Where you mount your moto map sensor
05-06-2008, 02:17 PM
#11
3.0 BAR
Join Date: Apr 2005
Posts: 6,036
Re: Where you mount your moto map sensor
Originally Posted by fe3tcourier
I'm pretty sure that the outside of the package needs to be exposed to atmospheric pressure to operate correctly. Could be wrong though. Wait, no, I'm right :
I *think* sealing that chamber could cause it to be inaccurate, but I'm probably just being paranoid.
Obviously it has a vacuum reference, but there could be offsets caused by pressures on the case. I know for a fact that if you say tighten the screws that hold them too much you will create wrong readings.
Just a thought before you bury one in epoxy or something.
I assume you guys are talking about the SMD type ones?
Fred.
I *think* sealing that chamber could cause it to be inaccurate, but I'm probably just being paranoid.
Obviously it has a vacuum reference, but there could be offsets caused by pressures on the case. I know for a fact that if you say tighten the screws that hold them too much you will create wrong readings.
Just a thought before you bury one in epoxy or something.
I assume you guys are talking about the SMD type ones?
Fred.
05-07-2008, 08:54 PM
#13
1.5 BAR
Join Date: Mar 2005
Posts: 723
Re: Where you mount your moto map sensor
Your history also lists you as the biggest whiner in teh whole world, so... 
Freescale sensors (all rights sold to them in 2006) need that P1 hole/port (depending on the package type) exposed to air. The readings actually can be skewed if the case is distorted, since the way they work is measuring how much that 'die' flexes. Cementing it in epoxy in the sealed OEM housing will not get you any usable readings, since the epoxy and case are too rigid. Also they have gauge (atmosphere vs input) and differential (input 1 vs input 2) sensors, which won't work on cars.
You can use any sort of small case, as long as it is totally sealed (besides the vacuum port) and can hold hold the boost level you plan on running. ---- you could even use a condom and a rubber band... :1
Freescale sensors (all rights sold to them in 2006) need that P1 hole/port (depending on the package type) exposed to air. The readings actually can be skewed if the case is distorted, since the way they work is measuring how much that 'die' flexes. Cementing it in epoxy in the sealed OEM housing will not get you any usable readings, since the epoxy and case are too rigid. Also they have gauge (atmosphere vs input) and differential (input 1 vs input 2) sensors, which won't work on cars.
You can use any sort of small case, as long as it is totally sealed (besides the vacuum port) and can hold hold the boost level you plan on running. ---- you could even use a condom and a rubber band... :1
05-08-2008, 02:01 AM
#15
0.0 BAR
Join Date: Feb 2003
Posts: 0
Re: Where you mount your moto map sensor
Originally Posted by MADMAX
Prove it nignog.
I'm fairly sure Speed Phreak and Minor Threat were aware of it at the time. I kept it mostly on the DL because I didn't want the idea to get out while I was making money at the streetraces.
05-08-2008, 02:11 AM
#17
0.0 BAR
Join Date: Feb 2003
Posts: 0
Re: Where you mount your moto map sensor
Also, pgmfi.org will vouch for that: http://forum.pgmfi.org/viewtopic.php...ilit=street%2A
05-08-2008, 04:07 AM
#18
0.0 BAR
Join Date: May 2005
Posts: 0
Re: Where you mount your moto map sensor
Originally Posted by Joseph Davis
Also, pgmfi.org will vouch for that: http://forum.pgmfi.org/viewtopic.php...ilit=street%2A
All hail JD, oh creator of the "stock" MAP sensor.
Definitely never saw that thread on PGMFI though.
05-12-2008, 12:11 PM
#20
1.5 BAR
Join Date: Jul 2007
Posts: 752
Re: Where you mount your moto map sensor
Originally Posted by HiProfile
The readings actually can be skewed if the case is distorted, since the way they work is measuring how much that 'die' flexes. Cementing it in epoxy in the sealed OEM housing will not get you any usable readings, since the epoxy and case are too rigid.
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