Ferrari Mailing List: Re: NGK Powerdex AFX Wideband O2 Air Fuel Ratio Monitor

[Martin Stark (MStark]

I guess my pos DMM is just that - no duty cycle readout. OTOH I do have 
a very old $10. dwell meter- reads in degrees if I remember correctly. 
Last used it on a 1964 Buick - gasp! Is 55% duty cycle 360 * 55%.   If I 
can just find a place to mount the readouts I'll go for the NGK AFXs and 
not have to deal with this dithering. 

On another subject, been flirting with the concept of finding maybe an 
additional 100 horseys in the old TR.  My 599 or 430 purchase is still a 
ways off. Thinking low pressure (5-6 lbs boost) turbos with modest sized 
air to air intercoolers and a modern FI/ignition controller system.  
Something that won't cook the transaxle or halfshafts. The compression 
ratio is low enough to handle a bit of boost.  Anyone gone that route?


Jim Conforti wrote:

> At 04:41 PM 4/6/2007 -0400, Martin Stark wrote:
>
> > Good info, thxn Jeff.  To answer your question concerning duty cycle
> > calculation, using an oscilloscope one could measure the pulse width and
> > establish a ratio between pulse and no pulse (on/off time * 100) = duty
> > cycle. I still am leaning towards installing a pair of NGK AFX A/F
> > monitors.  Btw, Jim Conforti says he likes them a lot and he's about the
> > most savvy guy I know.
>
>
>   As far as duty cycle, even a dwell meter can read it.
>
>   Most decent DMM's are capable of a dutycycle measurement.
>
>   Jim