M800 and Baro sensor - little help?
Posted: Sun Jun 16, 2019 11:50 amHi,
First time posting - seems almost everything I'd thought I wanted to ask on the forum has already been answered - years ago, mostly - if you search enough
Until now...
Digging into my M800 install, I've discovered an unconfigured Delco MAP sensor intended for sensing barometric pressure (clues being that it's labeled "BARO" and the attached hose is deliberately open to atmo). It's already pinned up, so all I need to do is tell the M800 a) its there and b) how to use it....
To clarify, I'm not going to Pikes Peak, and will mostly drive around at the same elevation I'll be tuning the car at. However, there are some 3-4000 ft mountain passes around here (cue for Colorado folks to snicker I guess
) - and it seems to me that this is probably a significant enough pressure differential that utilizing the sensor that's already there is a no-brainer.
Can't for the life of me figure out what model sensor it actually is ("9576-C7" and ">PBT-GF30<" are all I can see - and had to use an endoscope to get that) - but clearly a Delco; perusing the specs for the 1/2/3 bar sensors, I should be able to power up and see what voltage the Motec reads for it (as all the sensors output different voltages @ 100kpa depending on type). As someone else made the harness, I'm not trusting the color of the Weatherpack/Superseal connector to tell me anything...
So, OK, that part seems easy enough.
What I'm confused about, however, is how best to use this input. Car is an aircooled 911 turbo, Motec driving boost control - and is currently configured to use "MAP" only.
I noted the option to use "MAP / BARO" - which I had thought would be perfect/Just Work - until I read a long and technical thread here (that sometimes whooshed over my head, bit like an aeroplane) about how "MAP/BARO" isn't necessarily best or correct for forced induction...
So, is the MAP/BARO setting "close enough" for non-motorsport use - eg public roads, where boost for any significant period is a "go to jail, go directly to jail" scenario, or is there a better way to do this?
All I really want is for the tune to compensate for altitude as/if necessary; not like I envisage charging along at full target boost for minutes at a time...
Any advice/help appreciated - thanks!
First time posting - seems almost everything I'd thought I wanted to ask on the forum has already been answered - years ago, mostly - if you search enough
Until now...
Digging into my M800 install, I've discovered an unconfigured Delco MAP sensor intended for sensing barometric pressure (clues being that it's labeled "BARO" and the attached hose is deliberately open to atmo). It's already pinned up, so all I need to do is tell the M800 a) its there and b) how to use it....
To clarify, I'm not going to Pikes Peak, and will mostly drive around at the same elevation I'll be tuning the car at. However, there are some 3-4000 ft mountain passes around here (cue for Colorado folks to snicker I guess
) - and it seems to me that this is probably a significant enough pressure differential that utilizing the sensor that's already there is a no-brainer.Can't for the life of me figure out what model sensor it actually is ("9576-C7" and ">PBT-GF30<" are all I can see - and had to use an endoscope to get that) - but clearly a Delco; perusing the specs for the 1/2/3 bar sensors, I should be able to power up and see what voltage the Motec reads for it (as all the sensors output different voltages @ 100kpa depending on type). As someone else made the harness, I'm not trusting the color of the Weatherpack/Superseal connector to tell me anything...
So, OK, that part seems easy enough.
What I'm confused about, however, is how best to use this input. Car is an aircooled 911 turbo, Motec driving boost control - and is currently configured to use "MAP" only.
I noted the option to use "MAP / BARO" - which I had thought would be perfect/Just Work - until I read a long and technical thread here (that sometimes whooshed over my head, bit like an aeroplane) about how "MAP/BARO" isn't necessarily best or correct for forced induction...
So, is the MAP/BARO setting "close enough" for non-motorsport use - eg public roads, where boost for any significant period is a "go to jail, go directly to jail" scenario, or is there a better way to do this?
All I really want is for the tune to compensate for altitude as/if necessary; not like I envisage charging along at full target boost for minutes at a time...
Any advice/help appreciated - thanks!