I must have stumped Bosch - O2 question.
I must have stumped Bosch - O2 question.
(OP)
I called Bosch and posed this question a while ago. The tech said it was interesting and since he didn't have an answer he would make sure they come up with one and get back to me in a few days. Not one to nag it has been a few months now.
Anyway to the question:
What would the expected impact be on a WBO2 reading from the injection of around 1% liquid water (leaving 99% as the normal air/fuel mixture) in the induction charge?
Would the error of the AFR calculation be of a magnitude of less than 0.1 AFR or would it be sufficient to completely invalidate the AFR reading?
I am not sure how to get to the effect, but the answer is of moderate importance to me since I discuss end result AFRs of tuning with water injection. I don't tune to a particular AFR (tuning to the maximum whp which happens to be between 12:1 and 13:1 AFR on all engines I have tuned) with water injection but I do monitor the resulting readings.
I was accused once that the AFR readings were completely invalid while I believe that if there is any error it is of a magnitude of less than 0.1 AFR.
Ed.
Anyway to the question:
What would the expected impact be on a WBO2 reading from the injection of around 1% liquid water (leaving 99% as the normal air/fuel mixture) in the induction charge?
Would the error of the AFR calculation be of a magnitude of less than 0.1 AFR or would it be sufficient to completely invalidate the AFR reading?
I am not sure how to get to the effect, but the answer is of moderate importance to me since I discuss end result AFRs of tuning with water injection. I don't tune to a particular AFR (tuning to the maximum whp which happens to be between 12:1 and 13:1 AFR on all engines I have tuned) with water injection but I do monitor the resulting readings.
I was accused once that the AFR readings were completely invalid while I believe that if there is any error it is of a magnitude of less than 0.1 AFR.
Ed.





RE: I must have stumped Bosch - O2 question.
He can give you more info about a/f ratios, catalysts, and sensors than you will probably want to hear.
RE: I must have stumped Bosch - O2 question.
Ed.
RE: I must have stumped Bosch - O2 question.
RE: I must have stumped Bosch - O2 question.
At least this is my understanding based on my discussions with Bosch an Robert Schrader (who is immensely familar with and informative about lambda topics as toytech pointed out, if anyone ever needs to talk to someone on those topics).
Ed.
www.turboice.net
RE: I must have stumped Bosch - O2 question.
Ed.
www.turboice.net
RE: I must have stumped Bosch - O2 question.
I would refer you to the document below however. Bruce is a genius and has explained his concerns quite well in the pdf. If not an outright answer to your question, perhaps it would put your mind at ease to know that your thoughts and methods (tuning for max power and use the O2 readings as a guide only) are validated by others?
http://www.bgsoflex.com/partialp/PartialPressureConvers...
Let us know if you ever hear back from the Bosch guys on this subject!
Craig