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

[Martin Stark (MStark]

Yes, I do.  Must have been plenty warm in the passenger compartment.  I 
don't believe he had intercoolers either. 

Charles Perry wrote:

> One of our original listers (you probably remember him, Marty) did a
> similar low pressure turbo to a 512 Boxer. Norwood did the conversion
> for him. Took a little while to get the bugs out, but Adam was very
> pleased with the car afterwards. Wish I'd had the money to buy it when
> he got tired of it... :-)
>
> -- charles
>
>
> -----Original Message-----
> From: Martin Stark [mailto:MStark [at] Copper.net] 
> Sent: Friday, April 06, 2007 8:06 PM
> To: Charles Perry
> Cc: 'The FerrariList'
> Subject: Re: [Ferrari] NGK Powerdex AFX Wideband O2 Air Fuel Ratio
> Monitor
>
> 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
> >
> >
> >
> >    
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