Megasquirt: sensor files

[vwtype53 at yahoo.com (Ben Harder)]

Dan,

 Thanks for the explaination... I now completely understand what you
are saying.   
 I remember a while ago I was messing around
with making one of those "16v fuel enrichment modules" that don't
really work... anyhow, I do recall consulting a resistance vs. temp
chart in the 16v Bentley manual.  This chart may be what we need
for accurate inputs to MS.  Yes?

And Dan, my mk2 16v has found a new home with fellow lister Don Walter.
I look forward to seeing the car again hopefully at Cincy this year...
can't wait to see its progress.

Ben


--- Dan Bubb <jdbubb@ix.netcom.com> wrote:
> I wasn't clear.
> It's not that the VW sensors are not accurate enough. The problem is
> accurately determining the
> resistance at various temperatures to input the data into Megasquirt.
> I did boiling water, freezing water and room temp with the sensor sitting
> over a heat register
> blowing ambient air. i.e. heater and AC not on.
> Despite trying to be as accurate as possible the resistance varied quite a
> bit during these
> measurements. With the sensors installed and MS running the engine temp
> normally maxed out at 180
> degs which I think is probably low. So, that is the basis of my statement.
> Maybe somebody else can do a better job of measuring the resistance than I
> did.
> All of this really only applies to the coolant sensor anyway since the 16V
> has no air temp sensor.
> And if you think about it the accuracy of the coolant temp sensor isn't very
> important. It isn't
> used for mixture control unless you're cold running and then you can put in
> any % in the warm up
> bins that your engine needs.
> So, now having thought about it using the stock sensor is adequate for
> coolant.
> OTOH, a sensor needs to be added for air temp so you might as well use the GM
> since MS is already
> calibrated for it and it is a low thermal mass sensor. (which could be
> important for a turbo engine
> and much less so for an NA engine)
> 
> So, Ben! What happened to your MK II 16V?
> 
> Dan
> 
> ----- Original Message -----
> From: "Benjamin Harder" <vwtype53@yahoo.com>
> To: <scirocco-l@scirocco.org>
> Sent: Saturday, January 31, 2004 11:27 AM
> Subject: Re: Megasquirt: sensor files
> 
> 
> >
> > --- Brian McGarvey <brianm@earendel.org> wrote:
> > > Has anybody done the VW sensors? Or do I have to do them or get the GM
> > > ones from the junkyard.
> > >
> >
> >  Yeah, so if Dan says the VW sensors aren't accurate enough, then
> > would the best option be to get GM sensors?  Obviously the GM sensors
> > require no mods to use with the MS... so the real challenge is how
> > to actually USE the GM sensors?  How do you fit a GM coolant temp
> > sensor into the head of a VW 16v?  Make a custom adapter?
> > I'll be doing this soon enough too... so what might the *BEST*
> > solution be here?
> >
> >
> > =====
> > Benjamin Harder
> > 1980 Scirocco 2.0 16v
> > 1993 Passat GLX
> >
> > http://www.geocities.com/vwtype53/
> >


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