Boost gauge off at elevation - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

gdrider77 · 09-24-2013, 07:00 PM

So was just thinking about this, i am in denver, so elevation of 5280. Would my AEM boost gauge be off a couple psi due to the elevation?

Anyone else at elevation show their gauge being 2 psi less? I was originally thinking i have the wrong actuator, but now i am thinking that maybe my 8psi actuator is only reading at 6psi due to elevation.

Can i check with ecutek logs somehow to see the "trueboost"? Or possibly with torque?

Just trying to iron out some issues.

Thoughts?

448hpsti · 09-24-2013, 10:09 PM

Boost gauge will not be off, but to be sure use the bar reading ecutek puts out

Sportsguy83 · 09-24-2013, 10:13 PM

Quote:

Originally Posted by gdrider77

Can i check with ecutek logs somehow to see the "trueboost"? Or possibly with torque?

Just trying to iron out some issues.

Thoughts?

ECUtek and Torque will display the same MAP sensor reading. You can try either against your Boost gauge.

Sellout · 09-24-2013, 11:55 PM

Atmospheric pressure at sea level is about 14.7 psi.

Atmospheric pressure at Denver International airport is about 12 psi.

The wastegate in a turbo system raises boost pressure above local atmospheric pressure. So 8 psi boost at sea level is going to be higher absolute pressure than 8 psi in Denver.

If your boost gauge is calibrated to read 0 when it's reading atmospheric pressure in Denver, then you should see 8 psi on your gauge at full boost. If it's calibrated to read 0 at sea level, then you should see it hanging around 4-5" vacuum with your car off, and it might get up to 6 psi at full boost.

King Tut · 09-25-2013, 11:55 AM

Quote:

Originally Posted by gdrider77

So was just thinking about this, i am in denver, so elevation of 5280. Would my AEM boost gauge be off a couple psi due to the elevation?

Anyone else at elevation show their gauge being 2 psi less? I was originally thinking i have the wrong actuator, but now i am thinking that maybe my 8psi actuator is only reading at 6psi due to elevation.

Can i check with ecutek logs somehow to see the "trueboost"? Or possibly with torque?

Just trying to iron out some issues.

Thoughts?

The AEM boost gauge is the only one I know of that calibrates itself every time you turn the car on to the local atmosphere. My AEM failsafe doesn't do it, but in my buddies STi for his AEM Truboost gauge to read accurately you have to turn the car on but not start it and allow it to do it's calibration to zero boost/vacuum and then start the car. What does your gauge show as vacuum with the A/C off and at idle?

jamesm · 09-25-2013, 01:34 PM

my prosport gauge said it came calibrated for 1000ft elevation, a compromise i guess. seemed weird to me at the time, but it seems to read perfectly well in line with the map.

King Tut · 09-25-2013, 02:17 PM

Quote:

Originally Posted by jamesm

my prosport gauge said it came calibrated for 1000ft elevation, a compromise i guess. seemed weird to me at the time, but it seems to read perfectly well in line with the map.

I think most boost gauges are setup this way. They are set from the factory with some elevation to be zero boost/vacuum.

fenton · 09-25-2013, 02:32 PM

Its also harder to boost at higher altitudes.

When i had my STI at +3500 feet target redline boost was suposse to be 13.5psi but i only ever saw 11.8 to 12.2.

09-24-2013, 07:00 PM	#1
gdrider77 Senior Member Join Date: Oct 2012 Drives: Subaru BRZ Limited Location: Denver, CO Posts: 623 Thanks: 243 Thanked 263 Times in 157 Posts Mentioned: 19 Post(s) Tagged: 2 Thread(s)	Boost gauge off at elevation So was just thinking about this, i am in denver, so elevation of 5280. Would my AEM boost gauge be off a couple psi due to the elevation? Anyone else at elevation show their gauge being 2 psi less? I was originally thinking i have the wrong actuator, but now i am thinking that maybe my 8psi actuator is only reading at 6psi due to elevation. Can i check with ecutek logs somehow to see the "trueboost"? Or possibly with torque? Just trying to iron out some issues. Thoughts? __________________

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09-24-2013, 10:09 PM	#2
448hpsti In Test:Oil Fed SC Join Date: May 2013 Drives: Vortech Prototype Test Car Location: Hotter than where you are Posts: 355 Thanks: 156 Thanked 142 Times in 89 Posts Mentioned: 7 Post(s) Tagged: 0 Thread(s)	Boost gauge will not be off, but to be sure use the bar reading ecutek puts out

09-24-2013, 11:55 PM	#4
Sellout Mr. Cranky Pants Join Date: Apr 2013 Drives: 2013 Argento FR-S Location: San Diego Posts: 449 Thanks: 76 Thanked 147 Times in 103 Posts Mentioned: 1 Post(s) Tagged: 0 Thread(s)	Atmospheric pressure at sea level is about 14.7 psi. Atmospheric pressure at Denver International airport is about 12 psi. The wastegate in a turbo system raises boost pressure above local atmospheric pressure. So 8 psi boost at sea level is going to be higher absolute pressure than 8 psi in Denver. If your boost gauge is calibrated to read 0 when it's reading atmospheric pressure in Denver, then you should see 8 psi on your gauge at full boost. If it's calibrated to read 0 at sea level, then you should see it hanging around 4-5" vacuum with your car off, and it might get up to 6 psi at full boost.

09-25-2013, 01:34 PM	#6
jamesm Banned Join Date: Mar 2013 Drives: 2013 FR-S Location: Orlando, FL Posts: 2,929 Thanks: 1,166 Thanked 2,293 Times in 1,180 Posts Mentioned: 313 Post(s) Tagged: 4 Thread(s)	my prosport gauge said it came calibrated for 1000ft elevation, a compromise i guess. seemed weird to me at the time, but it seems to read perfectly well in line with the map.

09-25-2013, 02:32 PM	#8
fenton Senior Member Join Date: May 2012 Drives: 2013 FR-S Location: Calgary Posts: 2,086 Thanks: 526 Thanked 1,614 Times in 726 Posts Mentioned: 120 Post(s) Tagged: 0 Thread(s)	Its also harder to boost at higher altitudes. When i had my STI at +3500 feet target redline boost was suposse to be 13.5psi but i only ever saw 11.8 to 12.2.

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