> I have two widebands and I tune a lot of turbo'd and supercharged cars
> and they are indispensable.
For situations like that, where the fuel curve has to be altered, I agree
that a wideband O2 sensor would be a great help.
> I only have two Triumph customers and one of them was quite happy with
> with his own tune on his carbs,
> I finally persuaded him to let me use my wideband and he could see for
> himself how far off his wot a/f ratio was.
> His a/f was between 17:1 and 18:1 and he thought the car ran just fine,
> we did a lot of tuning and brought that down
> to about 12.5:1 and he went from 115 SAE hp to 142 hp at the wheels.
But note that even a narrowband O2 sensor would have gotten him much more
power ... at least on the rich side of 14.7 to one instead of way out on the
lean side.
> Anyway, I feel some of you more serious racers could benefit from this
> technology.
It's on my wish list !
BTW, Ron's chart didn't make it out to the list (which blocks all
attachments including all forms of graphics). He sent me a nice chart
purporting to show the response curve of a narrowband O2 sensor, with the
entire range of response located between 14:1 AFR and 15:1 AFR. However, it
didn't include the effects of exhaust backpressure and sensor temperature,
both of which I understand distort the curve substantially.
Randall
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