Black dawg
Registered User
I was hoping maybe some real world experience.....the interwebs is FOS. I know some oems use them, must not work that bad. I think it could be a useful tool, a pyrometer can react to slowly.
AFR Gauge Anyone?
- Thread starter Thewespaul
- Start date
I was hoping maybe some real world experience.....the interwebs is FOS. I know some oems use them, must not work that bad. I think it could be a useful tool, a pyrometer can react to slowly.
Thewespaul
Full Access Member
If you read what I first said when I made this thread you would have noticed I said that I have IP maxed out (which is also in my sig) I also showed that I have as low as a 12.3 AFR which for a diesel is plenty of work with.
Thewespaul
Full Access Member
My AFR is pretty immediate another benefit to the O2 sensor, I think I will just use the collective tuning data from the smoke I see, the EGTs on the pyro and the AFR to figure out how much nitrous to run, with of course the addition of the seat of the pants feeling in the mix
79jasper
Chickenhawk
That's what I'm seeing. The newer diesels have them.
But there's also dpf's, cat's, no2 catalyst, etc.
I'm sure a dpf alone can smooth out the "curve."
Only one way to know for sure how it will read and react.
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FordGuy100
Registered User
I imagine most diesel O2 sensors are used to help monitor NOx emissions (excess O2 in exhaust has a pretty direct coorelation to NOx). When looking at turbo's, I dont like calculating anything lower than 16:1, because you generally get into black smoke at those points, so 12.3 means your obviously way rich. Even 20:1 should have enough diesel left over to make use of nitrous.
Thewespaul
Full Access Member
How lean do you think I could go safely with the nitrous?
FordGuy100
Registered User
Infinity:1 It will not hurt a diesel to run lean. Some diesel's can idle at 200:1. Running rich is where diesel's have problems, usually with EGT's.
How wide of a "band" is this O2 sensor?
How wide of a "band" is this O2 sensor?
Knuckledragger
blowing chunks and grabbing porcelain
OK, I forgot that you have turned up your IP. Next question, what are you trying to do? Burn lots of fuel? Make more power? Melt pistons? Not trying to make fun, just trying to get a handle on your intent. Or is it just a research test to see if a nitrous bottle would help? (help what?) It seems that if you are having problems burning off the extra fuel, why not just turn down the IP until you get higher AFRs and possibly lower EGTs? Melting pistons is probably not your main goal, but adding more oxidizer to a pool of fuel might just do that. That is exactly the thing that turbos can make happen if not regulated and checking EGTs. Introducing the nitrous is dancing to the same tune without the extra plumbing. Of course if you just shoot it for effect, you are rolling coal most of the time. I'm not sold that nitrous is an answer for any reasonable question on these engines.
Thewespaul
Full Access Member
Well of course making more power is the goal and surprisingly the truck won't "roll coal" like you would expect I blame a worn out fuel system and my engineering abilities that include 5 gallon buckets in intakes. But I would like to also see what affect the nitrous would have if any at all positive. If I break something I have a factory turbo engine waiting to go in that I scored for $400 just had to fix a head gasket...
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