[Diy_efi] Source for inexpensive fuel/oil pressure sensors?

[David Allen]

  Yeah, the good info is what sells them.  Each sensor comes with a 
datasheet packaged with it.  The datasheet even lists the Metripack 
connector that mates to the transducer.
One more reason I hate mechanical senders- I thought I had lost the engine 
in my Nova, but it was just a bad oil pressure sender.  All the nichrome 
wire had gotten untangled in the housing and the arm that moved against it 
was no longer making good contact.  It would show some pressure but at 
higher pressures it would fluctuate and fall, just like a damaged engine 
with excessive bearing clearances loosing pressure at high RPM!!!
  I've got a hydraulic quick-disconnect test-port on the fuel pressure 
system on my turbo car.  I can snap one of these transducers onto this port 
and plug it into my TE datalogger for making sure I'm not dropping pressure 
under boost or anything.  Plus it is accurate for setting the base fuel 
pressure.
  Thanks,
David



> David,
>
> Great info on the OEM sensors.  I didn't know they were that crappy (tech
> term).  I looked at the link you gave.  Nice site, they actually give good
> info on the products.
>
> Thanks,
>
> Dan Nicoson
>
> -----Original Message-----
> From: diy_efi-bounces at diy-efi.org [mailto:diy_efi-bounces at diy-efi.org]On
> Behalf Of David Allen
> Sent: Wednesday, December 27, 2006 4:19 PM
> To: diy_efi at diy-efi.org
> Subject: Re: [Diy_efi] Source for inexpensive fuel/oil pressure sensors?
>
>  I 've used a "sender" for a transducer before and it worked. But only
> after I carefully logged the resistance versus pressure curve and 
> programmed
> a PIC to interpolate this table into a linear "transducer-like" output.
>  Still cost less than a real transducer but what a PITA just to save a few
> $.  The curve on these elcheapo senders is horrible. Repeatability sucks,
> and they degrade over time.  The sensing element is a bourdon tube with a
> copper "arm" rubbing on nichrome wire.  It wears noticabley in a few 
> hundred
> hours of use.
>  The following company supplies the OEM I work for with transducers that
> are not too bad expensive and are a very nice piece. We use the 300 series
> in a pressure/ vac; 100 PSIa, 150PSIa, 1000PSIa and 10,000 PSIa versions.
> I've 'copped' a couple used ones and have great success datalogging with
> them while tuning my engine.
>  They even sell online.
> http://www.meas-spec.com/myMeas/default/index.asp
>  Hope this saves you some time!
> David
>
>
>
> ----- Original Message -----
> From: "Daniel Nicoson" <A6intruder at myo-p.com>
> To: <diy_efi at diy-efi.org>
> Sent: Wednesday, December 27, 2006 3:08 PM
> Subject: RE: [Diy_efi] Source for inexpensive fuel/oil pressure sensors?
>
>
>>I think the oil pressure "sender" on my Mustang costs $6.00 at NAPA.  It's
>> really just a variable resistor.  I'm not sure what the response curve is
>> but it shouldn't be too hard to figure out if you have a pressure gauge
>> and
>> a pressure source.  Of course your control circuit would have to 
>> interpret
>> this variable resistance to be of use.
>>
>> Dan Nicoson
>>
>> -----Original Message-----
>> From: diy_efi-bounces at diy-efi.org [mailto:diy_efi-bounces at diy-efi.org]On
>> Behalf Of Geddes, Brian J
>> Sent: Wednesday, December 27, 2006 3:59 PM
>> To: diy_efi at diy-efi.org
>> Subject: [Diy_efi] Source for inexpensive fuel/oil pressure sensors?
>>
>> Hey all -
>>
>> I'm looking for a source for inexpensive pressure transducers.  I've
>> seen lots in the $100-$150 range, but I'm willing to bet that they can
>> be had for significantly cheaper.  :)
>>
>> 1/8 or 1/4 NPT fitting, 5VDC (or 12VDC) power, 0-5 VDC output.  Need to
>> tolerate oil/fuel.  100 or 150 PSI would be perfect.
>>
>> Any ideas?
>>
>> Thanks,
>> - Brian Geddes
>> _______________________________________________
>> Diy_efi mailing list
>> Diy_efi at diy-efi.org
>> Subscribe: http://lists.diy-efi.org/mailman/listinfo/diy_efi
>> Main WWW page:  http://www.diy-efi.org/diy_efi
>>
>> _______________________________________________
>> Diy_efi mailing list
>> Diy_efi at diy-efi.org
>> Subscribe: http://lists.diy-efi.org/mailman/listinfo/diy_efi
>> Main WWW page:  http://www.diy-efi.org/diy_efi
>>
>
> _______________________________________________
> Diy_efi mailing list
> Diy_efi at diy-efi.org
> Subscribe: http://lists.diy-efi.org/mailman/listinfo/diy_efi
> Main WWW page:  http://www.diy-efi.org/diy_efi
>
> _______________________________________________
> Diy_efi mailing list
> Diy_efi at diy-efi.org
> Subscribe: http://lists.diy-efi.org/mailman/listinfo/diy_efi
> Main WWW page:  http://www.diy-efi.org/diy_efi
>