Megasquirt: sensor files

[jdbubb at ix.netcom.com (Dan Bubb)]

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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