakota
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5/14/2007
08:19:19
| RE: New halo's great
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Something's wrong there. The downstream sensor should not be richer than upstream, even if the cat's not working.
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Dan M
Dodge Dakota
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5/14/2007
11:07:25
| RE: New halo's great
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I agree it should not be more. My problem is I'm still not sampling very many times per second. I don't know how far off the data is.
I'm going to monitor it again with my handheld scanner (I can see both up/down sensors on the same screen).
tonight I'll check the cat when I get home. a nice drive in ATL traffice will heat it up nicely.
- Dan M
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Bob Lincoln
Dodge Dakota
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5/15/2007
08:17:02
| RE: New halo's great
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Even if you can't sample many times per second, extending the measurement time can compensate for this to a large extent.
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Dan M
Dodge Dakota
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5/15/2007
10:18:06
| RE: New halo's great
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I hooked up my handheld scanner for a nice little 35 minute drive yesterday watching both the up and downstream sensors.
upstream is eratic, I've ordered a new one. downstream was a little eratic at times and consistant at others. when it would be consistant it would either be .3v or .7v.
I found another software package that can sample more times per minute- around 10.
I found a fairly cheap commercial package that I may purchase one that can do 25 times per minute if the vehicle can process the request that fast.
this is cool stuff. It was enjoyable seeing Closed loop, using O2 sensor change to driving conditions when I hit WOT. I also noticed that my IAT was steady around 124 deg - I'm going to see what I can do to drop that a little.
- Dan M
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